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La activación de la expresión génica cardíaca por miocardina, un cofactor de transcripción para el factor de
1Department of Molecular Biology, University of Texas Southwestern Medical Center, 6000 Harry Hines Boulevard, Dallas, TX 75390, USA.
Cell
|July 6, 2001
Resumen
Los científicos descubrieron miocardina, un potente factor de transcripción crucial para la regulación de los genes musculares. Myocardin se asocia con el factor de respuesta sérica (SRF) para activar los genes del músculo cardíaco, esenciales para el desarrollo del corazón.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Genética La genética.
- Biología Cardiovascular Biología Cardiovascular
Sus antecedentes:
- El factor de respuesta sérica (SRF, por sus siglas en inglés) es un conocido regulador de los genes inducibles al factor de crecimiento muscular y de los genes inducibles al factor de crecimiento.
- La naturaleza no específica de SRF sugiere la participación de factores accesorios miogénicos para la activación de genes musculares.
Objetivo del estudio:
- Para identificar nuevos genes cardíacos específicos utilizando un enfoque de bioinformática.
- Para caracterizar un factor de transcripción recién descubierto, miocardina, y su papel en la regulación de los genes musculares.
Principales métodos:
- Cribado basado en bioinformática para los genes cardíacos específicos.
- Análisis de expresión en células cardíacas y del músculo liso.
- Estudios funcionales utilizando mutantes dominantes negativos en embriones de Xenopus.
Principales resultados:
- Identificación de miocardina, un potente factor de transcripción expresado en el músculo cardíaco y liso.
- Myocardin se asocia con SRF para activar los promotores del músculo cardíaco.
- La inhibición de la función miocárdica interrumpe la diferenciación celular del miocardio en Xenopus.
Conclusiones:
- Myocardin es un nuevo factor de transcripción muscular que coopera con SRF.
- Myocardin proporciona un mecanismo para que SRF regule los genes específicos del músculo cardíaco.
- Myocardin juega un papel crítico en el desarrollo y la función del miocardio.
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