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M-Cdk Drives Transition Into Mitosis02:15

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Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
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The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
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Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
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Forward Genetic Approach to Uncover Stress Resistance Genes in Mice — A High-throughput Screen in ES Cells
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[CDK8/19 in Stress Response in Mouse Embryonic Fibroblast Model].

E A Varlamova1,2,3, T A Kirukhina1, A K Isagulieva1,4

  • 1Institute of Gene Biology, Russian Academy of Sciences, Moscow, 119334 Russia.

Molekuliarnaia Biologiia
|August 27, 2025
PubMed
Summary
This summary is machine-generated.

Cyclin-dependent kinases 8 and 19 (CDK8/19) regulate essential cellular processes. New mouse models reveal CDK8/19

Keywords:
Cre-ER^(T2)Mediator complexcell cyclecyclin-dependent kinases 8 and 19inducible gene knockoutmouse embryonic fibroblastsradiotherapyserum response

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Context:

  • Cyclin-dependent kinases 8 and 19 (CDK8/19) are transcriptional regulators within the Mediator complex.
  • Previous research on CDK8/19 functions relied heavily on tumor cell lines, potentially yielding irrelevant results.
  • Unique functions of CDK8 and its paralog CDK19 have remained largely unelucidated.

Purpose:

  • To investigate the combined roles of CDK8 and CDK19 in a whole organism and primary cell cultures.
  • To engineer a novel mouse model (Cdk8^(fl/fl)/Cdk19^(-/-)/Rosa26/Cre/ERT2) for inducible CDK8 knockout and constitutive CDK19 knockout.
  • To analyze the effects of CDK8/19 inhibition and knockout in mouse embryonic fibroblasts (MEFs).

Summary:

  • CDK8/19 inhibition induced significant cell death in MEFs, while knockout reduced proliferation rates.
  • RNA sequencing identified alterations in Wnt signaling, cytokine response, and osteoclast differentiation pathways.
  • Novel roles in cytoskeleton regulation, differentiation, cell adhesion, extracellular matrix formation, and mitochondrial biogenesis were uncovered.
  • CDK8/19 mediate stress responses to DNA damage and serum stimulation, which were impaired in knockout MEFs.

Impact:

  • This study provides the first comprehensive analysis of CDK8/19 functions in a physiological context using a novel mouse model.
  • Findings challenge previous assumptions based on tumor cell line data and highlight the critical roles of CDK8/19 in fundamental cellular processes.
  • The results offer new insights into the regulation of Wnt signaling, differentiation, and stress responses, with potential implications for understanding development and disease.