1
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Sylvester DE, Chen Y, Grima N, Saletta F, Padhye B, Bennetts B, Wright D, Krivanek M, Graf N, Zhou L, Catchpoole D, Kirk J, Latchoumanin O, Qiao L, Ballinger M, Thomas D, Jamieson R, Dalla-Pozza L, Byrne JA. Rare germline variants in childhood cancer patients suspected of genetic predisposition to cancer. Genes Chromosomes Cancer 2021; 61:81-93. [PMID: 34687117 DOI: 10.1002/gcc.23006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 10/11/2021] [Accepted: 10/13/2021] [Indexed: 11/11/2022] Open
Abstract
Identification of cancer-predisposing germline variants in childhood cancer patients is important for therapeutic decisions, disease surveillance and risk assessment for patients, and potentially, also for family members. We investigated the spectrum and prevalence of pathogenic germline variants in selected childhood cancer patients with features suggestive of genetic predisposition to cancer. Germline DNA was subjected to exome sequencing to filter variants in 1048 genes of interest including 176 known cancer predisposition genes (CPGs). An enrichment burden analysis compared rare deleterious germline CPG variants in the patient cohort with those in a healthy aged control population. A subset of predicted deleterious variants in novel candidate CPGs was investigated further by examining matched tumor samples, and the functional impact of AXIN1 variants was analyzed in cultured cells. Twenty-two pathogenic/likely pathogenic (P/LP) germline variants detected in 13 CPGs were identified in 19 of 76 patients (25.0%). Unclear association with the diagnosed cancer types was observed in 11 of 19 patients carrying P/LP CPG variants. The burden of rare deleterious germline variants in autosomal dominant CPGs was significantly higher in study patients versus healthy aged controls. A novel AXIN1 frameshift variant (Ser321fs) may impact the regulation of β-catenin levels. Selection of childhood cancer patients for germline testing based on features suggestive of an underlying genetic predisposition could help to identify carriers of clinically relevant germline CPG variants, and streamline the integration of germline genomic testing in the pediatric oncology clinic.
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Affiliation(s)
- Dianne E Sylvester
- Molecular Oncology Laboratory, Children's Cancer Research Unit, Kids Research, The Children's Hospital at Westmead, Westmead, New South Wales, Australia.,Children's Hospital at Westmead Clinical School, Faculty of Medicine and Health, University of Sydney, The Children's Hospital at Westmead, Westmead, New South Wales, Australia
| | - Yuyan Chen
- Molecular Oncology Laboratory, Children's Cancer Research Unit, Kids Research, The Children's Hospital at Westmead, Westmead, New South Wales, Australia.,Children's Hospital at Westmead Clinical School, Faculty of Medicine and Health, University of Sydney, The Children's Hospital at Westmead, Westmead, New South Wales, Australia
| | - Natalie Grima
- Molecular Oncology Laboratory, Children's Cancer Research Unit, Kids Research, The Children's Hospital at Westmead, Westmead, New South Wales, Australia.,Children's Hospital at Westmead Clinical School, Faculty of Medicine and Health, University of Sydney, The Children's Hospital at Westmead, Westmead, New South Wales, Australia
| | - Federica Saletta
- Molecular Oncology Laboratory, Children's Cancer Research Unit, Kids Research, The Children's Hospital at Westmead, Westmead, New South Wales, Australia.,Children's Hospital at Westmead Clinical School, Faculty of Medicine and Health, University of Sydney, The Children's Hospital at Westmead, Westmead, New South Wales, Australia
| | - Bhavna Padhye
- The Cancer Centre for Children, The Children's Hospital at Westmead, Westmead, New South Wales, Australia
| | - Bruce Bennetts
- Sydney Genome Diagnostics, The Children's Hospital at Westmead, Westmead, New South Wales, Australia
| | - Dale Wright
