title: Polymorphic variant at the IL2 region is associated with type 1 diabetes and may affect serum levels of interleukin-2.
abstract: Polymorphic variants at the interleukin-2 (IL2) locus affect the risk of several autoimmune disorders. Our aim was to evaluate the association of the four IL2 polymorphisms (rs6822844, rs6534349, rs2069762 and rs3136534) with type 1 diabetes (T1D) in the Polish population, and to correlate them with the serum interleukin-2 levels. 543 unrelated T1D patients and 706 healthy control subjects were enrolled. The minor T allele at rs6822844 was significantly less frequent in T1D compared to controls (p = 0.002; OR 0.71; 95 % CI 0.571-0.880). Likewise, the frequency of the TT genotype was decreased among the affected individuals (p = 0.007). In healthy subjects, stratification according to the rs6822844 genotype revealed significant differences in circulating interleukin-2 (p = 0.037) with the highest levels in TT protective genotypes. Three other IL2 polymorphisms did not display significant differences in allele and genotype distribution. In conclusion, the rs6822844 variant is associated with T1D and may play a functional role, or reflect the influence of another causative genetic variant in linkage disequilibrium.
authors.affiliation: Institute of Human Genetics, Polish Academy of Sciences, 32 Strzeszynska, 60-479, Poznan, Poland, mfichna@man.poznan.pl.
authors.forename: Marta
authors.initials: M
authors.lastname: Fichna
authors.forename: Magdalena
authors.initials: M
authors.lastname: Zurawek
authors.forename: Piotr
authors.initials: P
authors.lastname: Fichna
authors.forename: Iwona
authors.initials: I
authors.lastname: Ziółkowska-Suchanek
authors.forename: Danuta
authors.initials: D
authors.lastname: Januszkiewicz
authors.forename: Jerzy
authors.initials: J
authors.lastname: Nowak
mesh_terms: D000483:Alleles; D016022:Case-Control Studies; D002648:Child; D003922:Diabetes Mellitus, Type 1 / Q000097:blood* / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease; D060005:Genotyping Techniques; D006801:Humans; D007376:Interleukin-2 / Q000097:blood* / Q000235:genetics*; D008297:Male; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*
chemical_list: C508594:IL2 protein, human; D007376:Interleukin-2