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Jiang T, Zhang Y, Yu S, Hu B. Discovering potential WRN inhibitors from natural product database through computational methods. J Mol Graph Model 2024; 129:108758. [PMID: 38507856 DOI: 10.1016/j.jmgm.2024.108758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Revised: 02/29/2024] [Accepted: 03/10/2024] [Indexed: 03/22/2024]
Abstract
Microsatellite instability (MSI) is a relatively common feature associated with multiple cancers, and Werner syndrome (WRN) ATP-dependent helicase has been recognized as a novel target for treating MSI cancers, such as colorectal cancer. A small-molecule inhibitor targeting WRN would be a promising strategy for treating colorectal cancer with high MSI expression. In this study, we employed a computer-assisted drug discovery strategy to screen over 30,000 natural product molecules. By using a combination of docking, ligand efficiency, Molecular Mechanics/Generalized Born Surface Area (MM/GBSA), and thermodynamic integration (TI) calculations, we identified MOL008980, MOL010740, MOL011832, T4743, TN1166, and TNP-002173 as potential WRN inhibitors. Subsequent molecular dynamics simulation revealed that these screened natural products possessed better binding dynamic characteristics than ATP substrate and were capable of inhibiting the dynamic process of WRN, making them potential strong ATP competitive inhibitors. In conclusion, our computational approach revealed potential WRN inhibitors from a natural product database, providing a theoretical basis for future research.
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Affiliation(s)
| | | | - Shuihong Yu
- College of Pharmacy, Anqing Medical College, Anqing, China
| | - Bingde Hu
- Navy Anqing Hospital, Anqing, China.
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Yoon JH, Sellamuthu K, Prakash L, Prakash S. WRN exonuclease imparts high fidelity on translesion synthesis by Y family DNA polymerases. Genes Dev 2024; 38:213-232. [PMID: 38503516 DOI: 10.1101/gad.351410.123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Accepted: 02/26/2024] [Indexed: 03/21/2024]
Abstract
Purified translesion synthesis (TLS) DNA polymerases (Pols) replicate through DNA lesions with a low fidelity; however, TLS operates in a predominantly error-free manner in normal human cells. To explain this incongruity, here we determine whether Y family Pols, which play an eminent role in replication through a diversity of DNA lesions, are incorporated into a multiprotein ensemble and whether the intrinsically high error rate of the TLS Pol is ameliorated by the components in the ensemble. To this end, we provide evidence for an indispensable role of Werner syndrome protein (WRN) and WRN-interacting protein 1 (WRNIP1) in Rev1-dependent TLS by Y family Polη, Polι, or Polκ and show that WRN, WRNIP1, and Rev1 assemble together with Y family Pols in response to DNA damage. Importantly, we identify a crucial role of WRN's 3' → 5' exonuclease activity in imparting high fidelity on TLS by Y family Pols in human cells, as the Y family Pols that accomplish TLS in an error-free manner manifest high mutagenicity in the absence of WRN's exonuclease function. Thus, by enforcing high fidelity on TLS Pols, TLS mechanisms have been adapted to safeguard against genome instability and tumorigenesis.
