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Related Concept Videos

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.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
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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 I03:09

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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.
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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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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Related Experiment Video

Updated: Aug 31, 2025

Preparation of Meiotic Chromosome Spreads from Zebrafish Spermatocytes
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Cilia regulate meiotic recombination in zebrafish.

Haibo Xie1,2,3, Xiaosi Wang4, Minjun Jin1,3

  • 1Institute of Evolution & Marine Biodiversity, Ocean University of China, Qingdao 266003, China.

Journal of Molecular Cell Biology
|August 18, 2022
PubMed
Summary

Cilia, essential for cell signaling, unexpectedly regulate meiosis and genetic diversity. Disrupting cilia in zebrafish germ cells impairs DNA repair and crossover formation, revealing a new role for these structures in sexual reproduction.

Keywords:
kif3aciliahomologous recombinationmeiosiszebrafish

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Area of Science:

  • Cell Biology
  • Genetics
  • Developmental Biology

Background:

  • Meiosis is crucial for genetic diversity in sexual eukaryotes.
  • The regulation of meiotic recombination by extracellular signals remains poorly understood.
  • Cilia function as cellular antennae, sensing external signals.

Purpose of the Study:

  • To investigate the role of cilia in meiotic recombination.
  • To determine if cilia influence double-strand break repair and crossover formation during gametogenesis.

Main Methods:

  • Utilized zebrafish as a model organism.
  • Developed a germ cell-specific CRISPR/Cas9 system for gene manipulation.
  • Analyzed the effects of ciliary gene depletion on meiotic processes.

Main Results:

  • Cilia were specifically observed in prophase I germ cells of zebrafish.
  • Depletion of ciliary genes led to impaired double-strand break repair.
  • Reduced crossover formation and increased germ cell apoptosis were observed following ciliary gene disruption.

Conclusions:

  • Cilia play a critical, previously unrecognized role in regulating meiotic recombination.
  • Extracellular signals may modulate meiotic recombination through cilia.
  • This finding opens new avenues for understanding genetic diversity and reproductive processes.