High-resolution changes in chromatin organization throughout breast cancer progression
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA1068193 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| Other | ||||
| SRR27704551_1.fastq.gz | Fastqsanger.gz | |||
| SRR27704551_2.fastq.gz | Fastqsanger.gz | |||
| SRR27704552_1.fastq.gz | Fastqsanger.gz | |||
| SRR27704552_2.fastq.gz | Fastqsanger.gz |
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Project description:To explore how chromatin structure and epigenetic parameters of genome architecture changes during cancer progression at a fine scale and genome-wide, we generated high-resolution Micro-C contact maps in non-malignant, pre-cancerous, and metastatic MCF10 breast cancer epithelial cells. We profiled progression-associated reorganization of chromatin compartments, topologically associated domains (TADs), and chromatin loops, and also identified invariable chromatin features. We find large-scale compartmental shifts occur predominantly in early stages of cancer development, with more fine-scale structural changes in TADs and looping accumulating during the later transition to metastasis. We related these structural features to changes in gene expression, histone marks, and potential enhancers and found a large portion of differentially expressed genes physically connected to distal regulatory elements. While changes in chromatin loops were relatively rare during progression, differential loops were enriched for progression-associated genes, including those involved in proliferation, angiogenesis, and differentiation. Changes in either enhancer-promoter contacts or distal enhancer activity were accompanied by differential gene regulation, suggesting that changes in chromatin contacts are not necessary but can be sufficient for gene regulation. Together, our results demonstrate a functionally relevant connection between gene regulation and genome remodeling at many key genes during cancer progression. This SuperSeries is composed of the SubSeries listed below.
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Project description:To explore how chromatin structure and epigenetic parameters of genome architecture changes during cancer progression at a fine scale and genome-wide, we generated high-resolution Micro-C contact maps in non-malignant, pre-cancerous, and metastatic MCF10 breast cancer epithelial cells. We profiled progression-associated reorganization of chromatin compartments, topologically associated domains (TADs), and chromatin loops, and also identified invariable chromatin features. We find large-scale compartmental shifts occur predominantly in early stages of cancer development, with more fine-scale structural changes in TADs and looping accumulating during the later transition to metastasis. We related these structural features to changes in gene expression, histone marks, and potential enhancers and found a large portion of differentially expressed genes physically connected to distal regulatory elements. While changes in chromatin loops were relatively rare during progression, differential loops were enriched for progression-associated genes, including those involved in proliferation, angiogenesis, and differentiation. Changes in either enhancer-promoter contacts or distal enhancer activity were accompanied by differential gene regulation, suggesting that changes in chromatin contacts are not necessary but can be sufficient for gene regulation. Together, our results demonstrate a functionally relevant connection between gene regulation and genome remodeling at many key genes during cancer progression.
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Project description:Recent molecular advancements have revolutionized our understanding of the role of three-dimensional (3D) genome organization in gene regulation. Yet, the impact of acute hormonal signaling on reshaping genome structure and its consequences for metabolic processes remain largely unexplored. β3-adrenergic receptor (β3-AR) hormonal signaling is imperative for brown adipose tissue (BAT) thermogenesis. Here, we demonstrate that β3-AR signaling induces rapid reorganization of fine-scale genome architecture in murine and human brown adipocytes within four hours. High-resolution Micro-C profiling reveals dynamic chromatin loop formation associated with activation of thermogenic genes. Mechanistically, β3-AR signaling promotes p18Hamlet/SRCAP complex assembly, catalyzing incorporation of the histone variant H2A.Z into nucleosomes. ATAC-sequencing reveals that H2A.Z enhances chromatin accessibility at loop anchors, supporting loop formation by facilitating the recruitment of looping factors such as the Mediator complex. Disruption of H2A.Z compromises dynamic chromatin looping and transcriptional activation of thermogenic genes in both species. Mice with BAT-specific H2A.Z deficiency exhibit reduced thermogenic activity and impaired glucose tolerance. Revisiting genome-wide association study analysis reveals that H2A.Z-occupied loops are linked to genetic variants associated with obesity and its related metabolic disorders. Together, these findings highlight the rapid adaptability of 3D genome organization to acute β3-AR signaling and its critical role in brown adipocyte thermoregulation.
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