Genome evolution of a nonparasitic secondary heterotroph, the diatom<i>Nitzschia putrida</i>

DOI DOI 機関リポジトリ (HANDLE) HANDLE HANDLE ほか2件をすべて表示 一部だけ表示 研究データあり 被引用文献4件 参考文献120件 オープンアクセス

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  • Genome evolution of a nonparasitic secondary heterotroph, the diatom Nitzschia putrida

説明

Secondary loss of photosynthesis is observed across almost all plastid-bearing branches of the eukaryotic tree of life. However, genome-based insights into the transition from a phototroph into a secondary heterotroph have so far only been revealed for parasitic species. Free-living organisms can yield unique insights into the evolutionary consequence of the loss of photosynthesis, as the parasitic lifestyle requires specific adaptations to host environments. Here, we report on the diploid genome of the free-living diatom Nitzschia putrida (35 Mbp), a nonphotosynthetic osmotroph whose photosynthetic relatives contribute ca. 40% of net oceanic primary production. Comparative analyses with photosynthetic diatoms and heterotrophic algae with parasitic lifestyle revealed that a combination of gene loss, the accumulation of genes involved in organic carbon degradation, a unique secretome, and the rapid divergence of conserved gene families involved in cell wall and extracellular metabolism appear to have facilitated the lifestyle of a free-living secondary heterotroph.

収録刊行物

  • Science Advances

    Science Advances 8 (17), eabi5075-, 2022-04

    American Association for the Advancement of Science (AAAS)

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