- Sydney Genome Diagnostics, The Children's Hospital at Westmead, Westmead, New South Wales, Australia
| | - Michael Krivanek
- Histopathology Department, The Children's Hospital at Westmead, Westmead, New South Wales, Australia
| | - Nicole Graf
- Histopathology Department, The Children's Hospital at Westmead, Westmead, New South Wales, Australia
| | - Li Zhou
- Sydney Children's Tumour Bank Network, Children's Cancer Research Unit, Kids Research, The Children's Hospital at Westmead, Westmead, New South Wales, Australia
| | - Daniel Catchpoole
- Sydney Children's Tumour Bank Network, Children's Cancer Research Unit, Kids Research, The Children's Hospital at Westmead, Westmead, New South Wales, Australia
| | - Judy Kirk
- Familial Cancer Service, Westmead Hospital, Westmead Institute for Medical Research, University of Sydney, Westmead, New South Wales, Australia
| | - Olivier Latchoumanin
- Storr Liver Centre, Westmead Institute for Medical Research, University of Sydney & Westmead Hospital, Westmead, New South Wales, Australia
| | - Liang Qiao
- Storr Liver Centre, Westmead Institute for Medical Research, University of Sydney & Westmead Hospital, Westmead, New South Wales, Australia
| | - Mandy Ballinger
- The Kinghorn Cancer Centre & Genomic Cancer Medicine, Garvan Institute of Medical Research, Darlinghurst, New South Wales, Australia
| | - David Thomas
- The Kinghorn Cancer Centre & Genomic Cancer Medicine, Garvan Institute of Medical Research, Darlinghurst, New South Wales, Australia
| | - Robyn Jamieson
- Children's Hospital at Westmead Clinical School, Faculty of Medicine and Health, University of Sydney, The Children's Hospital at Westmead, Westmead, New South Wales, Australia.,Eye and Developmental Genetics Research Group, The Children's Hospital at Westmead and Children's Medical Research Institute, and Disciplines of Genetic Medicine, Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
| | - Luciano Dalla-Pozza
- The Cancer Centre for Children, The Children's Hospital at Westmead, Westmead, New South Wales, Australia
| | - Jennifer A Byrne
- Molecular Oncology Laboratory, Children's Cancer Research Unit, Kids Research, The Children's Hospital at Westmead, Westmead, New South Wales, Australia.,Children's Hospital at Westmead Clinical School, Faculty of Medicine and Health, University of Sydney, The Children's Hospital at Westmead, Westmead, New South Wales, Australia.,NSW Health Statewide Biobank, NSW Health Pathology, Camperdown, New South Wales, Australia
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2
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Barnard SGR, McCarron R, Mancuso M, De Stefano I, Pazzaglia S, Pawliczek D, Dalke C, Ainsbury EA. Radiation-induced DNA Damage and Repair in Lens Epithelial Cells of both Ptch1(+/-) and Ercc2(+/-) Mutated Mice. Radiat Res 2021; 197:36-42. [PMID: 33652474 DOI: 10.1667/rade-20-00264.1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 01/22/2021] [Indexed: 11/03/2022]
Abstract
Epidemiological studies suggest an increased incidence and risk of cataract after low-dose (<2 Gy) ionizing radiation exposures. However, the biological mechanism(s) of this process are not fully understood. DNA damage and repair are thought to have a contributing role in radiation-induced cataractogenesis. Recently we have reported an inverse dose-rate effect, as well as the low-dose response, of DNA damage and repair in lens epithelial cells (LECs). Here, we present further initial findings from two mutated strains (Ercc2+/- and Ptch1+/-) of mice, both reportedly susceptible to radiation-induced cataract, and their DNA damage and repair response to low-dose and low-dose-rate gamma rays. Our results support the hypothesis that the lens epithelium responds differently to radiation than other tissues, with reported radiation susceptibility to DNA damage not necessarily translating to the LECs. Genetic predisposition and strain(s) of mice have a significant role in radiation-induced cataract susceptibility.
