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Genome-wide analysis of gene expression has changed the RNA world. Recent techniques leading to this revolution have been the use of cross-linking and immunoprecipitation (CLIP) combined with high-throughput sequencing (HITS-CLIP) to determine sites on nascent mRNAs to which RNA-binding proteins bind. Several researchers (including us) have been examining the role of RNA-binding proteins in polyadenylation, including the role of the 64,000 Mr component of the cleavage stimulation factor, CstF-64. In this chapter, we present our optimizations of the CLIP procedure for examination of CstF-64 binding to nascent pre-mRNAs expressed in testis. For CstF-64 CLIP, we use a well-characterized monoclonal antibody (3A7) that recognizes CstF-64. Rather than optimizing tricky but essential RNA fragment cloning schemes, we illustrate the use of the proprietary Illumina TruSeq Small RNA Sample Preparation kit for this step. Other techniques such as SDS-PAGE and the transfer to the nitrocellulose membrane techniques follow the original Illumina protocol (though we point out potential pitfalls). Finally, we discuss the options for high-throughput sequencing and some general suggestions for bioinformatic analysis of the data.

methods in molecular biology

High-Throughput Sequencing of RNA Isolated by Cross-Linking and Immunoprecipitation (HITS-CLIP) to Determine Sites of Binding of CstF-64 on Nascent RNAs