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Gautam A, Fawcett H, Burdova K, Brazina J, Caldecott KW. APE1-dependent base excision repair of DNA photodimers in human cells. Mol Cell 2023; 83:3669-3678.e7. [PMID: 37816354 DOI: 10.1016/j.molcel.2023.09.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 07/26/2023] [Accepted: 09/11/2023] [Indexed: 10/12/2023]
Abstract
UV irradiation induces "bulky" DNA photodimers such as (6-4)-photoproducts and cyclobutane pyrimidine dimers that are removed by nucleotide excision repair, a complex process defective in the sunlight-sensitive and cancer-prone disease xeroderma pigmentosum. Some bacteria and lower eukaryotes can also repair photodimers by enzymatically simpler mechanisms, but such pathways have not been reported in normal human cells. Here, we have identified such a mechanism. We show that normal human cells can employ a DNA base excision repair process involving NTH1, APE1, PARP1, XRCC1, and FEN1 to rapidly remove a subset of photodimers at early times following UVC irradiation. Loss of these proteins slows the early rate of repair of photodimers in normal cells, ablates their residual repair in xeroderma pigmentosum cells, and increases UVC sensitivity ∼2-fold. These data reveal that human cells can excise photodimers using a long-patch base excision repair process that functions additively but independently of nucleotide excision repair.
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Affiliation(s)
- Amit Gautam
- Genome Damage and Stability Centre, School of Life Sciences, University of Sussex, Brighton, UK
| | - Heather Fawcett
- Genome Damage and Stability Centre, School of Life Sciences, University of Sussex, Brighton, UK
| | - Kamila Burdova
- Genome Damage and Stability Centre, School of Life Sciences, University of Sussex, Brighton, UK; Laboratory of Genome Dynamics, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague 4, Prague, Czech Republic
| | - Jan Brazina
- Genome Damage and Stability Centre, School of Life Sciences, University of Sussex, Brighton, UK
| | - Keith W Caldecott
- Genome Damage and Stability Centre, School of Life Sciences, University of Sussex, Brighton, UK.
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2
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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] [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‐Oncology Dalal Jamm National University Hospital Dakar Senegal
| | - Benkhaled Sofian
- Institut Jules‐Bordet, Department of Radiation Oncology Université Libre de Bruxelles Brussels Belgium
| | - Guèye Latifatou
- Department of Radiation‐Oncology Dalal Jamm National University Hospital Dakar Senegal
| | | | - Gaye Papa Macoumba
- Department of Radiation‐Oncology Dalal Jamm National University Hospital Dakar Senegal
| | | | - Van Gestel Dirk
- Institut Jules‐Bordet, Department of Radiation Oncology Université Libre de Bruxelles Brussels Belgium
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3
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Senju C, Nakazawa Y, Shimada M, Iwata D, Matsuse M, Tanaka K, Miyazaki Y, Moriwaki S, Mitsutake N, Ogi T. Aicardi-Goutières syndrome with SAMHD1 deficiency can be diagnosed by unscheduled DNA synthesis test. Front Pediatr 2022; 10:1048002. [PMID: 36405817 PMCID: PMC9673124 DOI: 10.3389/fped.2022.1048002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Accepted: 10/14/2022] [Indexed: 11/06/2022] Open
Abstract
Aicardi-Goutières syndrome (AGS) is a rare genetic disorder characterised by progressive encephalopathy, involving microcephaly, intracranial calcification, and cerebrospinal fluid lymphocytosis with increased interferon-α concentrations. The clinical features of AGS overlap with fetal cerebral anomalies caused by congenital infections, such as TORCH (toxoplasmosis, other, rubella, cytomegalovirus, and herpes), or with those of other genetic disorders showing neonatal microcephaly, including Cockayne syndrome (CS) with transcription-coupled DNA repair deficiency, and Seckel syndrome (SS) showing aberrant cell-cycle checkpoint signaling. Therefore, a differential diagnosis to confirm the genetic cause or a proof of infection should be considered. In this report, we describe an individual who showed primordial dwarfism and encephalopathy, and whose initial diagnosis was CS. First, we conducted conventional DNA repair proficiency tests for the patient derived fibroblast cells. Transcription-coupled nucleotide excision repair (TC-NER) activity, which is mostly compromised in CS cases, was slightly reduced in the patient's cells. However, unscheduled DNA synthesis (UDS) was significantly diminished. These cellular traits were inconsistent with the diagnosis of CS. We further performed whole exome sequencing for the case and identified a compound heterozygous loss-of-function variants in the SAMHD1 gene, mutations in which are known to cause AGS. As SAMHD1 encodes deoxyribonucleoside triphosphate triphosphohydrolase, we reasoned that the deoxyribonucleoside triphosphate (dNTP) pool size in the patient's cells was elevated, and the labeling efficiency of UDS-test was hindered due to the reduced concentration of phosphorylated ethynyl deoxyuridine (EdU), a nucleoside analogue used for the assay. In conclusion, UDS assay may be a useful diagnostic tool to distinguish between AGS with SAMHD1 mutations and other related diseases.
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Affiliation(s)
- Chikako Senju
- Department of Hematology, Atomic Bomb Disease Institute, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.,Department of Plastic and Reconstructive Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.,Department of Genetics, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan.,Department of Human Genetics and Molecular Biology, Graduate School of Medicine, Nagoya University, Nagoya, Japan.,Department of Genome Repair, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan
| | - Yuka Nakazawa
- Department of Genetics, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan.,Department of Human Genetics and Molecular Biology, Graduate School of Medicine, Nagoya University, Nagoya, Japan.,Department of Genome Repair, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan
| | - Mayuko Shimada
- Department of Genetics, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan.,Department of Human Genetics and Molecular Biology, Graduate School of Medicine, Nagoya University, Nagoya, Japan.,Department of Genome Repair, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan
| | - Dai Iwata
- Department of Genetics, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan.,Department of Human Genetics and Molecular Biology, Graduate School of Medicine, Nagoya University, Nagoya, Japan
| | - Michiko Matsuse
- Department of Radiation Medical Sciences, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan
| | - Katsumi Tanaka
- Department of Plastic and Reconstructive Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Yasushi Miyazaki
- Department of Hematology, Atomic Bomb Disease Institute, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Shinichi Moriwaki
- Department of Dermatology, Osaka Medical and Pharmaceutical University, Takatsuki, Japan
| | - Norisato Mitsutake
- Department of Radiation Medical Sciences, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan
| | - Tomoo Ogi
- Department of Genetics, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan.,Department of Human Genetics and Molecular Biology, Graduate School of Medicine, Nagoya University, Nagoya, Japan.,Department of Genome Repair, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan
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4
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El-Nachef L, Al-Choboq J, Restier-Verlet J, Granzotto A, Berthel E, Sonzogni L, Ferlazzo ML, Bouchet A, Leblond P, Combemale P, Pinson S, Bourguignon M, Foray N. Human Radiosensitivity and Radiosusceptibility: What Are the Differences? Int J Mol Sci 2021; 22:7158. [PMID: 34281212 PMCID: PMC8267933 DOI: 10.3390/ijms22137158] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 06/25/2021] [Accepted: 06/28/2021] [Indexed: 12/27/2022] Open
Abstract
The individual response to ionizing radiation (IR) raises a number of medical, scientific, and societal issues. While the term "radiosensitivity" was used by the pioneers at the beginning of the 20st century to describe only the radiation-induced adverse tissue reactions related to cell death, a confusion emerged in the literature from the 1930s, as "radiosensitivity" was indifferently used to describe the toxic, cancerous, or aging effect of IR. In parallel, the predisposition to radiation-induced adverse tissue reactions (radiosensitivity), notably observed after radiotherapy appears to be caused by different mechanisms than those linked to predisposition to radiation-induced cancer (radiosusceptibility). This review aims to document these differences in order to better estimate the different radiation-induced risks. It reveals that there are very few syndromes associated with the loss of biological functions involved directly in DNA damage recognition and repair as their role is absolutely necessary for cell viability. By contrast, some cytoplasmic proteins whose functions are independent of genome surveillance may also act as phosphorylation substrates of the ATM protein to regulate the molecular response to IR. The role of the ATM protein may help classify the genetic syndromes associated with radiosensitivity and/or radiosusceptibility.
