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Related Concept Videos

Oogenesis01:22

Oogenesis

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 known...
Oogenesis02:07

Oogenesis

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...
MicroRNAs01:22

MicroRNAs

MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
MicroRNAs01:22

MicroRNAs

MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA ends...
Hormonal Control of the Ovarian Cycle01:30

Hormonal Control of the Ovarian Cycle

The ovarian cycle is meticulously regulated by the hypothalamic-pituitary-gonadal axis. This cycle orchestrates the release of a mature oocyte, essential for reproduction.
Before puberty, the hypothalamus releases GnRH in a low frequency, low amplitude pulsatile manner. This along with the immature hypothalamic-pituitary-gonadal axis activity, results in low estrogen levels and the absence of a fully functional ovarian cycle.  At puberty, GnRH secretion increases in both frequency and...
Feedback Regulation of Calcium Concentration01:27

Feedback Regulation of Calcium Concentration

Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...

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Related Experiment Video

Updated: Jun 14, 2026

Meiotic Spindle Assessment in Mouse Oocytes by siRNA-mediated Silencing
09:16

Meiotic Spindle Assessment in Mouse Oocytes by siRNA-mediated Silencing

Published on: October 11, 2015

Oocyte-somatic cell communication and microRNA function in the ovary.

S M Hawkins1, M M Matzuk

  • 1Department of Obstetrics and Gynecology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, United States. shannonh@bcm.edu

Annales D'Endocrinologie
|April 6, 2010
PubMed
Summary

Mouse models and genetic manipulation have revealed key factors in ovarian folliculogenesis. These studies highlight the dialogue between oocytes and granulosa cells, including the role of small non-coding RNAs, impacting fertility treatments.

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Related Experiment Videos

Last Updated: Jun 14, 2026

Meiotic Spindle Assessment in Mouse Oocytes by siRNA-mediated Silencing
09:16

Meiotic Spindle Assessment in Mouse Oocytes by siRNA-mediated Silencing

Published on: October 11, 2015

Defining the Program of Maternal mRNA Translation during In vitro Maturation using a Single Oocyte Reporter Assay
08:00

Defining the Program of Maternal mRNA Translation during In vitro Maturation using a Single Oocyte Reporter Assay

Published on: June 16, 2021

Production and Use of Customizable Agarose Molds for Scaffold-Free Mouse Ovarian Follicle Culture
09:50

Production and Use of Customizable Agarose Molds for Scaffold-Free Mouse Ovarian Follicle Culture

Published on: October 24, 2025

Area of Science:

  • Reproductive biology and genetics
  • Ovarian folliculogenesis and oocyte development

Background:

  • Significant advancements in understanding ovarian function over the past two decades.
  • Development of mouse embryonic stem cell technology enabling genetic manipulation.

Purpose of the Study:

  • To identify critical factors regulating ovarian folliculogenesis from primordial follicle formation to ovulation.
  • To elucidate the dialog between oocytes and granulosa cells essential for follicular development and oocyte maturation.
  • To investigate the role of small non-coding RNAs in ovarian processes.

Main Methods:

  • Utilized genetically manipulated mouse models.
  • Investigated molecular factors and gene involvement in ovarian folliculogenesis.
  • Examined the function of small non-coding RNAs (microRNAs and siRNAs) in oocytes.

Main Results:

  • Identified multiple essential factors regulating all stages of ovarian folliculogenesis.
  • Confirmed the crucial dialog between oocytes and granulosa cells for growth, differentiation, and maturation.
  • Highlighted the regulatory role of small non-coding RNAs, particularly in oocytes.

Conclusions:

  • Genetic manipulation in mice has greatly expanded knowledge of ovarian biology.
  • Oocyte-granulosa cell communication is fundamental for reproductive success.
  • Small non-coding RNAs are key regulators with implications for assisted reproductive technology.