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Methods Mol Biol. 2013;977:111-24. doi: 10.1007/978-1-62703-284-1_9.

Isolation of intracellular protein--DNA complexes using HaloCHIP, an antibody-free alternative to chromatin immunoprecipitation.

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  • 1Promega Corporation, Madison, WI, USA.


Mapping of protein binding sites within the genome has been significantly advanced by microarray and sequencing technologies, yet the method traditionally used to isolate protein-DNA complexes, chromatin immunoprecipitation, has remained dependent of the use of antibodies. Furthermore, cross-linking is commonly used to trap protein-DNA complexes and the challenge of using antibodies has come in recognition of the cross-linked epitopes, sometimes limiting the success of the approach. Here we present a method, HaloCHIP, which utilizes a HaloTag protein fusion and corresponding interaction resin, HaloLink, for capture of cross-linked protein-DNA complexes directly from a cellular lysate. This process alleviates the need for using an antibody, yields the DNA fragments bound to a particular protein of interest, and allows for a variety of downstream analyses such as PCR, qPCR, microarrays, and sequencing.

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