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Waszak, Sebastian M.; Delaneau, Olivier; Gschwind, Andreas R.; Kilpinen, Helena; Raghav, Sunil K.; Witwicki, Robert M.; Orioli, Andrea; Wiederkehr, Michael; Panousis, Nikolaos I.; Yurovsky, Alisa; Romano-Palumbo, Luciana; Planchon, Alexandra; Bielser, Deborah; Padioleau, Ismael; Udin, Gilles; Thurnheer, Sarah; Hacker, David; Hernandez, Nouria; Reymond, Alexandre; Deplancke, Bart; Dermitzakis, Emmanouil T.
Cell, 08/2015, Volume: 162, Issue: 5Journal Article
Chromatin state variation at gene regulatory elements is abundant across individuals, yet we understand little about the genetic basis of this variability. Here, we profiled several histone modifications, the transcription factor (TF) PU.1, RNA polymerase II, and gene expression in lymphoblastoid cell lines from 47 whole-genome sequenced individuals. We observed that distinct cis-regulatory elements exhibit coordinated chromatin variation across individuals in the form of variable chromatin modules (VCMs) at sub-Mb scale. VCMs were associated with thousands of genes and preferentially cluster within chromosomal contact domains. We mapped strong proximal and weak, yet more ubiquitous, distal-acting chromatin quantitative trait loci (cQTL) that frequently explain this variation. cQTLs were associated with molecular activity at clusters of cis-regulatory elements and mapped preferentially within TF-bound regions. We propose that local, sequence-independent chromatin variation emerges as a result of genetic perturbations in cooperative interactions between cis-regulatory elements that are located within the same genomic domain. Display omitted •Modules of correlated molecular phenotypes represent inter-individual chromatin variation•Variable chromatin modules (VCMs) are embedded within chromosomal contact domains•VCMs are orchestrated by cis-acting genetic variation•VCMs rationalize chromatin state changes that are independent of local DNA sequence Spatially defined chromosome regions, termed variable chromatin modules, exhibit coordinated chromatin state changes across cis-regulatory elements. Within these modules, genetic changes distal from the regulatory element itself can induce variation in chromatin patterns between individuals.
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