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Modelado de las lesiones epigenéticas que causan gliomas

Gilbert J Rahme¹, Nauman M Javed¹, Kaitlyn L Puorro²

¹Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; Departments of Cell Biology and Pathology, Harvard Medical School, Boston, MA 02215, USA; Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA.

|July 26, 2023

Resumen

La interrupción de un aislante CTCF cerca de PDGFRA en las células de ratón aumenta la proliferación. Combinado con la pérdida del supresor tumoral Cdkn2a, esto impulsa la formación de gliomas, ofreciendo información sobre los impulsores del cáncer.

Área de la Ciencia:

Biología del cáncer
La epigenética
La genómica

Sus antecedentes:

Las alteraciones epigenéticas que interrumpen los elementos reguladores son conductores potenciales del cáncer.
Se necesitan modelos experimentales para validar el impacto tumorigénico de estas lesiones.
Los gliomas mutantes de isocitrato deshidrogenasa muestran hipermetilación del ADN, lo que sugiere factores epigenéticos.

Objetivo del estudio:

Para modelar las aberraciones epigenéticas en gliomas mutantes de isocitrato deshidrogenasa.
Para investigar el papel de una interrupción del aislante CTCF cerca de PDGFRA en la gliogénesis.
Para entender la cooperación entre la interrupción del aislante y el silenciamiento del gen supresor del tumor.

Principales métodos:

Modelado de la ruptura del aislador CTCF en las células progenitoras de los oligodendrocitos de ratón (OPC).
Análisis de la activación del oncogén PDGFRA por un potenciador específico de OPC.
Evaluación del silenciamiento del supresor tumoral Cdkn2a y su cooperación con la pérdida de aislantes.
Estudios de gliogénesis in vivo.

Principales resultados:

La interrupción del aislante CTCF en los OPC del ratón condujo a la activación del PDGFRA y al aumento de la proliferación.
El silenciamiento dependiente de la metilación de Cdkn2a cooperó con la pérdida de aislantes.
La inactivación coordinada del aislador PDGFRA y Cdkn2a condujo a la gliomagénesis in vivo.
La riqueza específica de CpG en el aislante complica el modelado de ratones, pero sugiere un papel en el riesgo de glioma humano.

Conclusiones:

Las lesiones epigenéticas recurrentes pueden impulsar la proliferación de células progenitoras de oligodendrocitos in vitro.
Las alteraciones epigenéticas coordinadas, incluida la interrupción del aislante y el silenciamiento del supresor tumoral, impulsan la gliogénesis in vivo.
El estudio destaca el potencial de las lesiones epigenéticas como impulsores del cáncer y los desafíos en el modelado de las características epigenéticas específicas del ser humano.

Palabras clave:

En el caso del CDKN2A:Metilación del ADN La mutación de IDH En el caso de las PYME:célula de origen Cromatina y sus derivados Topología del genoma el glioma Arquitectura nuclear Células progenitoras de oligodendrocitos

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