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Affiliation(s)
- Laura El-Nachef
- Inserm, U1296 unit, Radiation: Defense, Health and Environment, Centre Léon-Bérard, 28, rue Laennec, 69008 Lyon, France; (L.E.-N.); (J.A.-C.); Juliette.Restier-- (J.R.-V.); (A.G.); (E.B.); (L.S.); (M.L.F.); (A.B.); (M.B.)
| | - Joelle Al-Choboq
- Inserm, U1296 unit, Radiation: Defense, Health and Environment, Centre Léon-Bérard, 28, rue Laennec, 69008 Lyon, France; (L.E.-N.); (J.A.-C.); Juliette.Restier-- (J.R.-V.); (A.G.); (E.B.); (L.S.); (M.L.F.); (A.B.); (M.B.)
| | - Juliette Restier-Verlet
- Inserm, U1296 unit, Radiation: Defense, Health and Environment, Centre Léon-Bérard, 28, rue Laennec, 69008 Lyon, France; (L.E.-N.); (J.A.-C.); Juliette.Restier-- (J.R.-V.); (A.G.); (E.B.); (L.S.); (M.L.F.); (A.B.); (M.B.)
| | - Adeline Granzotto
- Inserm, U1296 unit, Radiation: Defense, Health and Environment, Centre Léon-Bérard, 28, rue Laennec, 69008 Lyon, France; (L.E.-N.); (J.A.-C.); Juliette.Restier-- (J.R.-V.); (A.G.); (E.B.); (L.S.); (M.L.F.); (A.B.); (M.B.)
| | - Elise Berthel
- Inserm, U1296 unit, Radiation: Defense, Health and Environment, Centre Léon-Bérard, 28, rue Laennec, 69008 Lyon, France; (L.E.-N.); (J.A.-C.); Juliette.Restier-- (J.R.-V.); (A.G.); (E.B.); (L.S.); (M.L.F.); (A.B.); (M.B.)
- Neolys Diagnostics, 67960 Entzheim, France
| | - Laurène Sonzogni
- Inserm, U1296 unit, Radiation: Defense, Health and Environment, Centre Léon-Bérard, 28, rue Laennec, 69008 Lyon, France; (L.E.-N.); (J.A.-C.); Juliette.Restier-- (J.R.-V.); (A.G.); (E.B.); (L.S.); (M.L.F.); (A.B.); (M.B.)
| | - Mélanie L. Ferlazzo
- Inserm, U1296 unit, Radiation: Defense, Health and Environment, Centre Léon-Bérard, 28, rue Laennec, 69008 Lyon, France; (L.E.-N.); (J.A.-C.); Juliette.Restier-- (J.R.-V.); (A.G.); (E.B.); (L.S.); (M.L.F.); (A.B.); (M.B.)
| | - Audrey Bouchet
- Inserm, U1296 unit, Radiation: Defense, Health and Environment, Centre Léon-Bérard, 28, rue Laennec, 69008 Lyon, France; (L.E.-N.); (J.A.-C.); Juliette.Restier-- (J.R.-V.); (A.G.); (E.B.); (L.S.); (M.L.F.); (A.B.); (M.B.)
| | - Pierre Leblond
- Centre Léon-Bérard, 28, rue Laennec, 69008 Lyon, France; (P.L.); (P.C.)
| | - Patrick Combemale
- Centre Léon-Bérard, 28, rue Laennec, 69008 Lyon, France; (P.L.); (P.C.)
| | - Stéphane Pinson
- Hospices Civils de Lyon, Quai des Célestins, 69002 Lyon, France;
| | - Michel Bourguignon
- Inserm, U1296 unit, Radiation: Defense, Health and Environment, Centre Léon-Bérard, 28, rue Laennec, 69008 Lyon, France; (L.E.-N.); (J.A.-C.); Juliette.Restier-- (J.R.-V.); (A.G.); (E.B.); (L.S.); (M.L.F.); (A.B.); (M.B.)
- Université Paris Saclay Versailles St Quentin en Yvelines, 78035 Versailles, France
| | - Nicolas Foray
- Inserm, U1296 unit, Radiation: Defense, Health and Environment, Centre Léon-Bérard, 28, rue Laennec, 69008 Lyon, France; (L.E.-N.); (J.A.-C.); Juliette.Restier-- (J.R.-V.); (A.G.); (E.B.); (L.S.); (M.L.F.); (A.B.); (M.B.)
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5
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El-Garawani I, Allam HK, Shehata YA, Fadel K, El Kattan A. Genotoxicity linked to occupational exposure in uranium mine workers: Granzyme B and apoptotic changes. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:36793-36802. [PMID: 33710487 DOI: 10.1007/s11356-021-13323-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2020] [Accepted: 03/03/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND Uranium mining and processing are an ancient occupation, recognized as being grueling and accountable for injury and disease. Uranium (U) is a radioactive heavy metal used in many industrial applications. It increases the micronuclei frequencies as well as chromosomal aberration and sister chromatid exchange in peripheral blood lymphocytes. Granzyme B and perforin are stored inside the leukocytes in secretory granules. These proteins are released outside the cells by a cell-to-cell contact under specific conditions for inducing apoptosis. So, this study investigated the potential health hazards with prominence on the biological effects of radiation exposure. METHODS A cross-sectional analytic research was conducted on Egyptian male mining field workers. Leucocytes' genotoxicity was evaluated using DNA fragmentation assay and comet assay. Furthermore, flow cytometric analysis of Granzyme B protein was done. RESULTS A significant increase in dead cells after dual acridine orange/ethidium bromide (AO/EB) fluorescent staining in radiation-exposed groups was noticed compared to control groups. Moreover, a significant increase in the fragmented DNA was evident in exposed groups relative to the control one. Granzyme B protein levels showed a significant increase concerning control. CONCLUSION A wide variety of adverse human health risks are considered a potential risk to Egyptian uranium miners. For employers working in both mining and processing fields, the most common molecular shift highlighted was the leucocyte damage in blood samples. To preserve the health of all employees, health education and administration of effective hazard management procedures are necessary.
