Summary
In this report, we present an analysis of glucose and insulin responses during oral glucose tolerance tests in 369 siblings of Type 1 diabetic patients. All have been HLA typed at the A, B and C loci. Though most had normal glucose tolerance by National Diabetes Data Group criteria (92% of the males and 95% of the females), siblings who shared both HLA haplotypes with the diabetic patient in the family had higher mean 3-hour glucose areas than those who shared one or neither HLA haplotype (p < 0.01). This difference was more marked in males and older siblings. Insulin concentrations did not differ significantly between the two groups except that, for those aged <16 years, the group sharing both haplotypes had lower fasting insulin concentrations (p = 0.05); for 16–29 year olds, the corresponding group had marginally higher 3-hour insulin areas than the remainder of siblings (p = 0.17). Little association with specific haplotypes (A1B8 or A2B15) was seen. Multivariate analyses, adjusting for age and obesity, eliminated the 3-h glucose difference in females by HLA sharing status (p = 0.37) although in males it remained significant (p < 0.001). Failure to account for age, sex and obesity may explain some of the conflicts in the reported literature. The glucose tolerance differences seen by HLA haplotype sharing status did not correlate with the presence of anti-islet cell antibodies. These results are consistent with the hypothesis that the HLA identical siblings, particularly males, have different (i. e. worse) glucose tolerance than their haplo-identical and non-HLA identical siblings.
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Orchard, T.J., Wagener, D.K., Rabin, B.S. et al. Glucose tolerance in siblings of Type 1 diabetic patients relationship to HLA status. Diabetologia 29, 39–45 (1986). https://doi.org/10.1007/BF02427279
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DOI: https://doi.org/10.1007/BF02427279