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Related Concept Videos

Crossing Over01:34

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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 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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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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Meiosis II01:57

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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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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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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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Updated: May 25, 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, Salt Lake City, UT 84112, USA.

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Summary

Scientists identified a key interface in the synaptonemal complex during meiosis in C. elegans. This interaction between chromosome axes and the central region is crucial for genetic exchange and proper chromosome alignment.

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Area of Science:

  • Cell Biology
  • Genetics
  • Molecular Biology

Background:

  • Meiosis involves chromosome pairing and genetic exchange.
  • The synaptonemal complex (SC) is essential for homologous chromosome alignment.
  • The SC consists of central regions and parallel chromosomal axes.

Purpose of the Study:

  • Identify the molecular interface between SC axes and the central region in C. elegans.
  • Investigate the role of this interface in SC structure and function.
  • Develop a biophysical model for SC assembly.

Main Methods:

  • Charge-reversal mutagenesis in C. elegans.
  • Microscopy to observe SC ultrastructure.
  • Thermodynamic modeling of protein interactions.

Main Results:

  • Identified a conserved interface involving HIM-3 (axis) and SYP-5 (central region).
  • Charge-reversal mutations disrupting this interface altered SC structure.
  • A thermodynamic model showed SC assembly can occur via wetting without active energy.

Conclusions:

  • The identified interface is critical for synaptonemal complex assembly and function.
  • SC assembly is driven by physical forces (wetting) rather than active energy.
  • Chromosome condensation regulates nuclear organization during sexual reproduction.