Homo sapiens
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA301216 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR2927515.fastq.gz | Fastqsanger.gz | |||
| SRR2927516.fastq.gz | Fastqsanger.gz | |||
| SRR2927517.fastq.gz | Fastqsanger.gz | |||
| SRR2927518.fastq.gz | Fastqsanger.gz | |||
| SRR2927519.fastq.gz | Fastqsanger.gz |
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Project description:Higher order chromatin structure establishes domains that organize the genome and coordinate gene expression. However, the molecular mechanisms controlling transcription of individual loci within a topological domain (TAD) are not fully understood. The cystic fibrosis transmembrane conductance regulator (CFTR) gene provides a paradigm for investigating these mechanisms. CFTR occupies a TAD bordered by CTCF/cohesin binding sites within which are cell-type-selective cis-regulatory elements for the locus. We showed previously that intronic and extragenic enhancers, when occupied by specific transcription factors, are recruited to the CFTR promoter by a looping mechanism to drive gene expression. Here we use a combination of CRISPR/Cas9 editing of cis-regulatory elements and siRNA-mediated depletion of architectural proteins to determine the relative contribution of structural elements and enhancers to the higher order structure and expression of the CFTR locus. We found the boundaries of the CFTR TAD are conserved among diverse cell types and are dependent on CTCF and cohesin complex. Removal of an upstream CTCF-binding insulator alters the interaction profile, but has little effect on CFTR expression. Within the TAD, intronic enhancers recruit cell-type selective transcription factors and deletion of a pivotal enhancer element dramatically decreases CFTR expression, but has minor effect on its 3D structure. Examination of open chromatin region in Caco2 (colorectal adenocarcinoma cells), HBE (primary human bronchial epithelial cells), and primary adult human epididymis cells
2016-01-07 | E-GEOD-74709 | biostudies-arrayexpress
Project description:Higher order chromatin structure establishes domains that organize the genome and coordinate gene expression. However, the molecular mechanisms controlling transcription of individual loci within a topological domain (TAD) are not fully understood. The cystic fibrosis transmembrane conductance regulator (CFTR) gene provides a paradigm for investigating these mechanisms. CFTR occupies a TAD bordered by CTCF/cohesin binding sites within which are cell-type-selective cis-regulatory elements for the locus. We showed previously that intronic and extragenic enhancers, when occupied by specific transcription factors, are recruited to the CFTR promoter by a looping mechanism to drive gene expression. Here we use a combination of CRISPR/Cas9 editing of cis-regulatory elements and siRNA-mediated depletion of architectural proteins to determine the relative contribution of structural elements and enhancers to the higher order structure and expression of the CFTR locus. We found the boundaries of the CFTR TAD are conserved among diverse cell types and are dependent on CTCF and cohesin complex. Removal of an upstream CTCF-binding insulator alters the interaction profile, but has little effect on CFTR expression. Within the TAD, intronic enhancers recruit cell-type selective transcription factors and deletion of a pivotal enhancer element dramatically decreases CFTR expression, but has minor effect on its 3D structure.
2016-01-07 | GSE74709 | GEO
Project description:Here we examine the mechanisms by which multiple cis-regulatory elements (CREs) at the CFTR locus coordinate its expression in intestinal epithelial cells. Using CRISPR/Cas9 to remove CREs, individually and in tandem, followed by assays of gene expression and higher-order chromatin structure (4C-seq), we reveal the cross-talk and dependency of two cell-specific intronic enhancers. The results also suggest an internal monitoring mechanism at the locus whereby alternative enhancers may be recruited when the normal sites are lost. Of note, activating transcription factors such as FOXA2 may contribute to this mechanism. Also, by deleting the 5' topologically-associating domain (TAD) boundary, we illustrate its relative contribution to normal mechanisms of CFTR gene expression and 3D gene architecture.
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Project description:The cystic fibrosis transmembrane conductance regulator (CFTR) gene lies within a TAD in which multiple cis-regulatory elements (CREs) and transcription factors (TFs) regulate its cell-specific expression. The CREs are recruited to the gene promoter by a looping mechanism that depends upon both architectural proteins and specific TFs. An siRNA screen to identify TFs coordinating CFTR expression in airway epithelial cells suggested an activating role for BTB Domain and CNC Homolog 1 (BACH1). BACH1 is a ubiquitous master regulator of the cellular response to oxidative stress. Here we show that BACH1 may have a dual effect on CFTR expression by direct occupancy of CREs at physiological oxygen (~8%), while indirectly modulating expression under conditions of oxidative stress. Hence BACH1, can activate or repress the same gene, to fine tune expression in response to environmental cues such as cell stress. Furthermore, our 4C-seq data suggest that BACH1 can also directly regulate CFTR gene expression by modulating locus architecture through occupancy at known enhancers and structural elements, and depletion of BACH1 alters the higher order chromatin structure.
2021-11-17 | GSE165717 | GEO
Project description:The cystic fibrosis transmembrane conductance regulator (CFTR) gene lies within a TAD in which multiple cis-regulatory elements (CREs) and transcription factors (TFs) regulate its cell-specific expression. The CREs are recruited to the gene promoter by a looping mechanism that depends upon both architectural proteins and specific TFs. An siRNA screen to identify TFs coordinating CFTR expression in airway epithelial cells suggested an activating role for BTB Domain and CNC Homolog 1 (BACH1). BACH1 is a ubiquitous master regulator of the cellular response to oxidative stress. Here we show that BACH1 may have a dual effect on CFTR expression by direct occupancy of CREs at physiological oxygen (~8%), while indirectly modulating expression under conditions of oxidative stress. Hence BACH1, can activate or repress the same gene, to fine tune expression in response to environmental cues such as cell stress. Furthermore, our 4C-seq data suggest that BACH1 can also directly regulate CFTR gene expression by modulating locus architecture through occupancy at known enhancers and structural elements, and depletion of BACH1 alters the higher order chromatin structure.
