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However, predicting a conserved RNA structure remains unreliable, even when using a combination of thermodynamic stability and evolutionary covariation information. Here we present a method to predict a conserved RNA structure that combines the following three features. First, it uses significant covariation due to RNA structure and removes spurious covariation due to phylogeny. Second, it uses negative evolutionary information: basepairs that have variation but no significant covariation are prevented from occurring. Lastly, it uses a battery of probabilistic folding algorithms that incorporate all positive covariation into one structure. The method, named CaCoFold (Cascade variation\/covariation Constrained Folding algorithm), predicts a nested structure guided by a maximal subset of positive basepairs, and recursively incorporates all remaining positive basepairs into alternative helices. The alternative helices can be compatible with the nested structure such as pseudoknots, or overlapping such as competing structures, base triplets, or other 3D non-antiparallel interactions. We present evidence that CaCoFold predictions are consistent with structures modeled from crystallography.<\/jats:p>","DOI":"10.1371\/journal.pcbi.1008387","type":"journal-article","created":{"date-parts":[[2020,10,30]],"date-time":"2020-10-30T13:46:46Z","timestamp":1604065606000},"page":"e1008387","update-policy":"https:\/\/doi.org\/10.1371\/journal.pcbi.corrections_policy","source":"Crossref","is-referenced-by-count":86,"title":["RNA structure prediction using positive and negative evolutionary information"],"prefix":"10.1371","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2084-269X","authenticated-orcid":true,"given":"Elena","family":"Rivas","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"340","published-online":{"date-parts":[[2020,10,30]]},"reference":[{"key":"pcbi.1008387.ref001","doi-asserted-by":"crossref","first-page":"747","DOI":"10.1016\/S0092-8674(02)01134-0","article-title":"Sensing small molecules by 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