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• W3117989504 abstract "Abstract In vitro selection is a powerful tool that can be used to understand basic principles of molecular evolution. We used in vitro selection to understand how changes in length and the accumulation of point mutations enable the evolution of functional RNAs. Using RNA populations of various lengths, we performed a series of in vitro experiments to select for ribozymes with RNA ligase activity. We identified a core ribozyme structure that was robust to changes in RNA length, high levels of mutagenesis, and increased selection pressure. Elaboration on this core structure resulted in improved activity which we show is consistent with a larger trend among functional RNAs in which increasing motif size can lead to an exponential improvement in fitness. We conclude that elaboration on conserved core structures is a preferred mechanism in RNA evolution. This conclusion, drawn from selections of RNAs from random sequences, is consistent with proposed evolutionary histories of specific biological RNAs. More generally, our results indicate that modern RNA structures can be used to infer ancestral structures. Our observations also suggest a mechanism by which structural outcomes of early RNA evolution would be largely reproducible even though RNA fitness landscapes consist of disconnected clusters of functional sequences." @default.
• W3117989504 created "2021-01-05" @default.
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• W3117989504 date "2020-12-24" @default.
• W3117989504 modified "2023-10-16" @default.
• W3117989504 title "<i>In vitro</i>selections with RNAs of variable length converge on a robust catalytic core" @default.
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• W3117989504 doi "https://doi.org/10.1093/nar/gkaa1238" @default.
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• W3117989504 hasPublicationYear "2020" @default.
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