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Related Experiment Video

Updated: Jan 7, 2026

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Widespread gene conversion in centromere cores.

Jinghua Shi1, Sarah E Wolf, John M Burke

  • 1Department of Plant Biology, University of Georgia, Athens, Georgia, United States of America.

Plos Biology
|March 17, 2010
PubMed
Summary
This summary is machine-generated.

Gene conversion, a non-crossover exchange, drives centromere evolution in maize by facilitating sequence exchange. This mechanism helps explain the diversity found in these typically static genomic regions.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Genomics

Background:

  • Centromeres exhibit high genomic dynamism but low crossing over, posing a challenge to understanding their evolutionary origins.
  • The mechanisms driving centromere diversity despite suppressed recombination remain largely unexplained.

Purpose of the Study:

  • To investigate novel mechanisms driving centromere evolution and sequence diversity.
  • To map kinetochore interactions within centromeric regions.

Main Methods:

  • Development of a novel CENH3 Chromatin Immunoprecipitation (ChIP) display method.
  • Mapping of within-centromere markers using maize recombinant inbred lines.
  • Population genetic analysis of diverse maize inbreds.

Main Results:

  • Successfully mapped 238 within-centromere markers, with over half interacting directly with kinetochores (CENH3).
  • Identified two gene conversion events, a form of non-crossover exchange, within CENH3 domains where crossing over is suppressed.
  • Population genetic analysis indicated widespread historical gene conversion in maize centromeres at a rate exceeding 1x10(-5)/marker/generation.

Conclusions:

  • Gene conversion is a significant driver of centromere evolution in maize.
  • This non-crossover exchange mechanism facilitates sequence exchange, contributing to centromere diversity.
  • Gene conversion provides a plausible explanation for the evolutionary dynamics of centromeres.