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Related Concept Videos

Animal Mitochondrial Genetics02:59

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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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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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 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,...
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Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm⁠—such as chloroplasts and mitochondria⁠—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.
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Updated: Jan 11, 2026

Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing
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Testing the Mother's Curse Hypothesis in Human Mitochondrial Genome Evolution.

Ruiqi Yuan1, Jianzhi Zhang1

  • 1Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109, USA.

Genome Biology and Evolution
|November 8, 2025
PubMed
Summary

The mother's curse hypothesis (MCH) suggests males have more mitochondrial DNA (mtDNA) mutations. This study found no evidence supporting MCH in humans, indicating no sex-based difference in mtDNA mutation load.

Keywords:
GWASdiseasefitnessmtDNAmutation loadsex

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Human health

Background:

  • Mitochondrial DNA (mtDNA) is maternally inherited in vertebrates.
  • Mutations harming only males can spread if they benefit females, leading to the mother's curse hypothesis (MCH).
  • MCH predicts a higher mtDNA mutation load in males than females, with implications for health and evolution.

Purpose of the Study:

  • To systematically test the mother's curse hypothesis in humans using extensive mtDNA variation.
  • To investigate sex-specific differences in mtDNA mutation load and their impact on reproductive fitness and disease.

Main Methods:

  • Analysis of genotypic and phenotypic data from ~0.5 million UK Biobank participants.
  • Estimation of reproductive fitness (offspring number, sexual partners) for mtDNA variants in each sex.
  • Examination of mtDNA variant frequencies and disease associations between sexes.

Main Results:

  • No evidence found to support the mother's curse hypothesis in humans.
  • A positive intersexual correlation in offspring number across mitochondrial haplogroups was observed.
  • No significant sex-biased enrichment of male disease-associated mtDNA variants was detected.

Conclusions:

  • The study provides no genomic support for the mother's curse hypothesis in humans.
  • No detectable difference in mtDNA mutation load between males and females was found in the UK Biobank cohort.
  • mtDNA variation does not appear to impose a greater mutational burden on males compared to females in humans.