1
|
Petroni M, La Monica V, Fabretti F, Augusto M, Battaglini D, Polonara F, Di Giulio S, Giannini G. The Multiple Faces of the MRN Complex: Roles in Medulloblastoma and Beyond. Cancers (Basel) 2023; 15:3599. [PMID: 37509263 PMCID: PMC10377613 DOI: 10.3390/cancers15143599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 07/09/2023] [Accepted: 07/10/2023] [Indexed: 07/30/2023] Open
Abstract
Hypomorphic mutations in MRN complex genes are frequently found in cancer, supporting their role as oncosuppressors. However, unlike canonical oncosuppressors, MRN proteins are often overexpressed in tumor tissues, where they actively work to counteract DSBs induced by both oncogene-dependent RS and radio-chemotherapy. Moreover, at the same time, MRN genes are also essential genes, since the constitutive KO of each component leads to embryonic lethality. Therefore, even though it is paradoxical, MRN genes may work as oncosuppressive, oncopromoting, and essential genes. In this review, we discussed how alterations in the MRN complex impact the physiopathology of cancer, in light of our recent discoveries on the gene-dosage-dependent effect of NBS1 in Medulloblastoma. These updates aim to understand whether MRN complex can be realistically used as a prognostic/predictive marker and/or as a therapeutic target for the treatment of cancer patients in the future.
Collapse
Affiliation(s)
- Marialaura Petroni
- Department of Molecular Medicine, University La Sapienza, 00161 Rome, Italy
- Istituto Pasteur-Fondazione Cenci Bolognetti, 00161 Rome, Italy
| | - Veronica La Monica
- Department of Molecular Medicine, University La Sapienza, 00161 Rome, Italy
| | - Francesca Fabretti
- Department of Molecular Medicine, University La Sapienza, 00161 Rome, Italy
| | - Mariaconcetta Augusto
- Department of Molecular Medicine, University La Sapienza, 00161 Rome, Italy
- Center for Life Nano- & Neuro-Science, Istituto Italiano di Tecnologia (IIT), 00161 Rome, Italy
| | - Damiana Battaglini
- Department of Molecular Medicine, University La Sapienza, 00161 Rome, Italy
| | - Francesca Polonara
- Department of Molecular Medicine, University La Sapienza, 00161 Rome, Italy
- Istituto Pasteur-Fondazione Cenci Bolognetti, 00161 Rome, Italy
| | - Stefano Di Giulio
- Department of Molecular Medicine, University La Sapienza, 00161 Rome, Italy
| | - Giuseppe Giannini
- Department of Molecular Medicine, University La Sapienza, 00161 Rome, Italy
- Istituto Pasteur-Fondazione Cenci Bolognetti, 00161 Rome, Italy
| |
Collapse
|
2
|
Hill RM, Plasschaert SLA, Timmermann B, Dufour C, Aquilina K, Avula S, Donovan L, Lequin M, Pietsch T, Thomale U, Tippelt S, Wesseling P, Rutkowski S, Clifford SC, Pfister SM, Bailey S, Fleischhack G. Relapsed Medulloblastoma in Pre-Irradiated Patients: Current Practice for Diagnostics and Treatment. Cancers (Basel) 2021; 14:126. [PMID: 35008290 PMCID: PMC8750207 DOI: 10.3390/cancers14010126] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 12/23/2021] [Accepted: 12/24/2021] [Indexed: 02/07/2023] Open
Abstract
Relapsed medulloblastoma (rMB) accounts for a considerable, and disproportionate amount of childhood cancer deaths. Recent advances have gone someway to characterising disease biology at relapse including second malignancies that often cannot be distinguished from relapse on imaging alone. Furthermore, there are now multiple international early-phase trials exploring drug-target matches across a range of high-risk/relapsed paediatric tumours. Despite these advances, treatment at relapse in pre-irradiated patients is typically non-curative and focuses on providing life-prolonging and symptom-modifying care that is tailored to the needs and wishes of the individual and their family. Here, we describe the current understanding of prognostic factors at disease relapse such as principal molecular group, adverse molecular biology, and timing of relapse. We provide an overview of the clinical diagnostic process including signs and symptoms, staging investigations, and molecular pathology, followed by a summary of treatment modalities and considerations. Finally, we summarise future directions to progress understanding of treatment resistance and the biological mechanisms underpinning early therapy-refractory and relapsed disease. These initiatives include development of comprehensive and collaborative molecular profiling approaches at relapse, liquid biopsies such as cerebrospinal fluid (CSF) as a biomarker of minimal residual disease (MRD), modelling strategies, and the use of primary tumour material for real-time drug screening approaches.
Collapse
Affiliation(s)
- Rebecca M. Hill
- Wolfson Childhood Cancer Research Centre, Newcastle University Centre for Cancer, Newcastle upon Tyne NE1 7RU, UK; (S.C.C.); (S.B.)
| | - Sabine L. A. Plasschaert
- Princess Máxima Center for Pediatric Oncology, 3584 CS Utrecht, The Netherlands; (S.L.A.P.); (M.L.); (P.W.)
| | - Beate Timmermann
- Department of Particle Therapy, West German Proton Therapy Centre Essen (WPE), West German Cancer Center (WTZ), University Hospital Essen, 45147 Essen, Germany;
| | - Christelle Dufour
- Department of Pediatric and Adolescent Oncology, Gustave Roussy, 94800 Villejuif, France;
| | - Kristian Aquilina
- Department of Neurosurgery, Great Ormond Street Hospital, London WC1N 3JH, UK;
| | - Shivaram Avula
- Department of Radiology, Alder Hey Children’s NHS Foundation Trust, Liverpool L12 2AP, UK;
| | - Laura Donovan
- UCL Great Ormond Street Institute of Child Health, London WC1N 1EH, UK;
| | - Maarten Lequin
- Princess Máxima Center for Pediatric Oncology, 3584 CS Utrecht, The Netherlands; (S.L.A.P.); (M.L.); (P.W.)
| | - Torsten Pietsch
- Institute of Neuropathology, DGNN Brain Tumor Reference Center, University of Bonn, 53127 Bonn, Germany;
| | - Ulrich Thomale
- Department of Neurosurgery, Charité-Universitätsmedizin Berlin, 13353 Berlin, Germany;
| | - Stephan Tippelt
- Department of Pediatrics III, Center for Translational Neuro- and Behavioral Sciences (CTNBS), University Hospital of Essen, 45147 Essen, Germany;
| | - Pieter Wesseling
- Princess Máxima Center for Pediatric Oncology, 3584 CS Utrecht, The Netherlands; (S.L.A.P.); (M.L.); (P.W.)
