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2016 ; 63
(6
): 1080-8
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Elucidating Combinatorial Chromatin States at Single-Nucleosome Resolution
#MMPMID27496019
Sadeh R
; Launer-Wachs R
; Wandel H
; Rahat A
; Friedman N
Mol Cell
2016[Sep]; 63
(6
): 1080-8
PMID27496019
show ga
Chromatin immunoprecipitation followed by sequencing (ChIP-seq) has been
instrumental to our current view of chromatin structure and function. It allows
genome-wide mapping of histone marks, which demarcate biologically relevant
domains. However, ChIP-seq is an ensemble measurement reporting the average
occupancy of individual marks in a cell population. Consequently, our
understanding of the combinatorial nature of chromatin states relies almost
exclusively on correlation between the genomic distributions of individual marks.
Here, we report the development of combinatorial-iChIP to determine the
genome-wide co-occurrence of histone marks at single-nucleosome resolution. By
comparing to a null model, we show that certain combinations of overlapping marks
(H3K36me3 and H3K79me3) co-occur more frequently than would be expected by
chance, while others (H3K4me3 and H3K36me3) do not, reflecting differences in the
underlying chromatin pathways. We further use combinatorial-iChIP to illuminate
aspects of the Set2-RPD3S pathway. This approach promises to improve our
understanding of the combinatorial complexity of chromatin.