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Related Concept Videos

Nucleosome Remodeling02:54

Nucleosome Remodeling

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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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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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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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Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter? 
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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer...
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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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Updated: Jun 17, 2025

A Method to Study de novo Formation of Chromatin Domains
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Reorganizing chromatin by cellular deformation.

Sarthak Gupta1, Maxx Swoger2, Renita Saldanha2

  • 1Physics Department and BioInspired Institute, Syracuse University, Syracuse, NY, USA; Center for Theoretical Biological Physics, Rice University, Houston, TX, USA.

Current Opinion in Cell Biology
|August 9, 2024
PubMed
Summary

Scientists can now edit genomes and observe effects on organism development. This review explores the mechanical forces linking chromatin and cell mechanics to understand how genotype influences phenotype across scales.

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Area of Science:

  • * Molecular Biology and Biophysics
  • * Developmental Biology
  • * Systems Biology

Background:

  • * Genomic editing allows precise manipulation at the nanometer scale.
  • * Observing developmental changes occurs at the centimeter scale.
  • * The multiscale mechanisms connecting these phenomena are not fully understood.

Purpose of the Study:

  • * To review experimental advances in understanding the mechanical interplay between chromatin and cellular scales.
  • * To elucidate the role of mechanical forces in biological structure.
  • * To bridge the gap between genotype and phenotype through multiscale mechanical connections.

Main Methods:

  • * Focus on recent experimental findings.
  • * Analysis of force generation and transmission via the cytoskeleton.
  • * Investigation of chromatin diffusivity and organization influenced by mechanical forces.

Main Results:

  • * Mechanical forces significantly influence nuclear, cellular, and tissue structure.
  • * Cytoskeletal forces impact chromatin dynamics and organization.
  • * Experimental data highlights the multiscale nature of biological regulation.

Conclusions:

  • * Understanding mechanical interplay is crucial for explaining emergent biological phenomena.
  • * Decoding multiscale mechanical connections is key to solving the genotype-to-phenotype puzzle.
  • * This review provides a foundation for future research into mechanical regulation in biology.