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Maimouna M, Sofian B, Latifatou G, Joséphine Frédérique Mendouga E, Papa Macoumba G, Mamadou Moustapha D, Dirk VG. Unresectable and chemoresistant conjunctival squamous cell carcinoma on xeroderma pigmentosum treated by salvage radiation therapy: A case report and a review of the literature. Clin Case Rep 2022; 10:e6360. [PMID: 36188050 PMCID: PMC9508803 DOI: 10.1002/ccr3.6360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 04/11/2022] [Accepted: 08/31/2022] [Indexed: 11/22/2022] Open
Abstract
Xeroderma pigmentosum (XP) is a rare genetic disease, which vital prognosis is conditioned by the occurrence of cancers essentially of the skin and ocular surfaces, requiring an early and adapted management. Radiation therapy (RT) is a very effective modality in the therapeutic arsenal alongside surgery, but it remains underused as it is wrongly considered to be deleterious for these patients. In this article, we report the case of a 10-years-old girl with XP treated with external beam RT for a squamous cell carcinoma (SCC) of the right ocular conjunctiva. The clinical tolerance was excellent and we obtained a good tumoral response. Therefore, the place of RT in these patients could/should be reconsidered, especially since these suspicions have still not been confirmed.
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Affiliation(s)
- Mané Maimouna
- Department of Radiation‐OncologyDalal Jamm National University HospitalDakarSenegal
| | - Benkhaled Sofian
- Institut Jules‐Bordet, Department of Radiation OncologyUniversité Libre de BruxellesBrusselsBelgium
| | - Guèye Latifatou
- Department of Radiation‐OncologyDalal Jamm National University HospitalDakarSenegal
| | | | - Gaye Papa Macoumba
- Department of Radiation‐OncologyDalal Jamm National University HospitalDakarSenegal
| | | | - Van Gestel Dirk
- Institut Jules‐Bordet, Department of Radiation OncologyUniversité Libre de BruxellesBrusselsBelgium
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Ma X, Wang C, Zhou B, Cheng Z, Mao Z, Tang TS, Guo C. DNA polymerase η promotes nonhomologous end joining upon etoposide exposure dependent on the scaffolding protein Kap1. J Biol Chem 2022; 298:101861. [PMID: 35339488 PMCID: PMC9046958 DOI: 10.1016/j.jbc.2022.101861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 03/16/2022] [Accepted: 03/17/2022] [Indexed: 11/25/2022] Open
Abstract
DNA polymerase eta (Pol η) is a eukaryotic member of the Y-family of DNA polymerase involved in translesion DNA synthesis and genome mutagenesis. Recently, several translesion DNA synthesis polymerases have been found to function in repair of DNA double-strand breaks (DSBs). However, the role of Pol η in promoting DSB repair remains to be well defined. Here, we demonstrated that Pol η could be targeted to etoposide (ETO)-induced DSBs and that depletion of Pol η in cells causes increased sensitivity to ETO. Intriguingly, depletion of Pol η also led to a nonhomologous end joining repair defect in a catalytic activity–independent manner. We further identified the scaffold protein Kap1 as a novel interacting partner of Pol η, the depletion of which resulted in impaired formation of Pol η and Rad18 foci after ETO treatment. Additionally, overexpression of Kap1 failed to restore Pol η focus formation in Rad18-deficient cells after ETO treatment. Interestingly, we also found that Kap1 bound to Rad18 in a Pol η-dependent manner, and moreover, depletion of Kap1 led to a significant reduction in Rad18–Pol η association, indicating that Kap1 forms a ternary complex with Rad18 and Pol η to stabilize Rad18–Pol η association. Our findings demonstrate that Kap1 could regulate the role of Pol η in ETO-induced DSB repair via facilitating Rad18 recruitment and stabilizing Rad18–Pol η association.
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Affiliation(s)
- Xiaolu Ma
- College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan, China; State Key Laboratory of Membrane Biology, Institute of Zoology, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, China
| | - Chen Wang
- Clinical and Translational Research Center of Shanghai First Maternity & Infant Hospital, Shanghai Key Laboratory of Signaling and Disease Research, School of Life Sciences and Technology, Tongji University, Shanghai, China
| | - Bo Zhou
- CAS Key Laboratory of Genomics and Precision Medicine, Beijing Institute of Genomics, University of Chinese Academy of Sciences, Chinese Academy of Sciences/China National Center for Bioinformation, Beijing, China
| | - Zina Cheng
- College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan, China
| | - Zhiyong Mao
- Clinical and Translational Research Center of Shanghai First Maternity & Infant Hospital, Shanghai Key Laboratory of Signaling and Disease Research, School of Life Sciences and Technology, Tongji University, Shanghai, China
| | - Tie-Shan Tang
- State Key Laboratory of Membrane Biology, Institute of Zoology, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, China; Institute for Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing, China; Beijing Institute for Stem Cell and Regenerative Medicine, Beijing, China.
| | - Caixia Guo
- CAS Key Laboratory of Genomics and Precision Medicine, Beijing Institute of Genomics, University of Chinese Academy of Sciences, Chinese Academy of Sciences/China National Center for Bioinformation, Beijing, China.
