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This article is part of the supplement: Beyond the Genome 2012

Open Access Open Badges Oral presentation

Ultra-high resolution mapping of protein-genome interactions using ChIP-exo

B Franklin Pugh

  • Correspondence: B Franklin Pugh

Author Affiliations

Penn State University, Biochemistry and Molecular Biology, University Park, PA 16802, USA

BMC Proceedings 2012, 6(Suppl 6):O27  doi:10.1186/1753-6561-6-S6-O27

The electronic version of this article is the complete one and can be found online at:

Published:1 October 2012

© 2012 Pugh; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Oral presentation

With the advent of high-throughput and high resolution genome-wide protein-DNA detection assays, the interrelationships between chromatin and the transcription machinery are now becoming clearer. Here I will discuss our recent findings using MNase ChIP-seq to map nucleosome positions, and a novel ultra-high resolution mapping technique called ChIP-exo that we recently developed [1]. What is apparent from these studies is the following: firstly, transcription factors bind to many more locations in the genome than previously appreciated. Secondly, PICs form at the interface between nucleosomes and nucleosome-free promoter regions. Finally, Chromatin remodeling complexes target specific nucleosome positions, working in concert to organize nucleosomes at the beginning and end of genes. Many remodeler subunits interact asymmetrically with the nucleosome core across the genome, which may be important for the directional passage of RNA polymerase II.


  1. Rhee HS, Pugh BF: Comprehensive genome-wide protein-DNA interactions detected at single-nucleotide resolution.

    Cell 2011, 14:1408. OpenURL