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Colponemids represent multiple ancient alveolate lineages.

Jan Janouškovec1, Denis V Tikhonenkov2, Kirill V Mikhailov3

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Colponemids, ancient protists, reveal the ancestral mitochondrial genome of alveolates. This discovery offers new insights into the evolution of key lineages like apicomplexans and dinoflagellates.

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Area of Science:

  • Protistology
  • Evolutionary Biology
  • Genomics

Background:

  • Alveolates, including apicomplexans, dinoflagellates, and ciliates, are crucial protist lineages with unique mitochondrial genomes.
  • The evolutionary origins of these distinct mitochondrial characteristics remain largely unknown due to a lack of deep-branching lineages with ancestral traits.

Purpose of the Study:

  • To investigate the ancestral state of alveolate mitochondrial genomes.
  • To characterize colponemids, previously uncultured predatory alveolates, as potential representatives of ancestral lineages.

Main Methods:

  • Establishment of five clonal cultures of colponemids.
  • Multilocus phylogenetic analysis to determine colponemid evolutionary positions.
  • Genome survey of a colponemid strain to analyze mitochondrial genome structure and content.

Main Results:

  • Colponemids represent at least two deep-branching lineages within the Alveolata phylum.
  • The ancestral alveolate mitochondrial genome featured an unusual linear chromosome with telomeres and a larger gene set than currently known alveolates.
  • Environmental lineages were identified as colponemids, expanding their known distribution.

Conclusions:

  • Colponemids provide crucial insights into the ancestral state of mitochondrial genomes in major alveolate lineages.
  • The findings highlight the evolutionary plasticity of mitochondrial genomes within Alveolata.
  • Colponemids represent a valuable resource for future research on the origin and evolution of apicomplexans, dinoflagellates, and ciliates.