Genomes of nitrogen-fixing eukaryotes reveal a non-canonical model of organellogenesis.

ABSTRACT: Endosymbiotic gene transfer and import of host-encoded proteins are considered hallmarks of organelles necessary for stable integration of two cells. However, newer endosymbiotic models have challenged the origin and timing of such genetic integration during organellogenesis. Epithemia diatoms contain diazoplasts, obligate endosymbionts that are closely related to recently-described nitrogen-fixing organelles and share similar function as integral cell compartments. We report genomic analyses of two species which are highly divergent but share a common ancestor at the origin of the endosymbiosis. We found minimal evidence of genetic integration in E.clementina: nonfunctional diazoplast-to-nucleus DNA transfers and 6 host-encoded proteins of unknown function in the diazoplast

SUBMITTER: Frail S 

PROVIDER: S-EPMC11383321 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature