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Related Concept Videos

Forces Acting on Chromosomes02:11

Forces Acting on Chromosomes

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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...
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Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
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Meiosis II02:02

Meiosis II

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Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
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Meiosis I03:09

Meiosis I

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Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
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Attachment of Sister Chromatids02:57

Attachment of Sister Chromatids

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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...
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Microtubules form through the end-to-end polymerization of tubulin heterodimers. Kinetochore microtubules originate from the spindle poles, and their plus-ends connect with the kinetochores on sister-chromatids. Ndc80 protein complexes, present on the kinetochore, form low-affinity links with the plus end of these kinetochore microtubules.
Plus-end depolymerization releases tubulin heterodimers from the terminal region of the microtubule. As tubulin subunits are lost, the Ndc80 complexes detach...
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Chromosome size-dependent polar ejection force impairs mammalian mitotic error correction.

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Chromosome size impacts kinetochore-microtubule attachment stability. Long chromosomes may experience delayed biorientation due to increased forces, potentially leading to chromosomal instability without compensatory mechanisms.

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Area of Science:

  • Cell Biology
  • Genetics
  • Biophysics

Background:

  • Accurate chromosome segregation relies on sister kinetochores attaching to opposite spindle poles.
  • The mammalian kinetochore stabilizes correct attachments and destabilizes incorrect ones, but the discrimination mechanism remains unclear.

Purpose of the Study:

  • To investigate the role of kinetochore tension in attachment stability.
  • To determine how chromosome size influences attachment stability and biorientation.

Main Methods:

  • Live imaging of PtK2 cells with varying chromosome sizes.
  • Perturbation of polar ejection forces using chromokinesin overexpression and laser ablation.
  • Observation of kinetochore error correction dynamics.

Main Results:

  • Long chromosomes align later at the metaphase plate compared to short chromosomes.
  • Long chromosomes show a specific delay in correcting incorrect attachments.
  • Chromosome size and forces on chromosome arms dictate alignment order.

Conclusions:

  • Increased force on long chromosomes can falsely stabilize incorrect attachments, delaying biorientation.
  • Long chromosomes might require specific error correction mechanisms to prevent chromosomal instability.