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Affiliation(s)
- S G R Barnard
- Public Health England, Centre for Radiation, Chemical and Environmental Hazards, Chilton, Didcot, Oxon, United Kingdom.,Department of Biosciences, University of Durham, Mountjoy Science Site, Durham DH13LE, United Kingdom
| | - R McCarron
- Public Health England, Centre for Radiation, Chemical and Environmental Hazards, Chilton, Didcot, Oxon, United Kingdom
| | - M Mancuso
- Laboratory of Biomedical Technologies, Agenzia Nazionale per le Nuove Tecnologie, l'Energia e lo Sviluppo Economico Sostenibile (ENEA), Rome, Italy
| | - I De Stefano
- Laboratory of Biomedical Technologies, Agenzia Nazionale per le Nuove Tecnologie, l'Energia e lo Sviluppo Economico Sostenibile (ENEA), Rome, Italy
| | - S Pazzaglia
- Laboratory of Biomedical Technologies, Agenzia Nazionale per le Nuove Tecnologie, l'Energia e lo Sviluppo Economico Sostenibile (ENEA), Rome, Italy
| | - D Pawliczek
- Helmholtz Zentrum München GmbH - German Research Center for Environmental Health, Institute of Developmental Genetics, Neuherberg, Germany
| | - C Dalke
- Helmholtz Zentrum München GmbH - German Research Center for Environmental Health, Institute of Developmental Genetics, Neuherberg, Germany
| | - E A Ainsbury
- Public Health England, Centre for Radiation, Chemical and Environmental Hazards, Chilton, Didcot, Oxon, United Kingdom
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3
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Regulation of DNA Damage Response and Homologous Recombination Repair by microRNA in Human Cells Exposed to Ionizing Radiation. Cancers (Basel) 2020; 12:cancers12071838. [PMID: 32650508 PMCID: PMC7408912 DOI: 10.3390/cancers12071838] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 06/26/2020] [Accepted: 06/29/2020] [Indexed: 12/12/2022] Open
Abstract
Ionizing radiation may be of both artificial and natural origin and causes cellular damage in living organisms. Radioactive isotopes have been used significantly in cancer therapy for many years. The formation of DNA double-strand breaks (DSBs) is the most dangerous effect of ionizing radiation on the cellular level. After irradiation, cells activate a DNA damage response, the molecular path that determines the fate of the cell. As an important element of this, homologous recombination repair is a crucial pathway for the error-free repair of DNA lesions. All components of DNA damage response are regulated by specific microRNAs. MicroRNAs are single-stranded short noncoding RNAs of 20–25 nt in length. They are directly involved in the regulation of gene expression by repressing translation or by cleaving target mRNA. In the present review, we analyze the biological mechanisms by which miRNAs regulate cell response to ionizing radiation-induced double-stranded breaks with an emphasis on DNA repair by homologous recombination, and its main component, the RAD51 recombinase. On the other hand, we discuss the ability of DNA damage response proteins to launch particular miRNA expression and modulate the course of this process. A full understanding of cell response processes to radiation-induced DNA damage will allow us to develop new and more effective methods of ionizing radiation therapy for cancers, and may help to develop methods for preventing the harmful effects of ionizing radiation on healthy organisms.
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4
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Cancer risk from low dose radiation in Ptch1/ mice with inactive DNA repair systems: Therapeutic implications for medulloblastoma. DNA Repair (Amst) 2019; 74:70-79. [DOI: 10.1016/j.dnarep.2018.12.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 12/03/2018] [Accepted: 12/14/2018] [Indexed: 12/14/2022]
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5
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Targeting DNA double strand break repair with hyperthermia and DNA-PKcs inhibition to enhance the effect of radiation treatment. Oncotarget 2018; 7:65504-65513. [PMID: 27602767 PMCID: PMC5323171 DOI: 10.18632/oncotarget.11798] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Accepted: 08/24/2016] [Indexed: 12/28/2022] Open
Abstract
Radiotherapy is based on the induction of lethal DNA damage, primarily DNA double-strand breaks (DSB). Efficient DSB repair via Non-Homologous End Joining or Homologous Recombination can therefore undermine the efficacy of radiotherapy. By suppressing DNA-DSB repair with hyperthermia (HT) and DNA-PKcs inhibitor NU7441 (DNA-PKcsi), we aim to enhance the effect of radiation. The sensitizing effect of HT for 1 hour at 42°C and DNA-PKcsi [1 μM] to radiation treatment was investigated in cervical and breast cancer cells, primary breast cancer sphere cells (BCSCs) enriched for cancer stem cells, and in an in vivo human tumor model. A significant radio-enhancement effect was observed for all cell types when DNA-PKcsi and HT were applied separately, and when both were combined, HT and DNA-PKcsi enhanced radio-sensitivity to an even greater extent. Strikingly, combined treatment resulted in significantly lower survival rates, 2 to 2.5 fold increase in apoptosis, more residual DNA-DSB 6 h post treatment and a G2-phase arrest. In addition, tumor growth analysis in vivo showed significant reduction in tumor growth and elevated caspase-3 activity when radiation was combined with HT and DNA-PKcsi compared to radiation alone. Importantly, no toxic side effects of HT or DNA-PKcsi were found. In conclusion, inhibiting DNA-DSB repair using HT and DNA-PKcsi before radiotherapy leads to enhanced cytotoxicity in cancer cells. This effect was even noticed in the more radio-resistant BCSCs, which are clearly sensitized by combined treatment. Therefore, the addition of HT and DNA-PKcsi to conventional radiotherapy is promising and might contribute to more efficient tumor control and patient outcome.
