DGCR8 is a RNA-binding protein that assists the Rnase III enzyme Drosha in the processing of microRNAs (miRNAs),which regulate the expression of a large number of protein-coding genes. DGCR8,which contains two double-stranded RNA (dsRNA)-binding domains,may be an essential component of the primary miRNAs processing complex,along with Drosha,promoting the processing of primary microRNA to precursor microRNA. It is ubiquitous expressed in human and mouse tissues,and is deleted in DiGeorge syndrome[22323604]. The calculated molecular weight of DGCR8 is 82-86 kDa,but the post-modified DGCR8 is about 120 kDa.