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Active and poised promoter states drive folding of the extended HoxB locus in mouse embryonic stem cells

Official URL:https://doi.org/10.1038/nsmb.3402
PubMed:View item in PubMed
Creators Name:Barbieri, M. and Xie, S.Q. and Torlai Triglia, E. and Chiariello, A.M. and Bianco, S. and de Santiago, I. and Branco, M.R. and Rueda, D. and Nicodemi, M. and Pombo, A.
Journal Title:Nature Structural & Molecular Biology
Journal Abbreviation:Nat Struct Mol Biol
Volume:24
Number:6
Page Range:515-524
Date:June 2017
Abstract:Gene expression states influence the 3D conformation of the genome through poorly understood mechanisms. Here, we investigate the conformation of the murine HoxB locus, a gene-dense genomic region containing closely spaced genes with distinct activation states in mouse embryonic stem (ES) cells. To predict possible folding scenarios, we performed computer simulations of polymer models informed with different chromatin occupancy features that define promoter activation states or binding sites for the transcription factor CTCF. Single-cell imaging of the locus folding was performed to test model predictions. While CTCF occupancy alone fails to predict the in vivo folding at genomic length scale of 10 kb, we found that homotypic interactions between active and Polycomb-repressed promoters co-occurring in the same DNA fiber fully explain the HoxB folding patterns imaged in single cells. We identify state-dependent promoter interactions as major drivers of chromatin folding in gene-dense regions.
ISSN:1545-9993
Publisher:Nature Publishing Group (U.K.)
Additional Information:http://biorxiv.org/content/early/2017/02/28/111773
Item Type:Article

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