Allison Coté, Aoife O'Farrell, Ian Dardani, Margaret Dunagin, Chris Coté, Yihan Wan, Sareh Bayatpour, Heather L Drexler, Katherine A Alexander, Fei Chen, Asmamaw T Wassie, Rohan Patel, Kenneth Pham, Edward S Boyden, Shelly Berger, Jennifer Phillips-Cremins, L Stirling Churchman, Arjun Raj
Splicing is the stepwise molecular process by which introns are removed from pre-mRNA and exons are joined together to form mature mRNA sequences. The ordering and spatial distribution of these steps remain controversial, with opposing models suggesting splicing occurs either during or after transcription. We used single-molecule RNA FISH, expansion microscopy, and live-cell imaging to reveal the spatiotemporal distribution of nascent transcripts in mammalian cells. At super-resolution levels, we found that pre-mRNA formed clouds around the transcription site...
April 5, 2024: ELife