Superabundant microRNAs are transcribed from human rDNA spacer promoters insulated by CTCF
This study reveals that superabundant microRNAs, specifically miR-1275 and miR-6724, are transcribed from human rDNA spacer promoters flanked by CTCF, processed and exported rapidly independent of canonical pathways, and function as circulating cancer biomarkers with potential general regulatory roles.