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Cromotripsis por daño en el ADN en los micronúcleos

Cheng-Zhong Zhang¹, Alexander Spektor², Hauke Cornils³

¹1] Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02215, USA [2] Department of Pediatric Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02215, USA [3] Broad Institute of Harvard and MIT, Cambridge, Massachusetts 02142, USA [4] Department of Cell Biology, Harvard Medical School, Boston, Massachusetts 02115, USA.

|May 29, 2015

Resumen

La cromotripsis, un fenómeno de reordenamiento genómico en el cáncer, puede ser causada por cromosomas aislados en micronúcleos. Este estudio demuestra que la formación de micronúcleos conduce a eventos similares a la cromotripsis dentro de una sola división celular.

Área de la Ciencia:

La genómica es la genómica.
Biología celular Biología celular.
Investigación del cáncer Investigación del cáncer.

Sus antecedentes:

La cromotripsis es un fenómeno mutacional caracterizado por extensos reordenamientos genómicos en cromosomas limitados.
El mecanismo subyacente de la cromotripsis sigue siendo en gran medida desconocido.
Una hipótesis previa sugirió que la cromotripsis puede surgir de cromosomas aislados dentro de micronúcleos.

Objetivo del estudio:

Investigar el papel de los micronúcleos en la generación de reordenamientos genómicos.
Para determinar si la formación de micronúcleos puede recapitular la cromotripsis.
Para aclarar el mecanismo de la cromotripsis.

Principales métodos:

Imágenes de células vivas tomadas con células vivas.
Secuenciación del genoma de una sola célula.
Inducción de la formación de micronúcleos.

Principales resultados:

La formación de micronúcleos puede generar un espectro de reordenamientos genómicos.
Estas reorganizaciones, incluidas las características de cromotripsis, están restringidas a los cromosomas mal segregados.
Los eventos similares a la cromotripsis pueden ocurrir dentro de una sola división celular a través de la fragmentación y el reensamblaje dentro de los micronúcleos.

Conclusiones:

La formación de micronúcleos es un mecanismo viable para generar cromotripsis.
Este estudio establece un nuevo proceso mutacional con cromotripsis como resultado extremo.

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