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Quantifying ChIP-seq data: A spiking method providing an internal reference for sample-to-sample normalization

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  • Nicolas Bonhoure
  • Gergana Bounova
  • David Bernasconi
  • Viviane Praz
  • Fabienne Lammers
  • Donatella Canella
  • Ian M. Willis
  • Winship Herr
  • Nouria Hernandez
  • Mauro Delorenzi
  • Bart Deplancke
  • Béatrice Desvergne
  • Nicolas Guex
  • Felix Naef
  • Jacques Rougemont
  • Ueli Schibler
  • Teemu Andersin
  • Pascal Cousin
  • Federica Gilardi
  • Pascal Gos
  • Sunil Raghav
  • Dominic Villeneuve
  • Roberto Fabbretti
  • Volker Vlegel
  • Ioannis Xenarios
  • Eugenia Migliavacca
  • Fabrice David
  • Yohan Jarosz
  • Dmitry Kuznetsov
  • Robin Liechti
  • Olivier Martin
  • Julien Delafontaine
  • Julia Cajan
  • Kyle Gustafson
  • Irina Krier
  • Marion Leleu
  • Aurélien Naldi
  • Leonor Rib
  • Laura Symul

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    Rights statement: This article, published in Genome Research, is available under a Creative Commons License (Attribution-NonCommercial 4.0 International), as described at http://creativecommons.org/licenses/by-nc/4.0/.

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Original languageEnglish
Pages (from-to)1157-1168
Number of pages12
JournalGenome Research
Volume24
Issue number7
DOIs
Publication statusPublished - 1 Jan 2014

Abstract

Chromatin immunoprecipitation followed by deep sequencing (ChIP-seq) experiments are widely used to determine, within entire genomes, the occupancy sites of any protein of interest, including, for example, transcription factors, RNA polymerases, or histones with or without various modifications. In addition to allowing the determination of occupancy sites within one cell type and under one condition, this method allows, in principle, the establishment and comparison of occupancy maps in various cell types, tissues, and conditions. Such comparisons require, however, that samples be normalized. Widely used normalization methods that include a quantile normalization step perform well when factor occupancy varies at a subset of sites, but may miss uniform genome-wide increases or decreases in site occupancy. We describe a spike adjustment procedure (SAP) that, unlike commonly used normalization methods intervening at the analysis stage, entails an experimental step prior to immunoprecipitation. A constant, low amount from a single batch of chromatin of a foreign genome is added to the experimental chromatin. This "spike" chromatin then serves as an internal control to which the experimental signals can be adjusted. We show that the method improves similarity between replicates and reveals biological differences including global and largely uniform changes.

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