Umeå University's logo

umu.sePublications
Change search
Refine search result
1 - 46 of 46
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1. Abdulla, Maysaa
    et al.
    Hollander, Peter
    Pandzic, Tatjana
    Mansouri, Larry
    Ednersson, Susanne Bram
    Andersson, Per-Ola
    Hultdin, Magnus
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Fors, Maja
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Erlanson, Martin
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Oncology.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Petersen, Helga Munch
    Asmar, Fazila
    Gronbaek, Kirsten
    Enblad, Gunilla
    Cavelier, Lucia
    Rosenquist, Richard
    Amini, Rose-Marie
    Cell-of-origin determined by both gene expression profiling and immunohistochemistry is the strongest predictor of survival in patients with diffuse large B-cell lymphoma2020In: American Journal of Hematology, ISSN 0361-8609, E-ISSN 1096-8652, Vol. 95, no 1, p. 57-67Article in journal (Refereed)
    Abstract [en]

    The tumor cells in diffuse large B-cell lymphomas (DLBCL) are considered to originate from germinal center derived B-cells (GCB) or activated B-cells (ABC). Gene expression profiling (GEP) is preferably used to determine the cell of origin (COO). However, GEP is not widely applied in clinical practice and consequently, several algorithms based on immunohistochemistry (IHC) have been developed. Our aim was to evaluate the concordance of COO assignment between the Lymph2Cx GEP assay and the IHC-based Hans algorithm, to decide which model is the best survival predictor. Both GEP and IHC were performed in 359 homogenously treated Swedish and Danish DLBCL patients, in a retrospective multicenter cohort. The overall concordance between GEP and IHC algorithm was 72%; GEP classified 85% of cases assigned as GCB by IHC, as GCB, while 58% classified as non-GCB by IHC, were categorized as ABC by GEP. There were significant survival differences (overall survival and progression-free survival) if cases were classified by GEP, whereas if cases were categorized by IHC only progression-free survival differed significantly. Importantly, patients assigned as non-GCB/ABC both by IHC and GEP had the worst prognosis, which was also significant in multivariate analyses. Double expression of MYC and BCL2 was more common in ABC cases and was associated with a dismal outcome. In conclusion, to determine COO both by IHC and GEP is the strongest outcome predictor to identify DLBCL patients with the worst outcome.

    Download full text (pdf)
    fulltext
  • 2.
    Andersson Evelönn, Emma
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Köhn, Linda
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology. Umeå University, Faculty of Science and Technology, Department of Mathematics and Mathematical Statistics.
    Ljungberg, Börje
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Urology and Andrology.
    Roos, Göran
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    DNA methylation status defines clinicopathological parameters including survival for patients with clear cell renal cell carcinoma (ccRCC)2016In: Tumor Biology, ISSN 1010-4283, E-ISSN 1423-0380, Vol. 37, no 8, p. 10219-10228Article in journal (Refereed)
    Abstract [en]

    Epigenetic alterations in the methylome have been associated with tumor development and progression in renal cell carcinoma (RCC). In this study, 45 tumor samples, 12 tumor-free kidney cortex tissues, and 24 peripheral blood samples from patients with clear cell RCC (ccRCC) were analyzed by genome-wide promoter-directed methylation arrays and related to clinicopathological parameters. Unsupervised hierarchical clustering separated the tumors into two distinct methylation groups (clusters A and B), where cluster B had higher average methylation and increased number of hypermethylated CpG sites (CpGs). Furthermore, tumors in cluster B had, compared with cluster A, a larger tumor diameter (p = 0.033), a higher morphologic grade (p < 0.001), a higher tumor-node-metastasis (TNM) stage (p < 0.001), and a worse prognosis (p = 0.005). Higher TNM stage was correlated to an increase in average methylation level (p = 0.003) and number of hypermethylated CpGs (p = 0.003), whereas a number of hypomethylated CpGs were mainly unchanged. However, the predicted age of the tumors based on methylation profile did not correlate with TNM stage, morphological grade, or methylation cluster. Differently methylated (DM) genes (n = 840) in ccRCC samples compared with tumor-free kidney cortex samples were predominantly hypermethylated and a high proportion were identified as polycomb target genes. The DM genes were overrepresented by transcription factors, ligands, and receptors, indicating functional alterations of significance for ccRCC progression. To conclude, increased number of hypermethylated genes was associated with increased TNM stage of the tumors. DNA methylation classification of ccRCC tumor samples at diagnosis can serve as a clinically applicable prognostic marker in ccRCC.

  • 3.
    Andersson Evelönn, Emma
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Haider, Zahra
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Köhn, Linda
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Oncology.
    Ljungberg, Börje
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Urology and Andrology.
    Roos, Göran
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    DNA methylation associates with survival in non-metastatic clear cell renal cell carcinoma2019In: BMC Cancer, ISSN 1471-2407, E-ISSN 1471-2407, Vol. 19, article id 65Article in journal (Refereed)
    Abstract [en]

    Background: Clear cell renal cell carcinoma (ccRCC) is the most common subtype among renal cancer and is associated with poor prognosis if metastasized. Up to one third of patients with local disease at diagnosis will develop metastasis after nephrectomy, and there is a need for new molecular markers to identify patients with high risk of tumor progression. In the present study, we performed genome-wide promoter DNA methylation analysis at diagnosis to identify DNA methylation profiles associated with risk for progress.

    Method: Diagnostic tissue samples from 115 ccRCC patients were analysed by Illumina HumanMethylation450K arrays and methylation status of 155,931 promoter associated CpGs were related to genetic aberrations, gene expression and clinicopathological parameters.

    Results: The ccRCC samples separated into two clusters (cluster A/B) based on genome-wide promoter methylation status. The samples in these clusters differed in tumor diameter (p < 0.001), TNM stage (p < 0.001), morphological grade (p < 0.001), and patients outcome (5 year cancer specific survival (pCSS5yr) p < 0.001 and cumulative incidence of progress (pCIP5yr) p < 0.001. An integrated genomic and epigenomic analysis in the ccRCCs, revealed significant correlations between the total number of genetic aberrations and total number of hypermethylated CpGs (R = 0.435, p < 0.001), and predicted mitotic age (R = 0.407, p < 0.001). We identified a promoter methylation classifier (PMC) panel consisting of 172 differently methylated CpGs accompanying progress of disease. Classifying non-metastatic patients using the PMC panel showed that PMC high tumors had a worse prognosis compared with the PMC low tumors (pCIP5yr 38% vs. 8%, p = 0.001), which was confirmed in non-metastatic ccRCCs in the publically available TCGA-KIRC dataset (pCIP5yr 39% vs. 16%, p < 0.001).

    Conclusion: DNA methylation analysis at diagnosis in ccRCC has the potential to improve outcome-prediction in non-metastatic patients at diagnosis.

    Download full text (pdf)
    fulltext
  • 4.
    Andersson, Ulrika
    et al.
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Oncology.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Dahlin, Anna
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Oncology.
    Brannstrom, Thomas
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Roos, Göran
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Melin, B. S.
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Oncology.
    Telomere length, allergies and risk of Glioma2017In: Neuro-Oncology, ISSN 1522-8517, E-ISSN 1523-5866, Vol. 19, no S3, p. 23-23, article id P01.03Article in journal (Refereed)
    Abstract [en]

    Background: In glioma, a malignant brain tumour with poor prognosis, the etiology is largely unkown. Rare inherited syndromes, and high doses of ionising radiation are associated with increased risk of glioma. Common genetic variants have been associated with risk of glioma, and familial glioma have been associated with genetic variants in genes functionally important in telomere regulation (e.g. RTEL, TERT and POT1). The association between telomere length and risk of cancer is complex and seems to be tumour type dependent. Patients with asthma have significantly shorter telomeres than those of control subjects, and a protective effect has been observed with an inverse association with allergies and asthma and glioma risk. 

    Methods: We investigated population based glioma case-control series (431 cases and 672 controls) from Sweden at diagnosis with a quantitative PCR method for relative leukocyte telomere length measured in blood confirming with direct measurement of the association between telomere length and risk of glioma. We also explored the relationship between, age, gender, allergies and asthma, as these are established factors associated both with telomere length and glioma.

    Results: Longer relative leukocyte telomere length was significantly associated with increased risk of glioma, adjusting for age and gender (OR=2.23, CI: 1.11–4.47). As expected, for patients with allergies there was a protective effect with an inverse association with glioma risk, adjusting for age and gender (OR=0.64, CI; 0.48–0.85). Nevertheless, when analysing specific types of allergy, eczema (OR=0.66, CI; 0.41–1.08) and water eyes (OR=0.52, CI; 0.31–0.88) appeared to be more protective against glioma, compared to asthma (OR=0.92, CI; 0.59–1.41), and respiratory symptoms (OR=1.14, CI; 0.71–1.84) which showed no protective effect against glioma. Additionally adjusting for allergies did not markedly change the OR between relative leukocyte telomere length and glioma risk, indicating that the protective effect having allergies seems not to be coupled to telomere length. Conclusions: The adverse association of longer telomere and risk of glioma displays the complexity in understanding the biological role of telomere length and risk of developing cancer.

  • 5.
    Andersson, Ulrika
    et al.
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Oncology.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Dahlin, Anna M.
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Oncology.
    Wibom, Carl
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Oncology.
    Johansson, Gunnar
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Oncology.
    Bondy, Melissa L.
    Melin, Beatrice S.
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Oncology.
    The association between longer relative leukocyte telomere length and risk of glioma is independent of the potentially confounding factors allergy, BMI, and smoking2019In: Cancer Causes and Control, ISSN 0957-5243, E-ISSN 1573-7225, Vol. 30, no 2, p. 177-185Article in journal (Refereed)
    Abstract [en]

    Purpose: Previous studies have suggested an association between relative leukocyte telomere length (rLTL) and glioma risk. This association may be influenced by several factors, including allergies, BMI, and smoking. Previous studies have shown that individuals with asthma and allergy have shortened relative telomere length, and decreased risk of glioma. Though, the details and the interplay between rLTL, asthma and allergies, and glioma molecular phenotype is largely unknown. Methods: rLTL was measured by qPCR in a Swedish population-based glioma case–control cohort (421 cases and 671 controls). rLTL was related to glioma risk and health parameters associated with asthma and allergy, as well as molecular events in glioma including IDH1 mutation, 1p/19q co-deletion, and EGFR amplification. Results: Longer rLTL was associated with increased risk of glioma (OR = 1.16; 95% CI 1.02–1.31). Similar to previous reports, there was an inverse association between allergy and glioma risk. Specific, allergy symptoms including watery eyes was most strongly associated with glioma risk. High body mass index (BMI) a year prior diagnosis was significantly protective against glioma in our population. Adjusting for allergy, asthma, BMI, and smoking did not markedly change the association between longer rLTL and glioma risk. rLTL among cases was not associated with IDH1 mutation, 1p/19q co-deletion, or EGFR amplification, after adjusting for age at diagnosis and sex. Conclusions: In this Swedish glioma case–control cohort, we identified that long rLTL increases the risk of glioma, an association not confounded by allergy, BMI, or smoking. This highlights the complex interplay of the immune system, rLTL and cancer risk.

