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• W2122699350 abstract "It is well understood that apicomplexan parasites, such as the malaria pathogen Plasmodium, are descended from free-living algae, and maintain a vestigial chloroplast that has secondarily lost all genes of photosynthetic function. Recently, two fully photosynthetic relatives of parasitic apicomplexans have been identified, the ‘chromerid’ algae Chromera velia and Vitrella brassicaformis, which retain photosynthesis genes within their chloroplasts. Elucidating the processes governing gene expression in chromerid chloroplasts might provide valuable insights into the origins of parasitism in the apicomplexans. We have characterised chloroplast transcript processing pathways in C. velia, V. brassicaformis and P. falciparum with a focus on the addition of an unusual, 3′ poly(U) tail. We demonstrate that poly(U) tails in chromerids are preferentially added to transcripts that encode proteins that are directly involved in photosynthetic electron transfer, over transcripts for proteins that are not involved in photosynthesis. To our knowledge, this represents the first chloroplast transcript processing pathway to be associated with a particular functional category of genes. In contrast, Plasmodium chloroplast transcripts are not polyuridylylated. We additionally present evidence that poly(U) tail addition in chromerids is involved in the alternative processing of polycistronic precursors covering multiple photosynthesis genes, and appears to be associated with high levels of transcript abundance. We propose that changes to the chloroplast transcript processing machinery were an important step in the loss of photosynthesis in ancestors of parasitic apicomplexans." @default.
• W2122699350 created "2016-06-24" @default.
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• W2122699350 date "2014-01-16" @default.
• W2122699350 modified "2023-10-17" @default.
• W2122699350 title "Evolution of Chloroplast Transcript Processing in Plasmodium and Its Chromerid Algal Relatives" @default.
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• W2122699350 doi "https://doi.org/10.1371/journal.pgen.1004008" @default.
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