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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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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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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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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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Mitosis and Cytokinesis01:35

Mitosis and Cytokinesis

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In eukaryotes, the cell division cycle is divided into distinct, coordinated cellular processes that include cell growth, DNA replication/chromosome duplication, chromosome distribution to daughter cells, and finally, cell division. The cell cycle is tightly regulated by its regulatory systems as well as extracellular signals that affect cell proliferation.
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Mitosis and Cytokinesis02:03

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In eukaryotes, the cell division cycle is divided into distinct, coordinated cellular processes that include cell growth, DNA replication/chromosome duplication, chromosome distribution to daughter cells, and finally, cell division. The cell cycle is tightly regulated by its regulatory systems as well as extracellular signals that affect cell proliferation.
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Use of Time-Lapse Microscopy and Stage-Specific Nuclear Depletion of Proteins to Study Meiosis in S. cerevisiae
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Exiting prophase I: no clear boundary.

Hideo Tsubouchi1, Bilge Argunhan2, Tomomi Tsubouchi3

  • 1Institute of Innovative Research, Tokyo Institute of Technology, Tokyo, Japan. htsubouchi@bio.titech.ac.jp.

Current Genetics
|October 27, 2017
PubMed
Summary
This summary is machine-generated.

Meiosis uses programmed DNA breaks for recombination repair, coordinated by the pachytene checkpoint. Key kinases like Dbf4-dependent Cdc7 kinase, Polo kinase, and CDK regulate this process during meiosis I.

Keywords:
Budding yeastCDKDDKHomologous recombinationPolo kinaseThe cell cycleThe synaptonemal complex

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Area of Science:

  • Cell Biology
  • Genetics
  • Molecular Biology

Background:

  • Meiosis involves programmed DNA double-strand breaks (DSBs) essential for homologous recombination.
  • The pachytene checkpoint regulates homologous recombination and cell cycle progression during meiosis I.
  • Meiotic DNA repair shares similarities with vegetative cell DNA damage checkpoints but has unique features.

Purpose of the Study:

  • To review the interplay between meiotic cell cycle control and homologous recombination during meiosis I.
  • To highlight the roles of specific cell cycle kinases in coordinating these processes.

Main Methods:

  • Literature review focusing on recent research.
  • Analysis of the coordination between homologous recombination and cell cycle progression in meiosis.

Main Results:

  • Identified Dbf4-dependent Cdc7 kinase, Polo kinase, and CDK as key regulators.
  • Highlighted the unique mechanisms of meiotic recombination and cell cycle coordination.

Conclusions:

  • The meiotic cell cycle offers a unique system to study DNA repair and cell cycle integration.
  • Specific kinases play crucial roles in orchestrating homologous recombination and cell cycle progression during meiosis I.