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Animal Mitochondrial Genetics

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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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The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
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A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred...
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Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
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Updated: Feb 11, 2026

Methodology for Accurate Detection of Mitochondrial DNA Methylation
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Spermatozoon and mitochondrial DNA.

Shuji Hirata1, Kazuhiko Hoshi1, Tomoko Shoda1

  • 1Departments of Obstetrics and Gynecology and.

Reproductive Medicine and Biology
|April 28, 2018
PubMed
Summary

Mitochondrial DNA (mtDNA) mutations can cause male infertility and asthenozoospermia. Paternal mtDNA is degraded during fertilization, ensuring only maternal mtDNA is inherited by offspring.

Keywords:
humanmitochondrial DNAspermatozoon

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Area of Science:

  • Cell Biology
  • Genetics
  • Reproductive Medicine

Background:

  • Mitochondria are crucial for ATP production in eukaryotic cells via oxidative phosphorylation.
  • Mitochondria possess their own genome, mitochondrial DNA (mtDNA), encoding essential genes.
  • In human sperm, mitochondria provide energy for motility.

Purpose of the Study:

  • To review the characteristics of mtDNA.
  • To explain the maternal transmission of mtDNA during fertilization.
  • To discuss the role of abnormal mtDNA in male infertility.

Main Methods:

  • Literature review of mitochondrial DNA characteristics.
  • Review of fertilization processes and paternal mtDNA degradation.
  • Analysis of studies linking mtDNA abnormalities to male infertility.

Main Results:

  • Somatic mtDNA mutations are linked to various diseases.
  • Abnormal mtDNA is associated with asthenozoospermia and male infertility.
  • Paternal mitochondria and mtDNA are degraded post-fertilization.

Conclusions:

  • Maternal transmission of mtDNA is the norm.
  • Understanding mtDNA is vital for diagnosing and treating male infertility.
  • Further research into mtDNA's role in reproductive health is warranted.