Abstract
Cys2-His2 zinc finger (C2H2-ZF) proteins represent the largest class of putative human transcription factors. However, for most C2H2-ZF proteins it is unknown whether they even bind DNA or, if they do, to which sequences. Here, by combining data from a modified bacterial one-hybrid system with protein-binding microarray and chromatin immunoprecipitation analyses, we show that natural C2H2-ZFs encoded in the human genome bind DNA both in vitro and in vivo, and we infer the DNA recognition code using DNA-binding data for thousands of natural C2H2-ZF domains. In vivo binding data are generally consistent with our recognition code and indicate that C2H2-ZF proteins recognize more motifs than all other human transcription factors combined. We provide direct evidence that most KRAB-containing C2H2-ZF proteins bind specific endogenous retroelements (EREs), ranging from currently active to ancient families. The majority of C2H2-ZF proteins, including KRAB proteins, also show widespread binding to regulatory regions, indicating that the human genome contains an extensive and largely unstudied adaptive C2H2-ZF regulatory network that targets a diverse range of genes and pathways.
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Acknowledgements
We are grateful to S. Wolfe for providing B1H reagents and protocols, F. Aidoo, H. Zheng, H. Tang, P. Young, T. Kanagalingam, D. Torti and the Donnelly Sequencing Centre for technical support, and E. Chan, H. van Bakel and X. Chen for computational support and analyses. This work was supported by grants from the Canadian Institutes of Health Research (MOP-77721 and MOP-111007 to T.R.H., MOP-272138 to T.R.H., J.G. and Andrew Emili), and funding from the Canadian Institutes for Advanced Research to T.R.H., B.J.F. and M.T.W. H.S.N. was supported by a Canadian Institutes of Health Research Banting Fellowship, F.W.S. by a European Molecular Biology Organization postdoctoral fellowship, and K.N.L. by a Natural Science and Engineering Research Council CGS-M.
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H.S.N., S.M., F.W.S. and T.R.H. conceived and designed the experiments. S.M. performed the B1H experiments, with contributions from K.N.L. F.W.S. performed the ChIP-seq experiments, with contributions from E.R. S.M. and A.Y. performed the PBM experiments. H.S.N. analyzed the data and developed the computational models. M.G. performed the structural modeling. M.A., M.T.W. and T.R.H. contributed to data analysis. J.G. contributed reagents and materials. P.M.K., J.G. and B.J.F. provided critical advice and commentary on data analysis. H.S.N. prepared the figures. T.R.H. conceived the study and supervised the project, and H.S.N. and T.R.H. wrote the manuscript.
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Najafabadi, H., Mnaimneh, S., Schmitges, F. et al. C2H2 zinc finger proteins greatly expand the human regulatory lexicon. Nat Biotechnol 33, 555–562 (2015). https://doi.org/10.1038/nbt.3128
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DOI: https://doi.org/10.1038/nbt.3128
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