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Degenerate mitochondria.

Mark van der Giezen1, Jorge Tovar

  • 1School of Biological Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS, UK.

EMBO Reports
|June 9, 2005
PubMed
Summary
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Mitochondria, the powerhouses of eukaryotic cells, originated from a single bacterial ancestor. They have since evolved into diverse forms, adapting to various environments and raising questions about their core functions.

Area of Science:

  • * Evolutionary biology
  • * Cell biology
  • * Genomics

Background:

  • * Mitochondria are essential eukaryotic organelles responsible for biological energy generation.
  • * They originated from a single bacterial endosymbiont over 1,500 million years ago.
  • * Comparative genomics indicates a monophyletic origin for mitochondria.

Purpose of the Study:

  • * To explore the independent evolution of the mitochondrial endosymbiont in diverse anaerobic and aerobic eukaryotic lineages.
  • * To investigate the functional heterogeneity of mitochondrial variants, including anaerobic and aerobic mitochondria, hydrogenosomes, and mitosomes.
  • * To determine if a common function underlies the retention of mitochondrial organelles across different eukaryotes.

Main Methods:

  • * Comparative genomics analysis.

Related Experiment Videos

  • * Evolutionary studies of endosymbiosis.
  • * Functional characterization of organelle variants.

    • Main Results:

    • * Evidence supports a monophyletic origin of mitochondria from a single bacterial endosymbiont.
    • * Independent evolution in varied environments has led to diverse mitochondrial forms (mitochondria, hydrogenosomes, mitosomes).
    • * Significant morphological, genetic, and functional heterogeneity exists among these organelle variants.

    Conclusions:

    • * The mitochondrion's origin is singular, but its evolutionary trajectory has diversified significantly.
    • * Understanding the common driving force behind mitochondrial retention is crucial for comprehending eukaryotic evolution.
    • * Further research is needed to elucidate the central common function, if any, of these diverse organelles.