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Original Articles

New Susceptibility Locus for NIDDM Is Localized to Human Chromosome 20q

  1. Linong Ji,
  2. Maciek Malecki,
  3. James H Warram,
  4. Yadong Yang,
  5. Stephen S Rich and
  6. Andrzej S Krolewski
  1. Research Division, Joslin Diabetes Center Boston, Massachusetts
  2. Department of Medicine, Harvard Medical School Boston, Massachusetts
  3. Department of Epidemiology, Harvard School of Public Health Boston, Massachusetts
  4. Department of Public Health Sciences, Bowman Gray School of Medicine Winston-Salem, North Carolina
  1. Address correspondence and reprint requests to Dr. Andrzej S. Krolewski, Section on Epidemiology and Genetics, Joslin Diabetes Center, One Joslin Place, Boston, MA 02215–5397.
Diabetes 1997 May; 46(5): 876-881. https://doi.org/10.2337/diab.46.5.876
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Abstract

To test the hypothesis that a gene (or genes) in the “MODY1 region” of the long arm of chromosome 20 contributes to the development of NIDDM, we conducted linkage studies in 29 extended Caucasian families in which many members were affected with NIDDM. A total of 498 individuals, including 159 NIDDM patients with an average age at diagnosis of 47 years, were genotyped for eight highly polymorphic microsatellite markers spanning a 31-cM region on chromosome 20q12–13.1. Using affected sib-pair analysis, we obtained evidence suggesting linkage between NIDDM and markers D20S119, D20S178, and D20S197 (allele sharing identical-by-descent [IBD], 0.56 for all three; P = 0.005, P = 0.009, and P = 0.004, respectively). Multipoint nonparametric linkage (NPL) analysis also showed evidence for linkage of NIDDM with the same three markers. The evidence for linkage was much stronger (allele sharing IBD by affected sibpairs, 0.64 [P < 0.0001]; maximum NPL score, 3.3 [P = 0.009]) in the 14 families whose average age at diagnosis of NIDDM was above the median (47 years) for all families. In these 14 families, one particular allele of the microsatellite D20S197 was transmitted from heterozygous parents to NIDDM offspring more frequently than expected (P < 0.01). This indicates that the marker allele and the disease allele are in linkage disequilibrium, implying that they are in close proximity. Consequently, the recently identified MODY1 gene (hepatocyte nuclear factor 4) is an unlikely candidate gene for NIDDM in our families, since it is located about 8 cM centromeric of D20S197. In conclusion, we have identified a new region on chromosome 20q that contains one or more NIDDM genes distinct from the recently identified MODY1 gene.

  • Received May 10, 1996.
  • Revision received January 15, 1997.
  • Accepted January 15, 1997.
  • Copyright © 1997 by the American Diabetes Association

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May 1997, 46(5)
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New Susceptibility Locus for NIDDM Is Localized to Human Chromosome 20q
Linong Ji, Maciek Malecki, James H Warram, Yadong Yang, Stephen S Rich, Andrzej S Krolewski
Diabetes May 1997, 46 (5) 876-881; DOI: 10.2337/diab.46.5.876

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New Susceptibility Locus for NIDDM Is Localized to Human Chromosome 20q
Linong Ji, Maciek Malecki, James H Warram, Yadong Yang, Stephen S Rich, Andrzej S Krolewski
Diabetes May 1997, 46 (5) 876-881; DOI: 10.2337/diab.46.5.876
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