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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

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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Oogenesis01:22

Oogenesis

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Oogenesis,  the process of developing egg cells (female gametes), occurs within the ovaries and is fundamental to female fertility. This sequence begins during fetal development when diploid oogonia in the developing ovaries undergo mitotic divisions to produce primary oocytes. By birth, these primary oocytes enter prophase I of meiosis but become arrested in this stage, remaining suspended until puberty.
Each primary oocyte is surrounded by a layer of pre-granulosa cells, forming what is...
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Oogenesis02:07

Oogenesis

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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...
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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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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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Transcriptional Integration of Meiotic Prophase I Progression and Early Oocyte Differentiation.

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Related Experiment Video

Updated: Mar 13, 2026

Chromatin Spread Preparations for the Analysis of Mouse Oocyte Progression from Prophase to Metaphase II
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Chromatin Spread Preparations for the Analysis of Mouse Oocyte Progression from Prophase to Metaphase II

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Coordinating meiotic prophase I progression and early oocyte differentiation.

Kimberly M Abt1, Myles A Bartholomew1, Anna E K Nixon1

  • 1MCB Graduate Program, Brown University, 70 Ship Street, Box G-E4, Providence, RI 02903, USA.

Development (Cambridge, England)
|March 12, 2026
PubMed
Summary

The transcriptional regulator TAF4b is crucial for proper oocyte development. Its absence impairs meiotic progression and DNA repair, impacting female fertility and ovarian reserve maintenance.

Keywords:
Female infertilityFetal oocyte attritionMeiosisOogenesisOvarian reserveTranscription

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Chromatin Spread Preparations for the Analysis of Mouse Oocyte Progression from Prophase to Metaphase II
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Meiotic Spindle Assessment in Mouse Oocytes by siRNA-mediated Silencing
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Area of Science:

  • Reproductive Biology
  • Developmental Biology
  • Genetics

Background:

  • Female reproductive senescence is linked to the depletion of the ovarian reserve, a finite pool of oocytes.
  • Oocytes must initiate meiosis and oogenesis during fetal development to establish the ovarian reserve.
  • Factors regulating these early oocyte development events remain largely unknown.

Purpose of the Study:

  • To investigate the role and timing of the transcriptional regulator TAF4b in mouse fetal oocytes.
  • To understand TAF4b's function during meiotic prophase I progression.

Main Methods:

  • Analysis of TAF4b-deficient mouse fetal oocytes.
  • Assessment of meiotic progression, specifically the pachytene-to-diplotene transition.
  • Evaluation of double-strand DNA break repair efficiency.
  • Transcriptional profiling of oocytes at different developmental stages (E16.5-E18.5).

Main Results:

  • TAF4b-deficient oocytes initiate meiosis I on time but show compromised progression through meiotic prophase I.
  • Impaired meiotic progression correlates with reduced double-strand DNA break repair.
  • Transcriptional profiling reveals dysregulation in meiotic gene expression reduction and oocyte differentiation gene activation in Taf4b-deficient oocytes.

Conclusions:

  • TAF4b plays a critical role in ensuring the fidelity of meiotic progression and DNA repair in developing oocytes.
  • Proper TAF4b function is essential for coordinating gene expression changes during oocyte maturation.
  • Dysregulation of TAF4b impacts ovarian reserve maintenance and potentially contributes to female reproductive senescence.