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EcircPred: Sequence and secondary structural property based computational identification of exonic circular RNAs.

Circular RNAs are new class of stable non-coding RNAs, whose expressions are specific to tissues as well as developmental stages and reported to act as gene regulators. Conspicuous presences of some of them as biomarkers for cancers, aging etc. are well reported. Biogenesis of circular RNA competes with Pre-mRNA splicing using the same splicing machinery and gene loci. Also, some circular RNAs are reported to have open reading frames and internal ribosome entry site for ribosome binding, which increases the chance of overlapping features among circular and mRNA transcripts. Therefore, discriminating the Exonic circular RNAs and mRNAs solely through sequence properties is challenging. However, possible discriminating factors, such as, reports on non-canonical arrangement of exons in circular RNAs were cited. This study was dedicated to classify Circular RNAs from mRNAs by recruiting features extracted from sequences as well as predicted secondary structures and ANN classifier models for all these feature types. The features were statistics of di-nucleotide index, emission probability of RNA sequences and entropy of di-nucleotides. Finally a simple decision voting was applied to combine decisions obtained from multiple classifiers. After performing 10 fold cross validation we obtained average values of efficiency, sensitivity, specificity and Mathews correlation coefficient as 0.8374, 0.8544, 0.8203 and 0.6753 respectively. In the backdrop of few reports of identification of circular RNAs from constitutive exons and other long non-coding RNAs, this is the first report of discriminating exonic circular RNAs from mRNAs using sequence and sequence-derived properties.

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