Similar Datasets
Project description:The genome adopts varied and specific 3D conformations in different cell types. The loop extruding factor, cohesin, is thought to play a key role in the formation of this 3D structure, however it is unknown how cell-type specificity is achieved. One proposed mechanism is that cis-regulatory elements, which are active in unique combinations in different cell types, recruit cohesin and therefore direct the formation of specific 3D conformation. We have identified genome-wide natural variation in enhancer sites in healthy human donors, by performing cohesin ChIP-seq in these cells we show that cohesin occupancy is directly correlated with enhancer activity. Identification of the genetic variants associated with the gain or loss of enhancer-like elements and associating this with the recruitment of cohesin provides evidence of a direct link between widespread genetic variation in the non-coding genome and cell-specific changes in 3D genome organization. Therefore, enhancer elements have evolved not only the ability to upregulate transcription at promoters, but also the ability to stimulate the mechanisms that insure robust interactions between them. Next, using enhancer KO models in the well characterised alpha globin locus, we show how cohesin recruitment and 3D genome organization correlates with changes in the local regulatory landscape. We then selected the strongest of the alpha globin enhancers and inserted it into a neutral region of the genome, to test if a single active enhancer was capable of recruiting cohesin and initiating the formation of a 3D chromatin domain when isolated from its native context. Our results show that an enhancer is able to direct the recruitment of cohesin when in an active state and that this is correlated with changes in the local chromatin environment, giving rise to open chromatin sites and de novo chromatin interactions in an otherwise “neutral” region of the genome. These results support the hypothesis that tissue-specific recruitment of cohesin is facilitated by enhancers and that this plays a role in establishing cell-specific changes in 3D genome conformation.
2023-10-13 | GSE244928 | GEO
Project description:The genome adopts varied and specific 3D conformations in different cell types. The loop extruding factor, cohesin, is thought to play a key role in the formation of this 3D structure, however it is unknown how cell-type specificity is achieved. One proposed mechanism is that cis-regulatory elements, which are active in unique combinations in different cell types, recruit cohesin and therefore direct the formation of specific 3D conformation. We have identified genome-wide natural variation in enhancer sites in healthy human donors, by performing cohesin ChIP-seq in these cells we show that cohesin occupancy is directly correlated with enhancer activity. Identification of the genetic variants associated with the gain or loss of enhancer-like elements and associating this with the recruitment of cohesin provides evidence of a direct link between widespread genetic variation in the non-coding genome and cell-specific changes in 3D genome organization. Therefore, enhancer elements have evolved not only the ability to upregulate transcription at promoters, but also the ability to stimulate the mechanisms that insure robust interactions between them. Next, using enhancer KO models in the well characterised alpha globin locus, we show how cohesin recruitment and 3D genome organization correlates with changes in the local regulatory landscape. We then selected the strongest of the alpha globin enhancers and inserted it into a neutral region of the genome, to test if a single active enhancer was capable of recruiting cohesin and initiating the formation of a 3D chromatin domain when isolated from its native context. Our results show that an enhancer is able to direct the recruitment of cohesin when in an active state and that this is correlated with changes in the local chromatin environment, giving rise to open chromatin sites and de novo chromatin interactions in an otherwise “neutral” region of the genome. These results support the hypothesis that tissue-specific recruitment of cohesin is facilitated by enhancers and that this plays a role in establishing cell-specific changes in 3D genome conformation.
2023-10-13 | GSE244927 | GEO
Project description:The genome adopts varied and specific 3D conformations in different cell types. The loop extruding factor, cohesin, is thought to play a key role in the formation of this 3D structure, however it is unknown how cell-type specificity is achieved. One proposed mechanism is that cis-regulatory elements, which are active in unique combinations in different cell types, recruit cohesin and therefore direct the formation of specific 3D conformation. We have identified genome-wide natural variation in enhancer sites in healthy human donors, by performing cohesin ChIP-seq in these cells we show that cohesin occupancy is directly correlated with enhancer activity. Identification of the genetic variants associated with the gain or loss of enhancer-like elements and associating this with the recruitment of cohesin provides evidence of a direct link between widespread genetic variation in the non-coding genome and cell-specific changes in 3D genome organization. Therefore, enhancer elements have evolved not only the ability to upregulate transcription at promoters, but also the ability to stimulate the mechanisms that insure robust interactions between them. Next, using enhancer KO models in the well characterised alpha globin locus, we show how cohesin recruitment and 3D genome organization correlates with changes in the local regulatory landscape. We then selected the strongest of the alpha globin enhancers and inserted it into a neutral region of the genome, to test if a single active enhancer was capable of recruiting cohesin and initiating the formation of a 3D chromatin domain when isolated from its native context. Our results show that an enhancer is able to direct the recruitment of cohesin when in an active state and that this is correlated with changes in the local chromatin environment, giving rise to open chromatin sites and de novo chromatin interactions in an otherwise “neutral” region of the genome. These results support the hypothesis that tissue-specific recruitment of cohesin is facilitated by enhancers and that this plays a role in establishing cell-specific changes in 3D genome conformation.
