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Related Concept Videos

Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
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Epigenetic Regulation01:37

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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
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Systems Biology of Metabolic Regulation by Estrogen Receptor Signaling in Breast Cancer
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Nonlinear relationship between chromatin accessibility and estradiol-regulated gene expression.

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Estradiol (E2) regulates gene expression in breast cancer by altering chromatin accessibility. Surprisingly, many E2-regulated genes remain inaccessible even when active, revealing complex ER-E2 interactions with chromatin.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Cancer Research

Background:

  • Chromatin accessibility is crucial for regulating gene expression in breast cancer.
  • Estrogen receptor (ER) signaling, driven by estradiol (E2), plays a key role in ER-positive breast cancer.

Purpose of the Study:

  • To investigate the impact of E2 on chromatin accessibility and ERα binding in ER-positive breast cancer cells.
  • To understand the mechanisms underlying E2-regulated gene expression and chromatin dynamics.

Main Methods:

  • Performed ATAC-seq experiments in MCF-7 cells treated with E2.
  • Integrated ATAC-seq data with ERα ChIP-seq, MNase-seq, and DNase-seq data.
  • Analyzed chromatin accessibility and transcription factor binding sites.

Main Results:

  • E2 induced chromatin accessibility changes in a subset of E2-regulated genes, with specific transcription factor enrichments.
  • Despite E2 treatment, a significant proportion of E2-inducible genes exhibited closed chromatin configurations.
  • Approximately 40% of ERα binding sites were located in ATAC-seq inaccessible regions, enriched for various nuclear receptors and pioneer factors.

Conclusions:

  • ER-E2 interactions with chromatin are complex, with "closed" chromatin not always correlating with gene inactivity.
  • ATAC-seq may have technical limitations in detecting accessibility at all ERα-bound regions.
  • Findings challenge conventional understanding of chromatin accessibility in gene regulation.