We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Combined positivity forHLA DQ2/DQ8and IA-2 antibodies defines population at high risk of developing type 1 diabetes.
- Authors
Decochez, K.; Truyen, I.; Auwera, B.; Weets, I.; Vandemeulebroucke, E.; Leeuw, I.; Keymeulen, B.; Mathieu, C.; Rottiers, R.; Pipeleers, D.; Gorus, F.
- Abstract
Aims/hypothesis: Prevention trials in first-degree relatives of type 1 diabetic patients are hampered by large interindividual differences in progression rate to diabetes. We investigated whether specific combinations of immune and genetic markers can identify subgroups with more homogeneous progression to clinical onset. Methods: Antibodies against islet cell cytoplasm (ICA), insulin (IAA), glutamate decarboxylase (GADA) and IA-2 protein (IA- 2A) were measured in 790 non-diabetic control subjects and 4,589 first-degree relatives under age 40. Results: On first sampling, 11.1% of the siblings presented at least one anti- body type (p<0.001 vs other relatives). During follow-up (median 52 months) 43 subjects developed type 1 diabetes (31 siblings, ten offspring of a diabetic father, two offspring of a diabetic mother). Using Kaplan-Meier survival anal- ysis and Cox regression, IA-2A conferred the highest 5-year diabetes risk (>50%) irrespective of the number of anti- bodies present. In initially JA-2A-positive relatives (n=58) progression to hyperglycaemia depended more on HLA DQ status than on type of kinship (84% progression in the presence of DQ2/DQ8 vs 32% in its absence; p<O.003). In IA-2A-negative relatives (n=4,531) 5-year progres- sion to diabetes increased with the number of other antibodies (ICA, GADA and/or IAA) (p<0.001) but overall did not exceed 10% even for two or more antibodies. Among relatives initially positive for one or more antibody type other than IA-2A (n=3 15), there was significantly more progression to diabetes (overall still <10%) in carriers of DQ2 (p<0.001 vs no DQ2), regardless of DQ8 status. Conclusions/interpretation: These observations suggest that the HLA-DQ-inferred risk of diabetes can proceed through two distinct pathways distinguished by IA-2A status. Combined positivity for DQ2/DQ8 and IA-2A defines a more homogeneous high-risk population for prevention trials than those used so far.
- Subjects
GLUTAMATE decarboxylase; AUTOANTIBODIES; ISLANDS of Langerhans; GENETIC markers; PEOPLE with diabetes; DIABETES
- Publication
Diabetologia, 2005, Vol 48, Issue 4, p687
- ISSN
0012-186X
- Publication type
Article
- DOI
10.1007/s00125-005-1702-x