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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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Mutations01:39

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Mutations01:35

Mutations

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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
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Non-nuclear Inheritance01:29

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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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Mismatch Repair01:20

Mismatch Repair

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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
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Related Experiment Video

Updated: Nov 16, 2025

An In Vitro Approach to Study Mitochondrial Dysfunction: A Cybrid Model
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Mitochondrial DNA mutations do not impact early human embryonic development.

Kalliopi Chatzovoulou1, Anne Mayeur2, Nadine Gigarel1

  • 1Université de Paris, Institut Imagine et Service de Génétique Moléculaire, Hôpital Necker-Enfants Malades, Paris, France.

Mitochondrion
|February 27, 2021
PubMed
Summary

Mitochondrial DNA (mtDNA) mutations do not affect early human embryo development or viability. This study found no impact on embryonic quality or mtDNA copy number in embryos with mtDNA mutations.

Keywords:
Cleavage-stage embryoEmbryonic developmentMitochondrionSelectionmtDNA copy numbermtDNA mutation

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Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing
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Area of Science:

  • Genetics
  • Developmental Biology
  • Mitochondrial Biology

Background:

  • Mitochondrial DNA (mtDNA) mutations are linked to severe inherited disorders.
  • The mechanisms of mother-to-offspring transmission of mtDNA mutations remain unclear.
  • Understanding early embryonic effects of mtDNA mutations is crucial.

Purpose of the Study:

  • To investigate the impact of mitochondrial DNA (mtDNA) mutations on early human embryonic development.
  • To compare the morphology, viability, and mtDNA content of control and mutation-carrying human embryos.

Main Methods:

  • Analysis of human embryos at the cleavage stage.
  • Assessment of embryonic morphology and viability.
  • Quantification of mitochondrial DNA (mtDNA) copy number (CN) using real-time PCR in single or two embryonic cells.

Main Results:

  • No significant differences in embryonic quality or viability were observed between control and mitochondrial embryos.
  • Mitochondrial DNA (mtDNA) copy number (CN) remained unaltered in embryos with or without mtDNA mutations.
  • Embryonic mitochondrial DNA (mtDNA) defects did not appear to affect mtDNA metabolism during the early cleavage stage.

Conclusions:

  • Mitochondrial DNA (mtDNA) mutations do not impair early human embryonic development or viability at the cleavage stage.
  • mtDNA copy number and metabolism appear unaffected by mutations in the early stages of human embryogenesis.
  • Further research is needed to understand the long-term effects and transmission of mtDNA mutations.