    Download full text (pdf)
    fulltext
  • 6.
    Andersson-Evelönn, Emma
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Vidman, Linda
    Umeå University, Faculty of Science and Technology, Department of Mathematics and Mathematical Statistics.
    Källberg, David
    Umeå University, Faculty of Science and Technology, Department of Mathematics and Mathematical Statistics. Umeå University, Faculty of Social Sciences, Umeå School of Business and Economics (USBE), Statistics.
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Liu, Xijia
    Umeå University, Faculty of Science and Technology, Department of Mathematics and Mathematical Statistics.
    Ljungberg, Börje
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Urology and Andrology.
    Hultdin, Magnus
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology. Umeå University, Faculty of Medicine, Department of Clinical Microbiology.
    Rydén, Patrik
    Umeå University, Faculty of Science and Technology, Department of Mathematics and Mathematical Statistics.
    Combining epigenetic and clinicopathological variables improves prognostic prediction in clear cell Renal Cell CarcinomaManuscript (preprint) (Other academic)
  • 7.
    Andersson-Evelönn, Emma
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Vidman, Linda
    Umeå University, Faculty of Science and Technology, Department of Mathematics and Mathematical Statistics.
    Källberg, David
    Umeå University, Faculty of Science and Technology, Department of Mathematics and Mathematical Statistics. Umeå University, Faculty of Social Sciences, Umeå School of Business and Economics (USBE), Statistics.
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Liu, Xijia
    Umeå University, Faculty of Science and Technology, Department of Mathematics and Mathematical Statistics.
    Ljungberg, Börje
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Urology and Andrology.
    Hultdin, Magnus
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Rydén, Patrik
    Umeå University, Faculty of Science and Technology, Department of Mathematics and Mathematical Statistics.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology. Umeå University, Faculty of Medicine, Department of Clinical Microbiology.
    Combining epigenetic and clinicopathological variables improves specificity in prognostic prediction in clear cell renal cell carcinoma2020In: Journal of Translational Medicine, ISSN 1479-5876, E-ISSN 1479-5876, Vol. 18, no 1, article id 435Article in journal (Refereed)
    Abstract [en]

    Background: Metastasized clear cell renal cell carcinoma (ccRCC) is associated with a poor prognosis. Almost one-third of patients with non-metastatic tumors at diagnosis will later progress with metastatic disease. These patients need to be identified already at diagnosis, to undertake closer follow up and/or adjuvant treatment. Today, clinicopathological variables are used to risk classify patients, but molecular biomarkers are needed to improve risk classification to identify the high-risk patients which will benefit most from modern adjuvant therapies. Interestingly, DNA methylation profiling has emerged as a promising prognostic biomarker in ccRCC. This study aimed to derive a model for prediction of tumor progression after nephrectomy in non-metastatic ccRCC by combining DNA methylation profiling with clinicopathological variables.

    Methods: A novel cluster analysis approach (Directed Cluster Analysis) was used to identify molecular biomarkers from genome-wide methylation array data. These novel DNA methylation biomarkers, together with previously identified CpG-site biomarkers and clinicopathological variables, were used to derive predictive classifiers for tumor progression.

    Results: The “triple classifier” which included both novel and previously identified DNA methylation biomarkers together with clinicopathological variables predicted tumor progression more accurately than the currently used Mayo scoring system, by increasing the specificity from 50% in Mayo to 64% in our triple classifier at 85% fixed sensitivity. The cumulative incidence of progress (pCIP5yr) was 7.5% in low-risk vs 44.7% in high-risk in M0 patients classified by the triple classifier at diagnosis.

    Conclusions: The triple classifier panel that combines clinicopathological variables with genome-wide methylation data has the potential to improve specificity in prognosis prediction for patients with non-metastatic ccRCC.

    Download full text (pdf)
    fulltext
  • 8.
    Borssen, Magnus
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Palmqvist, Lars
    Karrman, Kristina
    Abrahamsson, Jonas
    Behrendtz, Mikael
    Heldrup, Jesper
    Forestier, Erik
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Roos, Göran
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Promoter DNA methylation pattern identifies prognostic subgroups in childhood T-cell acute lymphoblastic leukemia2013In: PLOS ONE, E-ISSN 1932-6203, Vol. 8, no 6, p. e65373-Article in journal (Refereed)
    Abstract [en]

    Background: Treatment of pediatric T-cell acute lymphoblastic leukemia (T-ALL) has improved, but there is a considerable fraction of patients experiencing a poor outcome. There is a need for better prognostic markers and aberrant DNA methylation is a candidate in other malignancies, but its potential prognostic significance in T-ALL is hitherto undecided.

    Design and Methods: Genome wide promoter DNA methylation analysis was performed in pediatric T-ALL samples (n = 43) using arrays covering >27000 CpG sites. Clinical outcome was evaluated in relation to methylation status and compared with a contemporary T-ALL group not tested for methylation (n = 32).

    Results: Based on CpG island methylator phenotype (CIMP), T-ALL samples were subgrouped as CIMP+ (high methylation) and CIMP- (low methylation). CIMP- T-ALL patients had significantly worse overall and event free survival (p = 0.02 and p = 0.001, respectively) compared to CIMP+ cases. CIMP status was an independent factor for survival in multivariate analysis including age, gender and white blood cell count. Analysis of differently methylated genes in the CIMP subgroups showed an overrepresentation of transcription factors, ligands and polycomb target genes.

    Conclusions: We identified global promoter methylation profiling as being of relevance for subgrouping and prognostication of pediatric T-ALL.

    Download full text (pdf)
    fulltext
  • 9.
    Borssén, Magnus
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Haider, Zahra
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Norén-Nyström, Ulrika
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Paediatrics.
    Schmiegelow, Kjeld
    Åsberg, Ann E.
    Kanerva, Jukka
    Madsen, Hans O.
    Marquart, Hanne
    Heyman, Mats
    Hultdin, Magnus
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Roos, Göran
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Forestier, Erik
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Medical and Clinical Genetics.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology. Department of Paediatrics, University Hospital of Trondheim, Norway.
    DNA Methylation Adds Prognostic Value to Minimal Residual Disease Status in Pediatric T-Cell Acute Lymphoblastic Leukemia2016In: Pediatric Blood & Cancer, ISSN 1545-5009, E-ISSN 1545-5017, Vol. 63, no 7, p. 1185-1192Article in journal (Refereed)
    Abstract [en]

    Background. Despite increased knowledge about genetic aberrations in pediatric T-cell acute lymphoblastic leukemia (T-ALL), no clinically feasible treatment-stratifying marker exists at diagnosis. Instead patients are enrolled in intensive induction therapies with substantial side effects. In modern protocols, therapy response is monitored by minimal residual disease (MRD) analysis and used for postinduction risk group stratification. DNA methylation profiling is a candidate for subtype discrimination at diagnosis and we investigated its role as a prognostic marker in pediatric T-ALL. Procedure. Sixty-five diagnostic T-ALL samples from Nordic pediatric patients treated according to the Nordic Society of Pediatric Hematology and Oncology ALL 2008 (NOPHO ALL 2008) protocol were analyzed by HumMeth450K genome wide DNA methylation arrays. Methylation status was analyzed in relation to clinical data and early T-cell precursor (ETP) phenotype. Results. Two distinct CpG island methylator phenotype (CIMP) groups were identified. Patients with a CIMP-negative profile had an inferior response to treatment compared to CIMP-positive patients (3-year cumulative incidence of relapse (CIR3y) rate: 29% vs. 6%, P = 0.01). Most importantly, CIMP classification at diagnosis allowed subgrouping of high-risk T-ALL patients (MRD >= 0.1% at day 29) into two groups with significant differences in outcome (CIR3y rates: CIMP negative 50% vs. CIMP positive 12%; P = 0.02). These groups did not differ regarding ETP phenotype, but the CIMP-negative group was younger (P = 0.02) and had higher white blood cell count at diagnosis (P = 0.004) compared with the CIMP-positive group. Conclusions. CIMP classification at diagnosis in combination with MRD during induction therapy is a strong candidate for further risk classification and could confer important information in treatment decision making.

    Download full text (pdf)
    fulltext
  • 10.
    Borssén, Magnus
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Nordlund, Jessica
    Haider, Zahra
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Larsson, Pär
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Kanerva, Jukka
    Schmiegelow, Kjeld
    Flaegstad, Trond
    Jónsson, Ólafur Gísli
    Frost, Britt-Marie
    Palle, Josefine
    Forestier, Erik
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Medical and Clinical Genetics.
    Heyman, Mats
    Hultdin, Magnus
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Lönnerholm, Gudmar
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    DNA methylation holds prognostic information in relapsed precursor B-cell acute lymphoblastic leukemia2018In: Clinical Epigenetics, E-ISSN 1868-7083, Vol. 10, article id 31Article in journal (Refereed)
    Abstract [en]

    Background: Few biological markers are associated with survival after relapse of B-cell precursor acute lymphoblastic leukemia (BCP-ALL). In pediatric T-cell ALL, we have identified promoter-associated methylation alterations that correlate with prognosis. Here, the prognostic relevance of CpG island methylation phenotype (CIMP) classification was investigated in pediatric BCP-ALL patients.

    Methods: Six hundred and one BCP-ALL samples from Nordic pediatric patients (age 1-18) were CIMP classified at initial diagnosis and analyzed in relation to clinical data.

    Results: Among the 137 patients that later relapsed, patients with a CIMP-profile (n = 42) at initial diagnosis had an inferior overall survival (pOS(5years) 33%) compared to CIMP+ patients (n = 95, pOS(5years) 65%) (p = 0.001), which remained significant in a Cox proportional hazards model including previously defined risk factors.

    Conclusion: CIMP classification is a strong candidate for improved risk stratification of relapsed BCP-ALL.

    Download full text (pdf)
    fulltext
  • 11.
    Bovinder Ylitalo, Erik
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Thysell, Elin
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Brattsand, Maria
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Jernberg, Emma
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Crnalic, Sead
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Orthopaedics.
    Widmark, Anders
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Oncology.
    Hultdin, Magnus
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Bergh, Anders
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology. Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Wikström, Pernilla
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    A novel DNA methylation signature is associated with androgen receptor activity and patient prognosis in bone metastatic prostate cancer2021In: Clinical Epigenetics, E-ISSN 1868-7083, Vol. 13, no 1, article id 133Article in journal (Refereed)
    Abstract [en]

    Background: Patients with metastatic prostate cancer (PC) are treated with androgen deprivation therapy (ADT) that initially reduces metastasis growth, but after some time lethal castration-resistant PC (CRPC) develops. A better understanding of the tumor biology in bone metastases is needed to guide further treatment developments. Subgroups of PC bone metastases based on transcriptome profiling have been previously identified by our research team, and specifically, heterogeneities related to androgen receptor (AR) activity have been described. Epigenetic alterations during PC progression remain elusive and this study aims to explore promoter gene methylation signatures in relation to gene expression and tumor AR activity.

    Materials and methods: Genome-wide promoter-associated CpG methylation signatures of a total of 94 tumor samples, including paired non-malignant and malignant primary tumor areas originating from radical prostatectomy samples (n = 12), and bone metastasis samples of separate patients with hormone-naive (n = 14), short-term castrated (n = 4) or CRPC (n = 52) disease were analyzed using the Infinium Methylation EPIC arrays, along with gene expression analysis by Illumina Bead Chip arrays (n = 90). AR activity was defined from expression levels of genes associated with canonical AR activity.

    Results: Integrated epigenome and transcriptome analysis identified pronounced hypermethylation in malignant compared to non-malignant areas of localized prostate tumors. Metastases showed an overall hypomethylation in relation to primary PC, including CpGs in the AR promoter accompanied with induction of AR mRNA levels. We identified a Methylation Classifier for Androgen receptor activity (MCA) signature, which separated metastases into two clusters (MCA positive/negative) related to tumor characteristics and patient prognosis. The MCA positive metastases showed low methylation levels of genes associated with canonical AR signaling and patients had a more favorable prognosis after ADT. In contrast, MCA negative patients had low AR activity associated with hypermethylation of AR-associated genes, and a worse prognosis after ADT.

    Conclusions: A promoter methylation signature classifies PC bone metastases into two groups and predicts tumor AR activity and patient prognosis after ADT. The explanation for the methylation diversities observed during PC progression and their biological and clinical relevance need further exploration.

