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Related Concept Videos

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.
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Oogenesis02:07

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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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Cleavage and Blastulation01:33

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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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Fertilization01:38

Fertilization

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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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Folliculogenesis01:20

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Folliculogenesis is the development of ovarian follicles, the specialized structures within the ovarian cortex where oogenesis, or egg development, occurs. This process is essential for female reproductive health and begins during fetal development when primordial follicles are formed. Each primordial follicle comprises a primary oocyte in the center, surrounded by a single layer of squamous pre-granulosa cells. These follicles remain dormant in late prophase I of meiosis until triggered by...
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Zygotic Development And Stem Cell Formation01:10

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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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Author Spotlight: Evaluating the Impact of Immediate Partial Removal of Cumulus-Oocyte Complexes on Fertilization Efficiency and Embryo Quality
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Oocyte-cumulus cell interaction: a key factor in early embryo development.

Marc Torres-Garrido1,2, Marc Yeste1,2,3, Yentel Mateo-Otero4,5

  • 1Biotechnology of Animal and Human Reproduction (TechnoSperm), Institute of Food and Agricultural Technology, University of Girona, Girona, ES-17003, Spain.

Biological Reviews of the Cambridge Philosophical Society
|May 4, 2026
PubMed
Summary
This summary is machine-generated.

Cumulus cells (CCs) show potential as biomarkers for oocyte competence in assisted reproduction. Gene expression in CCs may better predict oocyte quality and embryo development than current morphological assessments.

Keywords:
biomarkerscumulus cellscumulus–oocyte complexearly embryo developmentoocyte

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Area of Science:

  • Reproductive biology and assisted reproductive technologies (ART).

Background:

  • Oocyte competence evaluation is crucial for ART success.
  • Current morphological assessment of oocyte maturation is subjective and lacks molecular insights.
  • Cumulus cells (CCs) are proposed as biomarkers for oocyte quality due to their physiological role.

Purpose of the Study:

  • To review the influence of CCs on oocyte physiology and early embryo development.
  • To identify promising CC-derived biomarkers for oocyte competence.

Main Methods:

  • Review of mammalian studies examining DNA integrity, viability, gene expression, metabolome, and proteome in CCs.
  • Analysis of existing literature on CCs as potential indicators of oocyte quality.

Main Results:

  • Data on CCs as biomarkers are inconsistent, with conflicting findings on DNA fragmentation, mitochondrial DNA content, and apoptosis.
  • Gene expression profiles in CCs show promise, with several transcripts positively associated with oocyte growth and embryo development.

Conclusions:

  • CCs offer potential as non-invasive biomarkers for oocyte competence in ART.
  • Further research in proteomics, telomere length, and metabolomics is needed to refine CC-based biomarker identification.