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Affiliation(s)
- Islam El-Garawani
- Department of Zoology, Faculty of Science, Menoufia University, Menoufia, 32511, Egypt
| | - Heba Khodary Allam
- Public Health and Community Medicine Department, Faculty of Medicine, Menoufia University, Shebin Al-Kom, Menoufia, Egypt.
| | - Yasser A Shehata
- Public Health and Community Medicine Department, Faculty of Medicine, Menoufia University, Shebin Al-Kom, Menoufia, Egypt
| | | | - Ahmed El Kattan
- Medical and Radiological Research Department, NMA, Cairo, Egypt
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6
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de Andrade FAG, Cavalcanti CEDO, Isoldi FC, Ferreira LM. Therapeutics of xeroderma pigmentosum: A PRISMA-compliant systematic review. Indian J Dermatol Venereol Leprol 2021; 87:176-189. [PMID: 33769755 DOI: 10.25259/ijdvl_431_19] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Accepted: 02/01/2020] [Indexed: 01/13/2023]
Abstract
Xeroderma pigmentosum is a rare hereditary autosomal recessive genodermatosis. At present, there are many treatment options for xeroderma pigmentosum, covering medical/procedural, surgical and combined modalities. However, the quality of these interventions has not been assessed. Our study aimed to perform a systematic review of the literature regarding the treatment of xeroderma pigmentosum. Multiple medical databases were accessed with the Medical Subject Headings terms; "xeroderma pigmentosum," "therapeutics" and "surgical procedures, operative" from January 2000 to April 2019, including articles published in Portuguese, Spanish and English (PROSPERO-CRD42018114858). Two hundred and ninety-eight studies were found in the databases researched, of which, after applying the inclusion criteria, only 33 studies remained. The 33 complete articles were read by three of the authors, having been found: 16 reported medical/procedural and 17 reported surgical treatments. Only one clinical study presented a good level of evidence (EL: 2): a randomized clinical trial using a T4 endonuclease V (T4N5) liposome lotion which reduced the development of skin lesions in patients with xeroderma pigmentosum. Amongst surgical modalities, all studies presented low evidence level (EL: 4). Three illustrative cases are also presented, to emphasize the multiple number of times that surgical modalities may be required in these patients. The therapeutic modalities, both clinical and surgical, for xeroderma pigmentosum presented a low level of scientific evidence which did not allow meta-analysis. More therapeutic studies, both clinical and surgical, with better scientific evidence are needed.
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Saha LK, Wakasugi M, Akter S, Prasad R, Wilson SH, Shimizu N, Sasanuma H, Huang SYN, Agama K, Pommier Y, Matsunaga T, Hirota K, Iwai S, Nakazawa Y, Ogi T, Takeda S. Topoisomerase I-driven repair of UV-induced damage in NER-deficient cells. Proc Natl Acad Sci U S A 2020; 117:14412-14420. [PMID: 32513688 PMCID: PMC7321995 DOI: 10.1073/pnas.1920165117] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Nucleotide excision repair (NER) removes helix-destabilizing adducts including ultraviolet (UV) lesions, cyclobutane pyrimidine dimers (CPDs), and pyrimidine (6-4) pyrimidone photoproducts (6-4PPs). In comparison with CPDs, 6-4PPs have greater cytotoxicity and more strongly destabilizing properties of the DNA helix. It is generally believed that NER is the only DNA repair pathway that removes the UV lesions as evidenced by the previous data since no repair of UV lesions was detected in NER-deficient skin fibroblasts. Topoisomerase I (TOP1) constantly creates transient single-strand breaks (SSBs) releasing the torsional stress in genomic duplex DNA. Stalled TOP1-SSB complexes can form near DNA lesions including abasic sites and ribonucleotides embedded in chromosomal DNA. Here we show that base excision repair (BER) increases cellular tolerance to UV independently of NER in cancer cells. UV lesions irreversibly trap stable TOP1-SSB complexes near the UV damage in NER-deficient cells, and the resulting SSBs activate BER. Biochemical experiments show that 6-4PPs efficiently induce stable TOP1-SSB complexes, and the long-patch repair synthesis of BER removes 6-4PPs downstream of the SSB. Furthermore, NER-deficient cancer cell lines remove 6-4PPs within 24 h, but not CPDs, and the removal correlates with TOP1 expression. NER-deficient skin fibroblasts weakly express TOP1 and show no detectable repair of 6-4PPs. Remarkably, the ectopic expression of TOP1 in these fibroblasts led them to completely repair 6-4PPs within 24 h. In conclusion, we reveal a DNA repair pathway initiated by TOP1, which significantly contributes to cellular tolerance to UV-induced lesions particularly in malignant cancer cells overexpressing TOP1.
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Affiliation(s)
- Liton Kumar Saha
- Department of Radiation Genetics, Kyoto University, Graduate School of Medicine, 606-8501 Kyoto, Japan
- Developmental Therapeutics Branch and Laboratory of Molecular Pharmacology, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892
| | - Mitsuo Wakasugi
- Laboratory of Human Molecular Genetics, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 920-1192 Kanazawa, Japan
| | - Salma Akter
- Department of Radiation Genetics, Kyoto University, Graduate School of Medicine, 606-8501 Kyoto, Japan
| | - Rajendra Prasad
- Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, NC 27709
| | - Samuel H Wilson
- Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, NC 27709
| | - Naoto Shimizu
- Department of Radiation Genetics, Kyoto University, Graduate School of Medicine, 606-8501 Kyoto, Japan
| | - Hiroyuki Sasanuma
- Department of Radiation Genetics, Kyoto University, Graduate School of Medicine, 606-8501 Kyoto, Japan
| | - Shar-Yin Naomi Huang
- Developmental Therapeutics Branch and Laboratory of Molecular Pharmacology, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892
| | - Keli Agama
- Developmental Therapeutics Branch and Laboratory of Molecular Pharmacology, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892
| | - Yves Pommier
- Developmental Therapeutics Branch and Laboratory of Molecular Pharmacology, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892
| | - Tsukasa Matsunaga
- Laboratory of Human Molecular Genetics, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 920-1192 Kanazawa, Japan
| | - Kouji Hirota
- Department of Chemistry, Tokyo Metropolitan University, 192-0397 Tokyo, Japan
| | - Shigenori Iwai
- Biological Chemistry Group, Graduate School of Engineering Science, Osaka University, 565-0871 Osaka, Japan
| | - Yuka Nakazawa
- Department of Genetics, Research Institute of Environmental Medicine, Nagoya University, 464-8601 Nagoya, Japan
| | - Tomoo Ogi
- Department of Genetics, Research Institute of Environmental Medicine, Nagoya University, 464-8601 Nagoya, Japan
| | - Shunichi Takeda
- Department of Radiation Genetics, Kyoto University, Graduate School of Medicine, 606-8501 Kyoto, Japan;
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8
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Guardamagna I, Bassi E, Savio M, Perucca P, Cazzalini O, Prosperi E, Stivala LA. A functional in vitro cell-free system for studying DNA repair in isolated nuclei. J Cell Sci 2020; 133:jcs240010. [PMID: 32376788 DOI: 10.1242/jcs.240010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Accepted: 04/19/2020] [Indexed: 12/31/2022] Open
Abstract
Assessment of DNA repair is an important endpoint measurement when studying the biochemical mechanisms of the DNA damage response and when investigating the efficacy of chemotherapy, which often uses DNA-damaging compounds. Numerous in vitro methods to biochemically characterize DNA repair mechanisms have been developed so far. However, such methods have some limitations, which are mainly due to the lack of chromatin organization in the DNA templates used. Here we describe a functional cell-free system to study DNA repair synthesis in vitro, using G1-phase nuclei isolated from human cells treated with different genotoxic agents. Upon incubation in the corresponding damage-activated cytosolic extracts, containing biotinylated dUTP, nuclei were able to initiate DNA repair synthesis. The use of specific DNA synthesis inhibitors markedly decreased biotinylated dUTP incorporation, indicating the specificity of the repair response. Exogenously added human recombinant PCNA protein, but not the sensors of UV-DNA damage DDB2 and DDB1, stimulated UVC-induced dUTP incorporation. In contrast, a DDB2PCNA- mutant protein, unable to associate with PCNA, interfered with DNA repair synthesis. Given its responsiveness to different types of DNA lesions, this system offers an additional tool to study DNA repair mechanisms.This article has an associated First Person interview with the first author of the paper.
