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Related Concept Videos

Folliculogenesis01:20

Folliculogenesis

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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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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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The ovarian cycle is meticulously regulated by the hypothalamic-pituitary-gonadal axis. This cycle orchestrates the release of a mature oocyte, essential for reproduction.
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The menstrual cycle includes a critical component known as the ovarian cycle, which undergoes two main phases each month—the follicular phase and the luteal phase. The follicular phase is variable and averaging around 14 days. Ovulation, triggered by a surge in luteinizing hormone (LH), marks the transition between the two phases. The second phase, the luteal phase, is relatively consistent, lasting approximately 14 days, and is marked by the activity of the corpus luteum. While a cycle...
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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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Fertilization01:38

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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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Zinc dynamics regulate early ovarian follicle development.

Yu-Ying Chen1, Si Chen2, Kiwon Ok3

  • 1Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA.

The Journal of Biological Chemistry
|November 24, 2022
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Summary

Zinc is crucial for early ovarian follicle development, with specific cell-type regulations identified. This study reveals zinc

Keywords:
folliclefolliculogenesisgerm cellgranulosa celloocytezinc

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Area of Science:

  • Reproductive biology and developmental science
  • Cellular and molecular biology
  • Trace element research

Background:

  • Zinc's established roles in late oocyte and preimplantation embryo development are known.
  • The function of zinc in earlier stages of ovarian follicle development, particularly during oocyte-somatic cell interactions, remains largely unexplored.

Purpose of the Study:

  • To investigate the specific roles and regulation of zinc during early ovarian follicle development in mice.
  • To elucidate how zinc availability and localization impact the oocyte and surrounding somatic cells in developing follicles.

Main Methods:

  • Utilized single-cell X-ray fluorescence microscopy to quantify zinc in individual oocytes and somatic cells.
  • Employed a radioactive zinc tracer and a labile zinc probe to assess zinc dynamics.
  • Integrated transcriptomic, proteomic, and zinc loading analyses to identify molecular targets.

Main Results:

  • Observed a significant, stage-specific increase and redistribution of zinc within oocytes at the onset of follicle growth.
  • Found that oocytes tolerate wide zinc fluctuations, whereas somatic cell survival and proliferation are highly sensitive to zinc levels.
  • Identified enrichment of zinc targets within the ubiquitination pathway, suggesting a role in protein regulation.

Conclusions:

  • Distinct, cell type-specific zinc regulations are essential for successful ovarian follicle growth.
  • Physiological changes in zinc localization and availability play fundamental roles in early gamete development.
  • The findings highlight zinc's critical, yet differential, impact on oocyte and somatic cell function during folliculogenesis.