    Download full text (pdf)
    fulltext
  • 12.
    Bovinder Ylitalo, Erik
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Thysell, Elin
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences.
    Jernberg, Emma
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Crnalic, Sead
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Orthopaedics.
    Widmark, Anders
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Oncology.
    Bergh, Anders
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Wikström, Pernilla
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Integrated DNA methylation and gene expression analysis of molecular heterogeneity in prostate cancer bone metastasisManuscript (preprint) (Other academic)
  • 13.
    Carlund, Olivia
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Norberg, Anna
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Medical and Clinical Genetics.
    Osterman, Pia
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology. Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Hultdin, Magnus
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    DNA methylation variations and epigenetic aging in telomere biology disorders2023In: Scientific Reports, E-ISSN 2045-2322, Vol. 13, no 1, article id 7955Article in journal (Refereed)
    Abstract [en]

    Telomere Biology Disorders (TBDs) are characterized by mutations in telomere-related genes leading to short telomeres and premature aging but with no strict correlation between telomere length and disease severity. Epigenetic alterations are also markers of aging and we aimed to evaluate whether DNA methylation (DNAm) could be part of the pathogenesis of TBDs. In blood from 35 TBD cases, genome-wide DNAm were analyzed and the cases were grouped based on relative telomere length (RTL): short (S), with RTL close to normal controls, and extremely short (ES). TBD cases had increased epigenetic age and DNAm alterations were most prominent in the ES-RTL group. Thus, the differentially methylated (DM) CpG sites could be markers of short telomeres but could also be one of the mechanisms contributing to disease phenotype since DNAm alterations were observed in symptomatic, but not asymptomatic, cases with S-RTL. Furthermore, two or more DM-CpGs were identified in four genes previously linked to TBD or telomere length (PRDM8, SMC4, VARS, and WNT6) and in three genes that were novel in telomere biology (MAS1L, NAV2, and TM4FS1). The DM-CpGs in these genes could be markers of aging in hematological cells, but they could also be of relevance for the progression of TBD.

    Download full text (pdf)
    fulltext
  • 14.
    Degerman, Sofie
    et al.
    Umeå University, Faculty of Medicine. Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Borssen, Magnus
    Umeå University, Faculty of Medicine. Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Andersson, Emma
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Chranowska, Krystyna H.
    Department of Medical Genetics, Childrens Memorial Health institute, 04-730 Warsaw, Poland.
    Siwicki, Jan Konrad
    Department of Immunology, maria Sklodowska-Curie Memorial Cancer Centre and institute of Oncology, 02-781, Warsaw, Poland.
    Roos, Göran
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Senescence bypass and immortalization of T cell cultures are linked to stepwise DNA methylation changesManuscript (preprint) (Other academic)
  • 15.
    Degerman, Sofie
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Domellöf, Magdalena
    Umeå University, Faculty of Medicine, Department of Pharmacology and Clinical Neuroscience, Clinical Neuroscience.
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Linder, Jan
    Umeå University, Faculty of Medicine, Department of Pharmacology and Clinical Neuroscience, Clinical Neuroscience.
    Lundin, Mathias
    Umeå University, Faculty of Social Sciences, Umeå School of Business and Economics (USBE), Statistics.
    Haraldsson, Susann
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Elgh, Eva
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Psychiatry.
    Roos, Göran
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Forsgren, Lars
    Umeå University, Faculty of Medicine, Department of Pharmacology and Clinical Neuroscience, Clinical Neuroscience.
    Long Leukocyte Telomere Length at Diagnosis Is a Risk Factor for Dementia Progression in Idiopathic Parkinsonism2014In: PLOS ONE, E-ISSN 1932-6203, Vol. 9, no 12, article id e113387Article in journal (Refereed)
    Abstract [en]

    Telomere length (TL) is regarded as a marker of cellular aging due to the gradual shortening by each cell division, but is influenced by a number of factors including oxidative stress and inflammation. Parkinson's disease and atypical forms of parkinsonism occur mainly in the elderly, with oxidative stress and inflammation in afflicted cells. In this study the relationship between blood TL and prognosis of 168 patients with idiopathic parkinsonism (136 Parkinson's disease [PD], 17 Progressive Supranuclear Palsy [PSP], and 15 Multiple System Atrophy [MSA]) and 30 controls was investigated. TL and motor and cognitive performance were assessed at baseline (diagnosis) and repeatedly up to three to five years follow up. No difference in TL between controls and patients was shown at baseline, nor any significant difference in TL stability or attrition during follow up. Interestingly, a significant relationship between TL at diagnosis and cognitive phenotype at follow up in PD and PSP patients was found, with longer mean TL at diagnosis in patients that developed dementia within three years.

    Download full text (pdf)
    fulltext
  • 16.
    Degerman, Sofie
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Josefsson, Maria
    Umeå University, Faculty of Social Sciences, Centre for Demographic and Ageing Research (CEDAR).
    Nordin Adolfsson, Annelie
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Psychiatry.
    Wennstedt, Sigrid
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Haider, Zahra
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Pudas, Sara
    Umeå University, Faculty of Medicine, Umeå Centre for Functional Brain Imaging (UFBI). Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB).
    Hultdin, Magnus
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Nyberg, Lars
    Umeå University, Faculty of Medicine, Umeå Centre for Functional Brain Imaging (UFBI). Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB). Umeå University, Faculty of Medicine, Department of Radiation Sciences.
    Adolfsson, Rolf
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Psychiatry.
    Maintained memory in aging is associated with young epigenetic age2017In: Neurobiology of Aging, ISSN 0197-4580, E-ISSN 1558-1497, Vol. 55, p. 167-171Article in journal (Refereed)
    Abstract [en]

    Epigenetic alterations during aging have been proposed to contribute to decline in physical and cognitive functions, and accelerated epigenetic aging has been associated with disease and all-cause mortality later in life. In this study, we estimated epigenetic age dynamics in groups with different memory trajectories (maintained high performance, average decline, and accelerated decline) over a 15-year period. Epigenetic (DNA-methylation [DNAm]) age was assessed, and delta age (DNAm age - chronological age) was calculated in blood samples at baseline (age: 55-65 years) and 15 years later in 52 age- and gender-matched individuals from the Betula study in Sweden. A lower delta DNAm age was observed for those with maintained memory functions compared with those with average (p = 0.035) or accelerated decline (p = 0.037). Moreover, separate analyses revealed that DNAm age at follow-up, but not chronologic age, was a significant predictor of dementia (p = 0.019). Our findings suggest that young epigenetic age contributes to maintained memory in aging.

    Download full text (pdf)
    fulltext
  • 17.
    Degerman, Sofie
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Landfors, Mattias
    Umeå University, Faculty of Science and Technology, Department of Mathematics and Mathematical Statistics. Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Siwicki, Jan Konrad
    Revie, John
    Borssen, Magnus
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Evelönn, Emma
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Forestier, Erik
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Medical and Clinical Genetics.
    Chrzanowska, Krystyna H.
    Ryden, Patrik
    Umeå University, Faculty of Science and Technology, Department of Mathematics and Mathematical Statistics.
    Keith, W. Nicol
    Roos, Göran
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Immortalization of T-Cells Is Accompanied by Gradual Changes in CpG Methylation Resulting in a Profile Resembling a Subset of T-Cell Leukemias2014In: Neoplasia, ISSN 1522-8002, E-ISSN 1476-5586, Vol. 16, no 7, p. 606-615Article in journal (Refereed)
    Abstract [en]

    We have previously described gene expression changes during spontaneous immortalization of T-cells, thereby identifying cellular processes important for cell growth crisis escape and unlimited proliferation. Here, we analyze the same model to investigate the role of genome-wide methylation in the immortalization process at different time points pre-crisis and post-crisis using high-resolution arrays. We show that over time in culture there is an overall accumulation of methylation alterations, with preferential increased methylation close to transcription start sites (TSSs), islands, and shore regions. Methylation and gene expression alterations did not correlate for the majority of genes, but for the fraction that correlated, gain of methylation close to TSS was associated with decreased gene expression. Interestingly, the pattern of CpG site methylation observed in immortal T-cell cultures was similar to clinical T-cell acute lymphoblastic leukemia (T-ALL) samples classified as CpG island methylator phenotype positive. These sites were highly overrepresented by polycomb target genes and involved in developmental, cell adhesion, and cell signaling processes. The presence of non-random methylation events in in vitro immortalized T-cell cultures and diagnostic T-ALL samples indicates altered methylation of CpG sites with a possible role in malignant hematopoiesis.

    Download full text (pdf)
    fulltext
  • 18.
    Degerman, Sofie
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Siwicki, Jan Konrad
    Department of Immunology, Maria Sklodowska-Curie memorial Cancer Centre and Institute of Oncology, 02-781 Warsaw, Poland.
    Osterman, Pia
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Lafferty-Whyte, Kyle
    Centre of Oncology and Applied Pharmacology, Cancer research UK Beatson Laboratories, University of Glasgow, Scotland.
    Keith, W. Nicol
    Centre of Oncology and Applied Pharmacology, Cancer research UK Beatson Laboratories, University of Glasgow, Scotland.
    Roos, Göran
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Telomerase upregulation is a postcrisis event during senescence bypass and immortalization of two Nijmegen breakage syndrome T cell cultures2010In: Aging Cell, ISSN 1474-9718, E-ISSN 1474-9726, Vol. 9, p. 220-235Article in journal (Refereed)
    Abstract [en]

    Summary Our knowledge on immortalization and telomere biology is mainly based on genetically manipulated cells analyzed before and many population doublings post growth crisis. The general view is that growth crisis is telomere length (TL) dependent and that escape from crisis is coupled to increased expression of the telomerase reverse transcriptase (hTERT) gene, telomerase activity upregulation and TL stabilization. Here we have analyzed the process of spontaneous immortalization of human T cells, regarding pathways involved in senescence and telomerase regulation. Two Nijmegen breakage syndrome (NBS) T cell cultures (S3R and S4) showed gradual telomere attrition until a period of growth crisis followed by the outgrowth of immortalized cells. Whole genome expression analysis indicated differences between pre-, early post- and late postcrisis cells. Early postcrisis cells demonstrated a logarithmic growth curve, very short telomeres and, notably, no increase in hTERT or telomerase activity despite downregulation of several negative hTERT regulators (e.g. FOS, JUN D, SMAD3, RUNX2, TNF-alpha and TGFbeta-R2). Thereafter, cMYC mRNA increased in parallel with increased hTERT expression, telomerase activity and elongation of short telomeres, indicating a step-wise activation of hTERT transcription involving reduction of negative regulators followed by activation of positive regulator(s). Gene expression analysis indicated that cells escaped growth crisis by deregulated DNA damage response and senescence controlling genes, including downregulation of ATM, CDKN1B (p27), CDKN2D (p19) and ASF1A and upregulation of CDK4, TWIST1, TP73L (p63) and SYK. Telomerase upregulation was thus found to be uncoupled to escape of growth crisis but rather a later event in the immortalization process of NBS T cell cultures.

  • 19.
    Degerman, Sofie
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Tumkur Sitaram, Raviprakash
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Ljungberg, Börje
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Urology and Andrology.
    Roos, Göran
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    The NBS1 gene is overexpressed and regulated by DJ-1 in clear cell renal cell carcinomaManuscript (preprint) (Other academic)
  • 20. Fogelstrand, Linda
    et al.
    Staffas, Anna
    Wasslavik, Carina
    Sjogren, Helene
    Soderhall, Stefan
    Frost, Britt-Marie
    Forestier, Erik
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Medical and Clinical Genetics.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Behrendtz, Mikael
    Heldrup, Jesper
    Karrman, Kristina
    Johansson, Bertil
    Heyman, Mats
    Abrahamsson, Jonas
    Palmqvist, Lars
    Prognostic Implications of Mutations in NOTCH1 and FBXW7 in Childhood T-ALL Treated According to the NOPHO ALL-1992 and ALL-2000 Protocols2014In: Pediatric Blood & Cancer, ISSN 1545-5009, E-ISSN 1545-5017, Vol. 61, no 3, p. 424-430Article in journal (Refereed)
    Abstract [en]

    Background In children, T-cell acute lymphoblastic leukemia (T-ALL) has inferior prognosis compared with B-cell precursor ALL. In order to improve survival, individualized treatment strategies and thus risk stratification algorithms are warranted, ideally already at the time of diagnosis.

