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Effect of gene conversion on polymorphic patterns at major histocompatibility complex loci.

T Ohta1

  • 1Department of Population Genetics, National Institute of Genetics, Mishima, Japan. tohta@lab.nig.ac.jp

Immunological Reviews
|May 13, 1999
PubMed
Summary

Computer simulations reveal that non-allelic gene conversion is less common in human Major Histocompatibility Complex (MHC) genes than in other mammals. Allelic conversion rates, however, remain high in human MHC genes.

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Area of Science:

  • Population Genetics
  • Molecular Evolution
  • Immunogenetics

Background:

  • The Major Histocompatibility Complex (MHC) is crucial for immune response and exhibits high polymorphism.
  • Understanding the evolutionary forces shaping MHC polymorphism, such as gene conversion, is vital.

Purpose of the Study:

  • To investigate the impact of allelic and non-allelic gene conversion on polymorphism patterns at MHC loci.
  • To compare simulated patterns with observed DNA sequence data in mammals, particularly humans.

Main Methods:

  • Computer simulations modeling overdominance and short-term selection with varying gene conversion rates.
  • DNA sequence analysis focusing on synonymous and non-synonymous divergence within MHC alleles.
  • Quantitative analysis of sequence patterns using identity excess among nucleotide sites.

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Main Results:

  • Increased non-allelic gene conversion frequency reduces the ratio of non-synonymous to synonymous divergence among alleles.
  • Non-allelic conversion increases synonymous divergence at antigen recognition sites relative to non-coding regions.
  • Simulations suggest a higher rate of allelic gene conversion compared to non-allelic conversion in human MHC genes.

Conclusions:

  • Non-allelic gene conversion appears less frequent in human MHC genes than in other mammalian species.
  • Allelic gene conversion plays a significant role in shaping human MHC polymorphism.
  • The study provides insights into the evolutionary dynamics of immune system genes.