Description
Forming biomolecular condensates by phase separation has recently emerged as a new principle for regulating gene expression in response to extracellular signaling. However, the molecular mechanisms underlying the coupling of signaling transduction and gene activation through condensate formation and how dysregulation of these mechanisms contributes to disease progression remain elusive. Here we report that CREB-regulated transcription coactivator 2 (CRTC2) translocates to nucleus and forms phase-separated condensates upon activation of cAMP signaling. We show that CRTC2 interacts with positive transcription elongation factor b (P-TEFb), and cAMP-induced CRTC2 condensate formation activates P-TEFb by extracting P-TEFb from its inhibitory complex. Aberrantly elevated cAMP signaling plays central roles in the development of autosomal dominant polycystic kidney disease (ADPKD). We demonstrate that, in contrast to a dispersed cytosolic distribution in the normal tubular epithelia cells, CRTC2 localizes in nucleus and forms condensates in cystic epithelial cells of mouse and human ADPKD kidneys. We show that genetic depletion of CRTC2 markedly suppresses cyst growth in an orthologous ADPKD mouse model. Using integrative transcriptomic and cistromic analyses, we identify CRTC2-regulated cystogenic genes, whose activation depends on CRTC2 condensation-facilitated P-TEFb recruitment and RNA polymerase II pausing release. Together, our findings elucidate a mechanism by which CRTC2 nuclear condensation conveys cAMP signaling to transcription elongation activation and promotes cystogenesis in ADPKD.
Overall Design
RNA-sequencing of different condition: sgControl and sgCRTC2 in WT9-12.
Curator
xm_li