    Procedure We analyzed the frequency and prognostic implication of mutations in NOTCH1 and FBXW7 in 79 cases of Swedish childhood T-ALL treated according to the Nordic Society of Pediatric Hematology and Oncology (NOPHO) ALL-1992 and ALL-2000 protocols. In a subgroup of patients, we also investigated the functional relevance of NOTCH1 mutations measured as expression of the HES1, MYB, and MYC genes.

    Results Forty-seven of the cases (59%) displayed mutations in NOTCH1 and/or FBXW7. There was no difference in overall (P=0.14) or event-free survival (EFS) (P=0.10) in patients with T-ALL with mutation(s) in NOTCH1/FBXW7 compared with patients with T-ALL without mutations in any of these genes. T-ALL carrying NOTCH1 mutations had increased HES1 and MYB mRNA expression (HES1 9.21.9 (mean +/- SEM), MYB 8.7 +/- 0.8 (mean +/- SEM)) compared to T-ALL with wild-type NOTCH1 (HES1 1.8 +/- 0.7, MYB 5.1 +/- 1.2, P=0.02 and 0.008, respectively). In cases of T-ALL with high HES1 expression, improved overall (P=0.02) and EFS (P=0.028) was seen.

    Conclusions Increased NOTCH activity, reflected by increased HES1 expression, is associated with improved outcome in pediatric T-ALL, but its role as a diagnostic tool or a therapeutic target in future clinical treatment protocols remains to be elucidated. Pediatr Blood Cancer 2014;61:424-430. (c) 2013 Wiley Periodicals, Inc.

  • 21.
    Framme, Jenny Lingman
    et al.
    Department of Pediatrics, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden; Department of Pediatrics, Halland Hospital Halmstad, Region Halland, Halmstad, Sweden.
    Lundqvist, Christina
    Department of Rheumatology and Inflammation Research, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden.
    Lundell, Anna-Carin
    Department of Rheumatology and Inflammation Research, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden.
    van Schouwenburg, Pauline A.
    Department of Pediatrics, Laboratory for Pediatric Immunology, Willem-Alexander Children’s Hospital, Leiden University Medical Center, Leiden, Netherlands.
    Lemarquis, Andri L.
    Department of Pediatrics, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden.
    Thörn, Karolina
    Department of Rheumatology and Inflammation Research, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden.
    Lindgren, Susanne
    Department of Pediatrics, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden; Department of Rheumatology and Inflammation Research, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden.
    Gudmundsdottir, Judith
    Department of Pediatrics, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden; Children’s Medical Center, National University Hospital of Iceland, Reykjavík, Iceland.
    Lundberg, Vanja
    Department of Pediatrics, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden; Department of Rheumatology and Inflammation Research, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology. Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Zetterström, Rolf H.
    Centre for Inherited Metabolic Diseases, Karolinska University Hospital Solna, Stockholm, Sweden; Department of Molecular Medicine and Surgery, Karolinska Institute, Stockholm, Sweden.
    Borte, Stephan
    ImmunoDeficiencyCenter Leipzig (IDCL), Municipal Hospital St. Georg Leipzig, Leipzig, Germany.
    Hammarström, Lennart
    Department of Biosciences and Nutrition, Neo, Karolinska Institute, Stockholm, Sweden.
    Telemo, Esbjörn
    Department of Rheumatology and Inflammation Research, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden.
    Hultdin, Magnus
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    van der Burg, Mirjam
    Department of Pediatrics, Laboratory for Pediatric Immunology, Willem-Alexander Children’s Hospital, Leiden University Medical Center, Leiden, Netherlands.
    Fasth, Anders
    Department of Pediatrics, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden.
    Oskarsdóttir, Sólveig
    Department of Pediatrics, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden.
    Ekwall, Olov
    Department of Pediatrics, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden; Department of Rheumatology and Inflammation Research, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden.
    Long-Term Follow-Up of Newborns with 22q11 Deletion Syndrome and Low TRECs2022In: Journal of Clinical Immunology, ISSN 0271-9142, E-ISSN 1573-2592, Vol. 42, p. 618-633Article in journal (Refereed)
    Abstract [en]

    Background: Population-based neonatal screening using T-cell receptor excision circles (TRECs) identifies infants with profound T lymphopenia, as seen in cases of severe combined immunodeficiency, and in a subgroup of infants with 22q11 deletion syndrome (22q11DS).

    Purpose: To investigate the long-term prognostic value of low levels of TRECs in newborns with 22q11DS.

    Methods: Subjects with 22q11DS and low TRECs at birth (22q11Low, N=10), matched subjects with 22q11DS and normal TRECs (22q11Normal, N=10), and matched healthy controls (HC, N=10) were identified. At follow-up (median age 16 years), clinical and immunological characterizations, covering lymphocyte subsets, immunoglobulins, TRECs, T-cell receptor repertoires, and relative telomere length (RTL) measurements were performed.

    Results: At follow-up, the 22q11Low group had lower numbers of naïve T-helper cells, naïve T-regulatory cells, naïve cytotoxic T cells, and persistently lower TRECs compared to healthy controls. Receptor repertoires showed skewed V-gene usage for naïve T-helper cells, whereas for naïve cytotoxic T cells, shorter RTL and a trend towards higher clonality were found. Multivariate discriminant analysis revealed a clear distinction between the three groups and a skewing towards Th17 differentiation of T-helper cells, particularly in the 22q11Low individuals. Perturbations of B-cell subsets were found in both the 22q11Low and 22q11Normal group compared to the HC group, with larger proportions of naïve B cells and lower levels of memory B cells, including switched memory B cells.

    Conclusions: This long-term follow-up study shows that 22q11Low individuals have persistent immunologic aberrations and increased risk for immune dysregulation, indicating the necessity of lifelong monitoring.

    Clinical Implications: This study elucidates the natural history of childhood immune function in newborns with 22q11DS and low TRECs, which may facilitate the development of programs for long-term monitoring and therapeutic choices.

    Download full text (pdf)
    fulltext
  • 22. Garcia-Cisneros, A.
    et al.
    Perez-Portela, R.
    Almroth, B. C.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences.
    Palacin, C.
    Skold, H. Nilsson
    Long telomeres are associated with clonality in wild populations of the fissiparous starfish Coscinasterias tenuispina2015In: Heredity, ISSN 0018-067X, E-ISSN 1365-2540, Vol. 115, no 5, p. 437-443Article in journal (Refereed)
    Abstract [en]

    Telomeres usually shorten during an organism's lifespan and have thus been used as an aging and health marker. When telomeres become sufficiently short, senescence is induced. The most common method of restoring telomere length is via telomerase reverse transcriptase activity, highly expressed during embryogenesis. However, although asexual reproduction from adult tissues has an important role in the life cycles of certain species, its effect on the aging and fitness of wild populations, as well as its implications for the long-term survival of populations with limited genetic variation, is largely unknown. Here we compare relative telomere length of 58 individuals from four populations of the asexually reproducing starfish Coscinasterias tenuispina. Additionally, 12 individuals were used to compare telomere lengths in regenerating and non-regenerating arms, in two different tissues (tube feet and pyloric cecum). The level of clonality was assessed by genotyping the populations based on 12 specific microsatellite loci and relative telomere length was measured via quantitative PCR. The results revealed significantly longer telomeres in Mediterranean populations than Atlantic ones as demonstrated by the Kruskal-Wallis test (K=24.17, significant value: P-value <0.001), with the former also characterized by higher levels of clonality derived from asexual reproduction. Telomeres were furthermore significantly longer in regenerating arms than in non-regenerating arms within individuals (pyloric cecum tissue: Mann-Whitney test, V=299, P-value <10(-6); and tube feet tissue Student's t=2.28, P-value = 0.029). Our study suggests that one of the mechanisms responsible for the long-term somatic maintenance and persistence of clonal populations is telomere elongation.

  • 23. Hagg, S.
    et al.
    Zhan, Y.
    Karlsson, R.
    Gerritsen, L.
    Ploner, A.
    van der Lee, S. J.
    Broer, L.
    Deelen, J.
    Marioni, R. E.
    Wong, A.
    Lundquist, Anders
    Umeå University, Faculty of Social Sciences, Umeå School of Business and Economics (USBE), Statistics.
    Zhu, G.
    Hansell, N. K.
    Sillanpaa, E.
    Fedko, I. O.
    Amin, N. A.
    Beekman, M.
    de Craen, A. J. M.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Harris, S. E.
    Kan, K-J
    Martin-Ruiz, C. M.
    Montgomery, G. W.
    Adolfsson, Annelie N.
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Psychiatry.
    Reynolds, C. A.
    Samani, N. J.
    Suchiman, H. E. D.
    Viljanen, A.
    von Zglinicki, T.
    Wright, M. J.
    Hottenga, J-J
    Boomsma, D. I.
    Rantanen, T.
    Kaprio, J. A.
    Nyholt, D. R.
    Martin, N. G.
    Nyberg, Lars
    Umeå University, Faculty of Medicine, Department of Radiation Sciences. Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB). Umeå University, Faculty of Medicine, Umeå Centre for Functional Brain Imaging (UFBI).
    Adolfsson, Rolf
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Psychiatry.
    Kuh, D.
    Starr, J. M.
    Deary, I. J.
    Slagboom, P. E.
    van Duijn, C. M.
    Codd, V.
    Pedersen, N. L.
    Short telomere length is associated with impaired cognitive performance in European ancestry cohorts2017In: Translational Psychiatry, E-ISSN 2158-3188, Vol. 7, article id e1100Article in journal (Refereed)
    Abstract [en]

    The association between telomere length (TL) dynamics on cognitive performance over the life-course is not well understood. This study meta-analyses observational and causal associations between TL and six cognitive traits, with stratifications on APOE genotype, in a Mendelian Randomization (MR) framework. Twelve European cohorts (N = 17 052; mean age = 59.2 +/- 8.8 years) provided results for associations between qPCR-measuredTL (T/S-ratio scale) and general cognitive function, mini-mental state exam (MMSE), processing speed by digit symbol substitution test (DSST), visuospatial functioning, memory and executive functioning (STROOP). In addition, a genetic risk score (GRS) for TL including seven known genetic variants for TL was calculated, and used in associations with cognitive traits as outcomes in all cohorts. Observational analyses showed that longer telomeres were associated with better scores on DSST (beta = 0.051 per s. d.-increase of TL; 95% confidence interval (CI): 0.024, 0.077; P = 0.0002), and MMSE (beta = 0.025; 95% CI: 0.002, 0.047; P = 0.03), and faster STROOP (beta = -0.053; 95% CI: -0.087, -0.018; P = 0.003). Effects for DSST were stronger in APOE epsilon 4 non-carriers (beta = 0.081; 95% CI: 0.045, 0.117; P = 1.0 x 10(-5)), whereas carriers performed better in STROOP (beta = -0.074; 95% CI: -0.140, -0.009; P = 0.03). Causal associations were found for STROOP only (beta = -0.598 per s. d.-increase of TL; 95% CI: -1.125, -0.072; P = 0.026), with a larger effect in epsilon 4-carriers (beta = -0.699; 95% CI: -1.330, -0.069; P = 0.03). Two-sample replication analyses using CHARGE summary statistics showed causal effects between TL and general cognitive function and DSST, but not with STROOP. In conclusion, we suggest causal effects from longer TL on better cognitive performance, where APOE epsilon 4-carriers might be at differential risk.

