CLIP-Seq or HITS-CLIP

High-Throughput Sequencing of CLIP cDNA Library

Crosslinking and immunoprecipitation (CLIP), with the use of RNase T1 trimming, was first described by Ule et al (Ule et al., 2005). and later applied to high-throughput sequencing to map protein-RNA binding sites in vivo (Licatalosi et al., 2008) (Chi et al., 2009). This approach is similar to RIP-Seq but uses crosslinking to stabilize the protein-RNA complexes.

In HITS-CLIP, RNA-protein complexes are UV-crosslinked and immunoprecipitated. The protein-RNA complexes are treated with RNase T1, followed by proteinase K. RNA is extracted and reverse-transcribed to cDNA. Deep sequencing of the cDNA provides single-base resolution mapping of protein binding sites on RNA.

An improvement on the HITS-CLIP protocol was published by Gillen et al., which reduces artifacts from mispriming occurences (Gillen et al., 2016).

Other versions: iCLIP, irCLIP, eCLIP, miCLIP

Advantages:

  • Crosslinking stabilizes the protein-target binding
  • UV crosslinking can be carried out in vivo
  • Provides low background and higher resolution of binding site, due to RNase digestion
  • No prior knowledge of the RNA is required
  • Genome-wide RNA screen

Disadvantages:

  • Over-representation of the RT complement due to mispriming (Gillen et al., 2016)
  • Antibodies not specific to the target may precipitate nonspecific complexes.
  • UV crosslinking is not efficient and requires close protein-RNA interactions
  • Artifacts may be introduced during the crosslinking process


Reagents:

Illumina Library prep and Array Kit Selector



Reviews:

Cook K. B., Hughes T. R. and Morris Q. D. High-throughput characterization of protein-RNA interactions. Brief Funct Genomics. 2015;14:74-89



References:

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Ji Z., Song R., Huang H., Regev A. and Struhl K. Transcriptome-scale RNase-footprinting of RNA-protein complexes. Nat Biotechnol. 2016;34:410-413

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Spengler R. M., Zhang X., Cheng C., et al. Elucidation of transcriptome-wide microRNA binding sites in human cardiac tissues by Ago2 HITS-CLIP. Nucleic Acids Res. 2016;

Gillen A. E., Yamamoto T. M., Kline E., Hesselberth J. R. and Kabos P. Improvements to the HITS-CLIP protocol eliminate widespread mispriming artifacts. BMC Genomics. 2016;17:338

Moore M. J., Zhang C., Gantman E. C., Mele A., Darnell J. C. and Darnell R. B. Erratum: Mapping Argonaute and conventional RNA-binding protein interactions with RNA at single-nucleotide resolution using HITS-CLIP and CIMS analysis. Nat Protoc. 2016;11:616

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