Development of a miRNA Sensor by an Inducible CRISPR-Cas9 Construct in Ciona Embryogenesis.

MicroRNAs (miRNAs) regulate multicellular processes and diverse signaling pathways in organisms. The detection of the spatiotemporal expression of miRNA in vivo is crucial for uncovering the function of miRNA. However, most of the current detecting techniques cannot reflect the dynamics of miRNA sensitively in vivo. Here, we constructed a miRNA-induced CRISPR-Cas9 platform (MICR) used in marine chordate Ciona. The key component of MICR is a pre-single guide RNA (sgRNA) flanked by miRNA-binding sites that can be released by RNA-induced silencing complex (RISC) cleavage to form functional sgRNA in the presence of complementary miRNA. By using the miRNA-inducible CRISPR-on system (MICR-ON), we successfully detected the dynamic expression of a miRNA csa-miR-4018a during development of Ciona embryo. The detected patterns were validated to be consistent with the results by in situ hybridization. It is worth noting that the expression of csa-miR-4018a was examined by MICR-ON to be present in additional tissues, where no obvious signaling was detected by in situ hybridization, suggesting that the MICR-ON might be a more sensitive approach to detect miRNA signal in living animal. Thus, MICR-ON was demonstrated to be a sensitive and highly efficient approach for monitoring the dynamics of expression of miRNA in vivo and will facilitate the exploration of miRNA functions in biological systems.