2023-10-13 | GSE244926 | GEO
Project description:The genome adopts varied and specific 3D conformations in different cell types. The loop extruding factor, cohesin, is thought to play a key role in the formation of this 3D structure, however it is unknown how cell-type specificity is achieved. One proposed mechanism is that cis-regulatory elements, which are active in unique combinations in different cell types, recruit cohesin and therefore direct the formation of specific 3D conformation. We have identified genome-wide natural variation in enhancer sites in healthy human donors, by performing cohesin ChIP-seq in these cells we show that cohesin occupancy is directly correlated with enhancer activity. Identification of the genetic variants associated with the gain or loss of enhancer-like elements and associating this with the recruitment of cohesin provides evidence of a direct link between widespread genetic variation in the non-coding genome and cell-specific changes in 3D genome organization. Therefore, enhancer elements have evolved not only the ability to upregulate transcription at promoters, but also the ability to stimulate the mechanisms that insure robust interactions between them. Next, using enhancer KO models in the well characterised alpha globin locus, we show how cohesin recruitment and 3D genome organization correlates with changes in the local regulatory landscape. We then selected the strongest of the alpha globin enhancers and inserted it into a neutral region of the genome, to test if a single active enhancer was capable of recruiting cohesin and initiating the formation of a 3D chromatin domain when isolated from its native context. Our results show that an enhancer is able to direct the recruitment of cohesin when in an active state and that this is correlated with changes in the local chromatin environment, giving rise to open chromatin sites and de novo chromatin interactions in an otherwise “neutral” region of the genome. These results support the hypothesis that tissue-specific recruitment of cohesin is facilitated by enhancers and that this plays a role in establishing cell-specific changes in 3D genome conformation.
2023-10-13 | GSE244925 | GEO
Project description:Active regulatory elements recruit cohesin to establish cell-specific chromatin domains.
| PRJNA1026164 | ENA
Project description:Active regulatory elements recruit cohesin to establish cell-specific chromatin domains [Capture-C]
| PRJNA1026170 | ENA
Project description:Active regulatory elements recruit cohesin to establish cell-specific chromatin domains [ATAC-seq]
| PRJNA1026172 | ENA
Project description:Active regulatory elements recruit cohesin to establish cell-specific chromatin domains [ChIP-seq]
| PRJNA1026173 | ENA
Project description:Active regulatory elements recruit cohesin to establish cell-specific chromatin domains [RNA-seq]
| PRJNA1026171 | ENA
Project description:DNA segments that actively regulate transcription in vivo are typically characterized by eviction of nucleosomes from chromatin and are experimentally identified by their hypersensitivity to nucleases. Here we demonstrate a simple procedure for the isolation of nucleosome-depleted DNA from human chromatin, termed FAIRE (Formaldehyde-Assisted Isolation of Regulatory Elements). To perform FAIRE, chromatin is crosslinked with formaldehyde in vivo, sheared by sonication, and phenol-chloroform extracted. The DNA recovered in the aqueous phase is fluorescently labeled and hybridized to a DNA microarray. FAIRE performed in human cells strongly enriches DNA coincident with the location of DNaseI hypersensitive sites, transcriptional start sites, and active promoters. Evidence for cell-type-specific patterns of FAIRE enrichment is also presented. FAIRE has utility as a positive selection for genomic regions associated with regulatory activity, including regions traditionally detected by nuclease hypersensitivity assays.
| S-EPMC1891346 | biostudies-literature