RNA Secondary Structures with Limited Base Pair Span: Exact Backtracking and an Application

Genes

Ronny Lorenz¹  PeterF. Stadler¹ 

[1] Institute for Theoretical Chemistry, University of Vienna, Währingerstraße 17, A-1090 Vienna, Austria;

关键词: RNA secondary structure prediction;    scanning algorithm;    hyper-stable RNA elements;   

DOI  :  10.3390/genes12010014

来源: DOAJ

【 摘 要 】

The accuracy of RNA secondary structure prediction decreases with the span of a base pair, i.e., the number of nucleotides that it encloses. The dynamic programming algorithms for RNA folding can be easily specialized in order to consider only base pairs with a limited span L, reducing the memory requirements to $O\left(nL\right)$, and further to $O\left(n\right)$ by interleaving backtracking. However, the latter is an approximation that precludes the retrieval of the globally optimal structure. So far, the ViennaRNA package therefore does not provide a tool for computing optimal, span-restricted minimum energy structure. Here, we report on an efficient backtracking algorithm that reconstructs the globally optimal structure from the locally optimal fragments that are produced by the interleaved backtracking implemented in RNALfold. An implementation is integrated into the ViennaRNA package. The forward and the backtracking recursions of RNALfold are both easily constrained to structural components with a sufficiently negative z-scores. This provides a convenient method in order to identify hyper-stable structural elements. A screen of the C. elegans genome shows that such features are more abundant in real genomic sequences when compared to a di-nucleotide shuffled background model.

【 授权许可】

Unknown