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    Systematic optimization of parameters involvedin preparation of chromatin and chromatinimmunoprecipitation (ChIP) workflowJohn M Rosenfeld*, Tracy Cooke, Zirong Li, Kan Saito, Konstantin Taganov, Bhaskar Thyagarajan, Alejandra Solache

    From Epigenetics & Chromatin: Interactions and processesBoston, MA, USA. 11-13 March 2013

    The ChIP protocol is a fundamental tool for discoveries inthe area of epigenomics and gaining insight into epigeneticphenomenon. Despite the fact that many vendors of lifescience research tools offer products to support ChIP, verylittle innovation has occurred around the ChIP methoditself to make this process more reproducible and reliable.Issues surrounding antibody specificity and performanceare critical to high resolution genomic mapping of chro-matin events. In addition, reliable high-throughput optionsare not readily available for ChIP despite the ability toautomate parts of the workflow. Chromatin preparation,for example, remains a laborious process and the fieldlacks accepted criteria to make determinations on thequality of chromatin suitable for ChIP.We have engaged in an iterative process of examining

    parameters that influence chromatin fragmentation on avariety of devices and under various buffer systems, andhave developed a protocol for optimizing this process forresearchers new to the area of chromatin biology. As aleading antibody supplier, we have produced tools thatallow researchers to evaluate the specificity of histonemodifications antibodies in their own laboratories utilizinga simple dot blot western blotting approach. In addition,we have developed a new high-throughput and low-cellcapable protocol that simplifies the process, reduces varia-bility and significantly improves signal-to-noise ratio. Thisprotocol is particularly suited for new users/beginners, andcan utilize chromatin derived from cells and tissue. Wepresent data comparing the effect of different sonicationprotocols on ChIP, analysis of user-to-user variation, aswell as methods to optimize and control for factors thatintroduce variability in ChIP.

    Published: 8 April 2013

    doi:10.1186/1756-8935-6-S1-P122Cite this article as: Rosenfeld et al.: Systematic optimization ofparameters involved in preparation of chromatin and chromatinimmunoprecipitation (ChIP) workflow. Epigentics & Chromatin 2013 6(Suppl 1):P122.

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    Epigenetics R&D, EMD Millipore, Temecula, CA, USA

    Rosenfeld et al. Epigentics & Chromatin 2013, 6(Suppl 1):P122

    2013 Rosenfeld et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the CreativeCommons Attribution License (, which permits unrestricted use, distribution, andreproduction in any medium, provided the original work is properly cited.


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