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Diabetes, Vol 48, Issue 11 2246-2251, Copyright © 1999 by American Diabetes Association

ARTICLES

Evidence of a novel type 2 diabetes locus 50 cM centromeric to NIDDM2 on chromosome 12q

A Bektas, ME Suprenant, LT Wogan, N Plengvidhya, SS Rich, JH Warram, AS Krolewski and A Doria
Section on Genetics and Epidemiology, Research Division, Joslin Diabetes Center, Boston, Massachusetts 02215, USA.

To replicate the recent finding of a type 2 diabetes locus (NIDDM2) on 12q, families segregating early-onset autosomal-dominant type 2 diabetes were screened for linkage. Included were 26 Caucasian and 6 non-Caucasian pedigrees with an average age at diabetes diagnosis of 37 +/- 18 years. Affected (n = 233) and nonaffected (n = 152) family members were genotyped for 17 markers covering 90 cM on chromosome 12q. While no evidence for linkage was detected at the NIDDM2 locus, a linkage peak was observed 50 cM centromeric to NIDDM2 at markers D12S375 and D12S1052. In a nonparametric analysis, the Z(all) score was 2.9 (P = 0.015) at D12S375, and increased to 3.8 (P = 0.007) among Caucasian families. Further increase in significance was observed in pedigrees with poor insulin response, with a maximum Z(all) of 6.2 (P = 0.002) at D12S375. Suggestive evidence of linkage was also detected by the parametric analysis, with the heterogeneity logarithm of odds score peaking at 2.5 (alpha = 0.15) between D12S375 and D12S1052. In summary, our data indicate that the NIDDM2 locus does not play a major role in early-onset autosomal-dominant type 2 diabetes. Rather, they strongly suggest that a previously undetected type 2 diabetes locus exists 50 cM from NIDDM2 on 12q.
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