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Related Experiment Videos

Transcription occurs at a nucleoskeleton.

D A Jackson, P R Cook

    The EMBO Journal
    |April 1, 1985
    PubMed
    Summary

    Chromatin aggregation under isotonic conditions affects transcription studies. Our novel method reveals transcription occurs on a nuclear substructure, challenging previous interpretations.

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    Simulating topological domains in human chromosomes with a fitting-free model.

    Nucleus (Austin, Tex.)·2016

    Area of Science:

    • Molecular Biology
    • Cell Biology
    • Genetics

    Background:

    • Native chromatin aggregates under isotonic conditions, complicating transcription studies.
    • Previous research yielded conflicting results due to varying salt concentrations (hypotonic vs. hypertonic).
    • The role of nuclear substructures in transcription has been debated.

    Purpose of the Study:

    • To investigate the site of gene transcription using a novel method for preparing chromatin under isotonic conditions.
    • To reconcile contradictory findings regarding chromatin structure and transcription.
    • To propose a model for transcription involving nuclear substructures.

    Main Methods:

    • Developed a novel method for preparing chromatin under isotonic conditions.
    • Examined the association of transcription complex constituents (nascent transcripts, RNA polymerase, genes) with nuclear structures.
    • Compared results from isotonic preparations with hypotonic treatments.

    Main Results:

    • All three constituents of the transcription complex are closely associated with a large nuclear structure under isotonic conditions.
    • This association is partially disrupted by hypotonic treatment.
    • The observed structure is too large to be electroeluted from the nucleus.

    Conclusions:

    • Gene transcription likely involves a nucleoskeleton at the active site.
    • The proposed model reconciles previous contradictory findings on transcription in chromatin.
    • This study provides new insights into the spatial organization of active genes.

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