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6
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Tanori M, Casciati A, Berardinelli F, Leonardi S, Pasquali E, Antonelli F, Tanno B, Giardullo P, Pannicelli A, Babini G, De Stefano I, Sgura A, Mancuso M, Saran A, Pazzaglia S. Synthetic lethal genetic interactions between Rad54 and PARP-1 in mouse development and oncogenesis. Oncotarget 2017; 8:100958-100974. [PMID: 29254138 PMCID: PMC5731848 DOI: 10.18632/oncotarget.10479] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Accepted: 06/26/2016] [Indexed: 12/27/2022] Open
Abstract
Mutations in DNA repair pathways are frequent in human cancers. Hence, gaining insights into the interaction of DNA repair genes is key to development of novel tumor-specific treatment strategies. In this study, we tested the functional relationship in development and oncogenesis between the homologous recombination (HR) factor Rad54 and Parp-1, a nuclear enzyme that plays a multifunctional role in DNA damage signaling and repair. We introduced single or combined Rad54 and Parp-1 inactivating germline mutations in Ptc1 heterozygous mice, a well-characterized model of medulloblastoma, the most common malignant pediatric brain tumor. Our study reveals that combined inactivation of Rad54 and Parp-1 causes a marked growth delay culminating in perinatallethality, providing for the first time evidence of synthetic lethal interactions between Rad54 and Parp-1 in vivo. Although the double mutation hampered investigation of Rad54 and Parp-1 interactions in cerebellum tumorigenesis, insights were gained by showing accumulation of endogenous DNA damage and increased apoptotic rate in granule cell precursors (GCPs). A network-based approach to detect differential expression of DNA repair genes in the cerebellum revealed perturbation of p53 signaling in Rad54-/-/Parp-1-/-/Ptc1+/-, and MEFs from combined Rad54/Parp-1 mutants showed p53/p21-dependent typical senescent features. These findings help elucidate the genetic interplay between Rad54 and Parp-1 by suggesting that p53/p21-mediated apoptosis and/or senescence may be involved in synthetic lethal interactions occurring during development and inhibition of tumor growth.
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Affiliation(s)
- Mirella Tanori
- Laboratory of Biomedical Technologies, Agenzia Nazionale per le Nuove Tecnologie, l’Energia e lo Sviluppo Economico Sostenibile (ENEA), CR-Casaccia, Rome, Italy
| | - Arianna Casciati
- Laboratory of Biomedical Technologies, Agenzia Nazionale per le Nuove Tecnologie, l’Energia e lo Sviluppo Economico Sostenibile (ENEA), CR-Casaccia, Rome, Italy
| | | | - Simona Leonardi
- Laboratory of Biomedical Technologies, Agenzia Nazionale per le Nuove Tecnologie, l’Energia e lo Sviluppo Economico Sostenibile (ENEA), CR-Casaccia, Rome, Italy
| | - Emanuela Pasquali
- Laboratory of Biomedical Technologies, Agenzia Nazionale per le Nuove Tecnologie, l’Energia e lo Sviluppo Economico Sostenibile (ENEA), CR-Casaccia, Rome, Italy
| | - Francesca Antonelli
- Laboratory of Biomedical Technologies, Agenzia Nazionale per le Nuove Tecnologie, l’Energia e lo Sviluppo Economico Sostenibile (ENEA), CR-Casaccia, Rome, Italy
| | - Barbara Tanno
- Laboratory of Biomedical Technologies, Agenzia Nazionale per le Nuove Tecnologie, l’Energia e lo Sviluppo Economico Sostenibile (ENEA), CR-Casaccia, Rome, Italy
| | - Paola Giardullo
- Department of Science, University Roma Tre, Rome, Italy
- Department of Radiation Physics, Università degli Studi Guglielmo Marconi, Rome, Italy
| | | | | | - Ilaria De Stefano
- Department of Radiation Physics, Università degli Studi Guglielmo Marconi, Rome, Italy
| | | | - Mariateresa Mancuso
- Laboratory of Biomedical Technologies, Agenzia Nazionale per le Nuove Tecnologie, l’Energia e lo Sviluppo Economico Sostenibile (ENEA), CR-Casaccia, Rome, Italy
| | - Anna Saran
- Laboratory of Biomedical Technologies, Agenzia Nazionale per le Nuove Tecnologie, l’Energia e lo Sviluppo Economico Sostenibile (ENEA), CR-Casaccia, Rome, Italy
| | - Simonetta Pazzaglia
- Laboratory of Biomedical Technologies, Agenzia Nazionale per le Nuove Tecnologie, l’Energia e lo Sviluppo Economico Sostenibile (ENEA), CR-Casaccia, Rome, Italy
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7