- Department of Pathology, Amsterdam University Medical Centers/VUmc, 1081 HV Amsterdam, The Netherlands
| | - Stefan Rutkowski
- Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany;
| | - Steven C. Clifford
- Wolfson Childhood Cancer Research Centre, Newcastle University Centre for Cancer, Newcastle upon Tyne NE1 7RU, UK; (S.C.C.); (S.B.)
| | - Stefan M. Pfister
- Hopp Children’s Cancer Center Heidelberg (KiTZ), 69120 Heidelberg, Germany;
- Division of Pediatric Neurooncology, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
- Department of Pediatric Oncology and Hematology, Heidelberg University Hospital, 69120 Heidelberg, Germany
| | - Simon Bailey
- Wolfson Childhood Cancer Research Centre, Newcastle University Centre for Cancer, Newcastle upon Tyne NE1 7RU, UK; (S.C.C.); (S.B.)
| | - Gudrun Fleischhack
- Department of Pediatrics III, Center for Translational Neuro- and Behavioral Sciences (CTNBS), University Hospital of Essen, 45147 Essen, Germany;
| |
Collapse
|
3
|
A Survey of Reported Disease-Related Mutations in the MRE11-RAD50-NBS1 Complex. Cells 2020; 9:cells9071678. [PMID: 32668560 PMCID: PMC7407228 DOI: 10.3390/cells9071678] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 07/01/2020] [Accepted: 07/06/2020] [Indexed: 12/24/2022] Open
Abstract
The MRE11-RAD50-NBS1 (MRN) protein complex is one of the primary vehicles for repairing DNA double strand breaks and maintaining the genomic stability within the cell. The role of the MRN complex to recognize and process DNA double-strand breaks as well as signal other damage response factors is critical for maintaining proper cellular function. Mutations in any one of the components of the MRN complex that effect function or expression of the repair machinery could be detrimental to the cell and may initiate and/or propagate disease. Here, we discuss, in a structural and biochemical context, mutations in each of the three MRN components that have been associated with diseases such as ataxia telangiectasia-like disorder (ATLD), Nijmegen breakage syndrome (NBS), NBS-like disorder (NBSLD) and certain types of cancers. Overall, deepening our understanding of disease-causing mutations of the MRN complex at the structural and biochemical level is foundational to the future aim of treating diseases associated with these aberrations.
Collapse
|
4
|
Dou R, Zhang L, Lu T, Liu D, Mei F, Huang J, Qian L. Identification of a novel HRAS variant and its association with papillary thyroid carcinoma. Oncol Lett 2018; 15:4511-4516. [PMID: 29556290 DOI: 10.3892/ol.2018.7818] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Accepted: 12/11/2017] [Indexed: 12/27/2022] Open
Abstract
HRas proto-oncogene (HRAS) is one of the most commonly mutated genes in thyroid cancer, with mutations frequently occurring in the follicular and Hurthle cell subtypes. However, the contribution of mutations in HRAS to papillary thyroid carcinoma (PTC) progression and the tall-cell variant (TCV) is poorly understood. The aim of the present study was to investigate the somatic genetic variants present in HRAS in patients with PTC, and to investigate the association of these mutations with PTC. The present study is a retrospective case-control study using tumor samples collected from 139 patients with PTC and blood samples from 195 healthy individuals. All patient samples were screened for mutations in 'hotspot' regions of HRAS and B-raf proto-oncogene (BRAF) by single-stranded conformational polymorphism analysis, followed by direct sequencing. A novel variant (IVS1-82del gctgggcctggg) in the HRAS 5'-untranslated region was identified. There was no difference in age or sex of patients with PTC and the healthy controls; however, the HRAS variant was more frequently detected in PTC tissue than in the healthy control samples (37 vs. 26%, P=0.04). There was no association between the HRAS variant and age, sex, tumor size, encapsulation, multifocality/intra-thyroidal spread, Tumor-Node-Metastasis stage, history of Hashimoto's disease, BRAF V600E mutation or PTC subtype (all P>0.05). There were differences of BRAF V600E distribution among different subtypes (χ2=6.390, P=0.041). HRAS variant co-occurring with the BRAF V600E mutation accounted for 31.6% of the total number (P=0.196). Therefore, this novel variant of HRAS (IVS1-82del gctgggcctggg) may be associated with PTC; however, larger scale studies are required to assess the contribution of this novel HRAS variant to PTC progression.
Collapse
Affiliation(s)
- Rui Dou
- Department of Ultrasound, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, P.R. China.,Department of Ultrasound, The Second Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia Autonomous Region 010030, P.R. China
| | - Lili Zhang
- Department of Ultrasound, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, P.R. China
| | - Tingxia Lu
- Experimental Center, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, P.R. China
| | - Dong Liu
- Department of Ultrasound, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, P.R. China
| | - Fang Mei
- Department of Pathology, Peking University Third Hospital, Beijing 100191, P.R. China
| | - Jian Huang
- Experimental Center, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, P.R. China
| | - Linxue Qian
- Department of Ultrasound, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, P.R. China
| |
Collapse
|
5
|
Trubicka J, Żemojtel T, Hecht J, Falana K, Piekutowska- Abramczuk D, Płoski R, Perek-Polnik M, Drogosiewicz M, Grajkowska W, Ciara E, Moszczyńska E, Dembowska-Bagińska B, Perek D, Chrzanowska KH, Krajewska-Walasek M, Łastowska M. The germline variants in DNA repair genes in pediatric medulloblastoma: a challenge for current therapeutic strategies. BMC Cancer 2017; 17:239. [PMID: 28376765 PMCID: PMC5379555 DOI: 10.1186/s12885-017-3211-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Accepted: 03/22/2017] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND The defects in DNA repair genes are potentially linked to development and response to therapy in medulloblastoma. Therefore the purpose of this study was to establish the spectrum and frequency of germline variants in selected DNA repair genes and their impact on response to chemotherapy in medulloblastoma patients. METHODS The following genes were investigated in 102 paediatric patients: MSH2 and RAD50 using targeted gene panel sequencing and NBN variants (p.I171V and p.K219fs*19) by Sanger sequencing. In three patients with presence of rare life-threatening adverse events (AE) and no detected variants in the analyzed genes, whole exome sequencing was performed. Based on combination of molecular and immunohistochemical evaluations tumors were divided into molecular subgroups. Presence of variants was tested for potential association with the occurrence of rare life-threatening AE and other clinical features. RESULTS We have identified altogether six new potentially pathogenic variants in MSH2 (p.A733T and p.V606I), RAD50 (p.R1093*), FANCM (p.L694*), ERCC2 (p.R695C) and EXO1 (p.V738L), in addition to two known NBN variants. Five out of twelve patients with defects in either of MSH2, RAD50 and NBN genes suffered from rare life-threatening AE, more frequently than in control group (p = 0.0005). When all detected variants were taken into account, the majority of patients (8 out of 15) suffered from life-threatening toxicity during chemotherapy. CONCLUSION Our results, based on the largest systematic study performed in a clinical setting, provide preliminary evidence for a link between defects in DNA repair genes and treatment related toxicity in children with medulloblastoma. The data suggest that patients with DNA repair gene variants could need special vigilance during and after courses of chemotherapy.
