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Related Concept Videos

Crossing Over01:34

Crossing Over

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Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process...
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Meiosis I01:49

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Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by...
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Attachment of Sister Chromatids02:57

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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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Cohesins02:20

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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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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...
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Meiosis II01:57

Meiosis II

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Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each...
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Forces Acting on Chromosomes02:11

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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. 
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Related Experiment Video

Updated: Jun 16, 2025

Super-Resolution Microscopy of the Synaptonemal Complex Within the Caenorhabditis elegans Germline
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The synaptonemal complex aligns meiotic chromosomes by wetting.

Spencer G Gordon1, Alyssa A Rodriguez2, Yajie Gu2

  • 1School of Biological Sciences and Center for Cell and Genome Sciences, University of Utah, United States.

Biorxiv : the Preprint Server for Biology
|August 16, 2024
PubMed
Summary

Scientists identified a key interface in the synaptonemal complex during meiosis in C. elegans. This finding reveals how chromosome condensation drives nuclear reorganization for sexual reproduction.

Keywords:
C. elegansHORMAcondensationmeiosissynaptonemal complexwetting

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Area of Science:

  • Cell Biology
  • Genetics
  • Molecular Biology

Background:

  • Meiosis involves chromosome pairing and genetic exchange.
  • The synaptonemal complex (SC) aligns chromosomes via axes and a central region.
  • Understanding SC assembly is crucial for reproductive biology.

Purpose of the Study:

  • To identify the specific interface connecting the SC's central region to its axes in C. elegans.
  • To investigate the functional consequences of disrupting this interface.
  • To model the thermodynamic principles governing SC assembly.

Main Methods:

  • Protein interaction analysis in C. elegans.
  • Microscopy to observe SC ultrastructure.
  • Thermodynamic modeling of protein assembly.

Main Results:

  • Identified a conserved interface between the axis protein HIM-3 and the central region protein SYP-5.
  • Weakening this interface disrupts the SC's canonical structure.
  • A thermodynamic model shows SC assembly can occur via wetting without active energy input.

Conclusions:

  • The identified interface is critical for SC integrity during meiosis.
  • Chromosome condensation drives nuclear reorganization in sexual reproduction.
  • SC assembly is a thermodynamically favorable process.