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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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At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
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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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The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
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Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
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The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
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Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
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Las isoformas traslacionales alternativas de CDC20 ajustan la duración de la detención mitótica

Mary-Jane Tsang1,2, Iain M Cheeseman3,4

  • 1Whitehead Institute for Biomedical Research, Cambridge, MA, USA.

Nature
|April 26, 2023
PubMed
Resumen

Las células equilibran la detención mitótica y el deslizamiento utilizando isoformas de proteínas CDC20. Una isoforma truncada de CDC20 evita el control del punto de control, promoviendo la salida del ciclo celular y afectando la sensibilidad al tratamiento del cáncer.

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Área de la Ciencia:

  • Biología celular
  • Biología molecular
  • Investigación del cáncer

Sus antecedentes:

  • Los errores mitóticos activan el punto de control de ensamblaje del huso (SAC), inhibiendo el CDC20 y causando la detención del ciclo celular.
  • Los errores persistentes pueden conducir al deslizamiento mitótico, donde las células salen de la mitosis a un estado tetraploide, evitando la muerte celular.

Objetivo del estudio:

  • Para dilucidar los mecanismos moleculares que equilibran la detención mitótica y el deslizamiento.
  • Investigar el papel de las isoformas traslacionales CDC20 en la regulación de la duración mitótica.

Principales métodos:

  • Análisis de las isoformas traslacionales CDC20 alternativas conservadas en células humanas.
  • Investigar el impacto de estas isoformas en la inhibición mediada por SAC y la salida mitótica.
  • Modelado del papel de las proporciones de isoforma y la rotación en el control de la duración de la detención mitótica.

Principales resultados:

  • Se han identificado otras isoformas traslacionales CDC20 que modulan la duración de la detención mitótica.
  • Una isoforma truncada de CDC20 es resistente a la inhibición de la SAC, promoviendo la salida mitótica.
  • Los niveles relativos de las isoformas CDC20 actúan como un temporizador para la salida mitótica, siendo clave la isoforma Met43 truncada.

Conclusiones:

  • El equilibrio entre la detención mitótica y el deslizamiento está controlado por las relaciones de isoforma traslacional CDC20.
  • Las alteraciones en los niveles de la isoforma CDC20 o su control traslacional afectan la sensibilidad a los fármacos antimitoticos.
  • Los hallazgos tienen implicaciones para el diagnóstico del cáncer y las estrategias terapéuticas.