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Related Concept Videos

Separation of Sister Chromatids02:17

Separation of Sister Chromatids

At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
Separation of Sister Chromatids02:17

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At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
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Cohesin protein complexes are a molecular glue that holds two sister chromatids together. They play an important role both in mitosis and meiosis. In mitosis, all cohesin complexes present on the chromosomes are removed before the start of the anaphase stage.
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The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results.

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Live Cell Imaging of Chromosome Segregation During Mitosis
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Chromosome segregation: disarming the protector.

Swastika Sanyal1, Ines Kovacikova, Juraj Gregan

  • 1Max F. Perutz Laboratories, Department of Chromosome Biology, University of Vienna, Dr. Bohr-Gasse 1, 1030 Vienna, Austria.

Current Biology : CB
|March 23, 2013
PubMed
Summary

Shugoshin-protein phosphatase 2A (PP2A) protects centromeric cohesin in meiosis I. A new model proposes a PP2A inhibitor causes cohesin deprotection during meiosis II, impacting cell division.

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Area of Science:

  • Cell Biology
  • Genetics
  • Molecular Biology

Background:

  • Meiosis involves two divisions, crucial for sexual reproduction.
  • Shugoshin-protein phosphatase 2A (PP2A) complex protects centromeric cohesin during meiosis I.
  • This protection is absent during meiosis II.

Purpose of the Study:

  • To propose a new model for centromeric cohesin regulation during meiosis II.
  • To elucidate the mechanism of cohesin deprotection in the second meiotic division.

Main Methods:

  • The study is based on a theoretical model.
  • It integrates existing experimental data on cohesin and PP2A function.
  • The model proposes the involvement of a PP2A inhibitor.

Main Results:

  • The model suggests a PP2A inhibitor is responsible for removing cohesin protection at centromeres during meiosis II.
  • This mechanism explains the differential protection of cohesin between meiosis I and meiosis II.

Conclusions:

  • A PP2A inhibitor is a key factor in centromeric cohesin deprotection during meiosis II.
  • This finding provides a molecular explanation for a critical event in meiosis.