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Diabetes, Vol 46, Issue 4 688-694, Copyright © 1997 by American Diabetes Association
Genetic studies of the sulfonylurea receptor gene locus in NIDDM and in morbid obesity among French Caucasians
EH Hani, K Clement, G Velho, N Vionnet, J Hager, A Philippi, C Dina, H Inoue, MA Permutt, A Basdevant, M North, F Demenais, B Guy-Grand and P Froguel
CNRS EP 10, Institut Pasteur and C.H.R.U., Lille, France.
The sulfonylurea receptor (SUR) is a key component in glucose-stimulated
insulin secretion. Obesity and NIDDM are frequently associated and share
some metabolic abnormalities, suggesting that they might also share some
susceptibility genes. Thus, the SUR encoding gene is a plausible candidate
for a primary pancreatic beta-cell defect and thus for hyperglycemia and
weight gain. Through association and linkage studies, we have investigated
the potential role of the SUR gene in families with NIDDM and in two
independent sets of morbidly obese families. The exon 22 T-allele at codon
761 was more common in patients with NIDDM (7.7%) and morbid obesity (7.8%)
than in control subjects (1.8%, P = 0.030 and P = 0.023, respectively).
This variant was associated with morbid obesity (odds ratio 3.71, P =
0.017) and NIDDM (odds ratio 2.20, P = 0.04; association dependent on BMI).
Although the frequencies for intron 24 variant were similar in all groups,
morbidly obese patients homozygous for the c-allele had a more deleterious
form of obesity. Sib-pair linkage studies with NIDDM in French Caucasian
families gave no evidence for linkage to the SUR locus. However, in one set
of the obese families, we found an indication for linkage with a SUR-linked
microsatellite marker (D11S419, P = 0.0032). We conclude that in
Caucasians, the SUR locus may contribute to the genetic susceptibility to
NIDDM and obesity.

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Copyright © 1997 by the American Diabetes Association.
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