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Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers.  Nondisjunction is common during anaphase I or anaphase II of meiosis.  Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold...
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Karyotypic changes through dysploidy persist longer over evolutionary time than polyploid changes.

Marcial Escudero1, Santiago Martín-Bravo2, Itay Mayrose3

  • 1Molecular Biology and Biochemical Engineering, Pablo de Olavide University, Seville, Spain ; Herbarium, The Morton Arboretum, Lisle, Illinois, United States of America ; Botany, The Field Museum, Chicago, Illinois, United States of America.

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Summary
This summary is machine-generated.

Chromosome number changes impact plant evolution. While polyploidy is common, single chromosome gains/losses (dysploidy) may offer longer-term evolutionary persistence and diversification benefits.

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Area of Science:

  • Evolutionary biology
  • Plant genetics
  • Speciation research

Background:

  • Chromosome evolution significantly influences angiosperm diversification and speciation.
  • Polyploidy is linked to major plant radiations but also decreased diversification rates.
  • Gains and losses of single chromosomes (aneuploidy/dysploidy) are less studied evolutionary mechanisms.

Purpose of the Study:

  • Investigate the role of chromosome number transitions and genome size changes in angiosperm evolution.
  • Model chromosome number evolution tempo and mode.
  • Correlate chromosome evolution with cladogenesis patterns in 15 angiosperm clades.

Main Methods:

  • Phylogenetic analysis of chromosome number evolution.
  • Modeling of chromosome number transitions (polyploidy vs. dysploidy).
  • Chi-square analysis to assess diversification neutrality.

Main Results:

  • Polyploid transitions are more frequent in recent evolutionary times.
  • Single chromosome gains/losses (dysploidy) are likely due to fission/fusion events, often without DNA content change.
  • Recently originated polyploids show lower persistence, while dysploidy suggests longer-term evolutionary stability.

Conclusions:

  • Dysploidy may have greater long-term persistence than polyploidy in angiosperm evolution.
  • Chromosome number changes via dysploidy appear evolutionarily neutral regarding diversification.
  • Understanding chromosome dynamics is crucial for explaining angiosperm evolutionary trajectories.