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Bioenergetic evolution in proteobacteria and mitochondria.

Mauro Degli Esposti1

  • 1Italian Institute of Technology, Genoa, Italy mauro.degliesposti@iit.it.

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Mitochondria evolved from ancient bacteria. Recent studies suggest methylotrophic bacteria, which metabolize single-carbon compounds like methane, are among the closest living relatives to mitochondrial ancestors.

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Area of Science:

  • Cell Biology
  • Evolutionary Biology
  • Microbiology

Background:

  • Mitochondria, essential for cellular energy production, originated from endosymbiotic bacterial ancestors within the alpha-proteobacteria lineage.
  • The precise bacterial origin of mitochondria has been a long-standing question in evolutionary biology.
  • Recent research suggests a link between mitochondria and methylotrophic bacteria.

Purpose of the Study:

  • To explore the potential ancestry of mitochondria from methylotrophic bacteria.
  • To identify common bioenergetic features between proteobacteria and mitochondria.
  • To review overlooked characteristics of methanotrophic bacteria relevant to mitochondrial evolution.

Main Methods:

  • Comparative analysis of central and terminal bioenergetic systems in proteobacteria and mitochondria.
  • Review of existing literature on methylotrophic and methanotrophic bacteria.
  • Examination of morphological and functional similarities, including intracytoplasmic membranes and endosymbiotic capabilities.

Main Results:

  • Methylotrophic bacteria, utilizing single-carbon sources like methanol and methane, show potential as close relatives to mitochondrial ancestors.
  • Shared features in bioenergetic pathways between proteobacteria and mitochondria support this evolutionary link.
  • Methanotrophic bacteria exhibit intracytoplasmic membranes analogous to mitochondrial cristae and engage in endosymbiosis.

Conclusions:

  • Evidence suggests a possible evolutionary relationship between mitochondria and extant methanotrophic proteobacteria.
  • Further genomic studies of methanotrophic endosymbionts are crucial to confirm this hypothesis.
  • This research opens new avenues for understanding the origin of eukaryotic cells.