A hyperbranched transcription-activated CRISPR-Cas12a signal amplification strategy for sensitive microRNA sensing

A CRISPR-Cas12a-based strategy is developed for sensitive microRNA sensing, in which hyperbranched rolling circle amplification and transcription are integrated for the activation of the trans -cleavage ability of Cas12a. The integrated triplex signal amplification endows the strategy with a low background and high sensitivity. This design expands the scope of the CRISPR-Cas-based sensing toolbox and shows great potential in biological and biomedical studies. A hyperbranched RCA-assisted transcription and CRISPR-Cas12a-based triplex signal amplification strategy is developed for the sensitive detection of microRNA.