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Reorganización genómica masiva adquirida en un solo evento catastrófico durante el desarrollo del cáncer
Philip J Stephens1, Chris D Greenman, Beiyuan Fu
1Wellcome Trust Sanger Institute, Hinxton, Cambridge, UK.
Cell
|January 11, 2011
Resumen
El desarrollo del cáncer implica una crisis genómica repentina llamada cromotripsis, donde numerosas reorganizaciones ocurren a la vez, no gradualmente. Este evento único afecta a múltiples tipos de cáncer e influye en las mutaciones que causan cáncer.
Área de la Ciencia:
- La genómica es la genómica.
- Biología del cáncer Biología del cáncer.
- Dinámica celular La dinámica celular es la dinámica de las células.
Sus antecedentes:
- El cáncer se considera tradicionalmente como el resultado de la acumulación gradual de alteraciones genéticas.
- Las mutaciones somáticas y los reordenamientos cromosómicos son factores clave para el desarrollo del cáncer.
Objetivo del estudio:
- Para caracterizar un fenómeno de reordenamiento genómico masivo que ocurre en un solo evento celular.
- Investigar las implicaciones de este fenómeno para los orígenes y la evolución del cáncer.
Principales métodos:
- Se utilizó la secuenciación de próxima generación para analizar las alteraciones genómicas.
- Se identificaron patrones característicos de reordenamientos cromosómicos indicativos de un solo evento catastrófico.
Principales resultados:
- Identificó y denominó "cromotripsis" un proceso donde decenas a cientos de reordenamientos genómicos ocurren en una sola crisis celular.
- Características distintivas observadas de la cromotripsis, incluidas las rápidas oscilaciones entre dos estados de número de copia.
- Se encontró cromotripsis presente en el 2-3% de todos los cánceres, en particular en el 25% de los cánceres óseos.
- Demostró que las lesiones que conducen al cáncer pueden surgir de esta única crisis genómica.
Conclusiones:
- La cromotripsis representa un mecanismo distinto de inestabilidad genómica en el cáncer, distinto de la acumulación gradual.
- Este fenómeno tiene implicaciones significativas para la comprensión de la rápida aparición de la complejidad genómica y la oncogénesis.
- Los hallazgos sugieren que una única catástrofe celular puede iniciar el desarrollo del cáncer.
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