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A Comparative Analysis of Mitochondrial Genomes in Eustigmatophyte Algae.

Tereza Ševčíková1, Vladimír Klimeš1, Veronika Zbránková1

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Mitochondrial genomes of eustigmatophyte algae reveal unique gene content and organization. Comparative analysis highlights lineage-specific rearrangements and gene losses, offering insights into algal mitochondrial evolution.

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Area of Science:

  • Algal genomics
  • Mitochondrial DNA evolution
  • Eukaryotic phylogeny

Background:

  • Eustigmatophyceae is a small algal group within Ochrophyta, with Nannochloropsis being the most studied genus.
  • While nuclear and organellar genomes of Nannochloropsis have been sequenced, broader genomic studies for eustigmatophytes are lacking.

Purpose of the Study:

  • To sequence and comparatively analyze mitochondrial genomes (mitogenomes) from key eustigmatophyte lineages.
  • To investigate evolutionary patterns, gene content, and genomic rearrangements within eustigmatophyte mitogenomes.

Main Methods:

  • Sequencing of mitochondrial genomes from Monodopsis sp., Vischeria sp., and Trachydiscus minutus.
  • Comparative genomic analysis with existing Nannochloropsis and other stramenopile mitogenome data.

Main Results:

  • Most eustigmatophyte mitogenomes show collinearity, except for the Vischeria lineage, which exhibits rearrangements and gene loss, correlating with accelerated sequence evolution.
  • Eustigmatophytes are unique among ochrophytes for having the Atp1 protein encoded in the mitogenome.
  • A truncated nad11 gene (mitochondrial) and a separate nuclear gene for the N-terminal part are characteristic of eustigmatophytes.
  • Independent loss of the UGA termination codon and mRF2 occurred in Nannochloropsis and T. minutus lineages.
  • Vischeria sp. mitogenome contains an interrupted rps3 gene, potentially decoded by a unique suppressor tRNA.

Conclusions:

  • Mitochondrial genome evolution in eustigmatophytes is characterized by both conserved features and lineage-specific innovations.
  • These findings provide crucial genomic data for understanding the evolutionary history of Ochrophyta and Stramenopiles.