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The evolution of genomic imprinting

A Mochizuki1, Y Takeda, Y Iwasa

  • 1Department of Biology, Faculty of Science, Kyushu University, Fukuoka, Japan. amochscb@mbox.nc.kyushu-u.ac.jp

Genetics
|November 1, 1996
PubMed
Summary

Genomic imprinting, where gene alleles differ by parental origin, evolves readily with multiple mating. However, mutations against imprinting suggest a complex evolutionary path for imprinted genes.

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Area of Science:

  • Evolutionary genetics
  • Developmental biology
  • Genomics

Background:

  • Genomic imprinting involves differential expression of parental alleles in mammals.
  • The genetic conflict hypothesis posits imprinting arises from allele conflicts.
  • Imprinted genes regulate embryonic growth and resource acquisition.

Purpose of the Study:

  • To investigate the evolution of genomic imprinting using quantitative genetic models.
  • To test the feasibility of the genetic conflict hypothesis for imprinting.
  • To explore factors influencing the evolution and maintenance of imprinting.

Main Methods:

  • Multivariate quantitative genetic modeling.
  • Analysis of a zygotic gene controlling embryonic growth factor production.
  • Simulation of gene expression based on parental origin.

Main Results:

  • Genomic imprinting evolves readily under conditions of female multiple partners.
  • The model predicts imprinting is easily lost due to deleterious mutations.
  • Discrepancies exist between model predictions and observed imprinting patterns.

Conclusions:

  • The genetic conflict hypothesis is plausible but requires refinement.
  • Factors beyond simple genetic conflict, like mutation load, shape imprinting evolution.
  • Imprinting patterns are dynamic and influenced by multiple evolutionary pressures.

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