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Related Concept Videos

Mitochondria01:37

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,...
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...
Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
Mitochondrial Membranes01:45

Mitochondrial Membranes

A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
Meiosis vs. Mitosis02:57

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...
Animal Mitochondrial Genetics02:59

Animal Mitochondrial Genetics

Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...

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Related Experiment Video

Updated: May 15, 2026

Imaging of mtHyPer7, a Ratiometric Biosensor for Mitochondrial Peroxide, in Living Yeast Cells
09:47

Imaging of mtHyPer7, a Ratiometric Biosensor for Mitochondrial Peroxide, in Living Yeast Cells

Published on: June 2, 2023

The aging oocyte--can mitochondrial function be improved?

Yaakov Bentov1, Robert F Casper1

  • 1Toronto Centre for Advanced Reproductive Technology, Division of Reproductive Sciences, Department of Obstetrics and Gynecology, University of Toronto, and Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada.

Fertility and Sterility
|January 1, 2013
PubMed
Summary
This summary is machine-generated.

Delayed childbirth contributes to reproductive senescence, a public health issue. Mitochondrial dysfunction and oxidative stress are key factors, with coenzyme Q10 deficiency playing a role.

Related Experiment Videos

Last Updated: May 15, 2026

Imaging of mtHyPer7, a Ratiometric Biosensor for Mitochondrial Peroxide, in Living Yeast Cells
09:47

Imaging of mtHyPer7, a Ratiometric Biosensor for Mitochondrial Peroxide, in Living Yeast Cells

Published on: June 2, 2023

Area of Science:

  • Reproductive biology
  • Gerontology
  • Biochemistry

Background:

  • Social and cultural trends are leading women to delay childbirth.
  • This delay contributes to reproductive senescence, a growing public health concern.
  • Age-related decline in female reproductive function is increasingly prevalent.

Purpose of the Study:

  • To discuss potential causes of age-related female reproductive decline.
  • To examine the role of mitochondrial dysfunction and oxygen radicals in reproductive aging.
  • To investigate coenzyme Q10 deficiency in reproductive senescence.

Main Methods:

  • Literature review and evidence synthesis.
  • Analysis of factors contributing to aging and reproductive decline.
  • Exploration of biochemical pathways involved in senescence.

Main Results:

  • Mitochondrial dysfunction is a central factor in aging and reproductive senescence.
  • Increased oxygen radical production contributes significantly to reproductive aging.
  • Coenzyme Q10 deficiency is identified as a contributing factor.

Conclusions:

  • Mitochondrial dysfunction and oxidative stress are critical in female reproductive aging.
  • Addressing coenzyme Q10 deficiency may offer therapeutic potential.
  • Understanding these mechanisms is vital for managing reproductive health in aging women.