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Related Experiment Videos

Centromeres, checkpoints and chromatid cohesion

R C Allshire1

  • 1MRC Human Genetics Unit, Western General Hospital, Crewe Road, Edinburgh, EH4 2XU, UK. robin@hgu.mrc.ac.uk

Current Opinion in Genetics & Development
|April 1, 1997
PubMed
Summary
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Centromere epigenetic regulation influences heterochromatin association and kinetochore function. Key proteins are involved in maintaining sister chromatid cohesion during cell division.

Area of Science:

  • Cell Biology
  • Epigenetics
  • Molecular Biology

Background:

  • Centromere formation is increasingly understood to be epigenetically regulated, linked to heterochromatin.
  • Studies in yeast, human neocentromeres, and Drosophila provide evidence for this epigenetic modulation.
  • Kinetochore-microtubule interactions and sister chromatid cohesion are critical for accurate cell division.

Purpose of the Study:

  • To explore the epigenetic mechanisms governing centromere formation and function.
  • To investigate the role of heterochromatin in centromere activity.
  • To understand the regulation of kinetochore components and sister chromatid cohesion.

Main Methods:

  • Comparative analyses of centromeres in various organisms (fission yeast, humans, Drosophila).

Related Experiment Videos

  • Investigation of neocentromeres and dicentric chromosomes.
  • Examination of kinetochore component phosphorylation and protein localization.

    • Main Results:

    • Evidence supports an epigenetic model for centromere formation involving heterochromatin.
    • A connection exists between kinetochore tension and phosphorylation of kinetochore proteins.
    • Conserved spindle integrity checkpoint components (e.g., MAD2 homologues) are found at kinetochores.
    • Proteins involved in sister chromatid cohesion and their anaphase degradation patterns have been identified.

    Conclusions:

    • Epigenetic factors play a crucial role in establishing functional centromeres.
    • The spindle assembly checkpoint and sister chromatid cohesion mechanisms are conserved across species.
    • Understanding these processes is vital for comprehending chromosome segregation and preventing aneuploidy.