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    Area of Science:

    • Cell Biology
    • Molecular Biology
    • Genetics

    Background:

    • The nucleolus is a key nuclear organelle responsible for ribosome biogenesis.
    • The precise mechanisms linking ribosomal RNA (rRNA) processing to nucleolar architecture are not fully understood.
    • Specific steps like endonucleolytic cleavages in rRNA maturation are crucial but their role in maintaining nucleolar organization requires further investigation.

    Purpose of the Study:

    • To investigate the impact of impaired pre-ribosomal RNA (pre-rRNA) processing, specifically 5' external transcribed spacer (5'ETS) cleavage, on nucleolar organization.
    • To explore the consequences of disrupted nucleolar architecture on nuclear organization and gene regulation.

    Main Methods:

    • Disruption of pre-rRNA processing, focusing on 5'ETS cleavage.
    • Analysis of nucleolar structure using DAPI staining.
    • Assessment of nascent RNA localization.
    • Proteomic analysis of aberrant nucleoli.
    • Examination of heterochromatin marker localization.

    Main Results:

    • Defects in 5'ETS processing lead to profound alterations in nucleolar organization, forming a single large DAPI-negative nuclear structure.
    • Nascent RNA becomes mislocalized and diffuses throughout the disorganized nucleolus.
    • Aberrant nucleoli show altered proteomic profiles, with downregulation of splicing, cell cycle, and chromatin organization factors.
    • Mislocalization of heterochromatin markers indicates broader disruptions in nuclear architecture and gene regulation.

    Conclusions:

    • Proper 5' external transcribed spacer (5'ETS) cleavage is essential for maintaining nucleolar compartmentalization.
    • Ribosomal RNA processing is tightly coupled with overall nuclear organization and gene regulation.
    • Nucleolar disorganization has far-reaching consequences beyond ribosome biogenesis, impacting multiple nuclear functions.