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Mapping genes in diabetes. Genetic epidemiological perspective.

S S Rich1

  • 1Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis.

Diabetes
|November 1, 1990
PubMed
Summary

Mapping diabetes susceptibility genes requires specific conditions. While insulin-dependent diabetes mellitus (IDDM) genetics are complex, research on non-insulin-dependent diabetes mellitus (NIDDM) gene mapping shows promising advancements.

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Area of Science:

  • Genetics
  • Endocrinology
  • Epidemiology

Background:

  • Genetic mapping of diabetes susceptibility relies on factors like major genes, genetic homogeneity, and available clinical data.
  • Detecting susceptibility genes depends on familial risk and marker proximity.

Purpose of the Study:

  • To review the challenges and prospects of mapping susceptibility genes for insulin-dependent diabetes mellitus (IDDM) and non-insulin-dependent diabetes mellitus (NIDDM).

Main Methods:

  • Analysis of genetic models for IDDM and NIDDM risk.
  • Review of factors influencing gene mapping power, including familial risk and genetic marker distance.

Main Results:

  • IDDM risk models best fit a single major locus with polygenic factors, likely involving the HLA complex.
  • Mapping polygenic IDDM factors is challenging due to their small effects.
  • NIDDM risk models suggest a few genes of moderate effect, but significant polygenic variation and heterogeneity exist.
  • Gene mapping for NIDDM susceptibility is becoming more promising.

Conclusions:

  • The genetic architecture of IDDM is largely characterized, with ongoing challenges in mapping minor susceptibility factors.
  • Significant progress is anticipated in identifying NIDDM susceptibility genes due to improved modeling and promising prospects.

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