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Related Concept Videos

Chromatin Position Affects Gene Expression02:35

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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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How does a complex organism such as a human develop from a single cell? It all starts from a single fertilized egg which gives rise to a vast array of cell types, such as nerve cells, muscle cells, and epithelial cells that characterize the adult? Throughout development and adulthood, cellular differentiation leads cells to assume their final morphology and physiology. Differentiation is the process by which unspecialized cells become specialized to carry out distinct functions.
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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Related Experiment Video

Updated: Mar 1, 2026

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Coupling between chromosome intermingling and gene regulation during cellular differentiation.

Yejun Wang1, Nikhil Jain1, Mallika Nagarajan1

  • 1Mechanobiology Institute and Department of Biological Sciences, National University of Singapore, 117411 Singapore, Singapore.

Methods (San Diego, Calif.)
|May 31, 2017
PubMed
Summary

Stem cell differentiation involves changes in nuclear biophysical properties like stiffness and chromatin compaction, influencing gene expression. Understanding these nuclear architecture dynamics is key to cell fate determination.

Keywords:
Cell differentiationChromosome interminglingFluorescence anisotropy imagingGenome regulationSuper-resolution fluorescence microscopy

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Area of Science:

  • Cell Biology
  • Biophysics
  • Genomics

Background:

  • Stem cell differentiation involves significant changes in cellular and nuclear architecture.
  • Nuclear biophysical properties, including stiffness and chromatin organization, are altered during differentiation.
  • These changes correlate with dynamic alterations in gene expression profiles.

Purpose of the Study:

  • To summarize current findings on the emergence of nuclear biophysical properties during stem cell differentiation.
  • To link stem cell differentiation with alterations in nuclear architecture, chromatin compaction, and dynamics.
  • To highlight advanced methods for characterizing chromosome organization and contacts.

Main Methods:

  • Review of current biophysical and molecular approaches.
  • Analysis of advanced imaging methods.
  • Integration of computational developments for characterizing chromosome organization.

Main Results:

  • Emergence of nuclear stiffness, chromatin compaction, and chromosome positioning during differentiation.
  • Correlation between altered nuclear architecture and gene expression profiles.
  • Characterization of transcription-related chromosome organization, including intermingling and nano-scale contacts.

Conclusions:

  • Nuclear biophysical properties play a crucial role in regulating gene expression during stem cell differentiation.
  • Advanced techniques are essential for understanding complex chromosome organization.
  • A functional roadmap for cell-type-specific chromosome positioning is emerging.