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La desmetilación de las islas de CpG en células embrionarias
1Department of Cellular Biochemistry, Hewbrew University Medical School, Jerusalem, Israel.
Nature
|May 16, 1991
Resumen
Los patrones de metilación del ADN se restablecen en los primeros embriones. Los transgenes metilados in vitro se someten a desmetilación y metilación de novo, estableciendo patrones correctos para la regulación génica.
Área de la Ciencia:
- La epigenética es la epigenética.
- Biología Molecular Biología Molecular
- Biología del desarrollo Biología del desarrollo.
Sus antecedentes:
- Los patrones de metilación del ADN son generalmente estables en las células somáticas, pero se alteran dinámicamente durante el desarrollo embrionario.
- Estos cambios dinámicos son cruciales para la expresión génica específica del tejido y el desarrollo normal.
- Estudios previos indicaron modificaciones en la metilación del ADN durante la embriogénesis en varios modelos experimentales.
Objetivo del estudio:
- Para investigar el destino de las secuencias de ADN metiladas in vitro en un modelo de ratón.
- Determinar si y cómo los patrones de metilación son reprogramados en las primeras células embrionarias.
- Comprender los mecanismos del establecimiento de la metilación del ADN durante el desarrollo embrionario.
Principales métodos:
- Metilación in vitro de un transgénero de la adenina fosforibosiltransferasa.
- Introducción del transgen metilado en embriones de ratón.
- Análisis de los patrones de metilación del ADN en el transgén utilizando ensayos sensibles a la metilación.
- Experimentos de transfección in vitro utilizando varias secuencias de islas CpG en tipos de células embrionarias.
Principales resultados:
- La región de la isla 5' CpG del transgén fue extensamente desmetilada in vivo.
- El extremo 3' del gen retuvo su metilación y mostró metilación de novo en sitios adicionales.
- La transfección in vitro demostró una rápida desmetilación específica del tipo de célula embrionaria a través de diferentes secuencias de islas de CpG.
- Estos hallazgos indican un restablecimiento programado de la metilación del ADN en los primeros embriones.
Conclusiones:
- Las primeras células embrionarias poseen mecanismos para reconocer y reprogramar los patrones de metilación del ADN.
- Una combinación de desmetilación y metilación de novo está involucrada en el establecimiento de patrones de metilación correctos.
- Este proceso es crucial para imprimir genes con información reguladora apropiada durante el desarrollo.
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