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Updated: Jun 26, 2025

Induction and Diagnosis of Tumors in Drosophila Imaginal Disc Epithelia
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Distinct effects of CDK8 module subunits on cellular growth and proliferation in Drosophila

Xiao Li, Mengmeng Liu, Yue Xing

    Biorxiv : the Preprint Server for Biology
    |May 15, 2024
    PubMed

    Insights

    The CDK8 kinase module (CKM) subunits have distinct roles in transcription. Med12-Med13 impacts ribosome biogenesis and growth more than CDK8-CycC, which affects cell-cycle progression.

    Area of Science:

    • Molecular Biology
    • Cell Biology

    Background:

    • The Mediator complex is crucial for RNA polymerase II transcription.
    • The CDK8 kinase module (CKM), a subcomplex of Mediator, comprises CDK8, CycC, Med12, and Med13.
    • Distinct phenotypes from CKM subunit mutations suggest non-redundant functions.

    Approach:

    • Utilized *Drosophila* as a model organism to investigate CKM subunit functions.
    • Performed gene depletion experiments to assess the impact of specific CKM subunits.
    • Analyzed effects on E2F1 target gene expression, cell-cycle progression, ribosomal protein genes, and fibrillarin.

    Key Points:

    • Depletion of CDK8-CycC enhances E2F1 target gene expression and cell-cycle progression.
    • Depletion of Med12-Med13 impairs ribosomal protein gene expression and fibrillarin, reducing ribosome biogenesis and cellular growth.
    • Med12 and Med13 stabilize CDK8 and CycC, with a mutual dependence between Med12 and Med13; CycC stability also requires other CKM subunits.

    Conclusions:

    • CKM subunits exhibit distinct *in vivo* roles.
    • Med12-Med13 disruption has a more significant impact on ribosome biogenesis and cellular growth than CDK8-CycC loss.
    • Findings clarify the differential consequences of CKM mutations in cellular processes.

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