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Published on: April 11, 2014
Chromatin affinity purification
1Department of Biochemistry, The Rosalind and Morris Goodman Cancer Research Centre, McGill University, Montreal, QC, Canada.
Methods in Molecular Biology (Clifton, N.J.)
|November 25, 2011
Summary
Chromatin affinity purification (ChAP) offers an alternative to ChIP when antibodies are unavailable. This method uses tagged proteins for chromatin purification, identifying transcriptional targets effectively.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Chromatin immunoprecipitation (ChIP) is a key technique for studying protein-DNA interactions in vivo.
- ChIP relies on high-quality antibodies, which are not always available for specific proteins.
- Limitations in antibody availability hinder the identification of novel transcriptional targets.
Purpose of the Study:
- To develop and validate an alternative method to ChIP for identifying protein-DNA interactions.
- To establish a reliable technique for purifying chromatin associated with specific proteins.
- To overcome the limitations posed by the unavailability of specific antibodies in ChIP assays.
Main Methods:
- Developed Chromatin Affinity Purification (ChAP) using tandem affinity purification of tagged proteins.
- Utilized inducible retroviral vectors for stable expression of tagged proteins at physiological levels.
- Applied ChAP followed by microarray analysis (ChAP-chip) to identify target genomic sites.
Main Results:
- Successfully generated cells expressing recombinant tagged-proteins at physiological levels.
- Validated ChAP method for effective chromatin purification and identification of protein-DNA interactions.
- Identified protein targets using ChAP that were confirmed by independent ChAP and ChIP assays.
Conclusions:
- Chromatin Affinity Purification (ChAP) provides a viable alternative to ChIP, especially when antibodies are scarce.
- The ChAP method enables reliable identification of protein-DNA interactions and transcriptional targets.
- This technique facilitates the study of transcriptional regulation by overcoming antibody-dependent limitations.
Related Concept Videos
02:36Chromatin Immunoprecipitation- ChIP
Chromatin immunoprecipitation, or ChIP, is an antibody-based technique used to identify sites on DNA that bind to transcription factors of interest or histone proteins. It also helps determine the type of histone modifications such as acetylation, phosphorylation, or methylation.
Types of ChIP
ChIP can be divided into two types - X-ChIP and N-ChIP. X-ChIP involves in vivo cross-linking of histones and regulatory proteins to DNA, fragmenting the DNA by sonication, and isolating the protein-DNA...
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