TDP2-dependent non-homologous end-joining protects against topoisomerase II-induced DNA breaks and genome instability in cells and in vivo.

Anticancer topoisomerase "poisons" exploit the break-and-rejoining mechanism of topoisomerase II (TOP2) to generate TOP2-linked DNA double-strand breaks (DSBs). This characteristic underlies the clinical efficacy of TOP2 poisons, but is also implicated in chromosomal translocations and gen...

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Autores principales: Fernando Gómez-Herreros, Rocío Romero-Granados, Zhihong Zeng, Alejandro Alvarez-Quilón, Cristina Quintero, Limei Ju, Lieve Umans, Liesbeth Vermeire, Danny Huylebroeck, Keith W Caldecott, Felipe Cortés-Ledesma
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Publicado: Public Library of Science (PLoS) 2013
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Acceso en línea:https://doaj.org/article/b6ee006f88034a179df6e3efdebf08fa
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spelling oai:doaj.org-article:b6ee006f88034a179df6e3efdebf08fa2021-11-18T06:19:59ZTDP2-dependent non-homologous end-joining protects against topoisomerase II-induced DNA breaks and genome instability in cells and in vivo.1553-73901553-740410.1371/journal.pgen.1003226https://doaj.org/article/b6ee006f88034a179df6e3efdebf08fa2013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23505375/?tool=EBIhttps://doaj.org/toc/1553-7390https://doaj.org/toc/1553-7404Anticancer topoisomerase "poisons" exploit the break-and-rejoining mechanism of topoisomerase II (TOP2) to generate TOP2-linked DNA double-strand breaks (DSBs). This characteristic underlies the clinical efficacy of TOP2 poisons, but is also implicated in chromosomal translocations and genome instability associated with secondary, treatment-related, haematological malignancy. Despite this relevance for cancer therapy, the mechanistic aspects governing repair of TOP2-induced DSBs and the physiological consequences that absent or aberrant repair can have are still poorly understood. To address these deficits, we employed cells and mice lacking tyrosyl DNA phosphodiesterase 2 (TDP2), an enzyme that hydrolyses 5'-phosphotyrosyl bonds at TOP2-associated DSBs, and studied their response to TOP2 poisons. Our results demonstrate that TDP2 functions in non-homologous end-joining (NHEJ) and liberates DSB termini that are competent for ligation. Moreover, we show that the absence of TDP2 in cells impairs not only the capacity to repair TOP2-induced DSBs but also the accuracy of the process, thus compromising genome integrity. Most importantly, we find this TDP2-dependent NHEJ mechanism to be physiologically relevant, as Tdp2-deleted mice are sensitive to TOP2-induced damage, displaying marked lymphoid toxicity, severe intestinal damage, and increased genome instability in the bone marrow. Collectively, our data reveal TDP2-mediated error-free NHEJ as an efficient and accurate mechanism to repair TOP2-induced DSBs. Given the widespread use of TOP2 poisons in cancer chemotherapy, this raises the possibility of TDP2 being an important etiological factor in the response of tumours to this type of agent and in the development of treatment-related malignancy.Fernando Gómez-HerrerosRocío Romero-GranadosZhihong ZengAlejandro Alvarez-QuilónCristina QuinteroLimei JuLieve UmansLiesbeth VermeireDanny HuylebroeckKeith W CaldecottFelipe Cortés-LedesmaPublic Library of Science (PLoS)articleGeneticsQH426-470ENPLoS Genetics, Vol 9, Iss 3, p e1003226 (2013)
institution DOAJ
collection DOAJ
language EN
topic Genetics
QH426-470
spellingShingle Genetics
QH426-470
Fernando Gómez-Herreros
Rocío Romero-Granados
Zhihong Zeng
Alejandro Alvarez-Quilón
Cristina Quintero
Limei Ju
Lieve Umans
Liesbeth Vermeire
Danny Huylebroeck
Keith W Caldecott
Felipe Cortés-Ledesma
TDP2-dependent non-homologous end-joining protects against topoisomerase II-induced DNA breaks and genome instability in cells and in vivo.
description Anticancer topoisomerase "poisons" exploit the break-and-rejoining mechanism of topoisomerase II (TOP2) to generate TOP2-linked DNA double-strand breaks (DSBs). This characteristic underlies the clinical efficacy of TOP2 poisons, but is also implicated in chromosomal translocations and genome instability associated with secondary, treatment-related, haematological malignancy. Despite this relevance for cancer therapy, the mechanistic aspects governing repair of TOP2-induced DSBs and the physiological consequences that absent or aberrant repair can have are still poorly understood. To address these deficits, we employed cells and mice lacking tyrosyl DNA phosphodiesterase 2 (TDP2), an enzyme that hydrolyses 5'-phosphotyrosyl bonds at TOP2-associated DSBs, and studied their response to TOP2 poisons. Our results demonstrate that TDP2 functions in non-homologous end-joining (NHEJ) and liberates DSB termini that are competent for ligation. Moreover, we show that the absence of TDP2 in cells impairs not only the capacity to repair TOP2-induced DSBs but also the accuracy of the process, thus compromising genome integrity. Most importantly, we find this TDP2-dependent NHEJ mechanism to be physiologically relevant, as Tdp2-deleted mice are sensitive to TOP2-induced damage, displaying marked lymphoid toxicity, severe intestinal damage, and increased genome instability in the bone marrow. Collectively, our data reveal TDP2-mediated error-free NHEJ as an efficient and accurate mechanism to repair TOP2-induced DSBs. Given the widespread use of TOP2 poisons in cancer chemotherapy, this raises the possibility of TDP2 being an important etiological factor in the response of tumours to this type of agent and in the development of treatment-related malignancy.
format article
author Fernando Gómez-Herreros
Rocío Romero-Granados
Zhihong Zeng
Alejandro Alvarez-Quilón
Cristina Quintero
Limei Ju
Lieve Umans
Liesbeth Vermeire
Danny Huylebroeck
Keith W Caldecott
Felipe Cortés-Ledesma
author_facet Fernando Gómez-Herreros
Rocío Romero-Granados
Zhihong Zeng
Alejandro Alvarez-Quilón
Cristina Quintero
Limei Ju
Lieve Umans
Liesbeth Vermeire
Danny Huylebroeck
Keith W Caldecott
Felipe Cortés-Ledesma
author_sort Fernando Gómez-Herreros
title TDP2-dependent non-homologous end-joining protects against topoisomerase II-induced DNA breaks and genome instability in cells and in vivo.
title_short TDP2-dependent non-homologous end-joining protects against topoisomerase II-induced DNA breaks and genome instability in cells and in vivo.
title_full TDP2-dependent non-homologous end-joining protects against topoisomerase II-induced DNA breaks and genome instability in cells and in vivo.
title_fullStr TDP2-dependent non-homologous end-joining protects against topoisomerase II-induced DNA breaks and genome instability in cells and in vivo.
title_full_unstemmed TDP2-dependent non-homologous end-joining protects against topoisomerase II-induced DNA breaks and genome instability in cells and in vivo.
title_sort tdp2-dependent non-homologous end-joining protects against topoisomerase ii-induced dna breaks and genome instability in cells and in vivo.
publisher Public Library of Science (PLoS)
publishDate 2013
url https://doaj.org/article/b6ee006f88034a179df6e3efdebf08fa
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