show Abstracthide AbstractThe R-loop is a common chromatin feature presented from prokaryotic to eukaryotic genomes and has been revealed to be involved in multiple cellular processes. Here, we developed a novel R-loop profiling technique, ULI-ssDRIP-seq, to decte global R-loops from a limited number of cells. Based on this method, we profiled the R-loop landscapes during parental-to-zygotic transition and early development regulatory in zebrafish, and revealed a series of important characters of R-loops. Overall design: ULI-ssDRIP-seq development, and R-loop profiling in zebrafish