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- W2897900908 abstract "Extrachromosomal genetic elements such as bacterial endosymbionts and plasmids generally exhibit AT-contents that are increased relative to their hosts’ DNA. The AT-bias of endosymbiotic genomes is commonly explained by neutral evolutionary processes such as a mutational bias towards increased A+T. Here we show experimentally that an increased AT-content of host-dependent elements can be selectively favoured. Manipulating the nucleotide composition of bacterial cells by introducing A+T-rich or G+C-rich plasmids, we demonstrate that cells containing GC-rich plasmids are less fit than cells containing AT-rich plasmids. Moreover, the cost of GC-rich elements could be compensated by providing precursors of G+C, but not of A+T, thus linking the observed fitness effects to the cytoplasmic availability of nucleotides. Accordingly, introducing AT-rich and GC-rich plasmids into other bacterial species with different genomic GC-contents revealed that the costs of G+C-rich plasmids decreased with an increasing GC-content of their host’s genomic DNA. Taken together, our work identifies selection as a strong evolutionary force that drives the genomes of intracellular genetic elements toward higher A+T contents." @default.
- W2897900908 created "2018-10-26" @default.
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- W2897900908 date "2019-04-29" @default.
- W2897900908 modified "2023-09-25" @default.
- W2897900908 title "Selective advantages favour high genomic AT-contents in intracellular elements" @default.
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- W2897900908 doi "https://doi.org/10.1371/journal.pgen.1007778" @default.
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- W2897900908 hasPublicationYear "2019" @default.
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