Collapse
Affiliation(s)
- Joanna Trubicka
- Department of Medical Genetics, The Children’s Memorial Health Institute, Al. Dzieci Polskich 20, 04-730 Warsaw, Poland
- Department of Pathology, The Children’s Memorial Health Institute, Al. Dzieci Polskich 20, 04-730 Warsaw, Poland
| | - Tomasz Żemojtel
- Institute for Medical Genetics and Human Genetics, Charité Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, 60-569 Poznan, Poland
| | - Jochen Hecht
- Max Planck Institute for Molecular Genetics, Ihnestr. 63-73, 14195 Berlin, Germany
- Berlin-Brandenburg Center for Regenerative Therapies, Charité Universitätsmedizin Berlin, 13353 Berlin, Germany
| | - Katarzyna Falana
- Department of Medical Genetics, The Children’s Memorial Health Institute, Al. Dzieci Polskich 20, 04-730 Warsaw, Poland
| | - Dorota Piekutowska- Abramczuk
- Department of Medical Genetics, The Children’s Memorial Health Institute, Al. Dzieci Polskich 20, 04-730 Warsaw, Poland
| | - Rafał Płoski
- Department of Medical Genetics, Warsaw Medical University, Warsaw, Poland
| | - Marta Perek-Polnik
- Department of Oncology, The Children’s Memorial Health Institute, Al. Dzieci Polskich 20, 04-730 Warsaw, Poland
| | - Monika Drogosiewicz
- Department of Oncology, The Children’s Memorial Health Institute, Al. Dzieci Polskich 20, 04-730 Warsaw, Poland
| | - Wiesława Grajkowska
- Department of Pathology, The Children’s Memorial Health Institute, Al. Dzieci Polskich 20, 04-730 Warsaw, Poland
- Department of Experimental and Clinical Pathology, Mossakowski Medical Research Centre Polish Academy of Sciences, A. Pawińskiego 5, 02-106 Warsaw, Poland
| | - Elżbieta Ciara
- Department of Medical Genetics, The Children’s Memorial Health Institute, Al. Dzieci Polskich 20, 04-730 Warsaw, Poland
| | - Elżbieta Moszczyńska
- Department of Endocrinology and Diabetology, The Children’s Memorial Health Institute, Al. Dzieci Polskich 20, 04-730 Warsaw, Poland
| | - Bożenna Dembowska-Bagińska
- Department of Oncology, The Children’s Memorial Health Institute, Al. Dzieci Polskich 20, 04-730 Warsaw, Poland
| | - Danuta Perek
- Department of Oncology, The Children’s Memorial Health Institute, Al. Dzieci Polskich 20, 04-730 Warsaw, Poland
| | - Krystyna H. Chrzanowska
- Department of Medical Genetics, The Children’s Memorial Health Institute, Al. Dzieci Polskich 20, 04-730 Warsaw, Poland
| | - Małgorzata Krajewska-Walasek
- Department of Medical Genetics, The Children’s Memorial Health Institute, Al. Dzieci Polskich 20, 04-730 Warsaw, Poland
| | - Maria Łastowska
- Department of Pathology, The Children’s Memorial Health Institute, Al. Dzieci Polskich 20, 04-730 Warsaw, Poland
- Department of Experimental and Clinical Pathology, Mossakowski Medical Research Centre Polish Academy of Sciences, A. Pawińskiego 5, 02-106 Warsaw, Poland
| |
Collapse
|
6
|
Wang H, Dharmalingam P, Vasquez V, Mitra J, Boldogh I, Rao KS, Kent TA, Mitra S, Hegde ML. Chronic oxidative damage together with genome repair deficiency in the neurons is a double whammy for neurodegeneration: Is damage response signaling a potential therapeutic target? Mech Ageing Dev 2016; 161:163-176. [PMID: 27663141 DOI: 10.1016/j.mad.2016.09.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 09/13/2016] [Accepted: 09/19/2016] [Indexed: 12/14/2022]
Abstract
A foremost challenge for the neurons, which are among the most oxygenated cells, is the genome damage caused by chronic exposure to endogenous reactive oxygen species (ROS), formed as cellular respiratory byproducts. Strong metabolic activity associated with high transcriptional levels in these long lived post-mitotic cells render them vulnerable to oxidative genome damage, including DNA strand breaks and mutagenic base lesions. There is growing evidence for the accumulation of unrepaired DNA lesions in the central nervous system (CNS) during accelerated aging and progressive neurodegeneration. Several germ line mutations in DNA repair or DNA damage response (DDR) signaling genes are uniquely manifested in the phenotype of neuronal dysfunction and are etiologically linked to many neurodegenerative disorders. Studies in our lab and elsewhere revealed that pro-oxidant metals, ROS and misfolded amyloidogenic proteins not only contribute to genome damage in CNS, but also impede their repair/DDR signaling leading to persistent damage accumulation, a common feature in sporadic neurodegeneration. Here, we have reviewed recent advances in our understanding of the etiological implications of DNA damage vs. repair imbalance, abnormal DDR signaling in triggering neurodegeneration and potential of DDR as a target for the amelioration of neurodegenerative diseases.
Collapse
Affiliation(s)
- Haibo Wang
- Department of Radiation Oncology, Houston Methodist Research Institute, Houston, TX 77030, USA; Houston Methodist Neurological Institute, Houston, TX 77030, USA
| | - Prakash Dharmalingam
- Department of Radiation Oncology, Houston Methodist Research Institute, Houston, TX 77030, USA; Houston Methodist Neurological Institute, Houston, TX 77030, USA
| | - Velmarini Vasquez
- Department of Radiation Oncology, Houston Methodist Research Institute, Houston, TX 77030, USA; Centre for Neuroscience, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), City of Knowledge, Panama City, Panama; Department of Biotechnology, Acharya Nagarjuna University, Guntur, AP, India; Houston Methodist Neurological Institute, Houston, TX 77030, USA
| | - Joy Mitra
- Department of Radiation Oncology, Houston Methodist Research Institute, Houston, TX 77030, USA; Houston Methodist Neurological Institute, Houston, TX 77030, USA
| | - Istvan Boldogh
- Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, TX 77555, USA
| | - K S Rao
- Centre for Neuroscience, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), City of Knowledge, Panama City, Panama
| | - Thomas A Kent
- Department of Neurology, Baylor College of Medicine and Center for Translational Research on Inflammatory Diseases Michael E. DeBakey Veterans Affairs Medical Center, Houston, TX 77030, USA
| | - Sankar Mitra
- Department of Radiation Oncology, Houston Methodist Research Institute, Houston, TX 77030, USA; Weill Medical College of Cornell University, New York, USA
| | - Muralidhar L Hegde
- Department of Radiation Oncology, Houston Methodist Research Institute, Houston, TX 77030, USA; Houston Methodist Neurological Institute, Houston, TX 77030, USA; Weill Medical College of Cornell University, New York, USA.
