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Diabetes, Vol 47, Issue 11 1793-1796, Copyright © 1998 by American Diabetes Association
Novel susceptibility gene for late-onset NIDDM is localized to human chromosome 12q
JT Shaw, PK Lovelock, JB Kesting, J Cardinal, D Duffy, B Wainwright and DP Cameron
Department of Diabetes and Endocrinology, Princess Alexandra Hospital, Brisbane, Queensland, Australia.
NIDDM has a substantial genetic component, but the nature of the genetic
susceptibility is largely unknown. Maturity-onset diabetes of the young
(MODY) is a genetically heterogeneous monogenic form of NIDDM characterized
by an early age of onset and autosomal dominant inheritance, and linkage
studies have identified genes that are mutated in different MODY pedigrees
on chromosome 20 (MODY1 locus, hepatocyte nuclear factor-4alpha
[HNF-4alpha] gene), chromosome 7 (MODY2 locus, glucokinase gene), and
chromosome 12 (MODY3 locus, HNF-1alpha gene). We studied an extended
pedigree in which multiple members are affected by late-onset NIDDM
associated with insulin resistance and performed linkage analysis with four
microsatellite markers in the MODY3 region of chromosome 12q. We found
significant evidence for linkage between NIDDM and the MODY3 locus
(logarithm of odds score 3.65 at theta = 0.008 telomeric to marker
D12S321), but sequencing of the 10 exons and promoter of HNF-1alpha did not
identify any causative mutation in this gene. Our results indicate that the
region of chromosome 12q close to MODY3 harbors a novel susceptibility gene
or genes for NIDDM.

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Copyright © 1998 by the American Diabetes Association.
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