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Affiliation(s)
- Isabella Guardamagna
- Dipartimento di Medicina Molecolare, Unità di Immunologia e Patologia generale, Università degli Studi di Pavia, 27100 Pavia, Italy
| | - Elisabetta Bassi
- Dipartimento di Medicina Molecolare, Unità di Immunologia e Patologia generale, Università degli Studi di Pavia, 27100 Pavia, Italy
| | - Monica Savio
- Dipartimento di Medicina Molecolare, Unità di Immunologia e Patologia generale, Università degli Studi di Pavia, 27100 Pavia, Italy
| | - Paola Perucca
- Dipartimento di Medicina Molecolare, Unità di Immunologia e Patologia generale, Università degli Studi di Pavia, 27100 Pavia, Italy
| | - Ornella Cazzalini
- Dipartimento di Medicina Molecolare, Unità di Immunologia e Patologia generale, Università degli Studi di Pavia, 27100 Pavia, Italy
| | - Ennio Prosperi
- Istituto di Genetica Molecolare 'Luigi Luca Cavalli-Sforza', CNR, 27100 Pavia, Italy
| | - Lucia A Stivala
- Dipartimento di Medicina Molecolare, Unità di Immunologia e Patologia generale, Università degli Studi di Pavia, 27100 Pavia, Italy
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9
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The 6-4 photoproduct is the trigger of UV-induced replication blockage and ATR activation. Proc Natl Acad Sci U S A 2020; 117:12806-12816. [PMID: 32444488 DOI: 10.1073/pnas.1917196117] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The most prevalent human carcinogen is sunlight-associated ultraviolet (UV), a physiologic dose of which generates thousands of DNA lesions per cell, mostly of two types: cyclobutane pyrimidine dimers (CPDs) and 6-4 photoproducts (6-4PPs). It has not been possible, in living cells, to precisely characterize the respective contributions of these two lesion types to the signals that regulate cell cycle progression, DNA replication, and cell survival. Here we coupled multiparameter flow cytometry with lesion-specific photolyases that eliminate either CPDs or 6-4PPs and determined their respective contributions to DNA damage responses. Strikingly, only 6-4PP lesions activated the ATR-Chk1 DNA damage response pathway. Mechanistically, 6-4PPs, but not CPDs, impeded DNA replication across the genome as revealed by microfluidic-assisted replication track analysis. Furthermore, single-stranded DNA accumulated preferentially at 6-4PPs during DNA replication, indicating selective and prolonged replication blockage at 6-4PPs. These findings suggest that 6-4PPs, although eightfold fewer in number than CPDs, are the trigger for UV-induced DNA damage responses.
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10
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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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Feroz I, Makhdoomi RH, Khursheed N, Shaheen F, Shah P. Utility of Computed Tomography-guided Biopsy in Evaluation of Metastatic Spinal Lesions. Asian J Neurosurg 2018; 13:577-584. [PMID: 30283508 PMCID: PMC6159094 DOI: 10.4103/ajns.ajns_192_16] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
INTRODUCTION Computed tomography (CT)-guided biopsy of spine is currently a valuable diagnostic tool and effective technique for diagnosing and planning a proper therapeutic strategy for certain spinal lesions. The reported diagnostic accuracy of core biopsy ranges from 77% to 97%. MATERIALS AND METHODS We included all patients with spinal lesions suspicious of metastasis on magnetic resonance imaging, who presented between May 2012 and April 2014 and underwent CT-guided biopsy in our study. A total of thirty patients with spinal lesions were evaluated. RESULTS Majority presented in the seventh decade of their life (average age = 53.93; age range = 10-72 years). Male:female ratio was 1.5:1. Pain was the most common presenting symptom (100%). Lumbar spine was the most common site of lesion followed by dorsal spine. Biopsy is the gold standard in histopathological evaluation of spinal lesions. Metastatic lesion was diagnosed in 12 (40%) cases, plasmacytoma in 12 (40%) cases, non-Hodgkin's lymphoma in 2 (6.66%) cases, small round cell tumor in 1 (3.33%) case, nonspecific chronic inflammation in two patients, and necrosis with no viable cells in one patient. The most common malignancy to metastasize to spine was adenocarcinoma. The most common primary tumor of spine was plasmacytoma - multiple myeloma. CONCLUSION CCT-guided biopsy is a safe procedure, and no procedure-related complication was seen in any patient.
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Affiliation(s)
- Imza Feroz
- Department of Pathology, Sher-I-Kashmir Institute of Medical Sciences, Srinagar, Jammu and Kashmir, India
| | - Rumana Hamid Makhdoomi
- Department of Pathology, Sher-I-Kashmir Institute of Medical Sciences, Srinagar, Jammu and Kashmir, India
| | - Nayil Khursheed
- Department of Neurosurgery, Sher-I-Kashmir Institute of Medical Sciences, Srinagar, Jammu and Kashmir, India
| | - Feroze Shaheen
- Department of Radiodiagnosis, Sher-I-Kashmir Institute of Medical Sciences, Srinagar, Jammu and Kashmir, India
| | - Parveen Shah
- Department of Pathology, Sher-I-Kashmir Institute of Medical Sciences, Srinagar, Jammu and Kashmir, India
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Mutations in Cockayne Syndrome-Associated Genes (Csa and Csb) Predispose to Cisplatin-Induced Hearing Loss in Mice. J Neurosci 2017; 36:4758-70. [PMID: 27122034 DOI: 10.1523/jneurosci.3890-15.2016] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Accepted: 03/16/2016] [Indexed: 12/22/2022] Open
Abstract
UNLABELLED Cisplatin is a common and effective chemotherapeutic agent, yet it often causes permanent hearing loss as a result of sensory hair cell death. The causes of sensitivity to DNA-damaging agents in nondividing cell populations, such as cochlear hair and supporting cells, are poorly understood, as are the specific DNA repair pathways that protect these cells. Nucleotide excision repair (NER) is a conserved and versatile DNA repair pathway for many DNA-distorting lesions, including cisplatin-DNA adducts. Progressive sensorineural hearing loss is observed in a subset of NER-associated DNA repair disorders including Cockayne syndrome and some forms of xeroderma pigmentosum. We investigated whether either of the two overlapping branches that encompass NER, transcription-coupled repair or global genome repair, which are implicated in Cockayne syndrome and xeroderma pigmentosum group C, respectively, modulates cisplatin-induced hearing loss and cell death in the organ of Corti, the auditory sensory epithelium of mammals. We report that cochlear hair cells and supporting cells in transcription-coupled repair-deficient Cockayne syndrome group A (Csa(-/-)) and group B (Csb(-/-)) mice are hypersensitive to cisplatin, in contrast to global genome repair-deficient Xpc(-/-) mice, both in vitro and in vivo We show that sensory hair cells in Csa(-/-) and Csb(-/-) mice fail to remove cisplatin-DNA adducts efficiently in vitro; and unlike Xpc(-/-) mice, Csa(-/-) and Csb(-/-) mice lose hearing and manifest outer hair cell degeneration after systemic cisplatin treatment. Our results demonstrate that Csa and Csb deficiencies predispose to cisplatin-induced hearing loss and hair/supporting cell damage in the mammalian organ of Corti, and emphasize the importance of transcription-coupled DNA repair in the protection against cisplatin ototoxicity. SIGNIFICANCE STATEMENT The utility of cisplatin in chemotherapy remains limited due to serious side effects, including sensorineural hearing loss. We show that mouse models of Cockayne syndrome, a progeroid disorder resulting from a defect in the transcription-coupled DNA repair (TCR) branch of nucleotide excision repair, are hypersensitive to cisplatin-induced hearing loss and sensory hair cell death in the organ of Corti, the mammalian auditory sensory epithelium. Our work indicates that Csa and Csb, two genes involved in TCR, are preferentially required to protect against cisplatin ototoxicity, relative to global genome repair-specific elements of nucleotide excision repair, and suggests that TCR is a major force maintaining DNA integrity in the cochlea. The Cockayne syndrome mice thus represent a model for testing the contribution of DNA repair mechanisms to cisplatin ototoxicity.
