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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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Tension Response at Adherens Junctions01:26

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The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
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Cell-matrix's Response to Mechanical Forces01:13

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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
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Mismatch Repair01:20

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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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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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Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force. 
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Related Experiment Video

Updated: Jul 19, 2025

Combining 3D Magnetic Force Actuator and Multi-Functional Fluorescence Imaging to Study Nucleus Mechanobiology
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Combining 3D Magnetic Force Actuator and Multi-Functional Fluorescence Imaging to Study Nucleus Mechanobiology

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Genome maintenance meets mechanobiology.

Vincent Spegg1, Matthias Altmeyer2

  • 1Department of Molecular Mechanisms of Disease, University of Zurich, Zurich, Switzerland.

Chromosoma
|August 15, 2023
PubMed
Summary

Genome stability is crucial for preventing aging and diseases like cancer. This study explores how DNA repair, cell cycle regulation, and chromatin dynamics coordinate to maintain genome integrity, focusing on replication stress and telomere fragility.

Keywords:
Biomolecular condensatesDNA repairGenome stabilityMechanobiologyReplication stressTelomere maintenance

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Area of Science:

  • Cellular Biology
  • Genetics
  • Molecular Biology

Background:

  • Genome stability is essential for cellular health and organismal longevity.
  • Disruptions in genome maintenance are linked to aging and diseases such as cancer and neurodegeneration.
  • Genome surveillance and repair pathways are intricately connected with cell cycle regulation and DNA transactions.

Purpose of the Study:

  • To provide an overview of cell cycle regulation and genome duplication in human cells.
  • To introduce replication stress and cellular responses to perturbed DNA synthesis.
  • To discuss fragile genomic regions, telomere fragility, and DNA repair mechanisms.

Main Methods:

  • Review of cell cycle regulation and genome duplication processes.
  • Introduction to replication stress and cellular responses.
  • Discussion of fragile genomic regions, telomere fragility, and DNA repair, including ALT and APBs.
  • Exploration of compartmentalization in DNA repair and phase separation.
  • Highlighting connections between DNA repair, mechanobiology, and biomolecular condensates.

Main Results:

  • Replication stress can lead to fragility in specific genomic regions, notably telomeres.
  • Alternative Lengthening of Telomeres (ALT) and ALT-associated PML bodies (APBs) serve as models for clustered DNA damage.
  • DNA repair reactions are compartmentalized, with protein properties like phase separation playing a role.
  • Emerging links between DNA repair and mechanobiology are identified.

Conclusions:

  • Coordination of genome maintenance involves dynamic chromatin topology, nuclear repair centers, and cytoskeletal elements.
  • Biomolecular condensates, nuclear cytoskeleton, and organelle interfaces may cooperate in spatial and temporal genome maintenance.
  • Understanding these processes is key to addressing age-associated diseases and cancer.