A Genetic Analysis of Type 2 (Non-insulin-dependent) Diabetes Mellitus in Punjabi Sikhs and British Caucasoid Patients
A genetic analysis of diabetic and non-diabetic Punjabi Sikhs (n = 164) was made for markers of non-insulin-dependent diabetes mellitus using insulin receptor, insulin, and HLA-D alpha chain gene probes. Additionally British Caucasoids (n = 163) were studied using the insulin receptor probe. Insulin receptor gene restriction fragment length polymorphisms were defined using Southern blot techniques and the restriction enzyme Bgl II and BAm Hl. In Punjabi Sikhs and British Caucasoids neither of the restriction fragment length polymorphisms distinguished non-insulin-dependent diabetes mellitus subjects from controls. In the Sikhs no association with non-insulin-dependent diabetes mellitus was seen with the hypervariable region of the insulin gene or with HLA-DR/DQ/DX alpha chain restriction fragment length polymorphisms. We therefore conclude that despite the high prevalence of non-insulin-dependent diabetes mellitus in Asians we were unable to find any genetic markers for this disease using the available cloned gene probes.
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