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La pérdida transitoria de los componentes de Polycomb induce un destino de cáncer epigenético
V Parreno1, V Loubiere1,2, B Schuettengruber1
1Institute of Human Genetics, CNRS, University of Montpellier, Montpellier, France.
Nature
|April 24, 2024
Resumen
La alteración transitoria del silenciamiento epigenético por las proteínas del grupo Polycomb puede iniciar el cáncer en las moscas de la fruta sin mutaciones genéticas. Esta desregulación epigenética conduce a un cambio irreversible al destino de una célula cancerosa, destacando los impulsores no genéticos de la tumorigénesis.
Área de la Ciencia:
- Biología del cáncer
- La epigenética
- Biología del desarrollo
Sus antecedentes:
- El cáncer a menudo está relacionado con mutaciones somáticas, pero las alteraciones epigenómicas también juegan un papel en la tumorigénesis.
- La suficiencia de mecanismos puramente no genéticos en el inicio del cáncer, independientemente de las mutaciones, sigue siendo en gran medida inexplorada.
Objetivo del estudio:
- Investigar si la desregulación epigenética por sí sola puede iniciar el cáncer.
- Para determinar si los factores no genéticos son suficientes para la transformación maligna.
Principales métodos:
- Utilizado Drosophila como un organismo modelo para estudiar el inicio del cáncer.
- Silencio transcripcional perturbado mediado por las proteínas del grupo Polycomb.
- Cambios de expresión génica analizados, centrados en la vía JAK-STAT y zfh1.
Principales resultados:
- Una interrupción transitoria del silenciamiento transcripcional mediado por Polycomb indujo un cambio irreversible al destino de las células cancerosas.
- Este interruptor estaba relacionado con la desrepresión de los genes que impulsan el cáncer, incluidos los componentes de la vía JAK-STAT y zfh1.
- La activación aberrante de zfh1 fue esencial para la tumorigénesis inducida por la perturbación de Polycomb.
Conclusiones:
- La desregulación epigenética, específicamente el agotamiento reversible de las proteínas Polycomb, puede iniciar el cáncer en ausencia de mutaciones conductoras.
- Los tumores pueden surgir de alteraciones epigenéticas que conducen a la herencia de destinos celulares alterados.
- Este estudio demuestra que los mecanismos no genéticos son suficientes para impulsar la transformación maligna.
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