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Related Experiment Videos

​Plant centromeres​.

Luca Comai1, Shamoni Maheshwari1, Mohan P A Marimuthu1

  • 1Department of Plant Biology and Genome Center, University of California Davis, Davis, CA 95616, USA.

Current Opinion in Plant Biology
|April 16, 2017
PubMed
Summary
This summary is machine-generated.

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Plant centromeres exhibit diverse structures and evolve rapidly, influenced by epigenetic factors like centromeric histone 3 (CENH3). These dynamic elements can lead to genome instability and hybridization barriers.

Area of Science:

  • Genetics
  • Epigenetics
  • Plant Biology

Background:

  • Plant centromeres, epigenetically marked by centromeric histone 3 (CENH3), display significant structural diversity (monocentric, polycentric, holocentric).
  • Centromere positions are generally stable but can shift during evolution or under genomic stress, such as chromosome breakage.
  • Centromeric DNA can be single-copy or repetitive, with rapid sequence and CENH3 protein evolution posing an evolutionary puzzle due to a lack of co-adaptation evidence.

Purpose of the Study:

  • To explore the structural diversity and epigenetic determination of plant centromeres.
  • To investigate the evolutionary dynamics of centromeric sequences and CENH3.
  • To understand the role of epigenetic differences in centromere function and reproductive isolation.

Main Methods:

Related Experiment Videos

  • Analysis of centromere structures across diverse plant species.
  • Epigenetic studies focusing on centromeric histone 3 (CENH3) localization and function.
  • Comparative genomics to assess the evolution of centromeric DNA and CENH3 protein.

Main Results:

  • Plant centromeres show remarkable structural variation, deviating from the canonical vertebrate model.
  • Centromere position plasticity observed under evolutionary pressures and genomic stress.
  • Evidence suggests rapid, potentially uncoupled, evolution of centromeric DNA and CENH3, challenging traditional co-evolutionary models.
  • Epigenetic variations between parental centromeres can induce failure and genome elimination, impacting hybrid fertility.

Conclusions:

  • Plant centromere organization is highly plastic and epigenetically regulated by CENH3.
  • The rapid evolution of centromeric components may contribute to speciation and hybridization barriers.
  • Further research is needed to elucidate the mechanisms driving centromere evolution and CENH3 adaptation.