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• W3200206886 abstract "Eukaryote-eukaryote endosymbiosis was responsible for the spread of chloroplast (plastid) organelles. Stability is required for the metabolic and genetic integration that drives the establishment of new organelles, yet the mechanisms that act to stabilize emergent endosymbioses-between two fundamentally selfish biological organisms-are unclear. Theory suggests that enforcement mechanisms, which punish misbehavior, may act to stabilize such interactions by resolving conflict. However, how such mechanisms can emerge in a facultative endosymbiosis has yet to be explored. Here, we propose that endosymbiont-host RNA-RNA interactions, arising from digestion of the endosymbiont population, can result in a cost to host growth for breakdown of the endosymbiosis. Using the model facultative endosymbiosis between Paramecium bursaria and Chlorella spp., we demonstrate that this mechanism is dependent on the host RNA-interference (RNAi) system. We reveal through small RNA (sRNA) sequencing that endosymbiont-derived messenger RNA (mRNA) released upon endosymbiont digestion can be processed by the host RNAi system into 23-nt sRNA. We predict multiple regions of shared sequence identity between endosymbiont and host mRNA, and demonstrate through delivery of synthetic endosymbiont sRNA that exposure to these regions can knock down expression of complementary host genes, resulting in a cost to host growth. This process of host gene knockdown in response to endosymbiont-derived RNA processing by host RNAi factors, which we term RNAi collisions, represents a mechanism that can promote stability in a facultative eukaryote-eukaryote endosymbiosis. Specifically, by imposing a cost for breakdown of the endosymbiosis, endosymbiont-host RNA-RNA interactions may drive maintenance of the symbiosis across fluctuating ecological conditions." @default.
• W3200206886 created "2021-09-27" @default.
• W3200206886 creator A5002164056 @default.
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• W3200206886 date "2021-09-14" @default.
• W3200206886 modified "2023-09-27" @default.
• W3200206886 title "Emergent RNA–RNA interactions can promote stability in a facultative phototrophic endosymbiosis" @default.
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• W3200206886 doi "https://doi.org/10.1073/pnas.2108874118" @default.
• W3200206886 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8463893" @default.
• W3200206886 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34521754" @default.
• W3200206886 hasPublicationYear "2021" @default.
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