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Tsuruoka C, Blyth BJ, Morioka T, Kaminishi M, Shinagawa M, Shimada Y, Kakinuma S. Sensitive Detection of Radiation-Induced Medulloblastomas after Acute or Protracted Gamma-Ray Exposures in Ptch1 Heterozygous Mice Using a Radiation-Specific Molecular Signature. Radiat Res 2016; 186:407-414. [PMID: 27690174 DOI: 10.1667/rr14499.1] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Recently reported studies have led to a heightened awareness of the risks of cancer induced by diagnostic radiological imaging, and in particular, the risk of brain cancer after childhood CT scans. One feature of Ptch1+/- mice is their sensitivity to radiation-induced medulloblastomas (an embryonic cerebellar tumor) during a narrow window of time centered on the days around birth. Little is known about the dynamics of how dose protraction interacts with such narrow windows of sensitivity in individual tissues. Using medulloblastomas from irradiated Ptch1+/- mice with a hybrid C3H × C57BL/6 F1 genetic background, we previously showed that the alleles retained on chromosome 13 (which harbors the Ptch1 gene) reveal two major mechanisms of loss of the wild-type allele. The loss of parental alleles from the telomere extending up to or past the Ptch1 locus by recombination (spontaneous type) accounts for almost all medulloblastomas in nonirradiated mice, while tumors in irradiated mice often exhibited interstitial deletions, which start downstream of the wild-type Ptch1 and extend up varying lengths towards the centromere (radiation type). In this study, Ptch1+/- mice were exposed to an acute dose of either 100 or 500 mGy gamma rays in utero or postnatally, or the same radiation doses protracted over a four-day period, and were monitored for medulloblastoma development. The results showed dose- and age-dependent radiation-induced type tumors. Furthermore, the size of the radiation-induced deletion differed with the dose rate. The results of this work suggest that tumor latency may be related to the size of the deletion. In this study, 500 mGy exposure produced radiation-induced type tumors at all ages and dose rates, while 100 mGy exposure did not significantly produce radiation-induced type tumors. The radiation signature allows for unique mechanistic insight into the action of radiation to induce DNA lesions with known causal relationship to a specific tumor type, particularly for doses and dose rates that are relevant to both diagnostic and accidental radiological exposures.
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Affiliation(s)
- Chizuru Tsuruoka
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Benjamin J Blyth
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Takamitsu Morioka
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Mutsumi Kaminishi
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Mayumi Shinagawa
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Yoshiya Shimada
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Shizuko Kakinuma
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
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8
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Tanori M, Pasquali E, Leonardi S, Casciati A, Giardullo P, De Stefano I, Mancuso M, Saran A, Pazzaglia S. Developmental and oncogenic radiation effects on neural stem cells and their differentiating progeny in mouse cerebellum. Stem Cells 2014; 31:2506-16. [PMID: 23897709 DOI: 10.1002/stem.1485] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Revised: 06/07/2013] [Accepted: 07/01/2013] [Indexed: 02/06/2023]
Abstract
Neural stem cells are highly susceptible to radiogenic DNA damage, however, little is known about their mechanisms of DNA damage response (DDR) and the long-term consequences of genotoxic exposure. Patched1 heterozygous mice (Ptc1(+/-)) provide a powerful model of medulloblastoma (MB), a frequent pediatric tumor of the cerebellum. Irradiation of newborn Ptc1(+/-) mice dramatically increases the frequency and shortens the latency of MB. In this model, we investigated the mechanisms through which multipotent neural progenitors (NSCs) and fate-restricted progenitor cells (PCs) of the cerebellum respond to DNA damage induced by radiation, and the long-term developmental and oncogenic consequences. These responses were assessed in mice exposed to low (0.25 Gy) or high (3 Gy) radiation doses at embryonic day 13.5 (E13.5), when NSCs giving rise to the cerebellum are specified but the external granule layer (EGL) has not yet formed, or at E16.5, during the expansion of granule PCs to form the EGL. We found crucial differences in DDR and apoptosis between NSCs and fate-restricted PCs, including lack of p21 expression in NSCs. NSCs also appear to be resistant to oncogenesis from low-dose radiation exposure but more vulnerable at higher doses. In addition, the pathway to DNA repair and the pattern of oncogenic alterations were strongly dependent on age at exposure, highlighting a differentiation-stage specificity of DNA repair pathways in NSCs and PCs. These findings shed light on the mechanisms used by NSCs and PCs to maintain genome integrity during neurogenesis and may have important implications for radiation risk assessment and for development of targeted therapies against brain tumors.
