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Mediator kinase module and human tumorigenesis.

Alison D Clark1, Marieke Oldenbroek1, Thomas G Boyer1

  • 1a Department of Molecular Medicine , Institute of Biotechnology, University of Texas Health Science Center at San Antonio , San Antonio , TX , USA.

Critical Reviews in Biochemistry and Molecular Biology
|July 17, 2015
PubMed
Summary

The Mediator kinase module, including CDK8, processes signals for gene regulation. Alterations in its subunits can drive tumor formation by disrupting signaling pathways, suggesting new therapeutic targets.

Keywords:
CancerMediatorRNA polymerase II transcriptiondevelopmentsignal transduction

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Area of Science:

  • Molecular Biology
  • Cellular Signaling
  • Cancer Biology

Background:

  • The Mediator complex is crucial for gene transcription, acting as a signal processor.
  • The human Mediator complex includes a four-subunit kinase module (MED13, MED12, CDK8, Cyclin C) associated with the core complex.
  • The kinase module is a key entry point for developmental and oncogenic signals, with CDK8 kinase activity being central to its function.

Purpose of the Study:

  • To review the structural organization, biological function, and oncogenic potential of the Mediator kinase module.
  • To focus on tumor-associated alterations in kinase module subunits with established mechanistic links to cancer.
  • To highlight the Mediator kinase module as an oncogenic unit driven by component alterations.

Main Methods:

  • Review of existing genetic and biochemical studies.
  • Analysis of structural and biochemical data on subunit interactions.
  • Focus on mechanistic relationships between subunit alterations and tumor formation.

Main Results:

  • CDK8 kinase activity impacts transcription factor stability, Pol II activity, and chromatin.
  • Pathologic changes in kinase module subunits lead to altered signaling and tumor development.
  • Established mechanistic links between specific subunit alterations and oncogenesis.

Conclusions:

  • The Mediator kinase module functions as an oncogenic unit when its components are pathologically altered.
  • Perturbation of signal-dependent gene regulation by the kinase module drives tumor formation.
  • Targeting CDK8 activity or related pathways offers potential therapeutic strategies for CDK8-driven tumors.