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Related Concept Videos

Cohesins02:20

Cohesins

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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.
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...
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Condensins02:15

Condensins

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Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
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Anaphase Promoting Complex00:50

Anaphase Promoting Complex

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The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
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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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Crossing Over01:30

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Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I,...
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Meiosis I01:49

Meiosis I

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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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Super-Resolution Microscopy of the Synaptonemal Complex Within the Caenorhabditis elegans Germline
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Super-Resolution Microscopy of the Synaptonemal Complex Within the Caenorhabditis elegans Germline

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Synaptonemal complex.

Cathleen M Lake1, R Scott Hawley2

  • 1Stowers Institute for Medical Research, 1000 East 50th Street, Kansas City, MO 64110, USA.

Current Biology : CB
|March 10, 2021
PubMed
Summary
This summary is machine-generated.

The synaptonemal complex is crucial for proper cell division. Lake and Hawley explain its essential components, assembly, and functions in this discussion.

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Area of Science:

  • Cell Biology
  • Genetics
  • Molecular Biology

Background:

  • The synaptonemal complex is a protein structure that forms between homologous chromosomes during meiosis.
  • Understanding its structure and function is vital for comprehending genetic recombination and accurate chromosome segregation.

Purpose of the Study:

  • To provide a comprehensive overview of the synaptonemal complex.
  • To detail the molecular components and assembly process of the synaptonemal complex.
  • To elucidate the functional significance of the synaptonemal complex in meiosis.

Main Methods:

  • Literature review and synthesis of existing research.
  • Analysis of structural and functional data from various model organisms.
  • Discussion of key proteins and their roles in synaptonemal complex formation and function.

Main Results:

  • Detailed description of the ladder-like structure of the synaptonemal complex.
  • Identification of key protein components, including cohesin, transverse filaments, and central elements.
  • Explanation of the synaptonemal complex's role in facilitating homologous chromosome pairing, synapsis, and crossover formation.

Conclusions:

  • The synaptonemal complex is a highly conserved and essential structure for successful meiosis.
  • Its intricate assembly and precise molecular architecture ensure accurate chromosome segregation and genetic diversity.
  • Further research into the synaptonemal complex can provide insights into infertility and genetic disorders.