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Analysis of in vivo Interaction between RNA Binding Proteins and Their RNA Targets by UV Cross-linking and Immunoprecipitation (CLIP) Method.
Bio-protocol 2017 May 21
RNA metabolism is tightly controlled across different tissues and developmental stages, and its dysregulation is one of the molecular hallmarks of cancer. Through direct binding to specific sequence element(s), RNA binding proteins (RBPs) play a pivotal role in co- and post-transcriptional RNA regulatory events. We have recently demonstrated that, in pancreatic cancer cells, acquisition of a drug resistant (DR)-phenotype relied on upregulation of the polypyrimidine tract binding protein (PTBP1), which in turn is recruited to the pyruvate kinase pre-mRNA and favors splicing of the oncogenic PKM2 variant. Herein, we describe a step-by-step protocol of the ultraviolet (UV) light cross-linking and immunoprecipitation (CLIP) method to determine the direct binding of a RBP to specific regions of its target RNAs in adherent human cell lines.
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