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Videos de Conceptos Relacionados

The Cell Cycle Control System01:28

The Cell Cycle Control System

The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and function at the cell...
The Cell Cycle Control System02:11

The Cell Cycle Control System

The cell cycle is an organized set of events that leads the cell to divide into two daughter cells, each containing chromosomes identical to the parent cell. It is the cell cycle that leads to the formation of an entire organism from a single-cell zygote. Besides, cell division also functions in the renewal or repair of tissues in adult multicellular eukaryotes. For example, in the bone marrow, the stem cells divide to form new blood cells. Although essential for several functions, cell...
The Cell Cycle Control System02:11

The Cell Cycle Control System

The cell cycle is an organized set of events that leads the cell to divide into two daughter cells, each containing chromosomes identical to the parent cell. It is the cell cycle that leads to the formation of an entire organism from a single-cell zygote. Besides, cell division also functions in the renewal or repair of tissues in adult multicellular eukaryotes. For example, in the bone marrow, the stem cells divide to form new blood cells. Although essential for several functions, cell...
Molecular Factors Affecting Cell Division01:27

Molecular Factors Affecting Cell Division

Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...
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To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.
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Positive Regulator Molecules

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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Reconstitution of Cell-cycle Oscillations in Microemulsions of Cell-free Xenopus Egg Extracts
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Modelado del ciclo celular: ¿por qué oscilan ciertos circuitos?

James E Ferrell1, Tony Yu-Chen Tsai, Qiong Yang

  • 1Department of Chemical and Systems Biology, Stanford University School of Medicine, Stanford, CA 94305-5174, USA. james.ferrell@stanford.edu

Cell
|March 19, 2011
PubMed
Resumen
Este resumen es generado por máquina.

El modelado computacional explica el ciclo celular eucariótico como osciladores autónomos. Este estudio detalla los circuitos bioquímicos oscilatorios, centrándose en modelos de ecuaciones diferenciales ordinarias (EDO) y análisis de estabilidad para los ciclos celulares embrionarios de Xenopus.

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Biología de Sistemas Biología de Sistemas.
  • Biología computacional Biología computacional.

Sus antecedentes:

  • El ciclo celular eucariótico, particularmente en los embriones de Xenopus, exhibe un comportamiento oscilante.
  • La comprensión de los mecanismos subyacentes requiere marcos teóricos avanzados más allá de la simple descripción.

Objetivo del estudio:

  • Para presentar la teoría fundamental de los circuitos bioquímicos oscilatorios.
  • Para aclarar los principios que rigen el ciclo celular embrionario de Xenopus utilizando modelos computacionales.

Principales métodos:

  • Examen de modelos booleanos, modelos de ecuaciones diferenciales de retraso y modelos de ecuaciones diferenciales ordinarias (EDO).
  • Análisis de bucles de retroalimentación negativa y circuitos de retroalimentación positiva / negativa acoplados dentro de los modelos ODE.
  • Aplicación del análisis de estabilidad lineal para predecir el comportamiento oscilatorio basado en parámetros cinéticos.

Principales resultados:

  • Demostración de cómo los circuitos de retroalimentación simples pueden generar oscilaciones en los modelos ODE.
  • Identificación de las condiciones necesarias para las oscilaciones sostenidas en los modelos de ciclo celular.
  • Validación de modelos ODE para capturar la dinámica del ciclo celular embrionario de Xenopus.

Conclusiones:

  • El modelado computacional y la teoría de sistemas dinámicos no lineales proporcionan una visión profunda de los mecanismos del ciclo celular.
  • Los circuitos bioquímicos oscilatorios son fundamentales para el funcionamiento autónomo del ciclo celular.
  • El análisis de estabilidad lineal es una herramienta clave para validar y comprender modelos dinámicos de osciladores biológicos.