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Fixed Action Patterns01:06

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A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
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Long-patch Base Excision Repair01:02

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Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
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Restarting Stalled Replication Forks02:37

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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
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Alternative RNA Splicing02:18

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Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
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Actin Filament Depolymerization01:19

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Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
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G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
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Video Experimental Relacionado

Updated: May 5, 2026

Fluorescence Recovery After Photobleaching FRAP of Fluorescence Tagged Proteins in Dendritic Spines of Cultured Hippocampal Neurons
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Las bifurcaciones de replicación desnudas rompen las APRPArt.

Oscar Fernandez-Capetillo1, André Nussenzweig

  • 1Genomic Instability Group, Spanish National Cancer Research Centre (CNIO), Madrid 28029, Spain.

Cell
|November 26, 2013
PubMed
Resumen
Este resumen es generado por máquina.

La ruptura del tenedor de replicación ocurre cuando se agota la proteína de unión al ADN de una sola cadena RPA. Este hallazgo es crucial para comprender los cánceres con alto estrés replicativo.

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Área de la Ciencia:

  • Biología Molecular Biología Molecular
  • Genética La genética.
  • Investigación del cáncer Investigación del cáncer.

Sus antecedentes:

  • La replicación del ADN es esencial para la división celular.
  • Las horquillas de replicación pueden detenerse, lo que lleva a daños en el ADN.
  • El estrés de replicación es un sello distintivo del cáncer.

Objetivo del estudio:

  • Para investigar el mecanismo del colapso de la réplica del tenedor.
  • Para identificar los factores que contribuyen a las rupturas de doble cadena de ADN durante el estrés de replicación.

Principales métodos:

  • El estudio realizado por Toledo et al. (2013) probablemente involucró experimentos para monitorear la estabilidad del tenedor de replicación.
  • Probablemente se emplearon ensayos para medir los niveles de la proteína RPA de unión al ADN de una sola hebra.

Principales resultados:

  • La rotura del tenedor ocurre cuando la piscina de RPA se agota.
  • El agotamiento de RPA conduce a rupturas catastróficas de doble cadena de ADN.

Conclusiones:

  • La disponibilidad de RPA es fundamental para evitar el colapso de la horquilla de replicación.
  • Comprender la dinámica de la RPA ofrece información sobre los orígenes del cáncer y las estrategias de tratamiento para el estrés replicativo.