Poster abstracts
Poster number 35 submitted by Scott Hinger
Diverse long-RNAs are differentially sorted into extracellular vesicles secreted by colorectal cancer cells
Scott Hinger (Vanderbilt University), Dr. James G. Patton (Vanderbilt University)
Abstract:
The regulation and functional roles of secreted coding and long noncoding RNAs (lncRNAs, >200nt) are largely unknown. We previously showed that mutant KRAS colorectal cancer (CRC) cells release EVs containing distinct proteomes, miRNAs, and circular RNAs. Here, we comprehensively identify diverse classes of CRC extracellular long RNAs secreted in EVs and demonstrate differential export of specific RNAs. Distinct noncoding RNAs including antisense transcripts and transcripts derived from pseudogenes are enriched in EVs compared to cellular profiles. We detected strong enrichment of Rab13 in mutant KRAS EVs and demonstrate functional delivery of Rab13 mRNA to recipient cells. To assay functional transfer of lncRNAs, we implemented a CRISPR/Cas9 based RNA-tracking system to monitor delivery to recipient cells. We show that gRNAs containing export signals from secreted RNAs can be transferred from donor to recipient cells. Our data support the existence of cellular mechanisms to selectively export diverse classes of RNA.
Keywords: RNA-seq, extracellular RNA, cell-cell communication