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.

Active and poised promoter states drive folding of the extended HoxB locus in mouse embryonic stem cells / Barbieri, Mariano; Xie, Sheila Q; Torlai Triglia, Elena; Chiariello, ANDREA MARIA; Bianco, Simona; de Santiago, Inês; Branco, Miguel R; Rueda, David; Nicodemi, Mario; Pombo, Ana. - In: NATURE STRUCTURAL & MOLECULAR BIOLOGY. - ISSN 1545-9993. - 24:6(2017), pp. 515-524-524. [10.1038/nsmb.3402]

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

BARBIERI, MARIANO;CHIARIELLO, ANDREA MARIA;BIANCO, SIMONA;NICODEMI, MARIO;
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.
2017
Active and poised promoter states drive folding of the extended HoxB locus in mouse embryonic stem cells / Barbieri, Mariano; Xie, Sheila Q; Torlai Triglia, Elena; Chiariello, ANDREA MARIA; Bianco, Simona; de Santiago, Inês; Branco, Miguel R; Rueda, David; Nicodemi, Mario; Pombo, Ana. - In: NATURE STRUCTURAL & MOLECULAR BIOLOGY. - ISSN 1545-9993. - 24:6(2017), pp. 515-524-524. [10.1038/nsmb.3402]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/678851
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