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Int. J. Mol. Sci. 2012, 13(9), 11569-11583; doi:10.3390/ijms130911569

Is DNA Damage Response Ready for Action Anywhere?

* ,
Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, 08193 Bellaterra (Cerdanyola del Vallès), Spain
* Author to whom correspondence should be addressed.
Received: 31 July 2012 / Revised: 6 September 2012 / Accepted: 7 September 2012 / Published: 14 September 2012
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Organisms are continuously exposed to DNA damaging agents, consequently, cells have developed an intricate system known as the DNA damage response (DDR) in order to detect and repair DNA lesions. This response has to be rapid and accurate in order to keep genome integrity. It has been observed that the condensation state of chromatin hinders a proper DDR. However, the condensation state of chromatin is not the only barrier to DDR. In this review, we have collected data regarding the presence of DDR factors on micronuclear DNA lesions that indicate that micronuclei are almost incapable of generating an effective DDR because of defects in their nuclear envelope. Finally, considering the recent observations about the reincorporation of micronuclei to the main bulk of chromosomes, we suggest that, under certain circumstances, micronuclei carrying DNA damage might be a source of chromosome instability.
Keywords: micronuclei; DSB repair; NER pathway; chromosome instability micronuclei; DSB repair; NER pathway; chromosome instability
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Terradas, M.; Martín, M.; Hernández, L.; Tusell, L.; Genescà, A. Is DNA Damage Response Ready for Action Anywhere? Int. J. Mol. Sci. 2012, 13, 11569-11583.

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