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Oogenesis

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...

Oogenesis

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...

Mitochondria

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...

Mitochondria

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...

Folliculogenesis

Folliculogenesis

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...

Meiosis vs. Mitosis

Meiosis vs. Mitosis

Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...

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Related Experiment Video

Updated: Jun 10, 2026

Studying Mitochondrial Structure and Function in Drosophila Ovaries

Studying Mitochondrial Structure and Function in Drosophila Ovaries

Published on: January 4, 2017

[Mitochondria and oocyte maturation].

J Steffann¹, C Fallet

¹Génétique Médicale, INSERM U 781, Hôpital Necker-Enfants Malades, Tour Lavoisier, Troisième étage, 149, Rue de Sèvres, 75743 Paris cedex 15, France.

Journal De Gynecologie, Obstetrique Et Biologie De La Reproduction

|August 24, 2010

Summary

This summary is machine-generated.

Mitochondrial DNA (mtDNA) mutations can affect oocyte maturation and embryo development. However, some mtDNA mutations are naturally selected against during female gametogenesis, with no impact below a certain threshold.

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Human Egg Maturity Assessment and Its Clinical Application

Human Egg Maturity Assessment and Its Clinical Application

Published on: August 19, 2019

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Last Updated: Jun 10, 2026

Studying Mitochondrial Structure and Function in Drosophila Ovaries

Studying Mitochondrial Structure and Function in Drosophila Ovaries

Published on: January 4, 2017

Human Egg Maturity Assessment and Its Clinical Application

Human Egg Maturity Assessment and Its Clinical Application

Published on: August 19, 2019

Area of Science:

Cellular Biology
Genetics
Reproductive Medicine

Context:

Mitochondria are crucial for cellular energy production.
Mitochondrial DNA (mtDNA) is maternally inherited.
mtDNA defects are linked to reproductive disorders, potentially impairing oocyte maturation.

Purpose:

To investigate the impact of mitochondrial DNA (mtDNA) point mutations on oocyte maturation and early embryonic development.
To determine if negative selection of mtDNA mutations occurs during female gametogenesis.

Summary:

Mitochondrial DNA (mtDNA) point mutations were observed in patients with reproductive issues, suggesting a role in oocyte maturation failure.
The study found that some mtDNA mutations undergo negative selection during female gametogenesis.
A threshold rate exists for mtDNA mutations; below this level, oocyte maturation and early embryonic development are not significantly impacted.

Impact:

This research clarifies the threshold for pathogenic mtDNA mutations in female reproduction.
Findings suggest that not all mtDNA mutations compromise reproductive potential.
Provides insights into the mechanisms of mtDNA quality control during oogenesis.