    Download full text (pdf)
    fulltext
  • 24.
    Haider, Zahra
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences.
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences.
    Golovleva, Irina
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Medical and Clinical Genetics.
    Erlanson, Martin
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Oncology.
    Noren-Nyström, Ulrika
    Hultdin, Magnus
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences.
    Epigenetic and genetic distinctions between T-cell acute lymphoblastic leukemia and lymphomaManuscript (preprint) (Other academic)
  • 25.
    Haider, Zahra
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Golovleva, Irina
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Medical and Clinical Genetics.
    Erlanson, Martin
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Oncology.
    Schmiegelow, Kjeld
    Flaegstad, Trond
    Kanerva, Jukka
    Norén-Nyström, Ulrika
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Paediatrics.
    Hultdin, Magnus
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology. Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    DNA methylation and copy number variation profiling of T-cell lymphoblastic leukemia and lymphoma2020In: Blood Cancer Journal, E-ISSN 2044-5385, Vol. 10, no 4, article id 45Article in journal (Refereed)
    Abstract [en]

    Despite having common overlapping immunophenotypic and morphological features, T-cell lymphoblastic leukemia (T-ALL) and lymphoma (T-LBL) have distinct clinical manifestations, which may represent separate diseases. We investigated and compared the epigenetic and genetic landscape of adult and pediatric T-ALL (n = 77) and T-LBL (n = 15) patient samples by high-resolution genome-wide DNA methylation and Copy Number Variation (CNV) BeadChip arrays. DNA methylation profiling identified the presence of CpG island methylator phenotype (CIMP) subgroups within both pediatric and adult T-LBL and T-ALL. An epigenetic signature of 128 differentially methylated CpG sites was identified, that clustered T-LBL and T-ALL separately. The most significant differentially methylated gene loci included the SGCE/PEG10 shared promoter region, previously implicated in lymphoid malignancies. CNV analysis confirmed overlapping recurrent aberrations between T-ALL and T-LBL, including 9p21.3 (CDKN2A/CDKN2B) deletions. A significantly higher frequency of chromosome 13q14.2 deletions was identified in T-LBL samples (36% in T-LBL vs. 0% in T-ALL). This deletion, encompassing the RB1, MIR15A and MIR16-1 gene loci, has been reported as a recurrent deletion in B-cell malignancies. Our study reveals epigenetic and genetic markers that can distinguish between T-LBL and T-ALL, and deepen the understanding of the biology underlying the diverse disease localization.

    Download full text (pdf)
    fulltext
  • 26.
    Haider, Zahra
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Larsson, Pär
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Köhn, Linda
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Oncology. Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Schmiegelow, Kjeld
    Flaegstad, Trond
    Kanerva, Jukka
    Heyman, Mats
    Hultdin, Magnus
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    An integrated transcriptome analysis in T-cell acute lymphoblastic leukemia links DNA methylation subgroups to dysregulated TAL1 and ANTP homeobox gene expression2019In: Cancer Medicine, E-ISSN 2045-7634, Vol. 8, no 1, p. 311-324Article in journal (Refereed)
    Abstract [en]

    Classification of pediatric T‐cell acute lymphoblastic leukemia (T‐ALL) patients into CIMP (CpG Island Methylator Phenotype) subgroups has the potential to improve current risk stratification. To investigate the biology behind these CIMP subgroups, diagnostic samples from Nordic pediatric T‐ALL patients were characterized by genome‐wide methylation arrays, followed by targeted exome sequencing, telomere length measurement, and RNA sequencing. The CIMP subgroups did not correlate significantly with variations in epigenetic regulators. However, the CIMP+ subgroup, associated with better prognosis, showed indicators of longer replicative history, including shorter telomere length (P = 0.015) and older epigenetic (P < 0.001) and mitotic age (P < 0.001). Moreover, the CIMP+ subgroup had significantly higher expression of ANTP homeobox oncogenes, namely TLX3, HOXA9, HOXA10, and NKX2‐1, and novel genes in T‐ALL biology including PLCB4, PLXND1, and MYO18B. The CIMP− subgroup, with worse prognosis, was associated with higher expression of TAL1 along with frequent STIL‐TAL1 fusions (2/40 in CIMP+ vs 11/24 in CIMP−), as well as stronger expression of BEX1. Altogether, our findings suggest different routes for leukemogenic transformation in the T‐ALL CIMP subgroups, indicated by different replicative histories and distinct methylomic and transcriptomic profiles. These novel findings can lead to new therapeutic strategies.

    Download full text (pdf)
    fulltext
  • 27. Henckel, E.
    et al.
    Svenson, Ulrika
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Nordlund, B.
    Berggren Broström, E.
    Hedlin, G.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Bohlin, K.
    Telomere length was similar in school-age children with bronchopulmonary dysplasia and allergic asthma2018In: Acta Paediatrica, ISSN 0803-5253, E-ISSN 1651-2227, Vol. 107, no 8, p. 1395-1401Article in journal (Refereed)
    Abstract [en]

    Aim: Inflammation is a major factor in the pathophysiology of bronchopulmonary dysplasia (BPD), and it contributes to accelerated telomere shortening and cellular ageing. This study aimed to determine its effect on telomere length and lung function in school-aged children born preterm with BPD.

    Methods: We examined 29 children with BPD, born preterm in Stockholm county 1998-99, along with 28 children with allergic asthma born at term matched for age and gender. At 10 years of age, we measured relative telomere length (RTL) in blood by quantitative polymerase chain reaction, lung function by spirometry and inflammation by fractional exhaled nitric oxide and blood cytokines.

    Results: RTL was not different in preterm born with BPD compared to term born children with asthma. The gender effect was strong in both groups; girls had significantly longer median RTL than boys (1.8 versus 1.5, p < 0.01). Short RTL was associated with low forced expiratory flow, also after adjusting for gender, but was not affected by severity of BPD or ongoing inflammation.

    Conclusion: Telomere length was similar in 10-year-old children born preterm with a history of BPD and term born children with allergic asthma. However, impaired lung function and male gender were associated wrth short telomeres.

  • 28. Henckel, Ewa
    et al.
    James, Anna
    Konradsen, Jon R.
    Nordlund, Björn
    Kjellberg, Malin
    Berggren-Broström, Eva
    Hedlin, Gunilla
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology. Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Bohlin, Kajsa
    A novel association between ykl-40, a marker of structural lung disease, and short telomere length in 10-year-old children with bronchopulmonary dysplasia2021In: Children, E-ISSN 2227-9067, Vol. 8, no 2, article id 80Article in journal (Refereed)
    Abstract [en]

    Extremely preterm infants are born with immature lungs and are exposed to an inflammatory environment as a result of oxidative stress. This may lead to airway remodeling, cellular aging and the development of bronchopulmonary dysplasia (BPD). Reliable markers that predict the long-term consequences of BPD in infancy are still lacking. We analyzed two biomarkers of cellular aging and lung function, telomere length and YKL-40, respectively, at 10 years of age in children born preterm with a history of BPD (n = 29). For comparison, these markers were also evaluated in sex-and-age-matched children born at term with childhood asthma (n = 28). Relative telomere length (RTL) was measured in whole blood with qPCR and serum YKL-40 with ELISA, and both were studied in relation to gas exchange and the regional ventilation/perfusion ratio using three-dimensional V/Q-scintigraphy (single photon emission computer tomography, SPECT) in children with BPD. Higher levels of YKL-40 were associated with shorter leukocyte RTL (Pearson’s correlation: −0.55, p = 0.002), but were not associated with a lower degree of matching between ventilation and perfusion within the lung. Serum YKL-40 levels were significantly higher in children with BPD compared to children with asthma (17.7 vs. 13.2 ng/mL, p < 0.01). High levels of YKL-40 and short RTLs were associated to the need for ventilatory support more than 1 month in the neonatal period (p < 0.01). The link between enhanced telomere shortening in childhood and structural remodeling of the lung, as observed in children with former BPD but not in children with asthma at the age of 10 years, suggests altered lung development related to prematurity and early life inflammatory exposure. In conclusion, relative telomere length and YKL-40 may serve as biomarkers of altered lung development as a result of early-life inflammation in children with a history of prematurity.

    Download full text (pdf)
    fulltext
  • 29. Henckel, Ewa
    et al.
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Haider, Zahra
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Kosma, Paraskevi
    Hultdin, Magnus
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Bohlin, Kajsa
    Hematopoietic cellular aging is not accelerated during the first 2 years of life in children born preterm2020In: Pediatric Research, ISSN 0031-3998, E-ISSN 1530-0447, Vol. 88Article in journal (Refereed)
    Abstract [en]

    Background: Prematurity in itself and exposure to neonatal intensive care triggers inflammatory processes and oxidative stress, leading to risk for disease later in life. The effects on cellular aging processes are incompletely understood.

    Methods: Relative telomere length (RTL) was measured by qPCR in this longitudinal cohort study with blood samples taken at birth and at 2 years of age from 60 children (16 preterm and 44 term). Viral respiratory infections the first year were evaluated. Epigenetic biological DNA methylation (DNAm) age was predicted based on methylation array data in 23 children (11 preterm and 12 term). RTL change/year and DNAm age change/year was compared in preterm and term during the 2 first years of life.

    Results: Preterm infants had longer telomeres than term born at birth and at 2 years of age, but no difference in telomere attrition rate could be detected. Predicted epigenetic DNAm age was younger in preterm infants, but rate of DNAm aging was similar in both groups.

    Conclusions: Despite early exposure to risk factors for accelerated cellular aging, children born preterm exhibited preserved telomeres. Stress during the neonatal intensive care period did not reflect accelerated epigenetic DNAm aging. Early-life aging was not explained by preterm birth.

    Impact: Preterm birth is associated with elevated disease risk later in life. Preterm children often suffer from inflammation early in life. Stress-related telomere erosion during neonatal intensive care has been proposed. Inflammation-accelerated biological aging in preterm is unknown. We find no accelerated aging due to prematurity or infections during the first 2 years of life.

  • 30. Hirvonen, Elina A. M.
    et al.
    Peuhkuri, Saara
    Norberg, Anna
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Medical and Clinical Genetics.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Hannula-Jouppi, Katariina
    Välimaa, Hannamari
    Kilpivaara, Outi
    Wartiovaara-Kautto, Ulla
    Characterization of an X-chromosome-linked telomere biology disorder in females with DKC1 mutation2019In: Leukemia, ISSN 0887-6924, E-ISSN 1476-5551, Vol. 33, no 1, p. 275-278Article in journal (Refereed)
  • 31.
    Kolan, Shrikant S
    et al.
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology, Immunology/Immunchemistry.
    Lidström, Tommy
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology, Immunology/Immunchemistry.
    Mediavilla, Tomás
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB).
    Dernstedt, Andy
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology, Immunology/Immunchemistry.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Hultdin, Magnus
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Björk, Karl
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology, Immunology/Immunchemistry.
    Marcellino, Daniel
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB).
    Forsell, Mattias N. E.
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology, Immunology/Immunchemistry.
    Growth-inhibition of cell lines derived from B cell lymphomas through antagonism of serotonin receptor signaling2019In: Scientific Reports, E-ISSN 2045-2322, Vol. 9, article id 4276Article in journal (Refereed)
    Abstract [en]

    A majority of lymphomas are derived from B cells and novel treatments are required to treat refractory disease. Neurotransmitters such as serotonin and dopamine influence activation of B cells and the effects of a selective serotonin 1A receptor (5HT1A) antagonist on growth of a number of B cell-derived lymphoma cell lines were investigated. We confirmed the expression of 5HT1A in human lymphoma tissue and in several well-defined experimental cell lines. We discovered that the pharmacological inhibition of 5HT1A led to the reduced proliferation of B cell-derived lymphoma cell lines together with DNA damage, ROS-independent caspase activation and apoptosis in a large fraction of cells. Residual live cells were found ‘locked’ in a non-proliferative state in which a selective transcriptional and translational shutdown of genes important for cell proliferation and metabolism occurred (e.g., AKT, GSK-3β, cMYC and p53). Strikingly, inhibition of 5HT1A regulated mitochondrial activity through a rapid reduction of mitochondrial membrane potential and reducing dehydrogenase activity. Collectively, our data suggest 5HT1A antagonism as a novel adjuvant to established cancer treatment regimens to further inhibit lymphoma growth.

