Current methods for whole-genome mapping of protein-DNA interactions, performed by coupling chromatin immunoprecipitation with high-throughput sequencing (ChIP-seq), require large amounts of starting materials, which precludes their application to rare cell types. Here we combine a high-sensitivity ChIP assay with a new library preparation procedure to map histone modifications in as few as 10,000 cells. We used the technique to characterize mouse hematopoietic progenitors and thereby gain insight into their developmental program.
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Gene Expression Omnibus
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We thank D. Flowers and I. Bernstein for expertise, reagents and assistance in isolation of hematopoietic cells, N. Shoresh and T. Mikkelsen for computational assistance and B. Knoechel, E. Mendenhall, A. Goren and A. Chi for constructive discussions and critical reading of the manuscript. This research was supported by funds from the Starr Cancer Consortium, a Charles E. Culpeper Scholarship, the US National Human Genome Research Institute, the National Institutes of Health Roadmap for Epigenomics and the National Heart, Lung, and Blood Institute.
M.A. and B.E.B. have filed a patent application describing the methods presented here (US 12/699,508).
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Adli, M., Zhu, J. & Bernstein, B. Genome-wide chromatin maps derived from limited numbers of hematopoietic progenitors. Nat Methods 7, 615–618 (2010). https://doi.org/10.1038/nmeth.1478
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