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Videos de Conceptos Relacionados

Cohesins02:20

Cohesins

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.
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of homologous...
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...
The Contractile Ring02:15

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Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...
Cohesins02:20

Cohesins

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.
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of homologous...
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...
The Contractile Ring02:15

The Contractile Ring

Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...

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Spatiotemporal Analysis of Cytokinetic Events in Fission Yeast
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La cohesión cromosómica forma un anillo.

Stephan Gruber1, Christian H Haering, Kim Nasmyth

  • 1Research Institute of Molecular Pathology, Dr Bohr-Gasse 7, 1030 Vienna, Austria.

Cell
|March 26, 2003
PubMed
Resumen
Este resumen es generado por máquina.

El complejo de cohesión forma una estructura de anillo esencial para la cohesión de las cromatidas hermanas. Sus fragmentos de escisión permanecen unidos, revelando cómo la cohesión se desprende de los cromosomas durante la división celular.

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Área de la Ciencia:

  • Biología celular Biología celular.
  • Biología Molecular Biología Molecular
  • Genética La genética.

Sus antecedentes:

  • El complejo de cohesina es crucial para mantener la cohesión de las cromatidas hermanas durante la mitosis.
  • La cohesina se compone de las subunidades Smc1, Smc3 y Scc1, que forman una estructura en forma de anillo.
  • La escisión mediada por separación de Scc1 desencadena la liberación de cohesión en el inicio de la anafase.

Objetivo del estudio:

  • Para investigar si la cohesión forma una estructura de anillo completo in vivo.
  • Para dilucidar el mecanismo de liberación de la cohesina de los cromosomas durante la anafase.

Principales métodos:

  • Análisis de las interacciones de las subunidades de cohesión después de la escisión de Scc1.
  • Investigando el papel de la separación de la bobina enrollada Smc3 en la liberación de cohesión.

Principales resultados:

  • Los fragmentos de escisión de Scc1 permanecen asociados con el heterodimero Smc1/Smc3.
  • La escisión de la bobina enrollada Smc3 por sí sola es suficiente para liberar la cohesina de los cromosomas.
  • La pérdida de cohesión de las cromatidas hermanas se correlaciona con la liberación de cohesina.

Conclusiones:

  • La estructura de anillo de la cohesina se mantiene por las interacciones entre los fragmentos de Scc1 y el heterodímero Smc1/Smc3.
  • La asociación topológica con la cromatina, mediada por la bobina enrollada Smc3, es crítica para la función de la cohesión.