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Related Concept Videos

Oogenesis02:07

Oogenesis

In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
Meiosis II02:02

Meiosis II

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,...
Meiosis vs. Mitosis02:57

Meiosis vs. Mitosis

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...
Centrosome Duplication02:25

Centrosome Duplication

The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...
Centrosome Duplication02:25

Centrosome Duplication

The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...
Meiosis I03:09

Meiosis I

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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Proteolytically Degraded Alginate Hydrogels and Hydrophobic Microbioreactors for Porcine Oocyte Encapsulation
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Proteolytically Degraded Alginate Hydrogels and Hydrophobic Microbioreactors for Porcine Oocyte Encapsulation

Published on: July 30, 2020

Centrosome abnormalities during porcine oocyte aging.

Yi-Liang Miao1, Qing-Yuan Sun, Xia Zhang

  • 1Department of Veterinary Pathobiology, University of Missouri, 1600 E Rollins Street, Columbia, MO 65211, USA.

Environmental and Molecular Mutagenesis
|July 14, 2009
PubMed
Summary

Aging oocytes lose centrosomes, disrupting meiotic spindle integrity. Caffeine treatment can restore centrosome function and spindle organization in aged oocytes, improving potential fertility outcomes.

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12:11

Analysis of Chromosome Segregation, Histone Acetylation, and Spindle Morphology in Horse Oocytes

Published on: May 11, 2017

Area of Science:

  • Reproductive Biology
  • Cell Biology
  • Oocyte Development

Background:

  • Centrosomes are crucial for meiotic spindle integrity during meiosis II (MII) arrest in oocytes.
  • Oocyte aging, common in advanced maternal age and in vitro fertilization (IVF), leads to aneuploidy due to centrosome instability.
  • Abnormal centrosome and microtubule distribution is observed in aging human and mouse oocytes.

Purpose of the Study:

  • To investigate the dynamic changes in centrosomes and microtubule cytoskeleton in aging porcine oocytes.
  • To evaluate the efficacy of caffeine in restoring spindle integrity and centrosome function in aged oocytes.

Main Methods:

  • Porcine oocytes were aged for 48 hours to induce aging-related changes.
  • The effects of caffeine treatment on the MII spindle, microtubules, and centrosome proteins (gamma-tubulin, NuMA) were analyzed.

Main Results:

  • Aging for 48 hours resulted in absent centrosomes and disorganized meiotic spindles in porcine oocytes.
  • Caffeine treatment prevented centrosome loss and spindle disorganization.
  • Caffeine restored centrosome integrity at meiotic spindle poles, yielding MII spindles similar to fresh oocytes.

Conclusions:

  • Centrosome integrity is vital for maintaining meiotic spindle function during oocyte aging.
  • Caffeine effectively preserves or restores centrosome integrity and meiotic spindle organization in aging oocytes.
  • Caffeine shows potential as a therapeutic agent to improve oocyte quality and reduce aneuploidy in aged or IVF-affected oocytes.