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La inactivación mutacional de STAG2 causa aneuploidía en el cáncer humano
David A Solomon1, Taeyeon Kim, Laura A Diaz-Martinez
1Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University School of Medicine, Washington, DC 20057, USA.
Science (New York, N.Y.)
|August 20, 2011
Resumen
Las células cancerosas a menudo tienen números cromosómicos anormales (aneuploidía). Los investigadores descubrieron que las mutaciones en el gen STAG2 interrumpen la separación cromosómica, causando aneuploidía en varios tumores humanos.
Área de la Ciencia:
- La genómica es la genómica.
- Biología del cáncer Biología del cáncer.
- División celular La división celular es la división celular.
Sus antecedentes:
- La aneuploidía, un recuento anormal de cromosomas, es un sello distintivo de la mayoría de los cánceres humanos.
- El complejo de cohesina es crucial para la separación precisa de las cromatidas hermanas durante la división celular.
Objetivo del estudio:
- Para investigar los orígenes mecanicistas de la aneuploidía en tumores humanos.
- Determinar el papel de las mutaciones del gen STAG2 en el desarrollo de la aneuploidía.
Principales métodos:
- Análisis genómicos integrados de diversos tipos de tumores humanos.
- La inactivación dirigida del gen STAG2 en una línea celular humana.
- Corrección dirigida de las mutaciones STAG2 en líneas celulares de glioblastoma.
Principales resultados:
- Se identificaron deleciones o mutaciones inactivadoras de STAG2 en varios tipos de tumores.
- La inactivación de STAG2 en una línea celular normal indujo defectos de cohesión cromática y aneuploidía.
- La corrección de las mutaciones STAG2 en las células cancerosas mejora la estabilidad cromosómica.
Conclusiones:
- La alteración genética de la subunidad de cohesión STAG2 es una causa directa de la aneuploidía en el cáncer humano.
- STAG2, ubicado en el cromosoma X, es susceptible a la inactivación, lo que contribuye al desarrollo del cáncer.
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