Association Analysis of the AIRE and Insulin Genes in Finnish Type 1 Diabetic Patients

Overview

Journal Immunogenetics

Specialties Allergy & Immunology
Genetics

Date 2006 Mar 23

PMID 16552513

Citations 12

Authors

Joni A Turunen

Maija Wessman

Carol Forsblom

Riika Kilpikari

Maija Parkkonen

Nora Pontynen

Tanja Ilmarinen

Ismo Ulmanen

Leena Peltonen

Per-Henrik Groop

Affiliations

Soon will be listed here.

Abstract

Mutations in the autoimmune regulator (AIRE) gene cause a recessive Mendelian disorder autoimmune polyendocrinopathy syndrome type 1 (APS-1 or autoimmune polyendocrinopathy-candidiasis-ectodermal dystrophy). APS-1 patients develop multiorgan autoimmune diseases including type 1 diabetes (prevalence 12%). The AIRE protein controls the central tolerance induction in the thymus by regulating the expression levels of tissue-specific peripheral antigens, such as insulin. We hypothesized that the insulin gene (INS) polymorphisms together with the AIRE variations may predispose individuals to diabetes. The role of the AIRE gene was tested both independently and on the condition of the INS risk genotype in the Finnish type 1 diabetes sample. A total of 733 type 1 diabetic cases and 735 age- and sex-matched healthy controls were used in the analysis. Five common single nucleotide polymorphisms (SNPs) in the AIRE gene were selected from the public database (dbSNP). The -23HphI polymorphism was used as a surrogate marker for the INS gene promoter repeat. The five genotyped SNPs in the AIRE gene showed no evidence of association with type 1 diabetes. As expected, the INS gene polymorphism -23HphI was significantly associated with susceptibility to type 1 diabetes (P=6.8 x 10(-12), chi(2) test). When the subclass of patients carrying the homozygote genotype of the INS gene was used in the analysis, the AIRE polymorphisms showed no association with the disease. In conclusion, the AIRE gene does not seem to contribute to disease susceptibility in Finnish type 1 diabetic patients, whereas the insulin gene represents a notable risk factor for disease in this population.

Citing Articles

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