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Related Experiment Videos

Cytoplasmic inheritance and its effects on development and performance

L C Smith1, A A Alcivar

  • 1Centre de Recherche en Reproduction Animale, Faculté de Médecine Vétérinaire, Université de Montréal, Saint-Hyacinthe, QC, Canada.

Journal of Reproduction and Fertility. Supplement
|January 1, 1993
PubMed
Summary
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Maternal inheritance of mitochondrial DNA (mtDNA) is typical in mammals, influencing traits like fat ratio and energy metabolism. Research explores paternal mtDNA contribution and its impact on animal productivity and cloning.

Area of Science:

  • Genetics
  • Cell Biology
  • Animal Science

Background:

  • Cytoplasmic inheritance in mammals, primarily through mitochondrial DNA (mtDNA), is predominantly maternal.
  • Mammalian mtDNA encodes essential components for oxidative phosphorylation, but most mitochondrial proteins are nuclear-encoded.
  • Sperm mitochondria are typically degraded post-fertilization, limiting paternal mtDNA transmission.

Purpose of the Study:

  • To investigate the extent of maternal versus paternal mitochondrial DNA inheritance in mammals.
  • To explore the role of nuclear-mitochondrial interactions in mitochondrial survival and replication.
  • To understand the impact of mitochondrial genetics on animal performance traits and reproductive technologies.

Main Methods:

  • Analysis of mitochondrial DNA transmission in mammals, including interspecific crosses and embryo reconstitution experiments.

Related Experiment Videos

  • Comparative studies using reciprocal crosses in pigs to assess parent-offspring similarity for traits like lean:fat ratio and energy metabolism.
  • Examination of mitochondrial morphology and distribution during oogenesis and early embryogenesis.

    • Main Results:

    • While maternal mtDNA inheritance is dominant, some interspecific crosses suggest limited paternal contribution.
    • Nuclear-mitochondrial interactions are crucial but not essential for exogenous mitochondria survival.
    • Differential partitioning of mitochondria during embryogenesis leads to varying heteroplasmy levels.
    • Mitochondrial DNA polymorphisms are linked to human diseases and cattle performance traits.
    • Pig offspring show greater similarity to dams for lean:fat ratio and oxidative phosphorylation traits.

    Conclusions:

    • Maternal inheritance of mitochondrial DNA is the norm in mammals, with potential exceptions in specific crosses.
    • Mitochondrial dynamics and partitioning during embryogenesis are critical for establishing heteroplasmy.
    • Mitochondrial genetics significantly influences animal performance, with implications for livestock breeding and cloning.