DR- and DQ-Associated Protection from Type 1A Diabetes: Comparison of DRB111401 and DQA110102-DQB1106021

• Published in: The journal of clinical endocrinology and metabolism Vol. 85; no. 10; pp. 3793 - 3797
• Main Authors: Redondo, M. J., Kawasaki, E., Mulgrew, C. L., Noble, J. A., Erlich, H. A., Freed, B. M., Lie, B. A., Thorsby, E., Eisenbarth, G. S., Undlien, D. E., Ronningen, K. S.
• Format: Journal Article
• Language: English
• Published: Endocrine Society 01-10-2000
• ISSN: 0021-972X; 1945-7197
• DOI: 10.1210/jcem.85.10.6920

The transmission disequilibrium test was used to analyze
haplotypes for association and linkage to diabetes within families from
the Human Biological Data Interchange type 1 diabetes
repository (n = 1371 subjects) and from the Norwegian Type 1
Diabetes Simplex Families study (n = 2441 subjects).
DQA1*0102-DQB1*0602 was transmitted to 2 of 313 (0.6%) affected
offspring (P < 0.001, vs. the
expected 50% transmission). Protection was associated with the DQ
alleles rather than DRB1*1501 in linkage disequilibrium with
DQA1*0102-DQB1*0602: rare DRB1*1501 haplotypes without
DQA1*0102-DQB1*0602 were transmitted to 5 of 11 affected offspring,
whereas DQA1*0102-DQB1*0602 was transmitted to 2 of 313 affected
offspring (P < 0.0001). Rare DQA1*0102-DQB1*0602
haplotypes without DRB1*1501 were never transmitted to affected
offspring (n = 6).
The DQA1*0101-DQB1*0503 haplotype was transmitted to 2 of 42 (4.8%)
affected offspring (P < 0.001, vs.
50% expected transmission). Although DRB1*1401 is in linkage
disequilibrium with DQB1*0503, neither of the two affected children who
carried DQA1*0101-DQB1*0503 had DRB1*1401. However, all 13 nonaffected
children who inherited DQA1*0101-DQB1*0503 had DRB1*1401. In a
case-control comparison of patients from the Barbara Davis Center,
DQA1*0101-DQB1*0503 was found in 5 of 110 (4.5%) controls compared
with 3 of 728 (0.4%) patients (P < 0.005). Of the
three patients with DQB1*0503, only one had DRB1*1401. Our data suggest
that both DR and DQ molecules (the DRB1*1401 and DQA1*0102-DQB1*0602
alleles) can provide protection from type 1A diabetes.