Molecular protocol for genome-wide and cell-type-selective profiling of in vivo small noncoding RNA:target RNA interactions by CIMERA-seq

Small noncoding RNAs (sncRNAs) can regulate gene expression by guiding the RNA-induced silencing complex (RISC) to targeted transcripts for translational repression and/or target destabilization. Here, we present a robust benchtop protocol, termed CIMERA-seq, for the unambiguous profiling of sncRNA:target RNA interactions in a genome-wide and cell-type-selective manner. We describe steps for in vivo crosslinking and harvesting tissue, immunoprecipitation and covalent ligation of sncRNAs to target RNAs within the RISC, and sequencing of the resulting chimeric sncRNA:target RNA interactions. For complete details on the use and execution of this protocol, please refer to Li et al.¹.