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Affiliation(s)
- Mirella Tanori
- Laboratory of Radiation Biology and Biomedicine, Agenzia Nazionale per le Nuove Tecnologie, l'Energia e lo Sviluppo Economico Sostenibile (ENEA), CR-Casaccia, Rome, Italy
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9
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Been RA, Ross JA, Nagel CW, Hooten AJ, Langer EK, DeCoursin KJ, Marek CA, Janik CL, Linden MA, Reed RC, Schutten MM, Largaespada DA, Johnson KJ. Perigestational dietary folic acid deficiency protects against medulloblastoma formation in a mouse model of nevoid basal cell carcinoma syndrome. Nutr Cancer 2014; 65:857-65. [PMID: 23909730 DOI: 10.1080/01635581.2013.804940] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Hereditary nevoid basal cell carcinoma syndrome (NBCCS) is caused by PTCH1 gene mutations that result in diverse neoplasms including medulloblastoma (MB). Epidemiological studies report reduced pediatric brain tumor risks associated with maternal intake of prenatal vitamins containing folic acid (FA) and FA supplements specifically. We hypothesized that low maternal FA intake during the perigestational period would increase MB incidence in a transgenic NBCCS mouse model, which carries an autosomal dominant mutation in the Ptch1 gene. Female wild-type C57BL/6 mice (n = 126) were randomized to 1 of 3 diets with differing FA amounts: 0.3 mg/kg (low), 2.0 mg/kg (control), and 8.0 mg/kg (high) 1 mo prior to mating with Ptch1 (+/-) C57BL/6 males. Females were maintained on the diet until pup weaning; the pups were then aged for tumor development. Compared to the control group, offspring MB incidence was significantly lower in the low FA group (Hazard Ratio = 0.47; 95% confidence interval 0.27-0.80) at 1 yr. No significant difference in incidence was observed between the control and high FA groups. Low maternal perigestational FA levels may decrease MB incidence in mice genetically predisposed to tumor development. Our results could have implications for prenatal FA intake recommendations in the presence of cancer syndromes.
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Affiliation(s)
- Raha A Been
- Masonic Cancer Center and Brain Tumor Program, University of Minnesota, Minneapolis, Minnesota 55455, USA
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10
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Rousseau L, Etienne O, Roque T, Desmaze C, Haton C, Mouthon MA, Bernardino-Sgherri J, Essers J, Kanaar R, Boussin FD. In vivo importance of homologous recombination DNA repair for mouse neural stem and progenitor cells. PLoS One 2012; 7:e37194. [PMID: 22666344 PMCID: PMC3362579 DOI: 10.1371/journal.pone.0037194] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2012] [Accepted: 04/18/2012] [Indexed: 01/15/2023] Open
Abstract
We characterized the in vivo importance of the homologous recombination factor RAD54 for the developing mouse brain cortex in normal conditions or after ionizing radiation exposure. Contrary to numerous homologous recombination genes, Rad54 disruption did not impact the cortical development without exogenous stress, but it dramatically enhanced the radiation sensitivity of neural stem and progenitor cells. This resulted in the death of all cells irradiated during S or G2, whereas the viability of cells irradiated in G1 or G0 was not affected by Rad54 disruption. Apoptosis occurred after long arrests at intra-S and G2/M checkpoints. This concerned every type of neural stem and progenitor cells, showing that the importance of Rad54 for radiation response was linked to the cell cycle phase at the time of irradiation and not to the differentiation state. In the developing brain, RAD54-dependent homologous recombination appeared absolutely required for the repair of damages induced by ionizing radiation during S and G2 phases, but not for the repair of endogenous damages in normal conditions. Altogether our data support the existence of RAD54-dependent and -independent homologous recombination pathways.