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Adam-Zahir S, Plowman PN, Bourton EC, Sharif F, Parris CN. Increased γ-H2AX and Rad51 DNA Repair Biomarker Expression in Human Cell Lines Resistant to the Chemotherapeutic Agents Nitrogen Mustard and Cisplatin. Chemotherapy 2015; 60:310-20. [PMID: 26138778 DOI: 10.1159/000430086] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Accepted: 04/09/2015] [Indexed: 01/14/2023]
Abstract
Chemotherapeutic anticancer drugs mediate cytotoxicity by a number of mechanisms. However, alkylating agents which induce DNA interstrand crosslinks (ICL) are amongst the most effective anticancer agents and often form the mainstay of many anticancer therapies. The effectiveness of these drugs can be limited by the development of drug resistance in cancer cells and many studies have demonstrated that alterations in DNA repair kinetics are responsible for drug resistance. In this study we developed two cell lines resistant to the alkylating agents nitrogen mustard (HN2) and cisplatin (Pt). To determine if drug resistance was associated with enhanced ICL DNA repair we used immunocytochemistry and imaging flow cytometry to quantitate the number of γ-H2AX and Rad51 foci in the nuclei of cells after drug exposure. γ-H2AX was used to evaluate DNA strand breaks caused by repair incision nucleases and Rad51 was used to measure the activity of homologous recombination in the repair of ICL. In the drug-resistant derivative cell lines there was overall a significant increase in the number and persistence of both γ-H2AX and Rad51 foci in the nuclei of cells over a 72-hour period, when compared to the non-resistant parental cell lines (ANOVA p < 0.0001). In a Pt-resistant ovarian cancer cell line (A2780cis(R)) a similar enhancement of DNA repair was observed when compared to the non-drug-resistant wild-type ovarian cancer cells (A2780) following exposure to HN2. Our data suggest that using DNA repair biomarkers to evaluate mechanisms of resistance in cancer cell lines and human tumours may be of experimental and clinical benefit. We concede, however, that examination of a larger population of cell lines and tumours is required to fully evaluate the validity of this approach.
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Affiliation(s)
- Sheba Adam-Zahir
- Division of Biosciences, Department of Life Sciences, College of Health and Life Sciences, Brunel University, Uxbridge, UK
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14
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Sadek AA, Abdel Samad SN, Bakheet MA, Hassan IA, Abd El-Mageed WM, Emam AM. Multidisciplinary approach for evaluation of neurocutaneous disorders in children in Sohag University Hospital, Upper Egypt. EGYPTIAN JOURNAL OF MEDICAL HUMAN GENETICS 2015. [DOI: 10.1016/j.ejmhg.2015.02.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Rahman T, Sharma JD, Krishnatreya M, Kataki AC. Basaloid Squamous Carcinoma of Skin Associated with Xeroderma Pigmentosum in an 8-year-old Child: A Rare Entity. Indian J Dermatol 2014; 59:632. [PMID: 25484421 PMCID: PMC4248529 DOI: 10.4103/0019-5154.143577] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Xeroderma pigmentosum (XP) is a rare autosomal recessive genodermatosis associated with hypersensitivity to ultraviolet (UV) light, due to defects in deoxyribonucleic acid (DNA) repair. Basaloid squamous cell carcinoma is a rare aggressive variant of squamous cell carcinoma. Patients with XP are at increased risk of developing cutaneous malignancy and are commonly associated with squamous carcinoma. We report an extremely rare case of 8-year-old child with XP along with basaloidsquamous carcinoma of skin; and review of literature related to it.
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Affiliation(s)
- Tashnin Rahman
- Department of Head and Neck Oncology, Dr. B Borooah Cancer Institute, Guwahati, Assam, India
| | - Jagannath D Sharma
- Department of Pathology, Dr. B Borooah Cancer Institute, Guwahati, Assam, India
| | - Manigreeva Krishnatreya
- Department of Head and Neck Oncology, Dr. B Borooah Cancer Institute, Guwahati, Assam, India
| | - Amal C Kataki
- Department of Head and Neck Oncology, Dr. B Borooah Cancer Institute, Guwahati, Assam, India
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Jia N, Nakazawa Y, Guo C, Shimada M, Sethi M, Takahashi Y, Ueda H, Nagayama Y, Ogi T. A rapid, comprehensive system for assaying DNA repair activity and cytotoxic effects of DNA-damaging reagents. Nat Protoc 2014; 10:12-24. [PMID: 25474029 DOI: 10.1038/nprot.2014.194] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
DNA repair systems protect cells from genomic instability and carcinogenesis. Therefore, assays for measuring DNA repair activity are valuable, not only for clinical diagnoses of DNA repair deficiency disorders but also for basic research and anticancer drug development. Two commonly used assays are UDS (unscheduled DNA synthesis, requiring a precise measurement of an extremely small amount of repair DNA synthesis) and RRS (recovery of RNA synthesis after DNA damage). Both UDS and RRS are major endpoints for assessing the activity of nucleotide excision repair (NER), the most versatile DNA repair process. Conventional UDS and RRS assays are laborious and time-consuming, as they measure the incorporation of radiolabeled nucleosides associated with NER. Here we describe a comprehensive protocol for monitoring nonradioactive UDS and RRS by studying the incorporation of alkyne-conjugated nucleoside analogs followed by a fluorescent azide-coupling click-chemistry reaction. The system is also suitable for quick measurement of cell sensitivity to DNA-damaging reagents and for lentivirus-based complementation assays, which can be used to systematically determine the pathogenic genes associated with DNA repair deficiency disorders. A typical UDS or RRS assay using primary fibroblasts, including a virus complementation test, takes 1 week to complete.
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Affiliation(s)
- Nan Jia
- 1] Department of Pharmacology and Therapeutic Innovation, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan. [2] Nagasaki University Research Centre for Genomic Instability and Carcinogenesis (NRGIC), Nagasaki University, Nagasaki, Japan. [3] Department of Molecular Medicine, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan
| | - Yuka Nakazawa
- 1] Nagasaki University Research Centre for Genomic Instability and Carcinogenesis (NRGIC), Nagasaki University, Nagasaki, Japan. [2] Department of Molecular Medicine, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan
| | - Chaowan Guo
- 1] Nagasaki University Research Centre for Genomic Instability and Carcinogenesis (NRGIC), Nagasaki University, Nagasaki, Japan. [2] Department of Molecular Medicine, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan
| | - Mayuko Shimada
- 1] Nagasaki University Research Centre for Genomic Instability and Carcinogenesis (NRGIC), Nagasaki University, Nagasaki, Japan. [2] Department of Molecular Medicine, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan
| | - Mieran Sethi
- St. John's Institute of Dermatology, Guy's and St. Thomas' Hospital, London, UK
| | - Yoshito Takahashi
- Innovative Beauty Science Laboratory, Kanebo Cosmetics Inc., Odawara, Japan
| | - Hiroshi Ueda
- Department of Pharmacology and Therapeutic Innovation, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| | - Yuji Nagayama
- Department of Molecular Medicine, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan
| | - Tomoo Ogi
- 1] Nagasaki University Research Centre for Genomic Instability and Carcinogenesis (NRGIC), Nagasaki University, Nagasaki, Japan. [2] Department of Molecular Medicine, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan. [3] Microbial Genetics Laboratory, Genetic Strains Research Center, National Institute of Genetics, Mishima, Japan
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Elevated expression of artemis in human fibroblast cells is associated with cellular radiosensitivity and increased apoptosis. Br J Cancer 2013; 107:1506-13. [PMID: 23093295 PMCID: PMC3493778 DOI: 10.1038/bjc.2012.443] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
BACKGROUND The objective of this study was to determine the molecular mechanisms responsible for cellular radiosensitivity in two human fibroblast cell lines 84BR and 175BR derived from two cancer patients. METHODS Clonogenic assays were performed following exposure to increasing doses of gamma radiation to confirm radiosensitivity. γ-H2AX foci assays were used to determine the efficiency of DNA double-strand break (DSB) repair in cells. Quantitative PCR (Q-PCR) established the expression levels of key DNA DSB repair genes. Imaging flow cytometry using annexin V-FITC was used to compare artemis expression and apoptosis in cells. RESULTS Clonogenic cellular hypersensitivity in the 84BR and 175BR cell lines was associated with a defect in DNA DSB repair measured by the γ-H2AX foci assay. The Q-PCR analysis and imaging flow cytometry revealed a two-fold overexpression of the artemis DNA repair gene, which was associated with an increased level of apoptosis in the cells before and after radiation exposure. Overexpression of normal artemis protein in a normal immortalised fibroblast cell line NB1-Tert resulted in increased radiosensitivity and apoptosis. CONCLUSION We conclude that elevated expression of artemis is associated with higher levels of DNA DSB, radiosensitivity and elevated apoptosis in two radio-hypersensitive cell lines. These data reveal a potentially novel mechanism responsible for radiosensitivity and show that increased artemis expression in cells can result in either radiation resistance or enhanced sensitivity.
