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CRYAB-650 C>G (rs2234702) affects susceptibility to type 1 diabetes and IAA-positivity in Swedish population
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2012 (English)In: Human Immunology, ISSN 0198-8859, E-ISSN 1879-1166, Vol. 73, no 7, 759-766 p.Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Single nucleotide polymorphisms (SNPs) in the promoter region of CRYAB gene have been associated with in multiple sclerosis. CRYAB gene, which encodes alpha B-crystallin (a member of small heat shock protein), was reported as a potential autoimmune target. In this study we investigated whether SNPs in the promoter region of CRYAB gene were also important in the etiology of Type 1 diabetes (T1D).

METHODS: Genotyping of SNPs in the promoter region of CRYAB gene was performed in a Swedish cohort containing 444 T1D patients and 350 healthy controls. Three SNPs were included in this study: CRYAB-652 A>G (rs762550), -650 C>G (rs2234702) and -249 C > G (rs14133). Two SNPs (CRYAB-652 and -650) were not included in previous genome wide association studies.

RESULTS: CRYAB-650 (rs2234702)*C allele was significantly more frequent in patients than in controls (OR = 1.48, Pc = 0.03). CRYAB-650*C allele was associated with IAA positivity (OR = 8.17, Pc < 0.0001) and IA-2A positivity (OR = 2.14, Pc = 0.005) in T1D patients. This association with IAA was amplified by high-risk HLA carrier state (OR = 10.6, P < 0.0001). No association was found between CRYAB-650 and other autoantibody positivity (GADA and ICA). CRYAB haplotypes were also associated with IAA and IA-2A positivity (highest OR = 2.07 and 2.11, respectively), these associations remain in high HLA-risk T1D patients.

CONCLUSIONS: CRYAB-650 was associated with T1D in the Swedish cohort we studied. CRYAB-650*C allele might confers susceptibility to the development of T1D. CRYAB-650 was also associated with the development of IAA-positivity in T1D patients, especially in those carrying T1D high-risk HLA haplotypes.

Place, publisher, year, edition, pages
Elsevier, 2012. Vol. 73, no 7, 759-766 p.
Keyword [en]
Autoimmunity, CRYAB, Haplotype, Type 1 diabetes, Swedish
National Category
Endocrinology and Diabetes
URN: urn:nbn:se:umu:diva-101468DOI: 10.1016/j.humimm.2012.04.004ISI: 000305775800013PubMedID: 22537749OAI: diva2:799559
Available from: 2015-03-31 Created: 2015-03-31 Last updated: 2015-08-14Bibliographically approved

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Eriksson, JanNyström, LennarthHolmberg, EDahlquist, Gisela
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