IMR Press / FBL / Volume 12 / Issue 13 / DOI: 10.2741/2438

Frontiers in Bioscience-Landmark (FBL) is published by IMR Press from Volume 26 Issue 5 (2021). Previous articles were published by another publisher on a subscription basis, and they are hosted by IMR Press on imrpress.com as a courtesy and upon agreement with Frontiers in Bioscience.

Article
A quick and quantitative chromatin immunoprecipitation assay for small cell samples
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1 Institute of Basic Medical Sciences, Department of Biochemistry, Faculty of Medicine, University of Oslo, PO Box 1112 Blindern, 0317 Oslo, Norway
Front. Biosci. (Landmark Ed) 2007, 12(13), 4925–4931; https://doi.org/10.2741/2438
Published: 1 September 2007
Abstract

Chromatin immunoprecipitation (ChIP) is to date a technique of choice for studying protein-DNA interactions. ChIP has been used for mapping the location of modified histones on DNA, often in relation to transcription or differentiation. A drawback of current ChIP protocols, however, is the requirement for large cell numbers, which limits the applicability of ChIP to rare cell samples. The procedure is also tedious and time consuming. We systematically evaluated and modified critical steps in the ChIP procedure to develop a quick and quantitative ChIP assay, referred to as Q2ChIP, suitable for up to 1,000 histone immunoprecipitations or 100 transcription factor immunoprecipitations from as few as 100,000 cells under cross-linking conditions. Analysis of the precipitated DNA by real time PCR enables quantification of the relative amount of a specific histone modification or transcription factor associated with a specific locus. This communication describes all steps of the Q2ChIP procedure as it is carried out in our laboratory.

Keywords
Chromatin Immunoprecipitation
Epigenetics
Gene Expression
Histone Acetylation
Histone Methylation
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