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Related Concept Videos

Duplication of Chromatin Structure02:05

Duplication of 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.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
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Chromatin Immunoprecipitation- ChIP02:36

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Chromatin immunoprecipitation, or ChIP, is an antibody-based technique used to identify sites on DNA that bind to transcription factors of interest or histone proteins. It also helps determine the type of histone modifications such as acetylation, phosphorylation, or methylation.
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Heterochromatin02:38

Heterochromatin

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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
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Spreading of Chromatin Modifications02:25

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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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Retroviruses02:33

Retroviruses

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Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
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Eukaryotic Transcription Inhibitors01:52

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Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
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Related Experiment Video

Updated: Jun 2, 2025

Detection of the Genome and Transcripts of a Persistent DNA Virus in Neuronal Tissues by Fluorescent In situ Hybridization Combined with Immunostaining
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Chromatin mimicry by human JC virus.

Uwe Schaefer, Yekaterina A Miroshnikova, Wei Xie

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    Chronically infecting viruses like JC polyomavirus manipulate nuclear structure. The virus uses Agnoprotein to alter heterochromatin, reducing nuclear stiffness and creating space for replication.

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    Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production
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    Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production

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    Area of Science:

    • Virology
    • Cell Biology
    • Biophysics

    Background:

    • Chronically persistent viruses reside within host cells, often in the nucleus.
    • Nuclear viruses must overcome physical constraints like chromatin to replicate.
    • JC polyomavirus (JCV) is a widespread, potentially lethal human virus.

    Purpose of the Study:

    • To investigate how nuclear viruses manage spatial limitations within the host cell nucleus.
    • To explore the mechanism by which JCV overcomes nuclear architecture constraints.
    • To understand the role of JCV's Agnoprotein in viral replication and nuclear organization.

    Main Methods:

    • Investigated JC polyomavirus infection in human cells.
    • Analyzed the role of viral protein Agnoprotein (Agno) in nuclear heterochromatin.
    • Assessed changes in nuclear stiffness and chromatin organization using biophysical methods.
    • Compared replication of wild-type and mimic-mutant JCV.

    Main Results:

    • JCV interferes with nuclear heterochromatin, creating virus-occupied space.
    • JCV's Agnoprotein mediates heterochromatin disruption via epigenetic mimicry.
    • Viral epigenetic mimicry leads to chromatin reorganization and decreased nuclear stiffness.
    • Mutations in Agno's epigenetic mimics reduce JCV replication.

    Conclusions:

    • JCV actively remodels nuclear architecture to facilitate its lifecycle.
    • Epigenetic mimicry by JCV's Agno is crucial for viral replication.
    • Modulation of nuclear mechanical properties is a potential strategy for nuclear virus chronicity.