Video Experimental Relacionado

Updated: Jul 17, 2026

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development

Published on: June 15, 2017

La activación del componente sensor PARP-1 del complejo corepresor groucho / TLE1 media una vía de activación del gen

Bong-Gun Ju¹, Derek Solum, Eun Joo Song

¹Howard Hughes Medical Institute, University of California, San Diego, Department and School of Medicine, La Jolla, CA 92093, USA.

|December 21, 2004

Resumen

La proteína kinasa II delta dependiente de calcio/calmodulina (CaMKIIdelta) induce un cambio en la función HES1. Este interruptor, que involucra a la poli-ADP-ribosa polimerasa 1 (PARP-1), permite la diferenciación neuronal mediante la activación de la expresión génica.

Área de la Ciencia:

Biología Molecular Biología Molecular
Biología del desarrollo Biología del desarrollo.
La neurociencia es la neurociencia.

Sus antecedentes:

La regulación génica es crucial para la diferenciación y el desarrollo celular.
Los factores de transcripción como el HES1 juegan un papel clave en los procesos de desarrollo.
Comprender cómo se enciende y apaga la expresión génica es vital para la biología del desarrollo.

Objetivo del estudio:

Investigar el mecanismo por el cual CaMKIIdelta influye en la función HES1.
Para aclarar el papel de PARP-1 en la regulación genética mediada por HES1.
Comprender las bases moleculares de la activación de genes neurogénicos.

Principales métodos:

Investigó la conmutación funcional de HES1 de supresor a activador.
Se examinó el papel de la inducción de CaMKIIdelta en este proceso.
Se analizó la participación de PARP-1 y el complejo TLE corepressor.

Principales resultados:

La inducción de CaMKIIdelta cambia HES1 de un represor dependiente de TLE a un activador.
La activación de PARP-1 libera el complejo TLE corepressor de los promotores HES1.
La fosforilación mediada por CaMKIIdelta de HES1 es necesaria para la activación del gen neurogénico.

Conclusiones:

Una vía de señalización que involucra a CaMKIIdelta y PARP-1 modula la actividad de HES1 para la diferenciación neuronal.
PARP-1 actúa como un factor de intercambio específico de promotores, facilitando la activación de genes neurogénicos.
Este mecanismo pone de relieve cómo las vías de señalización controlan tanto la desrepresión génica como el reclutamiento de coactivadores.

Más Videos Relacionados

Quantitative PCR-based Assay to Measure Sonic Hedgehog Signaling in Cellular Model of Ciliogenesis

Quantitative PCR-based Assay to Measure Sonic Hedgehog Signaling in Cellular Model of Ciliogenesis

Published on: January 31, 2025

Visualization and Quantitative Analysis of Genotoxin-Induced PARP1/PARP2 Activation in Cells Using a Fluorescent Fusion Protein-Based Reporter

Visualization and Quantitative Analysis of Genotoxin-Induced PARP1/PARP2 Activation in Cells Using a Fluorescent Fusion Protein-Based Reporter

Published on: April 17, 2026

Videos de Conceptos Relacionados

C4 Pathway and CAM

C4 Pathway and CAM

Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
C4 Pathway
The C4 pathway is used by plants such as...

Notch Signaling Pathway

Notch Signaling Pathway

The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...

Activation and Inactivation of G Proteins

Activation and Inactivation of G Proteins

Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high affinity and are together...

GPCRs Regulate Adenylyl Cylase Activity

GPCRs Regulate Adenylyl Cylase Activity

Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of cells.
Two...

cAMP-dependent Protein Kinase Pathways

cAMP-dependent Protein Kinase Pathways

Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...

Notch Signaling Pathway

Notch Signaling Pathway

The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...