    Download full text (pdf)
    fulltext
  • 32. Kostjukovits, Svetlana
    et al.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Pekkinen, Minna
    Klemetti, Paula
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Roos, Göran
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Taskinen, Mervi
    Makitie, Outi
    Decreased telomere length in children with cartilage-hair hypoplasia2017In: Journal of Medical Genetics, ISSN 0022-2593, E-ISSN 1468-6244, Vol. 54, no 5, p. 365-370Article in journal (Refereed)
    Abstract [en]

    Background Cartilage-hair hypoplasia (CHH) is an autosomal recessive chondrodysplasia caused by RMRP (RNA component of mitochondrial RNA processing endoribonuclease) gene mutations. Manifestations include short stature, variable immunodeficiency, anaemia and increased risk of malignancies, all of which have been described also in telomere biology disorders. RMRP interacts with the telomerase RT (TERT) subunit, but the influence of RMRP mutations on telomere length is unknown. We measured relative telomere length (RTL) in patients with CHH, their first-degree relatives and healthy controls and correlated RTL with clinical and laboratory features. Methods The study cohort included 48 patients with CHH with homozygous (n=36) or compound heterozygous RMRP mutations (median age 38.2 years, range 6.0-70.8 years), 86 relatives (74 with a heterozygous RMRP mutation) and 94 unrelated healthy controls. We extracted DNA from peripheral blood, sequenced the RMRP gene and measured RTL by qPCR. Results Compared with age-matched and sex-matched healthy controls, median RTL was significantly shorter in patients with CHH (n=40 pairs, 1.05 vs 1.21, p=0.017), but not in mutation carriers (n=48 pairs, 1.16 vs 1.10, p=0.224). RTL correlated significantly with age in RMRP mutation carriers (r=-0.482, p < 0.001) and non-carriers (r=-0.498, p<0.001), but not in patients (r=-0.236, p=0.107). In particular children (< 18 years) with CHH had shorter telomeres than controls (median RTL 1.12 vs 1.26, p=0.008). In patients with CHH, RTL showed no correlation with genotype, clinical or laboratory characteristics. Conclusions Telomere length was decreased in children with CHH. We found no correlation between RTL and clinical or laboratory parameters.

  • 33. Laukkanen, Saara
    et al.
    Oksa, Laura
    Nikkilä, Atte
    Lahnalampi, Mari
    Parikka, Mataleena
    Seki, Masafumi
    Takita, Junko
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology. Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    de Bock, Charles E.
    Heinaniemi, Merja
    Lohi, Olli
    SIX6 is a TAL1-regulated transcription factor in T-ALL and associated with inferior outcome2020In: Leukemia and Lymphoma, ISSN 1042-8194, E-ISSN 1029-2403, Vol. 61, no 13, p. 3089-3100Article in journal (Refereed)
    Abstract [en]

    T-cell acute lymphoblastic leukemia (T-ALL) is a hematological malignancy driven by abnormal activity of transcription factors. Here we report an aberrant expression of the developmental transcription factor SIX6 in the TAL1-subtype of T-ALL. Our results demonstrate that the binding of TAL1 and GATA3 transcription factors into an upstream enhancer element directly regulates SIX6 expression. High expression of SIX6 was associated with inferior event-free survival within three independent patient cohorts. At a functional level, CRISPR-Cas9-mediated knockout of the SIX6 gene in TAL1 positive Jurkat cells induced changes in genes associated with the mTOR-, K-RAS-, and TNFα-related molecular signatures but did not impair cell proliferation or viability. There was also no acceleration of T-ALL development within a Myc driven zebrafish tumor model in vivo. Taken together, our results show that SIX6 belongs to the TAL1 regulatory gene network in T-ALL but is alone insufficient to influence the development or maintenance of T-ALL.

  • 34.
    Mansouri, Larry
    et al.
    Department of Immunology, Genetics and Pathology, Rudbeck Laboratory, Uppsala University; Uppsala, Sweden.
    Grabowski, Pawel
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Svenson, Ulrika
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Gunnarsson, Rebeqa
    Department of Immunology, Genetics and Pathology, Rudbeck Laboratory, Uppsala University; Uppsala, Sweden.
    Cahill, Nicola
    Department of Immunology, Genetics and Pathology, Rudbeck Laboratory, Uppsala University; Uppsala, Sweden.
    Ekström Smedby, Karin
    Department of Medicine, Clinical Epidemiology Unit, Karolinska Institutet, Stockholm, Sweden.
    Geisler, Christian
    Department of Hematology, Rigshospitalet, Copenhagen, Denmark.
    Juliusson, Gunnar
    Department of Laboratory Medicine, Stem Cell Center, Hematology and Transplantation, Lund University, Lund, Sweden.
    Rosenquist, Richard
    Department of Immunology, Genetics and Pathology, Rudbeck Laboratory, Uppsala University; Uppsala, Sweden.
    Roos, Göran
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Telomere length is a robust prognostic marker in early chronic lymphocytic leukemiaManuscript (preprint) (Other academic)
  • 35. Mansouri, Larry
    et al.
    Grabowski, Pawel
    Umeå University, Faculty of Medicine, Department of Medical Biosciences.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Svenson, Ulrika
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Gunnarsson, Rebeqa
    Cahill, Nicola
    Smedby, Karin Ekstrom
    Geisler, Christian
    Juliusson, Gunnar
    Roos, Göran
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Rosenquist, Richard
    Short telomere length is associated with NOTCH1/SF3B1/TP53 aberrations and poor outcome in newly diagnosed chronic lymphocytic leukemia patients2013In: American Journal of Hematology, ISSN 0361-8609, E-ISSN 1096-8652, Vol. 88, no 8, p. 647-651Article in journal (Refereed)
  • 36.
    Norberg, Anna
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Medical and Clinical Genetics.
    Rosén, Anna
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Medical and Clinical Genetics. Umeå University, Faculty of Medicine, Department of Radiation Sciences, Oncology.
    Raaschou-Jensen, Klas
    Kjeldsen, Lars
    Moilanen, Jukka S.
    Paulsson-Karisson, Ylva
    Baliakas, Panagiotis
    Lohi, Olli
    Ahmed, Aymen
    Kittang, Astrid O.
    Larsson, Pär
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Medical and Clinical Genetics.
    Roos, Göran
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Hultdin, Magnus
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Novel variants in Nordic patients referred for genetic testing of telomere-related disorders2018In: European Journal of Human Genetics, ISSN 1018-4813, E-ISSN 1476-5438, Vol. 26, no 6, p. 858-867Article in journal (Refereed)
    Abstract [en]

    Telomere-related disorders are a clinically and genetically heterogeneous group of disorders characterized by premature telomere shortening and proliferative failure of a variety of tissues. This study reports the spectrum of telomere-related gene variants and telomere length in Nordic patients referred for genetic testing due to suspected telomere-related disorder. We performed Sanger sequencing of the genes TERT, TERC, DKC1, and TINF2 on 135 unrelated index patients and measured telomere length by qPCR on DNA from peripheral blood leukocytes. We identified pathogenic or likely pathogenic variants in 10 index patients, all of which had short telomeres compared to age-matched healthy controls. Six of the 10 variants were novel; three in TERC (n.69_74dupAGGCGC, n.122_125delGCGG, and n.407_408delinsAA) and three in TERT (p.(D684G), p.(R774*), and p.(*1133Wext*39)). The high proportion of novel variants identified in our study highlights the need for solid interpretation of new variants that may be detected. Measurement of telomere length is a useful approach for evaluating pathogenicity of genetic variants associated with telomere-related disorders.

  • 37.
    Provez, Lien
    et al.
    Normal and Malignant Hematopoiesis Laboratory, Department of Biomolecular Medicine, Ghent University, Ghent, Belgium; Cancer Research Institute Ghent (CRIG), Ghent, Belgium.
    Putteman, Tom
    Taghon Laboratory, Department of Diagnostic Sciences, Ghent University, Ghent, Belgium.
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Roels, Juliette
    Normal and Malignant Hematopoiesis Laboratory, Department of Biomolecular Medicine, Ghent University, Ghent, Belgium; Cancer Research Institute Ghent (CRIG), Ghent, Belgium; Taghon Laboratory, Department of Diagnostic Sciences, Ghent University, Ghent, Belgium.
    Reunes, Lindy
    Normal and Malignant Hematopoiesis Laboratory, Department of Biomolecular Medicine, Ghent University, Ghent, Belgium; Cancer Research Institute Ghent (CRIG), Ghent, Belgium.
    T’Sas, Sara
    Normal and Malignant Hematopoiesis Laboratory, Department of Biomolecular Medicine, Ghent University, Ghent, Belgium; Cancer Research Institute Ghent (CRIG), Ghent, Belgium; Unit for Translational Research in Oncology, Department of Diagnostic Sciences, Ghent University, Ghent, Belgium.
    Van Loocke, Wouter
    Normal and Malignant Hematopoiesis Laboratory, Department of Biomolecular Medicine, Ghent University, Ghent, Belgium; Cancer Research Institute Ghent (CRIG), Ghent, Belgium.
    Lintermans, Béatrice
    Normal and Malignant Hematopoiesis Laboratory, Department of Biomolecular Medicine, Ghent University, Ghent, Belgium; Cancer Research Institute Ghent (CRIG), Ghent, Belgium.
    De Coninck, Stien
    Normal and Malignant Hematopoiesis Laboratory, Department of Biomolecular Medicine, Ghent University, Ghent, Belgium; Cancer Research Institute Ghent (CRIG), Ghent, Belgium.
    Thenoz, Morgan
    Normal and Malignant Hematopoiesis Laboratory, Department of Biomolecular Medicine, Ghent University, Ghent, Belgium; Cancer Research Institute Ghent (CRIG), Ghent, Belgium.
    Sleeckx, Wouter
    Cancer Research Institute Ghent (CRIG), Ghent, Belgium; Unit for Translational Research in Oncology, Department of Diagnostic Sciences, Ghent University, Ghent, Belgium; Hematology Department, Ghent University Hospital (UZGent), Ghent, Belgium.
    Maćkowska-Maślak, Natalia
    Institute of Human Genetics, Polish Academy of Sciences, Poznań, Poland.
    Taghon, Tom
    Cancer Research Institute Ghent (CRIG), Ghent, Belgium; Taghon Laboratory, Department of Diagnostic Sciences, Ghent University, Ghent, Belgium.
    Mansour, Marc R.
    Leukaemia Biology Research Group, Department of Heamatology, University College London Cancer Institute, London, United Kingdom; UCL Great Ormond Street Institute of Child Health, London, United Kingdom.
    Farah, Nadine
    Leukaemia Biology Research Group, Department of Heamatology, University College London Cancer Institute, London, United Kingdom.
    Norga, Koen
    Paediatric Oncology at Antwerp University, Antwerp, Belgium.
    Vandenberghe, Peter
    Department of Human Genetics, Leuven University, Leuven, Belgium.
    Kotecha, Rishi S.
    Leukaemia Translational Research Laboratory, Telethon Kids Cancer Centre, Telethon Kids Institute, University of Western Australia, Perth, Australia; Department of Clinical Haematology, Oncology, Blood and Marrow Transplantation, Perth Children’s Hospital, Perth, Australia; Curtin Medical School, Curtin University, Perth, Australia.
    Goossens, Steven
    Cancer Research Institute Ghent (CRIG), Ghent, Belgium; Unit for Translational Research in Oncology, Department of Diagnostic Sciences, Ghent University, Ghent, Belgium.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology. Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    De Smedt, Renate
    Normal and Malignant Hematopoiesis Laboratory, Department of Biomolecular Medicine, Ghent University, Ghent, Belgium; Cancer Research Institute Ghent (CRIG), Ghent, Belgium.
    Van Vlierberghe, Pieter
    Normal and Malignant Hematopoiesis Laboratory, Department of Biomolecular Medicine, Ghent University, Ghent, Belgium; Cancer Research Institute Ghent (CRIG), Ghent, Belgium.
    Pre-clinical evaluation of the hypomethylating agent decitabine for the treatment of t-cell lymphoblastic lymphoma2023In: Cancers, ISSN 2072-6694, Vol. 15, no 3, article id 647Article in journal (Refereed)
    Abstract [en]

