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Papel de las proteínas Tet en la conversión de 5mC a 5hmC, la autorrenovación de las células ES y la especificación
Shinsuke Ito1, Ana C D'Alessio, Olena V Taranova
1Howard Hughes Medical Institute.
Nature
|July 20, 2010
Resumen
Las proteínas Tet catalizan la desmetilación del ADN, convirtiendo la 5-metilcitocina en 5-hidroximetilcitocina. Tet1 es crucial para mantener la identidad de las células madre embrionarias y el desarrollo embrionario adecuado.
Área de la Ciencia:
- La epigenética es la epigenética.
- Biología Molecular Biología Molecular
- Biología del desarrollo Biología del desarrollo.
Sus antecedentes:
- La metilación del ADN es una modificación epigenética clave, pero las enzimas de desmetilación eran en gran medida desconocidas.
- Investigaciones anteriores sugirieron que el TET1 humano podría mediar la desmetilación del ADN.
- La actividad enzimática y las funciones biológicas de las proteínas Tet aún no se habían aclarado completamente.
Objetivo del estudio:
- Para investigar la actividad enzimática de las proteínas Tet de ratón en la desmetilación del ADN.
- Determinar el papel de Tet1 en el mantenimiento y la diferenciación de las células madre embrionarias.
- Explorar la función de Tet1 en el desarrollo embrionario temprano.
Principales métodos:
- Análisis enzimáticos para probar la actividad de la proteína Tet en el ADN.
- Tet1 knockdown experimentos en células madre embrionarias de ratón.
- Análisis de la expresión génica Nanog y la metilación del promotor.
- Estudios de knockdown en embriones de ratón antes de la implantación.
Principales resultados:
- Se demostró que las tres proteínas Tet de ratón (Tet1, Tet2, Tet3) convierten la 5-metilcitocina (5mC) en 5-hidroximetilcitocina (5hmC).
- El derribo de Tet1 en las células madre embrionarias condujo a la regulación a la baja de Nanog y a la hipermetilación del promotor Nanog.
- Tet1 knockdown en embriones pre-implantación dio lugar a un aumento de la diferenciación del trofectodermo.
Conclusiones:
- Las proteínas Tet poseen actividad enzimática desmetiladora del ADN.
- Tet1 juega un papel vital en el mantenimiento de la pluripotencia de las células madre embrionarias de ratón a través de la regulación Nanog.
- Tet1 es esencial para la especificación adecuada del destino celular durante la embriogénesis temprana del ratón.
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