| |
Collapse
|
7
|
Zhang L, Jia Z, Mao F, Shi Y, Bu RF, Zhang B. Whole-exome sequencing identifies a somatic missense mutation of NBN in clear cell sarcoma of the salivary gland. Oncol Rep 2016; 35:3349-56. [PMID: 27109316 DOI: 10.3892/or.2016.4738] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2015] [Accepted: 01/15/2016] [Indexed: 01/09/2023] Open
Abstract
Clear cell sarcoma (CCS) is a rare, low-grade carcinoma commonly located in the distal extremities of young adults involving tendons and aponeuroses. CCS is characterized by its poor prognosis due to late diagnosis, multiple local recurrence, propensity to late metastases, and a high rate of tumor-related mortality. The genetic cause for CCS is thought to be EWSR1 gene translocation. However, CCS lacking a translocation may have other, as yet uncharacterized, genetic mutations that can cause the same pathological effect. A combination of whole‑exome sequencing and Sanger sequencing of cancer tissue and venous blood from a patient diagnosed with CCS of the salivary gland revealed a somatic missense mutation, c.1061C>T (p.P354L), in exon 9 of the Nibrin gene (NBN). This somatic missense mutation led to the conversion of proline to leucine (p.P354L), resulting in deleterious effects for the NBN protein. Multiple-sequence alignments showed that codon 354, where the mutation (c.1061C>T) occurs, is located within a phylogenetically conserved region. In conclusion, we here report a somatic missense mutation c.1061C>T (p.P354L) in the NBN gene in a patient with CCS lacking an EWSR1-ATF1 fusion. Our findings broaden the genotypic spectrum of CCS and provide new molecular insight that should prove useful in the future clinical genetic diagnosis of CCS.
Collapse
Affiliation(s)
- Lei Zhang
- Department of Stomatology, Chinese PLA General Hospital, Beijing 100853, P.R. China
| | - Zhen Jia
- Department of Stomatology, Beijing Aviation General Hospital, Beijing 100012, P.R. China
| | - Fengbiao Mao
- Beijing Institutes of Life Science, Chinese Academy of Sciences, Beijing 100101, P.R. China
| | - Yueyi Shi
- Department of Stomatology, Chinese PLA General Hospital, Beijing 100853, P.R. China
| | - Rong Fa Bu
- Department of Stomatology, Chinese PLA General Hospital, Beijing 100853, P.R. China
| | - Baorong Zhang
- Department of Stomatology, Beijing Aviation General Hospital, Beijing 100012, P.R. China
| |
Collapse
|
8
|
Zhao Z, Chen GY, Long J, Li H, Huang J. Genomic losses at 5q13.2 and 8p23.1 in dysplastic hepatocytes are common events in hepatitis B virus-related hepatocellular carcinoma. Oncol Lett 2015; 9:2839-2846. [PMID: 26137157 DOI: 10.3892/ol.2015.3140] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2014] [Accepted: 03/24/2015] [Indexed: 12/30/2022] Open
Abstract
Chromosomal loci with genomic imbalances are frequently identified in hepatocellular carcinoma (HCC). Greater than two-thirds of hepatitis B virus (HBV)-related HCCs originate from liver cirrhosis following a duration of up to two decades. However, it is unclear whether these genomic imbalances occur and accumulate in dysplastic hepatocytes of the cirrhotic liver during the progression from regenerated nodules to preneoplastic lesions, including dysplastic nodules (DN). In the present study, high-grade DNs (HGDNs) of HBV-related liver cirrhosis were screened to identify loci with genomic imbalances, and the frequency of the identified loci in a group of HCCs was analyzed in order to determine whether there may be a genetic link between liver cirrhosis and HCC. Genomic DNA was extracted from six HGDNs of two cases of HBV-related liver cirrhosis and subjected to array comparative genomic hybridization (CGH) analysis with a NimbleGen 720K microarray. Loci with the most frequently observed genomic imbalances in DNs were further analyzed in 83 cases of HCC by differential polymerase chain reaction (PCR) and quantitative PCR. The array CGH analysis revealed that the majority of genomic imbalances in the HGDNs were genomic losses of small segments, with loss of heterozygosity (LOH) at 5q13.2 and 8p23.1 identified most frequently. Of the 83 HCC cases, 30 (36.1%) cases were identified with LOH at 5q13.2, where known tumor-associated genes are located, including general transcription factor IIH subunit 2 (GTF2H2), baculoviral IAP repeat-containing protein 1 (BIRC1) and occludin (OCLN). LOH frequency at 8p23.1 in HCC was 61.29% (D8S1130) and 68.4% (D8S503) respectively, similar to the results obtained in previous studies. In conclusion, the results of the present study provided evidence that genomic losses at 5q13.2 and 8p23.1 identified in dysplastic hepatocytes of the cirrhotic liver are common events in HCC. HCC-associated chromosomal abnormalities may occur and accumulate in preneoplastic lesions of liver cirrhosis.
