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Mitral Valve Prolapse III: Nursing Management
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Los complejos LSD1 opuestos funcionan en los programas de activación y represión de genes en el desarrollo.

Jianxun Wang1, Kathleen Scully, Xiaoyan Zhu

  • 1Howard Hughes Medical Institute, Department and School of Medicine, University of California, San Diego, 9500 Gilman Drive, Room 345, La Jolla, California 92093-0648, USA.

Nature
|March 30, 2007
PubMed
Resumen
Este resumen es generado por máquina.

La histona demetilasa LSD1 orquesta la activación y represión de genes durante el desarrollo de la hipófisis. Sus complejos, influenciados por ZEB1, regulan la diferenciación celular y los patrones de expresión génica temporal en los órganos.

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Área de la Ciencia:

  • Epigenética y biología del desarrollo.
  • Mecanismos moleculares de la regulación génica.

Sus antecedentes:

  • El control de la transcripción en el desarrollo de metazoos se basa en complejos correguladores y modificaciones epigenéticas.
  • Los roles precisos in vivo de las histonas metiltransferasas y demetilasas en la orquestación de distintos programas de genes en el desarrollo siguen sin estar claros.

Objetivo del estudio:

  • Para investigar el papel de la histona lisina desmetilasa LSD1 en la organogénesis pituitaria.
  • Para dilucidar cómo LSD1 modula la activación de genes y programas de represión durante la determinación y diferenciación del linaje celular tardía.

Principales métodos:

  • Estudió la función de LSD1, un componente del complejo co-represor CoREST-CtBP.
  • Investigó el reclutamiento de LSD1 de distintos complejos coactivadores o co-represores.
  • Examinó el impacto de la expresión de ZEB1 en la represión génica dependiente de LSD1.

Principales resultados:

  • LSD1 es esencial para la determinación tardía del linaje celular y la diferenciación en la glándula pituitaria.
  • LSD1 regula tanto la activación génica como los programas de represión a través de distintas formaciones complejas.
  • La expresión inducida de ZEB1 en el desarrollo tardío recluta complejos que contienen LSD1 para reprimir genes adicionales, incluido Gh.

Conclusiones:

  • Los patrones de expresión temporal de los componentes del complejo LSD1 modulan los programas reguladores de genes durante el desarrollo de los órganos de los mamíferos.
  • LSD1 juega un papel dinámico en la organogénesis pituitaria, cambiando entre las funciones de activación y represión.
  • ZEB1 actúa como un regulador clave en la extensión de la represión génica mediada por LSD1 durante etapas posteriores del desarrollo.