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Lerner LK, Moreno NC, Rocha CRR, Munford V, Santos V, Soltys DT, Garcia CCM, Sarasin A, Menck CFM. XPD/ERCC2 mutations interfere in cellular responses to oxidative stress. Mutagenesis 2020; 34:341-354. [PMID: 31348825 DOI: 10.1093/mutage/gez020] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Accepted: 07/10/2019] [Indexed: 01/28/2023] Open
Abstract
Nucleotide excision repair (NER) is a conserved, flexible mechanism responsible for the removal of bulky, helix-distorting DNA lesions, like ultraviolet damage or cisplatin adducts, but its role in the repair of lesions generated by oxidative stress is still not clear. The helicase XPD/ERCC2, one of the two helicases of the transcription complex IIH, together with XPB, participates both in NER and in RNA pol II-driven transcription. In this work, we investigated the responses of distinct XPD-mutated cell lines to the oxidative stress generated by photoactivated methylene blue (MB) and KBrO3 treatments. The studied cells are derived from patients with XPD mutations but expressing different clinical phenotypes, including xeroderma pigmentosum (XP), XP and Cockayne syndrome (XP-D/CS) and trichothiodystrophy (TTD). We show by different approaches that all XPD-mutated cell lines tested were sensitive to oxidative stress, with those from TTD patients being the most sensitive. Host cell reactivation (HCR) assays showed that XP-D/CS and TTD cells have severely impaired repair capacity of oxidised lesions in plasmid DNA, and alkaline comet assays demonstrated the induction of significantly higher amounts of DNA strand breaks after treatment with photoactivated MB in these cells compared to wild-type cells. All XPD-mutated cells presented strong S/G2 arrest and persistent γ-H2AX staining after photoactivated MB treatment. Taken together, these results indicate that XPD participates in the repair of lesions induced by the redox process, and that XPD mutations lead to differences in the response to oxidatively induced damage.
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Affiliation(s)
- Leticia K Lerner
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - Natália C Moreno
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - Clarissa R R Rocha
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - Veridiana Munford
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - Valquíria Santos
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - Daniela T Soltys
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - Camila C M Garcia
- Department of Biological Sciences, Federal University of Ouro Preto, Ouro Preto, MG, Brazil
| | - Alain Sarasin
- CNRS-UMR8200, Institut Gustave Roussy, Université Paris-Sud, Villejuif, France
| | - Carlos F M Menck
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
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Ferlazzo M, Berthel E, Granzotto A, Devic C, Sonzogni L, Bachelet JT, Pereira S, Bourguignon M, Sarasin A, Mezzina M, Foray N. Some mutations in the xeroderma pigmentosum D gene may lead to moderate but significant radiosensitivity associated with a delayed radiation-induced ATM nuclear localization. Int J Radiat Biol 2019; 96:394-410. [PMID: 31738647 DOI: 10.1080/09553002.2020.1694189] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Purpose: Xeroderma Pigmentosum (XP) is a rare, recessive genetic disease associated with photosensitivity, skin cancer proneness, neurological abnormalities and impaired nucleotide excision repair of the UV-induced DNA damage. Less frequently, XP can be associated with sensitivity to ionizing radiation (IR). Here, a complete radiobiological characterization was performed on a panel of fibroblasts derived from XP-group D patients (XPD).Materials and methods: Cellular radiosensitivity and the functionality of the recognition and repair of chromosome breaks and DNA double-strand breaks (DSB) was evaluated by different techniques including clonogenic cell survival, micronuclei, premature chromosome condensation, pulsed-field gel electrophoresis, chromatin decondensation and immunofluorescence assays. Quantitative correlations between each endpoint were analyzed systematically.Results: Among the seven fibroblast cell lines tested, those derived from three non-relative patients holding the p.[Arg683Trp];[Arg616Pro] XPD mutations showed significant cellular radiosensitivity, high yield of residual micronuclei, incomplete DSB recognition, DSB and chromosome repair defects, impaired ATM, MRE11 relocalization, significant chromatin decondensation. Interestingly, XPD transduction and treatment with statins and bisphosphonates known to accelerate the radiation-induced ATM nucleoshuttling led to significant complementation of these impairments.Conclusions: Our findings suggest that some subsets of XPD patients may be at risk of radiosensitivity reactions and treatment with statins and bisphosphonates may be an interesting approach of radioprotection countermeasure. Different mechanistic models were discussed to better understand the potential specificity of the p.[Arg683Trp];[Arg616Pro] XPD mutations.
