Human leukocyte antigen non-class II determinants for type 1 diabetes in the Finnish population.
We explored the contribution of non-class II HLA loci to type 1 diabetes genetic susceptibility in the Finnish population. We analyzed 11 markers covering a 4-Mb region telomeric to the DQB1 gene in Finnish nuclear families with parents carrying either the DR8-DQB1*04 (n=188) or the DRB1*0404-DQB1*0302 haplotypes (n=135). On the DRB1*0404-DQB1*0302 haplotype we found independent disease association of the D6S273 and C125 markers (p(corr) = 10(-4) and 0.0095, respectively). The C125*200 alleles on this haplotype conferred an increased disease risk (OR = 3.6; p = 0.003). The B*39 allele also showed disease association (OR = 2.6; p = 0.054). The C125*200 allele appeared at an increased frequency also on transmitted B39 positive DRB1*0404-DQB1*0302 haplotypes, suggesting an independent effect. In addition, the C143*417 allele on the DRB1*08-DQB1*04 haplotype was associated with decreased disease risk (OR = 0.48, p = 0.003). Our data confirm that non-class II HLA loci affect genetic susceptibility to type 1 diabetes. In addition to HLA B*39 the C125 locus contributes to disease risk on the Finnish DRB1*0404-DQB1*0302 haplotypes. Another locus close to D6S273 may also have an effect. For the first time we report that a locus near the C143 marker appear to affect disease association of the DRB1*08-DQB1*04 haplotype.
Gombos
Zsofia
Z
Immunogenetics Laboratory, University of Turku, Turku, Finland. zsofia.gombos@utu.fi
Wachowicz
Joanna
J
Veijola
Riitta
R
Akerblom
Hans K
HK
Simell
Olli
O
Knip
Mikael
M
Ilonen
Jorma
J
Hermann
Robert
R
D000483:Alleles; D003922:Diabetes Mellitus, Type 1 / Q000235:genetics*; D005260:Female; D005387:Finland / Q000453:epidemiology; D020022:Genetic Predisposition to Disease; D006680:HLA Antigens / Q000235:genetics*; D006239:Haplotypes; D006801:Humans; D015810:Linkage Disequilibrium; D008297:Male; D018895:Microsatellite Repeats; D010375:Pedigree; D016133:Polymerase Chain Reaction
D006680:HLA Antigens