Collapse
Affiliation(s)
- Zhang Zhao
- Liver Research Center, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, P.R. China
| | - Guang-Yong Chen
- Department of Pathology, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, P.R. China
| | - Jiang Long
- Minimally Invasive Hepatobiliary Cancer Center, Beijing You-An Hospital, Capital Medical University, Beijing 100069, P.R. China
| | - Hai Li
- Department of Hepatopancreatobiliary and Splenic Medicine, Affiliated Hospital of Medical College of Chinese People's Armed Police Force, Tianjin 300192, P.R. China
| | - Jian Huang
- Liver Research Center, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, P.R. China ; Beijing Key Laboratory of Traditional Medicine in Liver Cirrhosis, National Clinical Research Center of Digestive Disease, Beijing 100050, P.R. China
| |
Collapse
|
9
|
Wang Y, Li M, Long J, Shi XY, Li Q, Chen J, Tong WM, Jia JD, Huang J. Clinical significance of increased expression of Nijmegen breakage syndrome gene (NBS1) in human primary liver cancer. Hepatol Int 2014. [PMID: 26202506 DOI: 10.1007/s12072-013-9500-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
PURPOSE As a DNA repair-associated gene essential for maintaining genomic instability, Nijmegen breakage syndrome gene (NBS1), codes for a protein, Nbs1(p95/Nibrin), involved in the processing/repair of DNA double-strand breaks. The aim of this study is to investigate the molecular alteration of Nbs1 in human primary liver cancer, including HBV-associated hepatocellular carcinoma (HCC) and intrahepatic cholangiocarcinoma (ICC). METHODS The expression levels of Nbs1 in 110 cases of primary liver cancer, including 85 HCCs and 25 ICCs, were detected by immunohistochemistry, real-time RT-PCR and Western blot analysis. The percentage of Ki-67 antigen-positive cells and the level of phosphorylated histone H2AX (γ-H2AX) were detected to evaluate the relationship of Nbs1 expression with proliferation and the degree of DNA damage in HCC cells. RESULTS Increased Nbs1 expression was observed in tumor compared to corresponding adjacent non-tumor tissue in 54.6 and 47.3 % of HCC cases detected with frozen tissues and paraffin sections. Higher frequency of increased Nbs1 expression was shown in poorly differentiated HCCs (p = 0.0265) and in all poorly differentiated ICCs, indicating the increased Nbs1 expression is associated with the degree of malignancy of HCC cells. Moreover, the percentage of Ki-67-positive cells and the level of γ-H2AX correlate well with increased Nbs1 expression in HCC cases, suggesting an activated DNA damage response in proliferating HCC cells with increased Nbs1 expression. CONCLUSION Increased Nbs1 expression might play a significant role in liver cancer progression, and the status of Nbs1 expression might be helpful for evaluation of the degree of malignancy of primary liver cancer.
Collapse
Affiliation(s)
- Yan Wang
- Liver Research Center, Beijing Friendship Hospital, Capital Medical University, 95 Yong An Road, Beijing, 100050, China
| | - Man Li
- Department of Pathology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Jiang Long
- Minimally Invasive Hepatobiliary Cancer Center, Beijing You-An Hospital, Capital Medical University, Beijing, China
| | - Xiao-Yan Shi
- Department of Pathology, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Qian Li
- Department of Oncological Science, Mount Sinai School of Medicine, New York, NY, USA
| | - Jia Chen
- Department of Oncological Science, Mount Sinai School of Medicine, New York, NY, USA
| | - Wei-Min Tong
- Department of Pathology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Ji-Dong Jia
- Liver Research Center, Beijing Friendship Hospital, Capital Medical University, 95 Yong An Road, Beijing, 100050, China.
| | - Jian Huang
- Liver Research Center, Beijing Friendship Hospital, Capital Medical University, 95 Yong An Road, Beijing, 100050, China.
| |
Collapse
|
10
|
Wang Y, Hong Y, Li M, Long J, Zhao YP, Zhang JX, Li Q, You H, Tong WM, Jia JD, Huang J. Mutation inactivation of Nijmegen breakage syndrome gene (NBS1) in hepatocellular carcinoma and intrahepatic cholangiocarcinoma. PLoS One 2013; 8:e82426. [PMID: 24349281 PMCID: PMC3862623 DOI: 10.1371/journal.pone.0082426] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Accepted: 11/04/2013] [Indexed: 11/25/2022] Open
Abstract
Nijmegen breakage syndrome (NBS) with NBS1 germ-line mutation is a human autosomal recessive disease characterized by genomic instability and enhanced cancer predisposition. The NBS1 gene codes for a protein, Nbs1(p95/Nibrin), involved in the processing/repair of DNA double-strand breaks. Hepatocellular carcinoma (HCC) is a complex and heterogeneous tumor with several genomic alterations. Recent studies have shown that heterozygous NBS1 mice exhibited a higher incidence of HCC than did wild-type mice. The objective of the present study is to assess whether NBS1 mutations play a role in the pathogenesis of human primary liver cancer, including HBV-associated HCC and intrahepatic cholangiocarcinoma (ICC). Eight missense NBS1 mutations were identified in six of 64 (9.4%) HCCs and two of 18 (11.1%) ICCs, whereas only one synonymous mutation was found in 89 control cases of cirrhosis and chronic hepatitis B. Analysis of the functional consequences of the identified NBS1 mutations in Mre11-binding domain showed loss of nuclear localization of Nbs1 partner Mre11, one of the hallmarks for Nbs1 deficiency, in one HCC and two ICCs with NBS1 mutations. Moreover, seven of the eight tumors with NBS1 mutations had at least one genetic alteration in the TP53 pathway, including TP53 mutation, MDM2 amplification, p14ARF homozygous deletion and promoter methylation, implying a synergistic effect of Nbs1 disruption and p53 inactivation. Our findings provide novel insight on the molecular pathogenesis of primary liver cancer characterized by mutation inactivation of NBS1, a DNA repair associated gene.
Collapse
Affiliation(s)
- Yan Wang
- Liver Research Center, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Yu Hong
- Liver Research Center, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Man Li
- Department of Pathology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Jiang Long
- Minimally Invasive Hepatobiliary Cancer Center, Beijing You-An Hospital, Capital Medical University, Beijing, China
| | - Yan-Ping Zhao
- Liver Research Center, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Jun-Xia Zhang
- Department of Hepatology, Tianjin Infectious Disease Specialty Hospital, Tianjin, China
| | - Qian Li
- Department of Preventive Medicine, Mt. Sinai School of Medicine, New York, New York, United States of America
| | - Hong You
- Liver Research Center, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Wei-Min Tong
- Department of Pathology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Ji-Dong Jia
- Liver Research Center, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Jian Huang
- Liver Research Center, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| |
Collapse
|
11
|
Berardinelli F, di Masi A, Antoccia A. NBN Gene Polymorphisms and Cancer Susceptibility: A Systemic Review. Curr Genomics 2013; 14:425-40. [PMID: 24396275 PMCID: PMC3867719 DOI: 10.2174/13892029113146660012] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2013] [Revised: 08/30/2013] [Accepted: 09/02/2013] [Indexed: 01/07/2023] Open
Abstract
The relationship between DNA repair failure and cancer is well established as in the case of rare, high penetrant genes in high cancer risk families. Beside this, in the last two decades, several studies have investigated a possible association between low penetrant polymorphic variants in genes devoted to DNA repair pathways and risk for developing cancer. This relationship would be also supported by the observation that DNA repair processes may be modulated by sequence variants in DNA repair genes, leading to susceptibility to environmental carcinogens. In this framework, the aim of this review is to provide the reader with the state of the art on the association between common genetic variants and cancer risk, limiting the attention to single nucleotide polymorphisms (SNPs) of the NBN gene and providing the various odd ratios (ORs). In this respect, the NBN protein, together with MRE11 and RAD50, is part of the MRN complex which is a central player in the very early steps of sensing and processing of DNA double-strand breaks (DSBs), in telomere maintenance, in cell cycle control, and in genomic integrity in general. So far, many papers were devoted to ascertain possible association between common synonymous and non-synonymous NBN gene polymorphisms and increased cancer risk. However, the results still remain inconsistent and inconclusive also in meta-analysis studies for the most investigated E185Q NBN miscoding variant.
