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Related Concept Videos

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 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

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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Separation of Sister Chromatids02:17

Separation of Sister Chromatids

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At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
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Cleavage and Blastulation01:33

Cleavage and Blastulation

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After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage is a mitotic cell division that does not result in growth. With each round of successive cell division, daughter cells get increasingly smaller.
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Meiosis vs. Mitosis02:57

Meiosis vs. Mitosis

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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.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
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Primordial Germ Cell Transplantation for CRISPR/Cas9-based Leapfrogging in Xenopus
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Phase Separation during Germline Development.

Chun So1, Shiya Cheng1, Melina Schuh1

  • 1Department of Meiosis, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany.

Trends in Cell Biology
|January 18, 2021
PubMed
Summary
This summary is machine-generated.

Phase separation is key to cell organization, controlling germ cell development and oocyte maturation. This review highlights its essential roles in germline processes like granule formation and spindle assembly.

Keywords:
biomolecular condensatesgerm cellsgermline developmentmeiosisoocytesphase separation

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Biochemistry

Background:

  • Intracellular organization relies on phase separation, a process crucial for biological functions.
  • Dysfunctional phase separation is implicated in protein aggregation diseases.
  • Emerging evidence highlights the significance of phase separation in germline development.

Purpose of the Study:

  • To review the critical roles of phase separation in germline development.
  • To elucidate how phase separation drives key events in germ cell formation and maturation.

Main Methods:

  • Literature review of recent research on phase separation in germline biology.
  • Analysis of studies focusing on germ granules, Balbiani bodies, and meiotic processes.

Main Results:

  • Phase separation governs germ granule assembly and segregation, determining germ cell fate.
  • It facilitates the formation of the Balbiani body for oocyte RNA and organelle storage.
  • Phase separation drives meiotic recombination and spindle assembly in mammalian oocytes.

Conclusions:

  • Phase separation is a fundamental mechanism orchestrating essential germline development processes.
  • Understanding phase separation offers insights into reproductive biology and related pathologies.