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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. 
Topologically Associated Domains (TADs)
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Chromatin Structure Regulates pre-mRNA Processing02:41

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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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Heterochromatin02:38

Heterochromatin

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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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Transducer Mechanism: Nuclear Receptors01:31

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Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
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Target Cell Response to Hormones01:22

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Hormones intricately bind to receptors on the surface or within target cells, initiating a cascade of cellular responses.
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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
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Progesterone receptor interaction with chromatin.

Guillermo P Vicent1, A Silvina Nacht, Cecilia Ballaré

  • 1Centre for Genomic Regulation (CRG) and UPF, Dr Aiguader 88, E-08003, Barcelona, Spain, guillermo.vicent@crg.es.

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Breast cancer cells utilize progesterone receptor binding to nucleosomes for gene regulation, revealing how chromatin organization influences cell identity and transcription factor accessibility.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Cell Biology

Background:

  • Eukaryotic gene regulation depends on transcription factors accessing DNA within chromatin.
  • Cell-type specific gene expression is often attributed to distinct transcription factor repertoires.
  • Pioneer transcription factors can bind nucleosomes and open chromatin, facilitating access for other factors.

Purpose of the Study:

  • To investigate the role of chromatin organization in cell identity and gene regulation.
  • To understand how transcription factors interact with DNA packaged in nucleosomes.
  • To explore the mechanisms of gene regulation in breast cancer cells.

Main Methods:

  • Studied the interaction of progesterone receptor with the genome.
  • Utilized breast cancer cell models.
  • Analyzed DNA-protein interactions within nucleosomes.

Main Results:

  • Progesterone receptor preferentially binds to DNA sites organized within nucleosomes.
  • Nucleosome organization contributes to functional interactions driving gene regulation.
  • This binding preference plays a role in cell identity.

Conclusions:

  • Chromatin organization, specifically nucleosome positioning, is a key determinant of gene accessibility and cell identity.
  • Progesterone receptor's interaction with nucleosomal DNA is crucial for gene regulation in breast cancer.
  • The study provides insights into the interplay between transcription factors, chromatin structure, and cell-specific gene expression.