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La desmetilación del ADN mediada por TET controla la gastrulación mediante la regulación de la señalización de

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La inactivación del gen de translocación de diez y once (TET) en ratones causa defectos de desarrollo al interrumpir la metilación y la desmetilación del ADN, lo que afecta la señalización nodal durante la embriogénesis temprana.

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Área de la Ciencia:

  • Epigenética y biología del desarrollo
  • Embriogénesis de los mamíferos
  • Dinámica de la metilación del ADN

Sus antecedentes:

  • Los genomas de los mamíferos presentan modificaciones epigenéticas como la metilación de la citosina por las metiltransferasas del ADN (DNMT).
  • La oxidación de la 5-metilcitosina por las dioxigenasas de translocación TET media la desmetilación.
  • Los roles precisos de la metilación y desmetilación del ADN en la embriogénesis del ratón requieren una mayor aclaración.

Objetivo del estudio:

  • Investigar la importancia funcional de la desmetilación del ADN mediada por TET en la embriogénesis del ratón.
  • Elucidar los mecanismos moleculares que vinculan la dinámica de la metilación del ADN con las vías de señalización embrionarias.

Principales métodos:

  • Generación y análisis de ratones con genes Tet inactivados (mutantes Tet nulos).
  • Evaluación de los fenotipos embrionarios, incluida la gastrulación y el desarrollo del mesodermo.
  • Análisis molecular de la expresión génica y los patrones de metilación de Nodal, Lefty y ADN metiltransferasa (DNMT).

Principales resultados:

  • La inactivación de Tet causó defectos de gastrulación, anomalías de patrón de rayas primitivas y deterioro de la maduración del mesodermo.
  • Estos fenotipos imitaban a los de los embriones con una señalización nodal mejorada, que fue rescatada parcialmente por la mutación nodal.
  • La deficiencia de Tet condujo a una reducción de la expresión del gen Lefty, vinculada a una metilación elevada del ADN; la interrupción de DNMT3A / 3B rescató estos defectos.

Conclusiones:

  • La oxidación mediada por TET de la 5-metilcitosina es crítica para regular la señalización de Lefty-Nodal durante la embriogénesis.
  • La metilación y desmetilación dinámicas del ADN, equilibradas por TET y DNMT, son esenciales para la formación temprana del plan corporal.
  • La alteración de este equilibrio epigenético conduce a anomalías del desarrollo al alterar las vías de señalización clave.