    T-cell lymphoblastic lymphoma (T-LBL) is a rare and aggressive lymphatic cancer, often diagnosed at a young age. Patients are treated with intensive chemotherapy, potentially followed by a hematopoietic stem cell transplantation. Although prognosis of T-LBL has improved with intensified treatment protocols, they are associated with side effects and 10–20% of patients still die from relapsed or refractory disease. Given this, the search toward less toxic anti-lymphoma therapies is ongoing. Here, we targeted the recently described DNA hypermethylated profile in T-LBL with the DNA hypomethylating agent decitabine. We evaluated the anti-lymphoma properties and downstream effects of decitabine, using patient derived xenograft (PDX) models. Decitabine treatment resulted in prolonged lymphoma-free survival in all T-LBL PDX models, which was associated with downregulation of the oncogenic MYC pathway. However, some PDX models showed more benefit of decitabine treatment compared to others. In more sensitive models, differentially methylated CpG regions resulted in more differentially expressed genes in open chromatin regions. This resulted in stronger downregulation of cell cycle genes and upregulation of immune response activating transcripts. Finally, we suggest a gene signature for high decitabine sensitivity in T-LBL. Altogether, we here delivered pre-clinical proof of the potential use of decitabine as a new therapeutic agent in T-LBL.

    Download full text (pdf)
    fulltext
  • 38.
    Pudas, Sara
    et al.
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB).
    Josefsson, Maria
    Umeå University, Faculty of Social Sciences, Centre for Demographic and Ageing Research (CEDAR).
    Nordin Adolfsson, Annelie
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Psychiatry.
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Kauppi, Karolina
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB). Department of Medical Epidemiology and Biostatistics, Karolinska Institute, Stockholm, Sweden.
    Veng-Taasti, Line Marie
    Umeå University, Faculty of Social Sciences, Department of Psychology.
    Hultdin, Magnus
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Adolfsson, Rolf
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Psychiatry.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology. Umeå University, Faculty of Medicine, Department of Clinical Microbiology.
    Short leukocyte telomeres, but not telomere attrition rates, predict memory decline in the 20-year longitudinal Betula study2021In: The journals of gerontology. Series A, Biological sciences and medical sciences, ISSN 1079-5006, E-ISSN 1758-535X, Vol. 76, no 6, p. 955-963Article in journal (Refereed)
    Abstract [en]

    Leukocyte telomere length (LTL) is a proposed biomarker for aging-related disorders, including cognitive decline and dementia. Long-term longitudinal studies measuring intra-individual changes in both LTL and cognitive outcomes are scarce, precluding strong conclusions about a potential aging-related relationship between LTL shortening and cognitive decline. This study investigated associations between baseline levels and longitudinal changes in LTL and memory performance across an up to 20-year follow-up in 880 dementia-free participants from a population-based study (mean baseline age: 56.8 years, range: 40–80; 52% female). Shorter baseline LTL significantly predicted subsequent memory decline (r = .34, 95% confidence interval: 0.06, 0.82), controlling for age, sex, and other relevant covariates. No significant associations were however observed between intra-individual changes in LTL and memory, neither concurrently nor with a 5-year time-lag between LTL shortening and memory decline. These results support the notion of short LTL as a predictive factor for aging-related memory decline, but suggest that LTL dynamics in adulthood and older age may be less informative of cognitive outcomes in aging. Furthermore, the results highlight the importance of long-term longitudinal evaluation of outcomes in biomarker research.

    Download full text (pdf)
    fulltext
  • 39. Roels, Juliette
    et al.
    Thénoz, Morgan
    Szarzyńska, Bronisława
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    De Coninck, Stien
    Demoen, Lisa
    Provez, Lien
    Kuchmiy, Anna
    Strubbe, Steven
    Reunes, Lindy
    Pieters, Tim
    Matthijssens, Filip
    Van Loocke, Wouter
    Erarslan-Uysal, Büşra
    Richter-Pechańska, Paulina
    Declerck, Ken
    Lammens, Tim
    De Moerloose, Barbara
    Deforce, Dieter
    Van Nieuwerburgh, Filip
    Cheung, Laurence C.
    Kotecha, Rishi S.
    Mansour, Marc R.
    Ghesquière, Bart
    Van Camp, Guy
    Berghe, Wim Vanden
    Kowalczyk, Jerzy R.
    Szczepański, Tomasz
    Davé, Utpal P.
    Kulozik, Andreas E.
    Goossens, Steven
    Curtis, David J.
    Taghon, Tom
    Dawidowska, Małgorzata
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology. Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Van Vlierberghe, Pieter
    Aging of preleukemic thymocytes drives CpG island hypermethylation in T-cell acute lymphoblastic leukemia2020In: Blood cancer discovery, ISSN 2643-3249, Vol. 1, no 3, p. 274-289Article in journal (Refereed)
    Abstract [en]

    Cancer cells display DNA hypermethylation at specific CpG islands in comparison to their normal healthy counterparts, but the mechanism that drives this so-called CpG island methylator phenotype (CIMP) remains poorly understood. Here, we show that CpG island methylation in human T-cell acute lymphoblastic leukemia (T-ALL) mainly occurs at promoters of Polycomb Repressor Complex 2 (PRC2) target genes that are not expressed in normal or malignant T-cells and which display a reciprocal association with H3K27me3 binding. In addition, we revealed that this aberrant methylation profile reflects the epigenetic history of T-ALL and is established already in pre-leukemic, self-renewing thymocytes that precede T-ALL development. Finally, we unexpectedly uncover that this age-related CpG island hypermethylation signature in T-ALL is completely resistant to the FDA-approved hypomethylating agent Decitabine. Altogether, we here provide conceptual evidence for the involvement of a pre-leukemic phase characterized by self-renewing thymocytes in the pathogenesis of human T-ALL.

  • 40.
    Schäfer Hackenhaar, Fernanda
    et al.
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB). Umeå University, Faculty of Medicine, Umeå Centre for Functional Brain Imaging (UFBI).
    Josefsson, Maria
    Umeå University, Faculty of Social Sciences, Centre for Demographic and Ageing Research (CEDAR). Umeå University, Faculty of Medicine, Umeå Centre for Functional Brain Imaging (UFBI). Umeå University, Faculty of Social Sciences, Umeå School of Business and Economics (USBE), Statistics.
    Nordin Adolfsson, Annelie
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Psychiatry.
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Kauppi, Karolina
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB). Department of Medical Epidemiology and Biostatistics, Karolinska Institute, Stockholm, Sweden.
    Hultdin, Magnus
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Adolfsson, Rolf
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Psychiatry.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology. Umeå University, Faculty of Medicine, Department of Clinical Microbiology.
    Pudas, Sara
    Umeå University, Faculty of Medicine, Umeå Centre for Functional Brain Imaging (UFBI). Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB).
    Short leukocyte telomeres predict 25-year Alzheimer's disease incidence in non-APOE ε4-carriers2021In: Alzheimer's Research & Therapy, E-ISSN 1758-9193, Vol. 13, article id 130Article in journal (Refereed)
    Abstract [en]

    Background: Leukocyte telomere length (LTL) has been shown to predict Alzheimer’s disease (AD), albeit inconsistently. Failing to account for the competing risks between AD, other dementia types, and mortality, can be an explanation for the inconsistent findings in previous time-to-event analyses. Furthermore, previous studies indicate that the association between LTL and AD is non-linear and may differ depending on apolipoprotein E (APOE) ε4 allele carriage, the strongest genetic AD predictor.

    Methods: We analyzed whether baseline LTL in interaction with APOE ε4 predicts AD, by following 1306 initially non-demented subjects for 25 years. Gender- and age-residualized LTL (rLTL) was categorized into tertiles of short, medium, and long rLTLs. Two complementary time-to-event models that account for competing risks were used; the Fine-Gray model to estimate the association between the rLTL tertiles and the cumulative incidence of AD, and the cause-specific hazard model to assess whether the cause-specific risk of AD differed between the rLTL groups. Vascular dementia and death were considered competing risk events. Models were adjusted for baseline lifestyle-related risk factors, gender, age, and non-proportional hazards.

    Results: After follow-up, 149 were diagnosed with AD, 96 were diagnosed with vascular dementia, 465 died without dementia, and 596 remained healthy. Baseline rLTL and other covariates were assessed on average 8 years before AD onset (range 1–24). APOE ε4-carriers had significantly increased incidence of AD, as well as increased cause-specific AD risk. A significant rLTL-APOE interaction indicated that short rLTL at baseline was significantly associated with an increased incidence of AD among non-APOE ε4-carriers (subdistribution hazard ratio = 3.24, CI 1.404–7.462, P = 0.005), as well as borderline associated with increased cause-specific risk of AD (cause-specific hazard ratio = 1.67, CI 0.947–2.964, P = 0.07). Among APOE ε4-carriers, short or long rLTLs were not significantly associated with AD incidence, nor with the cause-specific risk of AD.

    Conclusions: Our findings from two complementary competing risk time-to-event models indicate that short rLTL may be a valuable predictor of the AD incidence in non-APOE ε4-carriers, on average 8 years before AD onset. More generally, the findings highlight the importance of accounting for competing risks, as well as the APOE status of participants in AD biomarker research.

