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Allelic association between marker loci

C Lonjou1, A Collins, N E Morton

  • 1Human Genetics, University of Southampton, Level G, Princess Anne Hospital, Coxford Road, Southampton SO16 5YA, United Kingdom.

Proceedings of the National Academy of Sciences of the United States of America
|February 17, 1999
PubMed
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Allelic association is valuable for gene mapping but less so for complex traits. Kinship theory reveals that population founders, not later demographics, primarily influence association, with isolates being less informative for genetic studies.

Area of Science:

  • Population genetics
  • Statistical genetics
  • Genomic research

Background:

  • Allelic association aids in pinpointing major genes before positional cloning.
  • Its utility in genome scans for complex inheritance remains uncertain.

Purpose of the Study:

  • Extend kinship theory to quantify information content for linkage and allelic association.
  • Evaluate the impact of population history and structure on allelic association.

Main Methods:

  • Applied extended kinship theory to analyze information content.
  • Used closely linked markers as a proxy for marker x oligogene interactions.
  • Examined demographic factors like founder effects and population size.

Main Results:

Related Experiment Videos

  • Allelic association is predominantly shaped by regional founders, with minimal influence from subsequent demographic changes.
  • Sub-Saharan Africa exhibits the lowest allelic association, aligning with founder effects in other regions.
  • Theoretical and empirical data do not support the notion that isolates offer advantages over large populations for genetic studies.

Conclusions:

  • Allelic association is primarily determined by early demographic events (founder effects).
  • Isolates are generally less informative for both linkage and allelic association studies compared to larger, admixed populations.
  • Population structure significantly impacts the effectiveness of genetic association studies.