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Related Concept Videos

Chromatin Structure Regulates pre-mRNA Processing02:41

Chromatin Structure Regulates pre-mRNA Processing

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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.
The chromatin structure, especially...
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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 process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
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CRISPR-Mediated Reorganization of Chromatin Loop Structure
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CTCF-RNA interactions orchestrate cell-specific chromatin loop organization.

Kimberly Lucero1,2, Sungwook Han2,3,4, Pin-Yao Huang2

  • 1Department of Cell Biology and Regenerative Medicine, New York University Langone Medical Center, New York, NY, USA.

Biorxiv : the Preprint Server for Biology
|April 1, 2025
PubMed
Summary
This summary is machine-generated.

CCCTC-binding factor (CTCF) RNA interactions are vital for maintaining genome structure during cell differentiation. Disrupting CTCF

Keywords:
CTCFRNA bindingchromatin loopsembryonic stem cellsgene expressiongenome organizationneural progenitor cells

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Area of Science:

  • Genomics
  • Molecular Biology
  • Cell Biology

Background:

  • CCCTC-binding factor (CTCF) plays a critical role in chromatin organization.
  • CTCF interacts with endogenous RNAs, and its ZF1 RNA-binding region is important for chromatin loop formation in mouse embryonic stem cells (ESCs).
  • The functional significance of CTCF-ZF1 RNA interactions during cell differentiation remains largely unknown.

Purpose of the Study:

  • To investigate the role of CTCF-ZF1 RNA interactions in maintaining cell-type-specific chromatin organization during differentiation.
  • To elucidate the functional consequences of disrupting CTCF-ZF1 RNA interactions on gene regulation and cellular identity.

Main Methods:

  • Utilized an in vitro model of ESC differentiation into neural progenitor cells (NPCs).
  • Generated cells expressing a CTCF mutant lacking the ZF1 RNA-binding region (CTCF-ΔZF1).
  • Identified and characterized NPC-specific RNAs interacting with CTCF-ZF1.
  • Assessed the impact of truncating specific interacting RNAs (Podxl, Grb10) on chromatin loops.

Main Results:

  • CTCF-ZF1 is essential for preserving cell-type-specific chromatin loops during NPC differentiation.
  • Expression of CTCF-ΔZF1 disrupted chromatin loops and dysregulated genes involved in neuronal development.
  • Truncation of NPC-specific RNAs, Podxl and Grb10, mimicked CTCF-ΔZF1 effects by disrupting chromatin loops in cis.

Conclusions:

  • CTCF-ZF1 RNA interactions are fundamentally important for maintaining genome architecture and cellular identity during differentiation.
  • These interactions ensure the proper regulation of cell-type-specific gene expression programs.