    Download full text (pdf)
    fulltext
  • 41.
    Schäfer Hackenhaar, Fernanda
    et al.
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB). Umeå University, Faculty of Medicine, Umeå Centre for Functional Brain Imaging (UFBI).
    Josefsson, Maria
    Umeå University, Faculty of Social Sciences, Centre for Demographic and Ageing Research (CEDAR). Umeå University, Faculty of Medicine, Umeå Centre for Functional Brain Imaging (UFBI). Umeå University, Faculty of Social Sciences, Umeå School of Business and Economics (USBE), Statistics.
    Nordin Adolfsson, Annelie
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Psychiatry.
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Kauppi, Karolina
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB).
    Porter, Tenielle
    Centre for Precision Health, Edith Cowan University, Joondalup, WA, Australia; Collaborative Genomics and Translation Group, School of Medical and Health Sciences, Edith Cowan University, Joondalup, WA, Australia; Curtin Medical School, Curtin University, Bentley, WA, Australia.
    Milicic, Lidija
    Centre for Precision Health, Edith Cowan University, Joondalup, WA, Australia; Collaborative Genomics and Translation Group, School of Medical and Health Sciences, Edith Cowan University, Joondalup, WA, Australia.
    Laws, Simon M.
    Centre for Precision Health, Edith Cowan University, Joondalup, WA, Australia; Collaborative Genomics and Translation Group, School of Medical and Health Sciences, Edith Cowan University, Joondalup, WA, Australia; Curtin Medical School, Curtin University, Bentley, WA, Australia.
    Hultdin, Magnus
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Adolfsson, Rolf
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Psychiatry.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology. Umeå University, Faculty of Medicine, Department of Clinical Microbiology.
    Pudas, Sara
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB). Umeå University, Faculty of Medicine, Umeå Centre for Functional Brain Imaging (UFBI).
    the Australian Imaging Biomarkers and Lifestyle Study,
    Sixteen-year longitudinal evaluation of blood-based DNA methylation biomarkers for early prediction of Alzheimer’s disease2023In: Journal of Alzheimer's Disease, ISSN 1387-2877, E-ISSN 1875-8908, Vol. 94, no 4, p. 1443-1464Article in journal (Refereed)
    Abstract [en]

    Background: DNA methylation (DNAm), an epigenetic mark reflecting both inherited and environmental influences, hasshown promise for Alzheimer’s disease (AD) prediction.Objective: Testing long-term predictive ability (>15 years) of existing DNAm-based epigenetic age acceleration (EAA)measures and identifying novel early blood-based DNAm AD-prediction biomarkers.

    Methods: EAA measures calculated from Illumina EPIC data from blood were tested with linear mixed-effects models(LMMs) in a longitudinal case-control sample (50 late-onset AD cases; 51 matched controls) with prospective data up to 16years before clinical onset, and post-onset follow-up. NovelDNAmbiomarkers were generated with epigenome-wide LMMs,and Sparse Partial Least Squares Discriminant Analysis applied at pre- (10–16 years), and post-AD-onset time-points.

    Results: EAA did not differentiate cases from controls during the follow-up time (p > 0.05). Three new DNA biomarkersshowed in-sample predictive ability on average 8 years pre-onset, after adjustment for age, sex, and white blood cell proportions(p-values: 0.022-<0.00001). Our longitudinally-derived panel replicated nominally (p = 0.012) in an external cohort (n = 146cases, 324 controls). However, its effect size and discriminatory accuracy were limited compared to APOE 4-carriership(OR = 1.38 per 1 SD DNAmscore increase versus OR= 13.58 for 4-allele carriage; AUCs = 77.2% versus 87.0%). Literaturereview showed low overlap (n = 4) across 3275 AD-associated CpGs from 8 published studies, and no overlap with ouridentified CpGs.

    Conclusion: The limited predictive value of EAA for AD extends prior findings by considering a longer follow-up time, andwith appropriate control for age, sex, APOE, and blood-cell proportions. Results also highlight challenges with replicatingdiscriminatory or predictive CpGs across studies.

    Download full text (pdf)
    fulltext
  • 42.
    Sitaram, Raviprakash T
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Ljungberg, Börje
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Urology and Andrology.
    Andersson, Emma
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Oji, Y
    Department of Cancer Stem Cell Biology, Osaka University Graduate School of Medicine, Osaka, Japan.
    Sugiyama, H
    Department of Functional Diagnostic Science, Osaka University Graduate School of Medicine, Osaka, Japan.
    Roos, Göran
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Li, Ai-Hong
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Clinical chemistry.
    Wilms' tumour 1 can suppress hTERT gene expression and telomerase activity in clear cell renal cell carcinoma via multiple pathways2010In: British Journal of Cancer, ISSN 0007-0920, E-ISSN 1532-1827, Vol. 103, no 8, p. 1255-1262Article in journal (Refereed)
    Abstract [en]

    BACKGROUND: Wilms' tumour 1 (WT1) gene was discovered as a tumour suppressor gene. Later findings have suggested that WT1 also can be oncogenic. This complexity is partly explained by the fact that WT1 has a number of target genes.

    METHOD: WT1 and its target gene human telomerase reverse transcriptase (hTERT) were analysed in clear cell renal cell carcinoma (ccRCC). In vitro experiments were performed to examine the functional link between WT1 and hTERT by overexpression of WT1 isoforms in the ccRCC cell line, TK-10.

    RESULTS: WT1 demonstrated lower RNA expression in ccRCC compared with renal cortical tissue, whereas hTERT was increased, showing a negative correlation between WT1 and hTERT (P=0.005). These findings were experimentally confirmed in vitro. The WT1 generated effect on hTERT promoter activity seemed complex, as several negative regulators of hTERT transcription, such as SMAD3, JUN (AP-1) and ETS1, were activated by WT1 overexpression. Downregulation of potential positive hTERT regulators, such as cMyc, AP-2α, AP-2γ, IRF1, NFX1 and GM-CSF, were also observed. Chromatin immunoprecipitation analysis verified WT1 binding to the hTERT, cMyc and SMAD3 promoters.

    CONCLUSION: The collected data strongly indicate multiple pathways for hTERT regulation by WT1 in ccRCC.

  • 43. Siwicki, Jan Konrad
    et al.
    Berglund, Mattias
    Rygier, Jolanta
    Pienkowska-Grela, Barbara
    Grygalewicz, Beata
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Golovleva, Irina
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Medical and Clinical Genetics.
    Chrzanowska, Krystyna H
    Lagercrantz, Svetlana
    Blennow, Elisabeth
    Roos, Göran
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Larsson, Catharina
    Spontaneously immortalized human T lymphocytes develop gain of chromosomal region 2p13-24 as an early and common genetic event2004In: Genes, Chromosomes and Cancer, ISSN 1045-2257, E-ISSN 1098-2264, Vol. 41, no 2, p. 133-144Article in journal (Refereed)
  • 44.
    Siwicki, Jan Konrad
    et al.
    Department of Immunology, M. Skladowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Chrzanowska, Krystyna H
    Department of Medical Genetics, Childrens Memorial Health Institute, Warsaw, Poland.
    Roos, Göran
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Telomere maintenance and cell cycle regulation in spontaneously immortalized T-cell lines from Nijmegen breakage syndrome patients2003In: Experimental Cell Research, ISSN 0014-4827, E-ISSN 1090-2422, Vol. 287, no 1, p. 178-189Article in journal (Refereed)
    Abstract [en]

    Nijmegen breakage syndrome (NBS) is a rare genetic instability syndrome associated with a high incidence of lymphoid malignancies. The NBS1 protein has been implicated in telomere biology suggesting that cells from NBS patients might have deficient telomere maintenance capacity. In this study we characterized spontaneously immortalized T-cell lines derived from three NBS patients regarding growth characteristics, telomere biology, expression of cell-cycle regulators, and response to DNA damage to understand the role of NBS1 in the immortalization process. In all the NBS T-cell lines the acquisition of an immortal phenotype was associated with telomere length stabilization, high telomerase activity, and increased mRNA expression of the catalytic subunit of telomerase (hTERT), together with c-myc up-regulation. Our findings provide evidence that telomere length maintenance was intact in the T lymphocytes in the absence of a full-length NBS protein, presumably due to the presence of an alternatively transcribed NBS protein of 70 kDa. Normal protein expression patterns for pRb and p53 in all the immortal lines coincided with altered expression of some cell-cycle proteins as well as with an impaired G1/S arrest after gamma irradiation, despite a seemingly normal p53/p21 pathway. The here described, spontaneously immortalized NBS derived T-cell lines can be useful in future analysis of the biologic effects in the NBS.

  • 45. Trotta, Luca
    et al.
    Norberg, Anna
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Medical and Clinical Genetics.
    Taskinen, Mervi
    Beziat, Vivien
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Wartiovaara-Kautto, Ulla
    Valimaa, Hannamari
    Jahnukainen, Kirsi
    Casanova, Jean-Laurent
    Seppanen, Mikko
    Saarela, Janna
    Koskenvuo, Minna
    Martelius, Timi
    Diagnostics of rare disorders: whole-exome sequencing deciphering locus heterogeneity in telomere biology disorders2018In: Orphanet Journal of Rare Diseases, E-ISSN 1750-1172, Vol. 13, article id 139Article in journal (Refereed)
    Abstract [en]

    Background: The telomere biology disorders (TBDs) include a range of multisystem diseases characterized by mucocutaneous symptoms and bone marrow failure. In dyskeratosis congenita (DKQ, the clinical features of TBDs stem from the depletion of crucial stem cell populations in highly proliferative tissues, resulting from abnormal telomerase function. Due to the wide spectrum of clinical presentations and lack of a conclusive laboratory test it may be challenging to reach a clinical diagnosis, especially if patients lack the pathognomonic clinical features of TBDs.

    Methods: Clinical sequencing was performed on a cohort of patients presenting with variable immune phenotypes lacking molecular diagnoses. Hypothesis-free whole-exome sequencing (WES) was selected in the absence of compelling diagnostic hints in patients with variable immunological and haematological conditions.

    Results: In four patients belonging to three families, we have detected five novel variants in known TBD-causing genes (DKC1, TERT and RTEL1). In addition to the molecular findings, they all presented shortened blood cell telomeres. These findings are consistent with the displayed TBD phenotypes, addressing towards the molecular diagnosis and subsequent clinical follow-up of the patients.

    Conclusions: Our results strongly support the utility of WES-based approaches for routine genetic diagnostics of TBD patients with heterogeneous or atypical clinical presentation who otherwise might remain undiagnosed.

    Download full text (pdf)
    fulltext
  • 46.
    Westin, Ida Maria
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Medical and Clinical Genetics.
    Landfors, Mattias
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Giannopoulos, Antonios
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB).
    Viberg, Andreas
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Ophthalmology.
    Osterman, Pia
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Byström, Berit
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Ophthalmology.
    Degerman, Sofie
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology. Umeå University, Faculty of Medicine, Department of Clinical Microbiology.
    Golovleva, Irina
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Medical and Clinical Genetics.
    DNA methylation changes and increased mRNA expression of coagulation proteins, factor V and thrombomodulin in Fuchs endothelial corneal dystrophy2023In: Cellular and Molecular Life Sciences (CMLS), ISSN 1420-682X, E-ISSN 1420-9071, Vol. 80, no 3, article id 62Article in journal (Refereed)
    Abstract [en]

    Late-onset Fuchs endothelial corneal dystrophy (FECD) is a disease affecting the corneal endothelium (CE), associated with a cytosine-thymine-guanine repeat expansion at the CTG18.1 locus in the transcription factor 4 (TCF4) gene. It is unknown whether CTG18.1 expansions affect global methylation including TCF4 gene in CE or whether global CE methylation changes at advanced age. Using genome-wide DNA methylation array, we investigated methylation in CE from FECD patients with CTG18.1 expansions and studied the methylation in healthy CE at different ages. The most revealing DNA methylation findings were analyzed by gene expression and protein analysis. 3488 CpGs had significantly altered methylation pattern in FECD though no substantial changes were found in TCF4. The most hypermethylated site was in a predicted promoter of aquaporin 1 (AQP1) gene, and the most hypomethylated site was in a predicted promoter of coagulation factor V (F5 for gene, FV for protein). In FECD, AQP1 mRNA expression was variable, while F5 gene expression showed a ~ 23-fold increase. FV protein was present in both healthy and affected CE. Further gene expression analysis of coagulation factors interacting with FV revealed a ~ 34-fold increase of thrombomodulin (THBD). THBD protein was detected only in CE from FECD patients. Additionally, we observed an age-dependent hypomethylation in elderly healthy CE.Thus, tissue-specific genome-wide and gene-specific methylation changes associated with altered gene expression were discovered in FECD. TCF4 pathological methylation in FECD because of CTG18.1 expansion was ruled out.

    Download full text (pdf)
    fulltext
1 - 46 of 46
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf