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Diabetes, Vol 49, Issue 12 2217-2221, Copyright © 2000 by American Diabetes Association
Non-class II HLA gene associated with type 1 diabetes maps to the 240-kb region near HLA-B
S Nejentsev, Z Gombos, AP Laine, R Veijola, M Knip, O Simell, O Vaarala, HK Akerblom and J Ilonen
Juvenile Diabetes Foundation Center for Type 1 Diabetes Prevention in Finland, Turku. serneje@utu.fi
Several studies provide evidence that in addition to the DQ-DR genes, HLA
contains another uncharacterized gene or genes associated with type 1
diabetes. Our aim was to investigate the effect of this gene independently
of the DQ-DR genes and to localize it with a matched case-control study.
More than 1,400 patients and 30,000 control individuals from Finland were
studied. They were first genotyped for the selected alleles of the
HLA-DQB1, -DQA1, and -DRB1 genes. For the DR3/4(0404) genotype, 75 patients
and 181 control subjects were stratified, and 241 patients and 354 controls
were stratified for the DR3/4(0401) genotype. Ten microsatellite markers in
the HLA class III and I regions (D6S273, TNFa, C12A, STR MICA, MIB, C125,
C143, C245, C3211, and MOGc) and selected alleles of the HLA-A and HLA-B
genes were studied. In the DR3/4(0404)-stratified group, we found that
markers located between C12A and C143 near the HLA-B gene confer a strong
additional diabetes association. This was confirmed by the population
differentiation test in both DR3/4(0404)- and DR3/4(0401)-stratified
groups. Our data indicate that an additional gene associated with type 1
diabetes is located in the 240-kb region near HLA-B. We excluded STR MICA
polymorphism as a mutation responsible for diabetes association.

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Copyright © 2000 by the American Diabetes Association.
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