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Sharma S, Deshmukh AD, Bal MM, Chaukar DA, Dcruz AK. Angiosarcoma of the scalp associated with Xeroderma pigmentosum. Indian J Med Paediatr Oncol 2012; 33:126-9. [PMID: 22988356 PMCID: PMC3439790 DOI: 10.4103/0971-5851.99753] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Xeroderma pigmentosum (XP) is a rare autosomal recessive genodermatosis associated with hypersensitivity to ultraviolet light due to defects in Deoxyribonucleic acid (DNA) repair. These patients have more than a 1000-fold increased risk of developing skin cancers. Although multiple cutaneous malignancies are common, the simultaneous occurrence of angiosarcoma and basal cell carcinoma is a rare phenomenon. We report a case of a 25-year-old male with XP with angiosarcoma scalp and basal cell carcinoma of face and occiput and discuss the treatment of this aggressive neoplasm with a review of the literature pertaining to it.
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Affiliation(s)
- Shilpi Sharma
- Department of Head and Neck Surgical Oncology, Tata Memorial Hospital, Mumbai, Maharashtra, India
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Wei CC, Sanfilippo NJ, Myssiorek D. Re-irradiation of metastatic disease in the neck from xeroderma pigmentosum. ACTA ACUST UNITED AC 2011; 17:83-5. [PMID: 20567629 DOI: 10.3747/co.v17i3.479] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Xeroderma pigmentosum, an autosomal recessive disease that occurs with a frequency of 1:250,000, is caused by a genetic defect in nucleotide excision repair enzymes. Mutation of these enzymes leads to the development of multiple basal cell and squamous cell carcinomas. OBJECTIVES We present a case of xeroderma pigmentosum in a patient with cervical and intraparotid metastatic disease from recurrent cutaneous squamous cell carcinomas of the face and scalp, treated with neck dissection and re-irradiation. With the illustrative case report, we include a literature review of diagnosis, prognostic factors, and treatment, with emphasis on surgical and radiation treatment of cervical metastatic disease from recurrent skin carcinomas. CASE PRESENTATION A xeroderma pigmentosum patient presented to our clinic with a 2-cm right submental and 1-cm right infra-auricular mass after resection of multiple squamous cell carcinomas of the scalp and face, and external-beam radiation therapy to the right face and neck. Fine-needle aspiration biopsy of the submental mass revealed poorly differentiated squamous cell carcinoma. The patient was brought to the operating room for a right modified radical neck dissection and excision of the right submental and intraparotid mass. Surgical pathology revealed 3 level ia and supraclavicular lymph nodes that were positive for metastatic squamous cell carcinoma. Re-irradiation to the entire right hemi-neck and left submandibular nodal region was performed using opposed oblique portals for the upper neck and a low anterior en face hemi-neck portal. The left parotid region was also included in the re-irradiation volume. Treatment was completed without delayed complications or recurrences to date. CONCLUSIONS To our knowledge, this is the first case report in the literature of a patient with xeroderma pigmentosum who subsequently developed metastatic disease from recurrent cutaneous squamous cell carcinoma. Because of the rarity of xeroderma pigmentosum, this case report is also the first to describe re-irradiation to treat cervical and intraparotid metastatic disease in a xeroderma pigmentosum patient.
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Affiliation(s)
- C C Wei
- New York University School of Medicine, Department of Otolaryngology-Head and Neck Surgery, New York, NY, U.S.A
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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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Zhang Y, Rohde LH, Wu H. Involvement of nucleotide excision and mismatch repair mechanisms in double strand break repair. Curr Genomics 2011; 10:250-8. [PMID: 19949546 PMCID: PMC2709936 DOI: 10.2174/138920209788488544] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2009] [Revised: 03/28/2009] [Accepted: 03/30/2009] [Indexed: 11/25/2022] Open
Abstract
Living organisms are constantly threatened by environmental DNA-damaging agents, including UV and ionizing radiation (IR). Repair of various forms of DNA damage caused by IR is normally thought to follow lesion-specific repair pathways with distinct enzymatic machinery. DNA double strand break is one of the most serious kinds of damage induced by IR, which is repaired through double strand break (DSB) repair mechanisms, including homologous recombination (HR) and non-homologous end joining (NHEJ). However, recent studies have presented increasing evidence that various DNA repair pathways are not separated, but well interlinked. It has been suggested that non-DSB repair mechanisms, such as Nucleotide Excision Repair (NER), Mismatch Repair (MMR) and cell cycle regulation, are highly involved in DSB repairs. These findings revealed previously unrecognized roles of various non-DSB repair genes and indicated that a successful DSB repair requires both DSB repair mechanisms and non-DSB repair systems. One of our recent studies found that suppressed expression of non-DSB repair genes, such as XPA, RPA and MLH1, influenced the yield of IR induced micronuclei formation and/or chromosome aberrations, suggesting that these genes are highly involved in DSB repair and DSB-related cell cycle arrest, which reveals new roles for these gene products in the DNA repair network. In this review, we summarize current progress on the function of non-DSB repair-related proteins, especially those that participate in NER and MMR pathways, and their influence on DSB repair. In addition, we present our developing view that the DSB repair mechanisms are more complex and are regulated by not only the well known HR/NHEJ pathways, but also a systematically coordinated cellular network.