Collapse
|
12
|
Gao P, Ma N, Li M, Tian QB, Liu DW. Functional variants in NBS1 and cancer risk: evidence from a meta-analysis of 60 publications with 111 individual studies. Mutagenesis 2013; 28:683-97. [PMID: 24113799 DOI: 10.1093/mutage/get048] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Several potentially functional variants of Nijmegen breakage syndrome 1 (NBS1) have been implicated in cancer risk, but individually studies showed inconclusive results. In this study, a meta-analysis based on 60 publications with a total of 39 731 cancer cases and 64 957 controls was performed. The multivariate method and the model-free method were adopted to determine the best genetic model. It was found that rs2735383 variant genotypes were associated with significantly increased overall risk of cancer under the recessive genetic model [odds ratio (OR) =1.12, 95% confidence interval (CI): 1.02-1.22, P = 0.013]. Similar results were found for rs1063054 under the dominant model effect (OR = 1.12, 95% CI: 1.01-1.23, P = 0.024). The I171V mutation, 657del5 mutation and R215W mutation also contribute to the development of cancer (for I171V, OR = 3.93, 95% CI: 1.68-9.20, P = 0.002; for 657del5, OR = 2.79, 95% CI: 2.17-3.68, P < 0.001; for R215W, OR = 1.77, 95% CI: 1.07-2.91, P = 0.025). From stratification analyses, an effect modification of cancer risks was found in the subgroups of tumour site and ethnicity for rs2735383, whereas the I171V, 657del5 and R215W showed a deleterious effect of cancer susceptibility in the subgroups of tumour site. However, rs1805794, D95N and P266L did not appear to have an effect on cancer risk. These results suggest that rs2735383, rs1063054, I171V, 657del5 and R215W are low-penetrance risk factors for cancer development.
Collapse
Affiliation(s)
- Ping Gao
- Department of Social Medicine and
| | | | | | | | | |
Collapse
|
13
|
Zhang G, Zeng Y, Liu Z, Wei W. Significant association between Nijmegen breakage syndrome 1 657del5 polymorphism and breast cancer risk. Tumour Biol 2013; 34:2753-7. [PMID: 23765759 DOI: 10.1007/s13277-013-0830-z] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2013] [Accepted: 04/29/2013] [Indexed: 11/30/2022] Open
Abstract
Many studies were published to evaluate the association between Nijmegen breakage syndrome 1 (NBS1) 657del5 polymorphism and breast cancer risk, but the results remained inconsistent. To derive a more precise estimation on the possible association, we performed a meta-analysis of previous published studies. Case-control studies on the association between NBS1 657del5 polymorphisms and breast cancer risk were included into this meta-analysis. We used the odds ratio (OR) with 95 % confidence interval (95 % CI) to assess the strength of the association. Ten studies with a total of 25,365 subjects were identified and included into this meta-analysis. Meta-analysis of those ten studies showed that there was a significant association between NBS1 657del5 polymorphisms and breast cancer risk (pooled OR = 2.66, 95 % CI 1.82-3.90, P < 0.001). The cumulative meta-analyses showed a trend of a more significant association between NBS1 657del5 polymorphisms and breast cancer risk as data accumulated by publication year. Thus, our meta-analysis suggests that there was a significant association between NBS1 657del5 polymorphisms and breast cancer risk, and NBS1 657del5 polymorphism results in an increased risk of breast cancer.
Collapse
Affiliation(s)
- Guofeng Zhang
- Department of General Surgery, Tongji Hospital, Tongji University School of Medicine, Shanghai, 200065, China,
| | | | | | | |
Collapse
|
14
|
Long J, Wang Y, Li M, Tong WM, Jia JD, Huang J. Correlation of TP53 mutations with HCV positivity in hepatocarcinogenesis: identification of a novel TP53 microindel in hepatocellular carcinoma with HCV infection. Oncol Rep 2013; 30:119-24. [PMID: 23624687 DOI: 10.3892/or.2013.2430] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2012] [Accepted: 03/05/2013] [Indexed: 01/27/2023] Open
Abstract
Although it is known that chronic hepatitis C virus (HCV) infection may contribute to tumor initiation and development, the molecular processes causing hepatocellular carcinoma (HCC) remain unclear. Microindels are unique, infrequent mutations that result in inserted and deleted sequences at the same nucleotide position, and are important contributors to cancer. To date, microindels in the p53 tumor suppressor gene (TP53) have not been fully examined in tumors. In the present study, 116 cases of HCC were screened for mutations in the TP53 gene (exon 5-8) by single-stranded conformational polymorphism analysis followed by direct sequencing. A special type of complex TP53 mutation, 616ins14del1 (14-1 microindel), was identified in a case of HCC with HCV infection. This rare TP53 microindel led to the generation of a truncated protein of 211 amino acids that lacked the DNA-binding domain and tetramerization domain. Immunohistochemistry showed loss of p53 protein expression and downregulation of p21(WAF/CIP), Mdm2 and Bax in the tumor cells, indicating an impaired p53 signaling pathway. Nineteen of the 116 (16.4%) HCCs carried a total of 19 TP53 mutations. Notably, 5 of the 13 HCV-positive (38.5%) cases contained a TP53 mutation, and there was a significant association between TP53 mutations and HCV positivity (P=0.0379). No correlation of TP53 mutations with hepatitis B virus (HBV) positivity was observed. In summary, we identified a novel TP53 microindel in HCC, and provided evidence of HCC characterized by HCV infections typically associated with mutational inactivation of the TP53 gene.
