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Expression of BCR-ABL1 oncogene relative to ABL1 gene changes overtime in chronic myeloid leukemia.
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2008 (English)In: Biochemical and biophysical research communications, ISSN 1090-2104, Vol. 366, no 3, 848-51 p.Article in journal (Refereed) Published
Abstract [en]

Using a quantitative single nucleotide polymorphism (SNP) assay we have investigated the changes in the expression of the BCR-ABL1 oncogene relative to the wild-type ABL1 and BCR alleles in cells from chronic myeloid leukemia (CML) patients not responding to therapy. The results show a progressive increase in the BCR-ABL1 oncogene expression at the expense of decreased expression of the ABL1 allele, not involved in the fusion. No relative changes in the expression of the two BCR alleles were found. These results demonstrate that allele-specific changes in gene expression, with selective, progressive silencing of the wild-type ABL1 allele in favor of the oncogenic BCR-ABL1 allele occur in CML patients with therapy-resistant disease.

Place, publisher, year, edition, pages
2008. Vol. 366, no 3, 848-51 p.
URN: urn:nbn:se:umu:diva-19480DOI: 10.1016/j.bbrc.2007.12.029PubMedID: 18082628OAI: diva2:201834
Available from: 2009-03-05 Created: 2009-03-05 Last updated: 2016-08-19
In thesis
1. Gene Expression in Cancer Cells: Detection of Splice Variants, Allele-specific Expression and DNA Methylation
Open this publication in new window or tab >>Gene Expression in Cancer Cells: Detection of Splice Variants, Allele-specific Expression and DNA Methylation
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The human genome sequencing project has provided a wealth of information on sequence variation between individuals. The surprisingly low number of genes in the human genome is compensated for by a complex regulation of gene expression. New methods are now being developed for the discovery and analysis of the regulatory regions of the genome to elucidate factors that affect both normal and disease-associated human genetic variation. In parallel with identification of DNA sequence variation, efforts are being made to unravel the next layer of information - epigenetic modifications of the genome. The studies in this thesis describe the application of methods for genotyping single nucleotide polymorphisms (SNPs) in DNA for the analysis of gene transcripts in cancer cells. We performed quantitative analysis of splice variants and screened for allele-specific gene expression (ASE) in cancer cells using the tag-microarray based minisequencing system. This analysis revealed transcript isoforms that were differentially spliced in leukemia cell lines and normal endothelial cell lines. We detected wide-spread allele-specific gene expression in cancer cells that were sensitive or resistant to anti-cancer drugs. In regulatory regions of the genes with ASE we identified putative regulatory SNPs. Using technology developed for large-scale SNP genotyping, we screened for ASE in an internationally unique collection of childhood acute lymphoblastic leukemia (ALL) samples. Analysis of DNA methylation in promoter regions of genes displaying ASE revealed genes, whose expression is regulated by allele-specific DNA methylation. For a subset of these genes we found a correlation between DNA methylation levels and probability of disease-free survival in ALL patients with different chromosomal aberrations. The methylation patterns that we identified constitute excellent candidate markers for subtyping of ALL patients and for stratification of ALL patients based on their probability of disease-free survival and response to drug treatment. The results of this study have increased our understanding of epigenetic changes in ALL cells and will hopefully help to design better treatment plans for the patients to avoid over-treatment and unnecessary side effects.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2009. 57 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine, ISSN 1651-6206 ; 433
urn:nbn:se:uu:diva-99067 (URN)978-91-554-7449-2 (ISBN)
Public defence
2009-04-17, Rudbecksalen, Rudbeck Laboratoriet, Uppsala, 13:00 (English)
Available from: 2009-03-27 Created: 2009-03-06 Last updated: 2009-03-27Bibliographically approved

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