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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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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.
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During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
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Updated: Feb 28, 2026

Chromatin Spread Preparations for the Analysis of Mouse Oocyte Progression from Prophase to Metaphase II
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Developmentally programmed nuclear pore complex replacement enables oocyte specification.

Shruti Venkat1, Tram Nguyen2, Cecilia Blangini3

  • 1Department of Stem Cell Biology and Regenerative Medicine, Black Family Stem Cell Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.

Biorxiv : the Preprint Server for Biology
|February 27, 2026
PubMed
Summary
This summary is machine-generated.

Maternal oocytes selectively inherit components for embryo development. This study reveals a nuclear pore complex (NPC) renewal pathway essential for oocyte specification and maternal provisioning in Drosophila.

Keywords:
DrosophilaESCRT-IIINuclear pore complexVps4cell fate transitionmaternal inheritancenuclear remodelingoocyte specificationoogenesis

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Genetics

Background:

  • Oocytes provide essential maternal factors for early embryonic development.
  • Maternal factors are selectively inherited, with defective components being eliminated.
  • The regulation of nuclear pore complexes (NPCs) during oocyte development is not well understood.

Purpose of the Study:

  • To investigate whether nuclear pore complexes (NPCs) are subject to surveillance and turnover during oocyte development.
  • To elucidate the mechanisms underlying NPC renewal in the context of oocyte specification.

Main Methods:

  • Utilized Drosophila as a model organism.
  • Investigated NPC levels and turnover dynamics during oocyte specification.
  • Examined the roles of nucleoporin expression timing and the ESCRT-III/Vps4 pathway in NPC degradation.
  • Assessed the consequences of impaired NPC turnover on oocyte development and gene expression.

Main Results:

  • Discovered a developmentally programmed pathway for NPC turnover during oocyte specification in Drosophila.
  • NPC levels decrease through passive dilution (delayed nucleoporin expression) and active degradation (ESCRT-III/Vps4 pathway).
  • NPC clearance is balanced by de novo NPC synthesis, ensuring proper levels.
  • Failure to turnover NPCs leads to persistent germ cell gene expression and defects in oocyte specification.

Conclusions:

  • NPC renewal is a critical process for establishing oocyte identity.
  • This turnover pathway ensures appropriate maternal provisioning by eliminating and replacing NPCs.
  • The findings highlight a novel mechanism for regulating the maternal contribution to embryonic development.