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Related Experiment Videos

Evolution of the hydrogenosome

G A Biagini1, B J Finlay, D Lloyd

  • 1Microbiology Group, School of Pure and Applied Biology, University of Wales Cardiff, UK. Biagini@cardiff.ac.uk

FEMS Microbiology Letters
|November 14, 1997
PubMed
Summary
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Hydrogenosomes, unique organelles in anaerobic eukaryotes, likely evolved from mitochondria, not multiple origins. This suggests mitochondria have a more ancient evolutionary history than previously believed.

Area of Science:

  • Evolutionary biology
  • Cell biology
  • Biochemistry

Background:

  • The origin and function of hydrogenosomes, redox organelles in anaerobic unicellular eukaryotes, have been debated for nearly 25 years.
  • Previous hypotheses suggested a polyphyletic origin for hydrogenosomes.

Purpose of the Study:

  • To synthesize recent molecular, physiological, and morphological studies to clarify the origin of hydrogenosomes.
  • To evaluate the prevailing hypotheses regarding hydrogenosome evolution.

Main Methods:

  • Review and integration of molecular data.
  • Analysis of physiological studies.
  • Assessment of morphological evidence.

Main Results:

  • Current evidence favors the hypothesis that hydrogenosomes evolved from a modification of pre-existing mitochondria.

Related Experiment Videos

  • This finding contradicts the previously held polyphyletic origin theory for hydrogenosomes.

    • Conclusions:

    • Hydrogenosomes represent a modified form of mitochondria.
    • The data suggest a more ancient evolutionary origin for mitochondria than previously understood.