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<p>Stramenopiles (Heterokonta) comprise a diverse assemblage of mostly microbial eukaryotes, yet their organellar genomes remain poorly characterized. Here, we present complete mitochondrial and plastid genomes for two Arctic stramenopile flagellates, <i>Plocamiomonas psychrophila</i> and Dictyochophyceae sp. CCMP2098, representing the Pelagophyceae and Dictyochophyceae, respectively. The mitochondrial genome of <i>Pl. psychrophila</i> contains numerous group II introns and uses genetic code 4, a rare feature among Stramenopiles. In Dictyochophyceae sp. CCMP2098, the plastome exhibits an unusual architecture characterized by divergent inverted-repeat (IR) regions, duplicated <i>rps16</i>, and multiple copies of <i>ycf66</i>. Comparative analyses indicated that the plastid <i>ycf60</i> and the mitochondrial <i>rps1</i>, may be more widespread in these two algal classes than currently recognized. Together, our results highlight the structural complexity and evolutionary divergence of organellar genomes in Arctic Stramenopiles and underscore the need to reassess assumptions regarding organellar gene content and genetic code usage in this group. These newly sequenced genomes provide valuable resources for understanding the evolution of cold-adapted photosynthetic lineages within the Stramenopiles.</p>

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Genomic investigations of Plocamiomonas psychrophila and Dictyochophyceae sp. CCMP2098 reveal organellar genome complexity in Arctic Stramenopiles

  • 期刊论文

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  • 发表日期：

    2026年6月24日

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  • Romain Gastineau,
  • Nastasia J. Freyria,
  • Claude Lemieux,
  • Monique Turmel,
  • Christian Otis,
  • Connie Lovejoy

摘要

Stramenopiles (Heterokonta) comprise a diverse assemblage of mostly microbial eukaryotes, yet their organellar genomes remain poorly characterized. Here, we present complete mitochondrial and plastid genomes for two Arctic stramenopile flagellates, Plocamiomonas psychrophila and Dictyochophyceae sp. CCMP2098, representing the Pelagophyceae and Dictyochophyceae, respectively. The mitochondrial genome of Pl. psychrophila contains numerous group II introns and uses genetic code 4, a rare feature among Stramenopiles. In Dictyochophyceae sp. CCMP2098, the plastome exhibits an unusual architecture characterized by divergent inverted-repeat (IR) regions, duplicated rps16, and multiple copies of ycf66. Comparative analyses indicated that the plastid ycf60 and the mitochondrial rps1, may be more widespread in these two algal classes than currently recognized. Together, our results highlight the structural complexity and evolutionary divergence of organellar genomes in Arctic Stramenopiles and underscore the need to reassess assumptions regarding organellar gene content and genetic code usage in this group. These newly sequenced genomes provide valuable resources for understanding the evolution of cold-adapted photosynthetic lineages within the Stramenopiles.