Comparative epigenomic annotation of regulatory DNA

Shu Xiao, Dan Xie, Xiaoyi Cao, Pengfei Yu, Xiaoyun Xing, Chieh Chun Chen, Meagan Musselman, Mingchao Xie, Franklin D. West, Harris A. Lewin, Ting Wang, Sheng Zhong

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114 Scopus citations


Despite the explosive growth of genomic data, functional annotation of regulatory sequences remains difficult. Here, we introduce "comparative epigenomics" - interspecies comparison of DNA and histone modifications - as an approach for annotation of the regulatory genome. We measured in human, mouse, and pig pluripotent stem cells the genomic distributions of cytosine methylation, H2A.Z, H3K4me1/2/3, H3K9me3, H3K27me3, H3K27ac, H3K36me3, transcribed RNAs, and P300, TAF1, OCT4, and NANOG binding. We observed that epigenomic conservation was strong in both rapidly evolving and slowly evolving DNA sequences, but not in neutrally evolving sequences. In contrast, evolutionary changes of the epigenome and the transcriptome exhibited a linear correlation. We suggest that the conserved colocalization of different epigenomic marks can be used to discover regulatory sequences. Indeed, seven pairs of epigenomic marks identified exhibited regulatory functions during differentiation of embryonic stem cells into mesendoderm cells. Thus, comparative epigenomics reveals regulatory features of the genome that cannot be discerned from sequence comparisons alone.

Original languageEnglish
Pages (from-to)1381-1392
Number of pages12
Issue number6
StatePublished - Jun 8 2012

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    Xiao, S., Xie, D., Cao, X., Yu, P., Xing, X., Chen, C. C., Musselman, M., Xie, M., West, F. D., Lewin, H. A., Wang, T., & Zhong, S. (2012). Comparative epigenomic annotation of regulatory DNA. Cell, 149(6), 1381-1392.