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Affiliation(s)
- Ye Zhang
- NASA Johnson Space Center, Houston, Texas 77058
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Granzotto A, Joubert A, Viau M, Devic C, Maalouf M, Thomas C, Vogin G, Malek K, Colin C, Balosso J, Foray N. Réponse individuelle aux radiations ionisantes : quel(s) test(s) prédictif(s) choisir ? C R Biol 2011; 334:140-57. [DOI: 10.1016/j.crvi.2010.12.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2010] [Revised: 12/28/2010] [Accepted: 12/29/2010] [Indexed: 12/27/2022]
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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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Nakazawa Y, Yamashita S, Lehmann AR, Ogi T. A semi-automated non-radioactive system for measuring recovery of RNA synthesis and unscheduled DNA synthesis using ethynyluracil derivatives. DNA Repair (Amst) 2010; 9:506-16. [PMID: 20171149 DOI: 10.1016/j.dnarep.2010.01.015] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2009] [Revised: 01/22/2010] [Accepted: 01/23/2010] [Indexed: 01/03/2023]
Abstract
Nucleotide excision repair (NER) removes the major UV-photolesions from cellular DNA. In humans, compromised NER activity is the cause of several photosensitive diseases, one of which is the skin-cancer predisposition disorder, xeroderma pigmentosum (XP). Two assays commonly used in measurement of NER activity are 'unscheduled DNA synthesis (UDS)', and 'recovery of RNA synthesis (RRS)', the latter being a specific measure of the transcription-coupled repair sub-pathway of NER. Both assays are key techniques for research in NER as well as in diagnoses of NER-related disorders. Until very recently, reliable methods for these assays involved measurements of incorporation of radio-labeled nucleosides. We have established non-radioactive procedures for determining UDS and RRS levels by incorporation of recently developed alkyne-conjugated nucleoside analogues, 5-ethynyl-2'-deoxyuridine (EdU) and 5-ethynyuridine (EU). EdU and EU are respectively used as alternatives for (3)H-thymidine in UDS and for (3)H-uridine in RRS. Based on these alkyne-nucleosides and an integrated image analyser, we have developed a semi-automated assay system for NER-activity. We demonstrate the utility of this system for NER-activity assessments of lymphoblastoid samples as well as primary fibroblasts. Potential use of the system for large-scale siRNA-screening for novel NER defects as well as for routine XP diagnosis are also considered.
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Affiliation(s)
- Yuka Nakazawa
- Department of Molecular Medicine, Atomic Bomb Disease Institute, Graduate School of Biomedical Sciences, Nagasaki University, 1-12-4, Sakamoto, Nagasaki 852-8523, Japan
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DNA damage induced by the anthracycline cosmomycin D in DNA repair-deficient cells. Cancer Chemother Pharmacol 2010; 65:989-94. [PMID: 20107801 DOI: 10.1007/s00280-010-1244-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2009] [Accepted: 01/09/2010] [Indexed: 10/19/2022]
Abstract
PURPOSE Anthracyclines have been widely used as antitumor agents, playing a crucial role in the successful treatment of many types of cancer, despite some side effects related to cardiotoxicity. New anthracyclines have been designed and tested, but the first ones discovered, doxorubicin and daunorubicin, continue to be the drugs of choice. Despite their extensive use in chemotherapy, little is known about the DNA repair mechanisms involved in the removal of lesions caused by anthracyclines. The anthracycline cosmomycin D is the main product isolated from Streptomyces olindensis, characterized by a peculiar pattern of glycosylation with two trisaccharide rings attached to the A ring of the tetrahydrotetracene. METHODS We assessed the induction of apoptosis (Sub-G1) by cosmomycin D in nucleotide excision repair-deficient fibroblasts (XP-A and XP-C) as well as the levels of DNA damage (alkaline comet assay). RESULTS Treatment of XP-A and XP-C cells with cosmomycin D resulted in apoptosis in a time-dependent manner, with highest apoptosis levels observed 96 h after treatment. The effects of cosmomycin D were equivalent to those obtained with doxorubicin. The broad caspase inhibitor Z-VAD-FMK strongly inhibited apoptosis in these cells, and DNA damage induced by cosmomycin D was confirmed by alkaline comet assay. CONCLUSIONS Cosmomycin D induced time-dependent apoptosis in nucleotide excision repair-deficient fibroblasts. Despite similar apoptosis levels, cosmomycin D caused considerably lower levels of DNA damage compared to doxorubicin. This may be related to differences in structure between cosmomycin D and doxorubicin.
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Limsirichaikul S, Niimi A, Fawcett H, Lehmann A, Yamashita S, Ogi T. A rapid non-radioactive technique for measurement of repair synthesis in primary human fibroblasts by incorporation of ethynyl deoxyuridine (EdU). Nucleic Acids Res 2009; 37:e31. [PMID: 19179371 PMCID: PMC2651789 DOI: 10.1093/nar/gkp023] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Xeroderma pigmentosum (XP) is an autosomal recessive genetic disorder. Afflicted patients show extreme sun-sensitivity and skin cancer predisposition. XP is in most cases associated with deficient nucleotide excision repair (NER), which is the process responsible for removing photolesions from DNA. Measuring NER activity by nucleotide incorporation into repair patches, termed 'unscheduled DNA synthesis (UDS)', is one of the most commonly used assays for XP-diagnosis and NER research. We have established a rapid and accurate procedure for measuring UDS by replacement of thymidine with 5-ethynyl-2'-deoxyuridine (EdU). EdU incorporated into repair patches can be directly conjugated to fluorescent azide derivatives, thereby obviating the need for either radiolabeled thymidine or denaturation and antibody detection of incorporated bromodeoxyuridine (BrdU). We demonstrate that the EdU incorporation assay is compatible with conventional techniques such as immunofluorescent staining and labeling of cells with micro-latex beads. Importantly, we can complete the entire UDS assay within half a day from preparation of the assay coverslips; this technique may prove useful as a method for XP diagnosis.
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Affiliation(s)
- Siripan Limsirichaikul
- Department of Molecular Medicine, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, 852-8523 Japan
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Xeroderma pigmentosum: a retrospective case series in Zimbabwe. J Oral Maxillofac Surg 2009; 67:22-31. [PMID: 19070744 DOI: 10.1016/j.joms.2007.09.026] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2007] [Revised: 07/24/2007] [Accepted: 09/05/2007] [Indexed: 11/23/2022]
Abstract
PURPOSE To present our experience with the clinical features and management of black African patients with xeroderma pigmentosum (XP). PATIENTS AND METHODS Twelve patients with XP were seen over a 25-year period, and were retrospectively reviewed for age, gender, clinical features, treatment, and follow-up. RESULTS There were 8 females and 4 males with an age range of 3 to 18 years. One patient, the longest survivor, was followed until death at 18 years. Nine patients had the severe form of XP and 3 had the mild form. All patients had early ocular involvement with photophobia and early blindness. Squamous cell carcinoma (SCC) was present on the skin, lip, and tongue in most patients. One patient had ocular surface SCC. There was marked skin photosensitivity. No history of consanguinity was noted in the parents of the patients. Surgery was the treatment modality of choice. Follow-up was poor. CONCLUSION XP is uncommon in our black population, and presents in the severe form with SCC as the malignant skin, lip, and tongue lesion. It is common in early childhood with severe photosensitivity, photophobia, and eventual blindness. Follow-up is difficult in our environment.
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Sarasin A. Progress and Prospects of Xeroderma Pigmentosum Therapy. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2008; 637:144-51. [DOI: 10.1007/978-0-387-09599-8_16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Place de la radiothérapie dans le traitement des tumeurs cutanées chez huit patients atteints de xeroderma pigmentosum. ONCOLOGIE 2008. [DOI: 10.1007/s10269-007-0738-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Arlett CF, Green MHL, Rogers PB, Lehmann AR, Plowman PN. Minimal ionizing radiation sensitivity in a large cohort of xeroderma pigmentosum fibroblasts. Br J Radiol 2008; 81:51-8. [PMID: 18079351 DOI: 10.1259/bjr/27072321] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
We have examined our ionizing radiation survival data for 33 xeroderma pigmentosum (XP) primary fibroblast lines and compared the data to that of 53 normal fibroblast lines, 7 Cockayne syndrome (CS) lines, 4 combined XP/CS lines and 8 ataxia-telangiectasia fibroblast lines. Although there are differences in radiosensitivity between cell lines within each class, we have no convincing evidence that XP lines as a group are more sensitive to ionizing radiation than the general population. However, because the XP phenotype may lead to premature ageing, especially of sun-exposed tissues, we would still advocate caution when XP patients come to radiotherapy. Our results confirm the extreme ionizing radiation hypersensitivity of ataxia-telangiectasia; they are also consistent with a tendency for slight hypersensitivity in CS, but not (necessarily) in combined XP/CS.
