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Viral Structure00:56

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The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...
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Nucleus softens during herpesvirus infection.

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    Herpes simplex virus type 1 infection softens the cell nucleus by altering its internal structure. This nuclear softening is linked to changes in the nuclear lamina and viral replication compartments.

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    Area of Science:

    • Cell Biology
    • Biophysics
    • Virology

    Background:

    • Nuclear mechanical properties are influenced by both external forces and internal cellular modifications, including viral infections.
    • Herpes simplex virus type 1 (HSV-1) infection reorganizes nuclear structures and affects nuclear functions, but its impact on nuclear mechanobiology remains unclear.

    Purpose of the Study:

    • To investigate how HSV-1 infection alters the mechanical properties of the cell nucleus.
    • To elucidate the underlying mechanisms responsible for infection-induced changes in nuclear stiffness.

    Main Methods:

    • Microscopy techniques were employed to observe nuclear structural changes during HSV-1 infection.
    • Computational modeling was used to simulate and analyze the impact of viral infection on nuclear mechanics and cellular forces.

    Main Results:

    • The cell nucleus exhibits decreased stiffness (softening) during HSV-1 infection.
    • The viral replication compartment has lower biomolecular density than euchromatin. The nuclear lamina shows increased lamin proteins, more outward curvature, and reduced movement.
    • Computational models suggest nuclear softening is caused by the removal of lamina-associated domains or reduced outward forces, potentially increasing nuclear envelope tension.

    Conclusions:

    • HSV-1 infection significantly alters nuclear mechanics, leading to a softer nucleus.
    • Proposed mechanical model explains the coordination between nuclear deformation during infection and reduced nuclear stiffness.