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Una histona H3 lisina 27 desmetilasa regula el desarrollo posterior de los animales
Fei Lan1, Peter E Bayliss, John L Rinn
1Department of Pathology, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, Massachusetts 02115, USA.
Nature
|September 14, 2007
Resumen
Las demetilasas de histona UTX y JMJD3 eliminan la marca H3K27me3, crucial para la regulación génica. Su disfunción afecta la expresión del gen HOX y el desarrollo animal, destacando las funciones conservadas en el desarrollo.
Área de la Ciencia:
- La epigenética es la epigenética.
- Biología del desarrollo Biología del desarrollo.
- Biología Molecular Biología Molecular
Sus antecedentes:
- La dinámica de la metilación de la histona es crítica para la regulación de los genes.
- La trimetilación de la histona H3K27 (H3K27me3) está involucrada en el silenciamiento genético, el patrón de desarrollo y la identidad de las células madre.
- La metilación aberrante de H3K27, vinculada a la sobreexpresión de EZH2, está implicada en los cánceres.
Objetivo del estudio:
- Investigar el papel de las proteínas UTX y JMJD3 que contienen el dominio JmjC en la desmetilación de H3K27me3.
- Explorar la función de UTX en la regulación de la expresión génica HOX y su impacto en el desarrollo animal.
Principales métodos:
- Ensayos bioquímicos para demostrar la actividad de la desmetilasa de UTX y JMJD3 en H3K27me3/2.2.
- Inmunoprecipitación de cromatina para evaluar el enriquecimiento de UTX en los loci del gen HOX.
- Interferencia de ARN en células humanas y knockdown basado en morfolino en peces cebra para estudiar la regulación genética y los defectos del desarrollo.
Principales resultados:
- UTX y JMJD3 fueron identificados como demetilasas H3K27me3/2.
- La localización de UTX se correlaciona con el estado de expresión del gen HOX en los fibroblastos frente a las ESC.
- La inhibición de UTX condujo a un aumento de la regulación errónea del gen H3K27me3 y HOX.
- La inhibición del homólogo de UTX del pez cebra causó defectos en el desarrollo, parcialmente rescatados por UTX humano funcional.
Conclusiones:
- UTX y JMJD3 son demetilasas clave de H3K27 con funciones conservadas en la regulación de la metilación de H3K27.
- Estas enzimas son esenciales para la correcta expresión del gen HOX y el desarrollo anterior-posterior del animal.
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