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Affiliation(s)
- Mélanie Ferlazzo
- Institut National de la Santé et de la Recherche Médicale, UA8 Unit, "Radiations: Defense, Health and Environment" Centre Léon-Bérard, Lyon, France
| | - Elise Berthel
- Institut National de la Santé et de la Recherche Médicale, UA8 Unit, "Radiations: Defense, Health and Environment" Centre Léon-Bérard, Lyon, France
| | - Adeline Granzotto
- Institut National de la Santé et de la Recherche Médicale, UA8 Unit, "Radiations: Defense, Health and Environment" Centre Léon-Bérard, Lyon, France
| | - Clément Devic
- Institut National de la Santé et de la Recherche Médicale, UA8 Unit, "Radiations: Defense, Health and Environment" Centre Léon-Bérard, Lyon, France.,Fibermetrix, Entzheim, France
| | - Laurène Sonzogni
- Institut National de la Santé et de la Recherche Médicale, UA8 Unit, "Radiations: Defense, Health and Environment" Centre Léon-Bérard, Lyon, France
| | - Jean-Thomas Bachelet
- Institut National de la Santé et de la Recherche Médicale, UA8 Unit, "Radiations: Defense, Health and Environment" Centre Léon-Bérard, Lyon, France
| | - Sandrine Pereira
- Institut National de la Santé et de la Recherche Médicale, UA8 Unit, "Radiations: Defense, Health and Environment" Centre Léon-Bérard, Lyon, France
| | - Michel Bourguignon
- Institut National de la Santé et de la Recherche Médicale, UA8 Unit, "Radiations: Defense, Health and Environment" Centre Léon-Bérard, Lyon, France.,Faculté de Médecine Simone-Veil, Université Paris-Saclay, Versailles, France
| | - Alain Sarasin
- Centre National de la Recherche Scientifique, UMR 8200, Institut Gustave-Roussy, Villejuif, France
| | - Mauro Mezzina
- European Association for Scientific Career Orientation, Paray-Vieille-Poste, France
| | - Nicolas Foray
- Institut National de la Santé et de la Recherche Médicale, UA8 Unit, "Radiations: Defense, Health and Environment" Centre Léon-Bérard, Lyon, France
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Hong WJ, Lee SE, Roh MR, Kim JE, Nishigori C, Kim SC. Angiosarcoma arising on the scalp in a Korean patient with xeroderma pigmentosum variant type. PHOTODERMATOLOGY PHOTOIMMUNOLOGY & PHOTOMEDICINE 2018; 34:343-346. [DOI: 10.1111/phpp.12391] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 04/17/2018] [Indexed: 11/27/2022]
Affiliation(s)
- Won Jin Hong
- Department of Dermatology; Gangnam Severance Hospital; Cutaneous Biology Research Institute; Yonsei University College of Medicine; Seoul Korea
| | - Sang Eun Lee
- Department of Dermatology; Gangnam Severance Hospital; Cutaneous Biology Research Institute; Yonsei University College of Medicine; Seoul Korea
| | - Mi Ryung Roh
- Department of Dermatology; Gangnam Severance Hospital; Cutaneous Biology Research Institute; Yonsei University College of Medicine; Seoul Korea
| | - Jee Eun Kim
- Department of Dermatology; Gangnam Severance Hospital; Cutaneous Biology Research Institute; Yonsei University College of Medicine; Seoul Korea
| | - Chikako Nishigori
- Division of Dermatology; Graduate School of Medicine; Kobe University; Kobe Japan
| | - Soo-Chan Kim
- Department of Dermatology; Gangnam Severance Hospital; Cutaneous Biology Research Institute; Yonsei University College of Medicine; Seoul Korea
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Averbeck D, Salomaa S, Bouffler S, Ottolenghi A, Smyth V, Sabatier L. Progress in low dose health risk research. MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH 2018; 776:46-69. [DOI: 10.1016/j.mrrev.2018.04.001] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Revised: 04/11/2018] [Accepted: 04/12/2018] [Indexed: 12/11/2022]
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Avila AI, Illing A, Becker F, Maerz LD, Morita Y, Philipp M, Burkhalter MD. Xpg limits the expansion of haematopoietic stem and progenitor cells after ionising radiation. Nucleic Acids Res 2016; 44:6252-61. [PMID: 27137888 PMCID: PMC5291257 DOI: 10.1093/nar/gkw376] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Accepted: 04/25/2016] [Indexed: 12/17/2022] Open
Abstract
Reduced capacity of genome maintenance represents a problem for any organism, potentially causing premature death, carcinogenesis, or accelerated ageing. Strikingly though, loss of certain genome stability factors can be beneficial, especially for the maintenance of tissue stem cells of the intestine and the haematopoietic system. We therefore screened for genome stability factors negatively impacting maintenance of haematopoietic stem cells (HSC) in the context of ionising radiation (IR). We found that in vivo knock down of Xeroderma pigmentosum, complementation group G (Xpg) causes elevation of HSC numbers after IR treatment, while numbers of haematopoietic progenitors are elevated to a lesser extent. IR rapidly induces Xpg both on mRNA and on protein level. Prevention of this induction does not influence activation of the checkpoint cascade, yet attenuates late checkpoint steps such as induction of p21 and Noxa. This causes a leaky cell cycle arrest and lower levels of apoptosis, both contributing to increased colony formation and transformation rates. Xpg thus helps to adequately induce DNA damage responses after IR, thereby keeping the expansion of damaged cells under control. This represents a new function of Xpg in the response to IR, in addition to its well-characterized role in nucleotide excision repair.
