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Videos de Conceptos Relacionados

The Mitotic Spindle02:27

The Mitotic Spindle

The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...
Spindle Assembly02:50

Spindle Assembly

Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
Attachment of Sister Chromatids02:57

Attachment of Sister Chromatids

As cells progress into mitosis, the nuclear envelope breaks down, and the condensed chromosomes are exposed to the array of bipolar microtubules of the mitotic spindle. The kinetochore, a large, disc-shaped protein complex, is present at the centromere region of the sister chromatids and acts as a binding site for the microtubules.  Usually, the plus-end of a single microtubule is embedded within the kinetochore. However, some kinetochores first establish lateral contact with the side-wall of a...
Forces Acting on Chromosomes02:11

Forces Acting on Chromosomes

During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis. 
Microtubules and motor proteins exert two types of forces on...
The Mitotic Spindle02:27

The Mitotic Spindle

The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...
Attachment of Sister Chromatids02:57

Attachment of Sister Chromatids

As cells progress into mitosis, the nuclear envelope breaks down, and the condensed chromosomes are exposed to the array of bipolar microtubules of the mitotic spindle. The kinetochore, a large, disc-shaped protein complex, is present at the centromere region of the sister chromatids and acts as a binding site for the microtubules.  Usually, the plus-end of a single microtubule is embedded within the kinetochore. However, some kinetochores first establish lateral contact with the side-wall of a...

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Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets
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Published on: August 13, 2016

La cromatina da forma al eje mitótico.

Ana Dinarina1, Céline Pugieux, Maria Mora Corral

  • 1Cell Biology and Biophysics Unit, European Molecular Biology Laboratory, Heidelberg D-69117, Germany.

Cell
|August 12, 2009
PubMed
Resumen

La forma y el tamaño de la cromatina controlan la formación del huso mitótico en extractos de Xenopus. Las dimensiones específicas son cruciales para la simetría del huso bipolar y la segregación cromosómica precisa durante la división celular.

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Área de la Ciencia:

  • Biología celular Biología celular.
  • Biología Molecular Biología Molecular
  • La biofísica es la biofísica.

Sus antecedentes:

  • La cromatina mitótica es esencial para organizar los microtúbulos en un huso bipolar.
  • Las dimensiones del husillo y la simetría son críticas para una segregación cromosómica precisa.

Objetivo del estudio:

  • Investigar cómo las propiedades físicas de la cromatina influyen en la autoorganización del huso mitótico.
  • Para determinar el papel de las dimensiones y la forma de la cromatina en la simetría del husillo y la formación de polos.

Principales métodos:

  • Se utilizan extractos citoplasmáticos de Xenopus laevis.
  • Empleado microprinting para inmovilizar las cuentas recubiertas de cromatina en superficies de diapositivas.
  • Examinó la formación de husos en respuesta a varias formas y tamaños de cromatina (manchas circulares, líneas).

Principales resultados:

  • Las manchas circulares de cromatina (14-18 microm) indujeron husillos bipolares; las manchas más grandes llevaron a números de polos anormales.
  • La longitud de la línea de cromatina se correlacionó con la formación de polos; las líneas más largas causaron desorganización.
  • El grosor de la línea influyó en la simetría: las líneas más delgadas (<10 micras) formaban husillos simétricos, mientras que las líneas más gruesas inducían la asimetría.

Conclusiones:

  • La geometría de la cromatina dicta directamente la forma y la orientación del huso mitótico.
  • Las características físicas de la cromatina son determinantes clave de la organización y función del huso.