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Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male...
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Spermatogenesis is a complex process that involves the development of sperm cells from undifferentiated stem cells in the seminiferous tubules of the testes. The process is essential for the production of mature and functional sperm cells that are capable of fertilizing an egg.
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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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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,...
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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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Mitochondrial dynamics during spermatogenesis.

Grigor Varuzhanyan1, David C Chan2

  • 1Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA.

Journal of Cell Science
|July 18, 2020
PubMed
Summary
This summary is machine-generated.

Mitochondrial dynamics, including fusion and fission, are crucial for cellular health. This review explores their vital role in mammalian spermatogenesis, the complex process of sperm development.

Keywords:
Membrane fissionMembrane fusionMitochondrial dynamicsSpermatogenesis

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Reproductive Biology

Background:

  • Mitochondrial dynamics (fusion and fission) maintain cellular homeostasis, particularly in high-energy tissues.
  • The role of mitochondrial dynamics in developmental processes with changing metabolic needs, like spermatogenesis, is less understood.
  • While mitochondrial fusion was identified in Drosophila spermatogenesis early on, its function in mammalian sperm development remained unclear for years.

Purpose of the Study:

  • To review the emerging role of mitochondrial biology, specifically mitochondrial dynamics, during male germ line development.
  • To highlight mammalian spermatogenesis as a model system for studying *in vivo* mitochondrial dynamics due to its complex metabolic transitions.

Main Methods:

  • Literature review of mitochondrial dynamics and spermatogenesis research.
  • Synthesis of findings on mitochondrial and metabolic transitions during sperm development.

Main Results:

  • Mitochondrial dynamics are essential for maintaining cellular function and energy demands.
  • Mammalian spermatogenesis involves intricate, developmentally regulated mitochondrial and metabolic shifts.
  • The study of mitochondrial dynamics in male germ line development is an evolving field.

Conclusions:

  • Mitochondrial dynamics play a critical, yet understudied, role in mammalian spermatogenesis.
  • Understanding mitochondrial dynamics is key to comprehending male fertility and germ cell development.
  • Further research into mitochondrial biology during spermatogenesis is warranted.