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Affiliation(s)
- Alush I Avila
- Leibniz Institute on Aging, Fritz Lipmann Institute, 07745 Jena, Germany
| | - Anett Illing
- Department of Internal Medicine I, Ulm University, 89081 Ulm, Germany
| | - Friedrich Becker
- Leibniz Institute on Aging, Fritz Lipmann Institute, 07745 Jena, Germany
| | - Lars D Maerz
- Institute for Biochemistry and Molecular Biology, Ulm University, 89081 Ulm, Germany
| | - Yohei Morita
- Leibniz Institute on Aging, Fritz Lipmann Institute, 07745 Jena, Germany
| | - Melanie Philipp
- Institute for Biochemistry and Molecular Biology, Ulm University, 89081 Ulm, Germany
| | - Martin D Burkhalter
- Leibniz Institute on Aging, Fritz Lipmann Institute, 07745 Jena, Germany Institute for Biochemistry and Molecular Biology, Ulm University, 89081 Ulm, Germany
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8
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Jaarsma D, van der Pluijm I, van der Horst GT, Hoeijmakers JH. Cockayne syndrome pathogenesis: Lessons from mouse models. Mech Ageing Dev 2013; 134:180-95. [DOI: 10.1016/j.mad.2013.04.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Revised: 03/04/2013] [Accepted: 04/08/2013] [Indexed: 10/27/2022]
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Nicolay NH, Carter R, Hatch SB, Schultz N, Prevo R, McKenna WG, Helleday T, Sharma RA. Homologous recombination mediates S-phase-dependent radioresistance in cells deficient in DNA polymerase eta. Carcinogenesis 2012; 33:2026-34. [PMID: 22822095 DOI: 10.1093/carcin/bgs239] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
DNA polymerase eta (pol η) is the only DNA polymerase causally linked to carcinogenesis in humans. Inherited deficiency of pol η in the variant form of xeroderma pigmentosum (XPV) predisposes to UV-light-induced skin cancer. Pol η-deficient cells demonstrate increased sensitivity to cisplatin and oxaliplatin chemotherapy. We have found that XP30R0 fibroblasts derived from a patient with XPV are more resistant to cell kill by ionising radiation (IR) than the same cells complemented with wild-type pol η. This phenomenon has been confirmed in Burkitt's lymphoma cells, which either expressed wild-type pol η or harboured a pol η deletion. Pol η deficiency was associated with accumulation of cells in S-phase, which persisted after IR. Cells deficient in pol η demonstrated increased homologous recombination (HR)-directed repair of double strand breaks created by IR. Depletion of the HR protein, X-ray repair cross-complementing protein 3 (XRCC3), abrogated the radioresistance observed in pol η-deficient cells as compared with pol η-complemented cells. These findings suggest that HR mediates S-phase-dependent radioresistance associated with pol η deficiency. We propose that pol η protein levels in tumours may potentially be used to identify patients who require treatment with chemo-radiotherapy rather than radiotherapy alone for adequate tumour control.