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Project description:The cystic fibrosis transmembrane conductance regulator (CFTR) gene lies within a TAD in which multiple cis-regulatory elements (CREs) and transcription factors (TFs) regulate its cell-specific expression. The CREs are recruited to the gene promoter by a looping mechanism that depends upon both architectural proteins and specific TFs. An siRNA screen to identify TFs coordinating CFTR expression in airway epithelial cells suggested an activating role for BTB Domain and CNC Homolog 1 (BACH1). BACH1 is a ubiquitous master regulator of the cellular response to oxidative stress. Here we show that BACH1 may have a dual effect on CFTR expression by direct occupancy of CREs at physiological oxygen (~8%), while indirectly modulating expression under conditions of oxidative stress. Hence BACH1, can activate or repress the same gene, to fine tune expression in response to environmental cues such as cell stress. Furthermore, our 4C-seq data suggest that BACH1 can also directly regulate CFTR gene expression by modulating locus architecture through occupancy at known enhancers and structural elements, and depletion of BACH1 alters the higher order chromatin structure.
2021-11-17 | GSE165718 | GEO
Project description:Transcription of the cystic fibrosis transmembrane conductance regulator (CFTR) gene is regulated by a set of ubiquitous and cell-type selective cis-regulatory elements (CREs). These elements include extragenic and intronic enhancers that bind cell-type specific transcription factors, as well as architectural protein bound structural elements. We previously reported that loss of the airway-selective -35kb enhancer in 16HBE14o- airway epithelial cells disrupts normal enhancer-promoter looping at the CFTR locus and nearly abolishes its expression. Here we expand on previous work, and explore the effect of relocation of the 500bp -35kb enhancer core to an ectopic site in intron 1 of CFTR on gene expression and chromatin dynamics. We find that although genomic relocation of this element is not able to fully restore CFTR expression to wild-type levels, the -35kb sequence is able establish a de novo enhancer signature at chromatin at the site of insertion. Additionally, the relocated -35kb enhancer is able to form chromatin contacts with known CFTR CREs. These studies reveal important direct chromatin effects, as well as limitations, of CFTR enhancers, and provide important considerations when targeting the CFTR locus for novel therapeutic gene editing.
2022-12-13 | GSE203559 | GEO
Project description:Transcription of the cystic fibrosis transmembrane conductance regulator (CFTR) gene is regulated by a set of ubiquitous and cell-type selective cis-regulatory elements (CREs). These elements include extragenic and intronic enhancers that bind cell-type specific transcription factors, as well as architectural protein bound structural elements. We previously reported that loss of the airway-selective -35kb enhancer in 16HBE14o- airway epithelial cells disrupts normal enhancer-promoter looping at the CFTR locus and nearly abolishes its expression. Here we expand on previous work, and explore the effect of relocation of the 500bp -35kb enhancer core to an ectopic site in intron 1 of CFTR on gene expression and chromatin dynamics. We find that although genomic relocation of this element is not able to fully restore CFTR expression to wild-type levels, the -35kb sequence is able establish a de novo enhancer signature at chromatin at the site of insertion. Additionally, the relocated -35kb enhancer is able to form chromatin contacts with known CFTR CREs. These studies reveal important direct chromatin effects, as well as limitations, of CFTR enhancers, and provide important considerations when targeting the CFTR locus for novel therapeutic gene editing.
2022-12-13 | GSE203558 | GEO
Project description:The airway epithelial cell line, 16HBE14o-, is an important cell model for studying airway disease. 16HBE14o- cells were originally generated from primary human bronchial epithelial cells by SV40-mediated immortalization, a process that is associated with genomic instability through long-term culture. Here we explore the heterogeneity of these cells, with respect to expression of the cystic fibrosis transmembrane conductance regulator (CFTR) transcript and protein. We isolate clones of 16HBE14o- with stably higher and lower levels of CFTR in comparison to bulk 16HBE14o-, designated CFTRhigh and CFTRlow. Detailed characterization of the CFTR locus in these clones by ATAC-seq and 4C-seq showed open chromatin profiles and higher order chromatin structure that correlate with CFTR expression levels. . Transcriptomic profiling of CFTRhigh and CFTRlow cells showed that the CFTRhigh cells had an elevated inflammatory/ innate immune response phenotype. These results encourage caution in interpreting functional data from clonal lines of 16HBE14o- cells, generated after genomic or other manipulations.
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Project description:The airway epithelial cell line, 16HBE14o-, is an important cell model for studying airway disease. 16HBE14o- cells were originally generated from primary human bronchial epithelial cells by SV40-mediated immortalization, a process that is associated with genomic instability through long-term culture. Here we explore the heterogeneity of these cells, with respect to expression of the cystic fibrosis transmembrane conductance regulator (CFTR) transcript and protein. We isolate clones of 16HBE14o- with stably higher and lower levels of CFTR in comparison to bulk 16HBE14o-, designated CFTRhigh and CFTRlow. Detailed characterization of the CFTR locus in these clones by ATAC-seq and 4C-seq showed open chromatin profiles and higher order chromatin structure that correlate with CFTR expression levels. . Transcriptomic profiling of CFTRhigh and CFTRlow cells showed that the CFTRhigh cells had an elevated inflammatory/ innate immune response phenotype. These results encourage caution in interpreting functional data from clonal lines of 16HBE14o- cells, generated after genomic or other manipulations.
2023-06-07 | GSE220853 | GEO