We present CisGenome, a software system for analyzing genome-wide chromatin immunoprecipitation (ChIP) data. CisGenome is designed to meet all basic needs of ChIP data analyses, including visualization, data normalization, peak detection, false discovery rate computation, gene-peak association, and sequence and motif analysis. In addition to implementing previously published ChIP–microarray (ChIP-chip) analysis methods, the software contains statistical methods designed specifically for ChlP sequencing (ChIP-seq) data obtained by coupling ChIP with massively parallel sequencing. The modular design of CisGenome enables it to support interactive analyses through a graphic user interface as well as customized batch-mode computation for advanced data mining. A built-in browser allows visualization of array images, signals, gene structure, conservation, and DNA sequence and motif information. We demonstrate the use of these tools by a comparative analysis of ChIP-chip and ChIP-seq data for the transcription factor NRSF/REST, a study of ChIP-seq analysis with or without a negative control sample, and an analysis of a new motif in Nanog- and Sox2-binding regions.
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We thank W. Li for assistance with analyzing the ChIP-chip spike-in data. This research was supported by National Institutes of Health grant HG003903 (to W.H.W.) and the National Human Genome Research Institute's ENCODE project (to R.M.M.). H. Ji is partially supported by the Johns Hopkins Bloomberg School of Public Health Richard L. Gelb Cancer Research Fund.
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Ji, H., Jiang, H., Ma, W. et al. An integrated software system for analyzing ChIP-chip and ChIP-seq data. Nat Biotechnol 26, 1293–1300 (2008). https://doi.org/10.1038/nbt.1505
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