PLX190301

GSE73376: DGCR8 acts as a novel adaptor for the exosome complex to degrade double-stranded structured RNAs

• Organsim human
• Type RNASEQ
• Target gene
• Project ARCHS4

The Microprocessor complex (DGCR8/Drosha) is required for microRNA (miRNA) biogenesis but also binds and regulates the stability of several types of cellular RNAs. Of particular interest, DGCR8 controls the stability of mature small nucleolar RNA (snoRNA) transcripts independently of Drosha, suggesting the existence of alternative DGCR8 complex/es with other nucleases to process a variety of cellular RNAs. Here, we found that DGCR8 co-purifies with subunits of the nuclear exosome, preferentially associating with its hRRP6-containing nucleolar form. Importantly, we demonstrate that DGCR8 is essential for the recruitment of the exosome to snoRNAs and to human telomerase RNA. In addition, we show that the DGCR8/exosome complex controls the stability of the human telomerase RNA component (hTR/TERC). Altogether, these data suggests that DGCR8 acts as a novel adaptor to recruit the exosome complex to structured RNAs and induce their degradation. SOURCE: Mireya Plass (mplass@binf.ku.dk) - University of Copenhagen