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Journal Articles EMBO Reports Year : 2024

New plastids, old proteins: repeated endosymbiotic acquisitions in kareniacean dinoflagellates

Abstract

Abstract Dinoflagellates are a diverse group of ecologically significant micro-eukaryotes that can serve as a model system for plastid symbiogenesis due to their susceptibility to plastid loss and replacement via serial endosymbiosis. Kareniaceae harbor fucoxanthin-pigmented plastids instead of the ancestral peridinin-pigmented ones and support them with a diverse range of nucleus-encoded plastid-targeted proteins originating from the haptophyte endosymbiont, dinoflagellate host, and/or lateral gene transfers (LGT). Here, we present predicted plastid proteomes from seven distantly related kareniaceans in three genera ( Karenia , Karlodinium , and Takayama ) and analyze their evolutionary patterns using automated tree building and sorting. We project a relatively limited ( ~ 10%) haptophyte signal pointing towards a shared origin in the family Chrysochromulinaceae. Our data establish significant variations in the functional distributions of these signals, emphasizing the importance of micro-evolutionary processes in shaping the chimeric proteomes. Analysis of plastid genome sequences recontextualizes these results by a striking finding the extant kareniacean plastids are in fact not all of the same origin, as two of the studied species ( Karlodinium armiger , Takayama helix ) possess plastids from different haptophyte orders than the rest.
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hal-04512033 , version 1 (19-03-2024)

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Anna Mg Novák Vanclová, Charlotte Nef, Zoltán Füssy, Adél Vancl, Fuhai Liu, et al.. New plastids, old proteins: repeated endosymbiotic acquisitions in kareniacean dinoflagellates. EMBO Reports, 2024, ⟨10.1038/s44319-024-00103-y⟩. ⟨hal-04512033⟩
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