Collapse
Affiliation(s)
- Jiang Long
- Liver Research Center, Beijing Friendship Hospital, Capital Medical University, Beijing, P.R. China
| | | | | | | | | | | |
Collapse
|
15
|
Association of Single Nucleotide Polymorphisms of NBS1 Gene With Genetic Susceptibility to Primary Liver Cancer in a Chinese Han Population*. PROG BIOCHEM BIOPHYS 2012. [DOI: 10.3724/sp.j.1206.2011.00536] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
16
|
Abstract
NBN gene is considered as one of the low-to-moderate cancer susceptibility gene. At least 4 germline NBN mutations have been found in several malignancies in adults. In our studies, we observed the high incidence of germline mutation I171V of NBN gene in breast, colorectal, larynx cancer, and in multiple primary tumors. In this study, we would like to answer the question whether I171V germline mutation of NBN gene may constitute risk factor for solid tumors in children. The frequency of this mutation has been analyzed in patients with neuroblastoma (n=66), Wilms tumor (n=54), medulloblastoma (n=57), and rhabdomyosarcoma (n=82) hospitalized in Pediatric Oncology, Hematology and Bone Marrow Transplantation Department in the years between 1987 and 2010. About 2947 anonymous blood samples collected on Guthrie cards drawn from the newborn screening program of the Wielkopolska region have been used as controls. All the patients and controls came from the same geographical region. I171V mutation of the NBN gene has been observed in 5 controls. Among children with solid tumors only in 1 child with medulloblastoma I171V variant has been found. In conclusion, I171V germline mutation in contrary to adults cannot be considered as a risk factor for children malignancies. However, owing to low number of patients with solid tumors the possibility of a Type II error may exist.
Collapse
|
17
|
Eich M, Roos WP, Dianov GL, Digweed M, Kaina B. Nijmegen breakage syndrome protein (NBN) causes resistance to methylating anticancer drugs such as temozolomide. Mol Pharmacol 2010; 78:943-51. [PMID: 20729302 DOI: 10.1124/mol.110.066076] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Methylating agents are first-line therapeutics for gliomas and malignant melanomas. They attack DNA at various sites, and both O(6)-methylguanine and N-methylated base adducts contribute to the killing response. The mechanism of cellular defense against these agents primarily involves O(6)-methylguanine-DNA methyltransferase (MGMT) and base excision repair (BER). Here, we determined whether a key protein involved in DNA double-strand break (DSB) recognition and signaling, nibrin (NBN alias NBS-1), plays a role in the cellular defense against methylating agents. Comparing NBN mutated fibroblasts and lymphoblastoid cells from patients suffering from Nijmegen breakage syndrome, we show that NBN mutants are clearly more sensitive to N-methyl-N'-nitro-N-nitrosoguanidine and temozolomide than the corresponding wild-type cells. Hypersensitivity was due to the induction of both apoptosis and necrosis. The mismatch repair proteins MSH2, MSH6, MLH1, and PMS2 were expressed at a similar level in the cell lines and BER was not affected by NBN mutation. Because MGMT expression abrogated the hypersensitivity of NBN mutated cells, we conclude that O(6)-methylguanine-derived lesions are responsible for triggering the response. Down-regulation of NBN in melanoma cells by small interfering RNA rendered them more sensitive to temozolomide, suggesting that NBN is a novel modulator of temozolomide sensitivity. Because NBN is part of the MRN complex, which recognizes DSBs, the data strongly indicate that MRN is critically involved in DSB processing after O(6)-methylguanine induction. The data provide first evidence that NBN is involved in the cellular defense against O(6)-methylguanine-inducing agents such as temozolomide and identify NBN as a critical target of methylating anticancer drug resistance.
Collapse
Affiliation(s)
- Marcus Eich
- Institute of Toxicology, Medical Center of the University Mainz, Obere Zahlbacher Str 67, D-55131 Mainz, Germany
| | | | | | | | | |
Collapse
|
18
|
Ciara E, Piekutowska-Abramczuk D, Popowska E, Grajkowska W, Barszcz S, Perek D, Dembowska-Bagińska B, Perek-Polnik M, Kowalewska E, Czajńska A, Syczewska M, Czornak K, Krajewska-Walasek M, Roszkowski M, Chrzanowska KH. Heterozygous germ-line mutations in the NBN gene predispose to medulloblastoma in pediatric patients. Acta Neuropathol 2010; 119:325-34. [PMID: 19908051 DOI: 10.1007/s00401-009-0608-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2009] [Revised: 10/30/2009] [Accepted: 10/31/2009] [Indexed: 01/23/2023]
Abstract
The NBN (NBS1) gene belongs to a group of double-strand break repair genes. Mutations in any of these genes cause genome instability syndromes and contribute to carcinogenesis. NBN gene mutations cause increased tumor risk in Nijmegen breakage syndrome (NBS) homozygotes as well as in NBN heterozygotes. NBS patients develop different types of malignancies; among solid tumors, medulloblastoma (MB), an embryonal tumor of the cerebellum, has been reported most frequently. The majority of medulloblastomas occur sporadically, some of them manifest within familial cancer syndromes. Several signaling pathways are known to be engaged in hereditary and sporadic MB. The aim of our study was to identify mutations in selected exons of the NBN gene and to determine the frequency of the most common NBN gene mutations in pediatric patients with different types of medulloblastoma. We screened a total of 104 patients with MB and identified 7 heterozygous carriers (6.7%) of two different germ-line mutations of NBN gene; all of them had classic MB. Our results indicate that heterozygous carriers of the germ-line NBN gene mutations (c.511A>G and c.657_661del5) may exhibit increased susceptibility to developing MB. The risk of medulloblastoma is estimated to be 3.0 (for c.511A>G) and 4.86 (for c.657_661del5) times higher than in the general Polish population (p<0.05). These results suggest that heterozygous NBN germ-line mutations may contribute to the etiology of medulloblastoma.
Collapse
Affiliation(s)
- Elżbieta Ciara
- Department of Medical Genetics, The Children's Memorial Health Institute, Al. Dzieci Polskich 20, 04-730, Warsaw, Poland
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Lloyd J, Chapman JR, Clapperton JA, Haire LF, Hartsuiker E, Li J, Carr AM, Jackson SP, Smerdon SJ. A supramodular FHA/BRCT-repeat architecture mediates Nbs1 adaptor function in response to DNA damage. Cell 2009; 139:100-11. [PMID: 19804756 PMCID: PMC2900601 DOI: 10.1016/j.cell.2009.07.043] [Citation(s) in RCA: 123] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2009] [Revised: 06/08/2009] [Accepted: 07/22/2009] [Indexed: 10/20/2022]
Abstract
The Mre11/Rad50/Nbs1 protein complex plays central enzymatic and signaling roles in the DNA-damage response. Nuclease (Mre11) and scaffolding (Rad50) components of MRN have been extensively characterized, but the molecular basis of Nbs1 function has remained elusive. Here, we present a 2.3A crystal structure of the N-terminal region of fission yeast Nbs1, revealing an unusual but conserved architecture in which the FHA- and BRCT-repeat domains structurally coalesce. We demonstrate that diphosphorylated pSer-Asp-pThr-Asp motifs, recently identified as multicopy docking sites within Mdc1, are evolutionarily conserved Nbs1 binding targets. Furthermore, we show that similar phosphomotifs within Ctp1, the fission yeast ortholog of human CtIP, promote interactions with the Nbs1 FHA domain that are necessary for Ctp1-dependent resistance to DNA damage. Finally, we establish that human Nbs1 interactions with Mdc1 occur through both its FHA- and BRCT-repeat domains, suggesting how their structural and functional interdependence underpins Nbs1 adaptor functions in the DNA-damage response.