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Affiliation(s)
- Nils H Nicolay
- Cancer Research UK-Medical Research Council Gray Institute for Radiation Oncology and Biology, Oncology Department, Old Road Campus Research Building, University of Oxford, Oxford OX3 7DQ, UK
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10
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Sharma S, Hicks JK, Chute CL, Brennan JR, Ahn JY, Glover TW, Canman CE. REV1 and polymerase ζ facilitate homologous recombination repair. Nucleic Acids Res 2011; 40:682-91. [PMID: 21926160 PMCID: PMC3258153 DOI: 10.1093/nar/gkr769] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
REV1 and DNA Polymerase ζ (REV3 and REV7) play important roles in translesion DNA synthesis (TLS) in which DNA replication bypasses blocking lesions. REV1 and Polζ have also been implicated in promoting repair of DNA double-stranded breaks (DSBs). However, the mechanism by which these two TLS polymerases increase tolerance to DSBs is poorly understood. Here we demonstrate that full-length human REV1, REV3 and REV7 interact in vivo (as determined by co-immunoprecipitation studies) and together, promote homologous recombination repair. Cells lacking REV3 were hypersensitive to agents that cause DSBs including the PARP inhibitor, olaparib. REV1, REV3 or REV7-depleted cells displayed increased chromosomal aberrations, residual DSBs and sites of HR repair following exposure to ionizing radiation. Notably, cells depleted of DNA polymerase η (Polη) or the E3 ubiquitin ligase RAD18 were proficient in DSB repair following exposure to IR indicating that Polη-dependent lesion bypass or RAD18-dependent monoubiquitination of PCNA are not necessary to promote REV1 and Polζ-dependent DNA repair. Thus, the REV1/Polζ complex maintains genomic stability by directly participating in DSB repair in addition to the canonical TLS pathway.
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Affiliation(s)
- Shilpy Sharma
- Department of Pharmacology, The University of Michigan Medical School, Ann Arbor, Michigan 48109, USA
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Ben Salah H, Bahri M, Turki H, Abdelmoula M, Frikha M, Daoud J. Radiothérapie des cancers cutanés au cours du xeroderma pigmentosum. Cancer Radiother 2011; 15:400-3. [DOI: 10.1016/j.canrad.2011.02.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2009] [Revised: 02/16/2011] [Accepted: 02/17/2011] [Indexed: 10/18/2022]
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12
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Cramers P, Verhoeven EE, Filon AR, Rockx DAP, Santos SJ, van der Leer AA, Kleinjans JCS, van Zeeland AA, Mullenders LHF. Impaired repair of ionizing radiation-induced DNA damage in Cockayne syndrome cells. Radiat Res 2011; 175:432-43. [PMID: 21299404 DOI: 10.1667/rr1972.1] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Cockayne syndrome (CS) cells are defective in transcription-coupled repair (TCR) and sensitive to oxidizing agents, including ionizing radiation. We examined the hypothesis that TCR plays a role in ionizing radiation-induced oxidative DNA damage repair or alternatively that CS plays a role in transcription elongation after irradiation. Irradiation with doses up to 100 Gy did not inhibit RNA polymerase II-dependent transcription in normal and CS-B fibroblasts. In contrast, RNA polymerase I-dependent transcription was severely inhibited at 5 Gy in normal cells, indicating different mechanisms of transcription response to X rays. The frequency of radiation-induced base damage was 2 × 10(-7) lesions/base/Gy, implying that 150 Gy is required to induce one lesion/30-kb transcription unit; no TCR of X-ray-induced base damage in the p53 gene was observed. Therefore, it is highly unlikely that defective TCR underlies the sensitivity of CS to ionizing radiation. Overall genome repair levels of radiation-induced DNA damage measured by repair replication were significantly reduced in CS-A and CS-B cells. Taken together, the results do not provide evidence for a key role of TCR in repair of radiation-induced oxidative damages in human cells; rather, impaired repair of oxidative lesions throughout the genome may contribute to the CS phenotype.
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Affiliation(s)
- Patricia Cramers
- Department of Toxicogenetics, Leiden University Medical Center, Einthovenweg 20, 2300 RC Leiden, The Netherlands
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Schaffer JV, Orlow SJ. Radiation Therapy for High-Risk Squamous Cell Carcinomas in Patients with Xeroderma Pigmentosum: Report of Two Cases and Review of the Literature. Dermatology 2011; 223:97-103. [PMID: 22024645 DOI: 10.1159/000324509] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2010] [Accepted: 01/21/2011] [Indexed: 11/19/2022] Open
Affiliation(s)
- Julie V Schaffer
- Ronald O. Perelman Department of Dermatology, New York University School of Medicine, New York, NY 10016, USA. julie.schaffer @ nyumc.org
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14
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Intrinsic radiosensitivity correlated with radiation-induced ROS and cell cycle regulation. Mol Cell Toxicol 2010. [DOI: 10.1007/s13273-010-0001-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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