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Markerless Gene Deletion by Floxed Cassette Allelic Exchange Mutagenesis in Chlamydia trachomatis
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Plastid establishment did not require a chlamydial partner.

Daryl Domman1, Matthias Horn1, T Martin Embley2

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This study finds no evidence that chlamydial proteins facilitated the origin of primary plastids. Gene analysis suggests Chlamydiae did not play a role in this crucial endosymbiotic event.

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Area of Science:

  • Endosymbiosis
  • Evolutionary biology
  • Cell biology

Background:

  • Primary plastids originated from a cyanobacterial endosymbiont in an ancient eukaryotic host.
  • The exact selective pressures driving this initial symbiosis remain unclear.
  • A recent hypothesis proposed chlamydial proteins mediated energy transfer from the cyanobiont to the host.

Purpose of the Study:

  • To investigate the evolutionary origins of enzymes involved in the proposed chlamydial role in primary plastid endosymbiosis.
  • To test the hypothesis that Chlamydiae facilitated energy provision for the host cell.

Main Methods:

  • Phylogenetic analysis of key enzymes.
  • Investigating gene origins from host, cyanobacterial, and bacterial lineages.
  • Employing sophisticated phylogenetic models to assess gene transfer events.

Main Results:

  • The metabolic pathway shows a mosaic origin, with genes from host, cyanobacterial, and bacterial ancestors.
  • No strong evidence for Chlamydiae-to-host gene transfer was detected under optimal phylogenetic models.
  • Gene trees do not support a significant role for Chlamydiae in the primary plastid endosymbiosis.

Conclusions:

  • The hypothesis that chlamydial proteins were pivotal in establishing primary plastid endosymbiosis lacks compelling support from gene evolutionary data.
  • The mosaic origin of the pathway suggests contributions from multiple sources, not a specific role for Chlamydiae.
  • Current phylogenetic evidence refutes the proposed Chlamydiae-mediated energy transfer model for primary plastid establishment.