Collapse
Affiliation(s)
- Janette Lloyd
- MRC National Institute for Medical Research, Division of Molecular Structure, The Ridgeway, Mill Hill, London NW7 1AA, UK
| | - J. Ross Chapman
- The Gurdon Institute and Department of Zoology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QN, UK
| | - Julie A. Clapperton
- MRC National Institute for Medical Research, Division of Molecular Structure, The Ridgeway, Mill Hill, London NW7 1AA, UK
| | - Lesley F. Haire
- MRC National Institute for Medical Research, Division of Molecular Structure, The Ridgeway, Mill Hill, London NW7 1AA, UK
| | - Edgar Hartsuiker
- Genome Damage and Stability Centre, University of Sussex, Brighton BN1 9RQ, UK
| | - Jiejin Li
- MRC National Institute for Medical Research, Division of Molecular Structure, The Ridgeway, Mill Hill, London NW7 1AA, UK
| | - Antony M. Carr
- Genome Damage and Stability Centre, University of Sussex, Brighton BN1 9RQ, UK
| | - Stephen P. Jackson
- The Gurdon Institute and Department of Zoology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QN, UK
| | - Stephen J. Smerdon
- MRC National Institute for Medical Research, Division of Molecular Structure, The Ridgeway, Mill Hill, London NW7 1AA, UK
| |
Collapse
|
20
|
Mutational inactivation of the nijmegen breakage syndrome gene (NBS1) in glioblastomas is associated with multiple TP53 mutations. J Neuropathol Exp Neurol 2009; 68:210-5. [PMID: 19151620 DOI: 10.1097/nen.0b013e31819724c2] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Nijmegen breakage syndrome caused by NBS1 germline mutations is a rare autosomal recessive disease with clinical features that include microcephaly, increased radiosensitivity, and predisposition to cancer. NBS1 plays a key role in DNA double-strand break repair and the maintenance of genomic stability. We screened 87 glioblastomas for NBS1 mutations (all 16 exons). Single-strand conformation polymorphism followed by direct DNA sequencing revealed 12 NBS1 mutations (8 missense and 4 intronic mutations) in 9 (32%) of 28 primary (de novo) glioblastomas carrying 2 or more TP53 mutations. None of the NBS1 mutations has been previously reported as a germline mutation in Nijmegen breakage syndrome patients. NBS1 mutations were not detected in 19 primary glioblastomas with 1 TP53 mutation or in 21 primary glioblastomas without TP53 mutations. Secondary glioblastomas that developed through progression from low-grade or anaplastic astrocytoma had TP53 mutations in 16 (84%) of 19 cases, but none contained mutations of the NBS1 gene. These results suggest that multiple TP53 mutations in glioblastomas are due to deficient repair of DNA double-strand breaks caused by mutational inactivation of the NBS1 gene.
Collapse
|
21
|
Huang J, Pang J, Watanabe T, Ng HK, Ohgaki H. Whole genome amplification for array comparative genomic hybridization using DNA extracted from formalin-fixed, paraffin-embedded histological sections. J Mol Diagn 2009; 11:109-16. [PMID: 19197000 DOI: 10.2353/jmoldx.2009.080143] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Array comparative genomic hybridization (CGH) is useful to assess genome-wide chromosomal imbalance, but the requirement for relatively large amounts of DNA can be a limitation, in particular for samples extracted from small tumor areas on paraffin sections. Whole genome amplification (WGA) can be performed before array CGH to obtain sufficient DNA, but the possibility of artifacts attributable to biased amplification cannot be excluded. We optimized the WGA protocol to generate sufficient DNA with minimum amplification bias. Using formalin-fixed, paraffin-embedded histological sections of tumors carrying known TP53 mutations, LOH 1p, LOH 10q, LOH 19q, and EGFR amplification, we first optimized the protocol so that these genetic alterations were detected after WGA. We found that a ligation step before WGA is important because it allows a short reaction time with Phi29 to generate WGA-DNA with greatly decreased amplification bias. Using template >150 ng of DNA, a ligation step before WGA, and a short reaction time with Phi29 DNA polymerase (<1.5 hours), we obtained WGA-DNA (>4 mug) with minimum amplification bias (less than threefold). Using this protocol, we performed array CGH (Agilent 105K) before and after WGA. Pearson correlation analysis indicated a significant positive correlation in array CGH results between DNA before and after WGA (P < 0.0001). These results suggest that genetic analyses are possible using WGA-DNA extracted from paraffin sections, but that they should be performed with a carefully optimized and controlled protocol.
Collapse
Affiliation(s)
- Jian Huang
- International Agency for Research on Cancer, Lyon, France
| | | | | | | | | |
Collapse
|
22
|
Recurrent genomic alterations characterize medulloblastoma arising from DNA double-strand break repair deficiency. Proc Natl Acad Sci U S A 2009; 106:1880-5. [PMID: 19164512 DOI: 10.1073/pnas.0806882106] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Inactivation of homologous recombination (HR) or nonhomologous end-joining (NHEJ) predisposes to a spectrum of tumor types. Here, we inactivated DNA double-strand break repair (DSBR) proteins, DNA Ligase IV (Lig4), Xrcc2, and Brca2, or combined Lig4/Xrcc2 during neural development using Nestin-cre. In all cases, inactivation of these repair factors, together with p53 loss, led to rapid medulloblastoma formation. Genomic analysis of these tumors showed recurring chromosome 13 alterations via chromosomal loss or translocations involving regions containing Ptch1. Sequence analysis of the remaining Ptch1 allele showed a variety of inactivating mutations in all tumors analyzed, highlighting the critical tumor suppressor function of this hedgehog-signaling regulator. We also observed genomic amplification or up-regulation of either N-Myc or cyclin D2 in all medulloblastomas. Additionally, chromosome 19, which contains Pten, was also selectively deleted in medulloblastoma arising after disruption of HR. Thus, our data highlight the preeminence of Ptch1 as a tumor suppressor in cerebellar granule cells and reveal other genomic events central to the genesis of medulloblastoma.
Collapse
|