An overview of the main circRNA databases

Circular RNAs (circRNAs) are a family of non-coding RNAs, whose head 3’ and tail 5’ ends covalently bond together to lead to a circular form. To date, thousands of circRNAs in human, mouse, rat, as well as other animals have been reported by computational analysis of sequencing data, and the numbers are likely to grow. Recently, great efforts have been paid in the circRNA study. Thus, building a comprehensive circRNA database becomes more and more imperative. So far, several databases of circRNA have been provided such as circBase, circRNADb, circ2traits, deepBase, circInteractome and circNet. In this review, we listed the frequently-used databases for circRNA research and described their features, respectively.