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Affiliation(s)
- C F Arlett
- Genome Damage and Stability Centre, University of Sussex, Falmer, Brighton, BN1 9RQ.
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Roudkenar MH, Li L, Baba T, Kuwahara Y, Nakagawa H, Wang L, Kasaoka S, Ohkubo Y, Ono K, Fukumoto M. Gene expression profiles in mouse liver cells after exposure to different types of radiation. JOURNAL OF RADIATION RESEARCH 2008; 49:29-40. [PMID: 18049034 DOI: 10.1269/jrr.07078] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The liver is one of the target organs of radiation-induced cancers by internal exposures. In order to elucidate radiation-induced liver cancers including Thorotrast, we present a new approach to investigate in vivo effects of internal exposure to alpha-particles. Adopting boron neutron capture, we separately irradiated Kupffer cells and endothelial cells in mouse liver in vivo and analyzed the changes in gene transcriptions by an oligonucleotide microarray. Differential expression was defined as more than 3-fold for up-regulation and less than 1/3 for under-regulation, compared with non-irradiated controls. Of 6,050 genes examined, 68 showed differential expression compared with non-irradiated mice. Real-time polymerase chain reaction validated the results of the microarray analysis. Exposure to alpha-particles and gamma-rays produced different patterns of altered gene expression. Gene expression profiles revealed that the liver was in an inflammatory state characterized by up-regulation of positive acute phase protein genes, irrespective of the target cells exposed to radiation. In comparison with chemical and biological hepatotoxicants, inductions of Metallothionein 1 and Hemopexin, and suppressions of cytochrome P450s are characteristic of radiation exposure. Anti-inflammatory treatment could be helpful for the prevention and protection of radiation-induced hepatic injury.
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Affiliation(s)
- Mehryar Habibi Roudkenar
- Department of Pathology, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan
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Charbonnier JB, Renaud E, Miron S, Le Du MH, Blouquit Y, Duchambon P, Christova P, Shosheva A, Rose T, Angulo JF, Craescu CT. Structural, Thermodynamic, and Cellular Characterization of Human Centrin 2 Interaction with Xeroderma Pigmentosum Group C Protein. J Mol Biol 2007; 373:1032-46. [PMID: 17897675 DOI: 10.1016/j.jmb.2007.08.046] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2007] [Revised: 08/17/2007] [Accepted: 08/20/2007] [Indexed: 11/25/2022]
Abstract
Human centrin 2 (HsCen2), an EF-hand calcium binding protein, plays a regulatory role in the DNA damage recognition during the first steps of the nucleotide excision repair. This biological action is mediated by the binding to a short fragment (N847-R863) from the C-terminal region of xeroderma pigmentosum group C (XPC) protein. This work presents a detailed structural and energetic characterization of the HsCen2/XPC interaction. Using a truncated form of HsCen2 we obtained a high resolution (1.8 A) X-ray structure of the complex with the peptide N847-R863 from XPC. Structural and thermodynamic analysis of the interface revealed the existence of both electrostatic and apolar inter-molecular interactions, but the binding energy is mainly determined by the burial of apolar bulky side-chains into the hydrophobic pocket of the HsCen2 C-terminal domain. Binding studies with various peptide variants showed that XPC residues W848 and L851 constitute the critical anchoring side-chains. This enabled us to define a minimal centrin binding peptide variant of five residues, which accounts for about 75% of the total free energy of interaction between the two proteins. Immunofluorescence imaging in HeLa cells demonstrated that HsCen2 binding to the integral XPC protein may be observed in living cells, and is determined by the same interface residues identified in the X-ray structure of the complex. Overexpression of XPC perturbs the cellular distribution of HsCen2, by inducing a translocation of centrin molecules from the cytoplasm to the nucleus. The present data confirm that the in vitro structural features of the centrin/XPC peptide complex are highly relevant to the cellular context.
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Affiliation(s)
- Jean-Baptiste Charbonnier
- Laboratoire de Biologie Structurale et Radiobiologie, iBiTec-S, CEA, Commissariat à l'Energie Atomique, 91191 Gif-sur-Yvette, France
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Miccoli L, Burr KLA, Hickenbotham P, Friedberg EC, Angulo JF, Dubrova YE. The combined effects of xeroderma pigmentosum C deficiency and mutagens on mutation rates in the mouse germ line. Cancer Res 2007; 67:4695-9. [PMID: 17510396 DOI: 10.1158/0008-5472.can-06-3844] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Spontaneous and induced mutation rates at two expanded simple tandem repeat (ESTR) loci were studied in the germ line of xeroderma pigmentosum group C (Xpc) knockout mice defective in global genome nucleotide excision repair. Spontaneous and radiation-induced mutation rates in homozygous Xpc(-/-) males were significantly higher than those in isogenic wild-type (Xpc(+/+)) and heterozygous (Xpc(+/-)) mice. In contrast, exposure to the monofunctional alkylating agent ethylnitrosourea resulted in similar increases in ESTR mutation rates across all genotypes. ESTR mutation spectra in the germ line of Xpc(-/-), Xpc(+/-) and Xpc(+/+) did not differ. Considering these data and the results of other publications, we propose that the Xpc-deficient mice possess a mutator phenotype in their germ line and somatic tissues that may significantly enhance carcinogenesis across multiple tissues.
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Affiliation(s)
- Laurent Miccoli
- Commissariat à l'Energie Atomique, Laboratoire de Génétique de la Radiosensibilité, Institut de Radiobiologie Cellulaire et Moléculaire, Direction des Sciences du Vivant, Fontenay aux Roses, France
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Despras E, Pfeiffer P, Salles B, Calsou P, Kuhfittig-Kulle S, Angulo JF, Biard DSF. Long-term XPC silencing reduces DNA double-strand break repair. Cancer Res 2007; 67:2526-34. [PMID: 17363570 DOI: 10.1158/0008-5472.can-06-3371] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
To study the relationships between different DNA repair pathways, we established a set of clones in which one specific DNA repair gene was silenced using long-term RNA interference in HeLa cell line. We focus here on genes involved in either nucleotide excision repair (XPA and XPC) or nonhomologous end joining (NHEJ; DNA-PKcs and XRCC4). As expected, XPA(KD) (knock down) and XPC(KD) cells were highly sensitive to UVC. DNA-PKcs(KD) and XRCC4(KD) cells presented an increased sensitivity to various inducers of double-strand breaks (DSBs) and a 70% to 80% reduction of in vitro NHEJ activity. Long-term silencing of XPC gene expression led to an increased sensitivity to etoposide, a topoisomerase II inhibitor that creates DSBs through the progression of DNA replication forks. XPC(KD) cells also showed intolerance toward acute gamma-ray irradiation. We showed that XPC(KD) cells exhibited an altered spectrum of NHEJ products with decreased levels of intramolecular joined products. Moreover, in both XPC(KD) and DNA-PKcs(KD) cells, XRCC4 and ligase IV proteins were mobilized on damaged nuclear structures at lower doses of DSB inducer. In XPC-proficient cells, XPC protein was released from nuclear structures after induction of DSBs. By contrast, silencing of XPA gene expression did not have any effect on sensitivity to DSB or NHEJ. Our results suggest that XPC deficiency, certainly in combination with other genetic defects, may contribute to impair DSB repair.
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Affiliation(s)
- Emmanuelle Despras
- Commissariat à l'Energie Atomique, Laboratoire de Génétique de la Radiosensibilité, Département de Radiobiologie et de Radiopathologie, Direction des Sciences du Vivant, Fontenay-aux-Roses, France.
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