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Affiliation(s)
- Laure Rousseau
- Laboratoire de Radiopathologie, SCSR, iRCM, DSV, CEA, Fontenay-aux-Roses, France
- U967, INSERM, Fontenay-aux-Roses, France
- UMR 967, Université Paris Diderot, Sorbonne Paris Cité, Fontenay-aux-Roses, France
- UMR 967, Université Paris Sud, Fontenay-aux-Roses, France
| | - Olivier Etienne
- Laboratoire de Radiopathologie, SCSR, iRCM, DSV, CEA, Fontenay-aux-Roses, France
- U967, INSERM, Fontenay-aux-Roses, France
- UMR 967, Université Paris Diderot, Sorbonne Paris Cité, Fontenay-aux-Roses, France
- UMR 967, Université Paris Sud, Fontenay-aux-Roses, France
| | - Telma Roque
- Laboratoire de Radiopathologie, SCSR, iRCM, DSV, CEA, Fontenay-aux-Roses, France
- U967, INSERM, Fontenay-aux-Roses, France
- UMR 967, Université Paris Diderot, Sorbonne Paris Cité, Fontenay-aux-Roses, France
- UMR 967, Université Paris Sud, Fontenay-aux-Roses, France
| | - Chantal Desmaze
- Laboratoire de Radiopathologie, SCSR, iRCM, DSV, CEA, Fontenay-aux-Roses, France
- U967, INSERM, Fontenay-aux-Roses, France
- UMR 967, Université Paris Diderot, Sorbonne Paris Cité, Fontenay-aux-Roses, France
- UMR 967, Université Paris Sud, Fontenay-aux-Roses, France
| | - Céline Haton
- Laboratoire de Radiopathologie, SCSR, iRCM, DSV, CEA, Fontenay-aux-Roses, France
- U967, INSERM, Fontenay-aux-Roses, France
- UMR 967, Université Paris Diderot, Sorbonne Paris Cité, Fontenay-aux-Roses, France
- UMR 967, Université Paris Sud, Fontenay-aux-Roses, France
| | - Marc-André Mouthon
- Laboratoire de Radiopathologie, SCSR, iRCM, DSV, CEA, Fontenay-aux-Roses, France
- U967, INSERM, Fontenay-aux-Roses, France
- UMR 967, Université Paris Diderot, Sorbonne Paris Cité, Fontenay-aux-Roses, France
- UMR 967, Université Paris Sud, Fontenay-aux-Roses, France
| | - Jacqueline Bernardino-Sgherri
- U967, INSERM, Fontenay-aux-Roses, France
- UMR 967, Université Paris Diderot, Sorbonne Paris Cité, Fontenay-aux-Roses, France
- UMR 967, Université Paris Sud, Fontenay-aux-Roses, France
- Laboratoire de Gamétogenèse, Apoptose et Génotoxicité, SCSR, iRCM, DSV, CEA, Fontenay-aux-Roses, France
| | - Jeroen Essers
- Department of Cell Biology & Genetics, Cancer Genomics Center, Erasmus MC, Rotterdam, The Netherlands
- Department of Radiation Oncology, Erasmus MC, Rotterdam, The Netherlands
- Department of Vascular Surgery, Erasmus MC, Rotterdam, The Netherlands
| | - Roland Kanaar
- Department of Cell Biology & Genetics, Cancer Genomics Center, Erasmus MC, Rotterdam, The Netherlands
- Department of Radiation Oncology, Erasmus MC, Rotterdam, The Netherlands
| | - François D. Boussin
- Laboratoire de Radiopathologie, SCSR, iRCM, DSV, CEA, Fontenay-aux-Roses, France
- U967, INSERM, Fontenay-aux-Roses, France
- UMR 967, Université Paris Diderot, Sorbonne Paris Cité, Fontenay-aux-Roses, France
- UMR 967, Université Paris Sud, Fontenay-aux-Roses, France
- * E-mail:
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