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Related Concept Videos

Combinatorial Gene Control02:33

Combinatorial Gene Control

Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
Oogenesis01:22

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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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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...
Zygotic Development And Stem Cell Formation01:10

Zygotic Development And Stem Cell Formation

The development of all multicellular organisms starts with the fusion of haploid cells called sperm and egg to form a diploid zygote. A zygote is a totipotent cell that can develop into a complete organism. The zygote undergoes cell division or cleavage to form an 8-cell mass. Until this stage, the cells are spherical, loosely attached, and remain totipotent. Totipotent cells are capable of developing both the embryonic and the extraembryonic tissues. However, as they continue to divide, they...
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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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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...

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Quantitative Analysis of Protein Expression to Study Lineage Specification in Mouse Preimplantation Embryos
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Polycomb function during oogenesis is required for mouse embryonic development.

Eszter Posfai1, Rico Kunzmann, Vincent Brochard

  • 1Friedrich Miescher Institute for Biomedical Research, CH-4058 Basel, Switzerland.

Genes & Development
|April 14, 2012
PubMed
Summary
This summary is machine-generated.

Polycomb repressive complex 1 (PRC1) components Ring1 and Rnf2 are crucial for oogenesis. Their absence impairs embryonic development by affecting zygotic genome activation and cell cycle progression.

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Using Mouse Oocytes to Assess Human Gene Function During Meiosis I
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Area of Science:

  • Developmental Biology
  • Epigenetics
  • Genetics

Background:

  • Totipotent embryos arise from gamete fusion, requiring chromatin remodeling and zygotic genome activation (ZGA).
  • Reprogramming somatic cells is inefficient, suggesting germline chromatin's role in developmental competence.

Purpose of the Study:

  • To investigate the role of Polycomb-repressive complex 1 (PRC1) components Ring1 and Rnf2 in mammalian oogenesis and early embryonic development.
  • To elucidate the contribution of PRC1 to zygotic genome activation (ZGA) and developmental proficiency.

Main Methods:

  • Studied the redundant transcriptional functions of Ring1 and Rnf2 during oogenesis.
  • Utilized chromosome exchange experiments between control and Ring1/Rnf2-deficient metaphase II oocytes.

Main Results:

  • Ring1 and Rnf2 are essential for proper ZGA, replication, and cell cycle progression in early embryos.
  • PRC1 exhibits both cytoplasmic and chromosome-based contributions to embryonic development.
  • Development beyond the two-cell stage is impaired in the absence of these PRC1 components.

Conclusions:

  • Polycomb group proteins (PRC1) are vital in the female germline for establishing developmental competence in the next generation.
  • PRC1 silences differentiation-inducing genes and establishes appropriate chromatin states essential for embryogenesis.
  • These findings highlight a critical role for epigenetic regulation in germ cells for successful embryonic development.