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Affiliation(s)
- Jung-Hoon Yoon
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch at Galveston, Galveston, Texas 77555, USA
| | - Karthi Sellamuthu
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch at Galveston, Galveston, Texas 77555, USA
| | - Louise Prakash
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch at Galveston, Galveston, Texas 77555, USA
| | - Satya Prakash
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch at Galveston, Galveston, Texas 77555, USA
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Phan AT, Ghantarchyan H, Khosravi C, Maknouni B, Bhagat A, Chen J, Ibrahim A, Hasan M. Sclerosing epithelioid fibrosarcoma associated with WRN gene variant presenting as chronic dyspnea and pathologic cervical fracture: a case report and review of the literature. J Med Case Rep 2023; 17:517. [PMID: 38104125 PMCID: PMC10725598 DOI: 10.1186/s13256-023-04249-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Accepted: 11/07/2023] [Indexed: 12/19/2023] Open
Abstract
BACKGROUND Sclerosing epithelioid fibrosarcoma is an aggressive sarcoma subtype with poor prognosis and limited response to conventional chemotherapy regimens. Diagnosis can be difficult owing to its variable presentation, and cases of sclerosing epithelioid fibrosarcoma are rare. Sclerosing epithelioid fibrosarcoma typically affects middle-aged individuals, with studies inconsistently citing gender predominance. Sclerosing epithelioid fibrosarcoma typically arises from the bones and soft tissues and often has local recurrence after resection and late metastases. Immunohistochemical staining typically is positive for mucin-4. Werner syndrome is due to an autosomal recessive mutation in the WRN gene and predisposes patients to malignancy. CASE PRESENTATION A 37-year-old Caucasian female presented to the emergency department with 4 months of dyspnea and back pain. She had been treated for pneumonia but had persistent symptoms. A chest, abdomen, and pelvis computed tomography showed near-complete right upper lobe collapse and consolidation, mediastinal lymphadenopathy, lytic spinal lesions, and a single 15-mm hypodense liver nodule. The patient underwent a transthoracic right upper lobe biopsy, bronchoscopy, endobronchial ultrasound with transbronchial lymph node sampling, and bronchoalveolar lavage of the right upper lobe. The bronchoalveolar lavage cytology was positive for malignant cells compatible with poorly differentiated non-small cell carcinoma; however, the cell block materials were insufficient to run immunostains for further investigation of the bronchoalveolar lavage results. Consequently, the patient also underwent a liver biopsy of the liver nodule, which later confirmed a diagnosis of sclerosing epithelioid fibrosarcoma. Next-generation sequencing revealed a variant of unknown significance in the WRN gene. She was subsequently started on doxorubicin. CONCLUSION Sclerosing epithelioid fibrosarcoma is a very rare entity, only cited approximately 100 times in literature to date. Physicians should be aware of this disease entity and consider it in their differential diagnosis. Though pulmonary involvement has been described in the context of sclerosing epithelioid fibrosarcoma, this malignancy may affect many organ systems, warranting extensive investigation. Through our diagnostic workup, we suggest a possible link between sclerosing epithelioid fibrosarcoma and the WRN gene. Further study is needed to advance our understanding of sclerosing epithelioid fibrosarcoma and its clinical associations as it is an exceedingly rare diagnosis.
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Affiliation(s)
- Alexander T Phan
- Department of Internal Medicine, Arrowhead Regional Medical Center, 400 N. Pepper Avenue, Colton, CA, 92324, USA.
- California University of Science and Medicine, Colton, CA, 92324, USA.
| | - Henrik Ghantarchyan
- Department of Internal Medicine, Arrowhead Regional Medical Center, 400 N. Pepper Avenue, Colton, CA, 92324, USA
- California University of Science and Medicine, Colton, CA, 92324, USA
| | - Chayanne Khosravi
- Department of Pulmonary and Critical Care Medicine, Arrowhead Regional Medical Center, Colton, CA, 92324, USA
- California University of Science and Medicine, Colton, CA, 92324, USA
| | - Bahareh Maknouni
- Department of Pulmonary and Critical Care Medicine, Arrowhead Regional Medical Center, Colton, CA, 92324, USA
- California University of Science and Medicine, Colton, CA, 92324, USA
| | - Ankur Bhagat
- Department of Internal Medicine, Arrowhead Regional Medical Center, 400 N. Pepper Avenue, Colton, CA, 92324, USA
- California University of Science and Medicine, Colton, CA, 92324, USA
| | - Jeff Chen
- California University of Science and Medicine, Colton, CA, 92324, USA
| | - Ahmad Ibrahim
- Department of Pathology, Arrowhead Regional Medical Center, Colton, CA, 92324, USA
| | - Mufadda Hasan
- Department of Pulmonary and Critical Care Medicine, Arrowhead Regional Medical Center, Colton, CA, 92324, USA
- California University of Science and Medicine, Colton, CA, 92324, USA
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Wang Q, Hou K, Yang J, Li H, Li C, Zhang Y, Tian J, Li C, Guo B, Jia S, Luo Y. Modified iPOND revealed the role of mutant p53 in promoting helicase function and telomere maintenance. Aging (Albany NY) 2023; 15:10767-10784. [PMID: 37827695 PMCID: PMC10599736 DOI: 10.18632/aging.205117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Accepted: 09/25/2023] [Indexed: 10/14/2023]
Abstract
The G-rich DNA, such as telomere, tends to form G-quadruplex (G4) structure, which slows down the replication fork progression, induces replication stress, and becomes the chromosome fragile sites. Here we described a molecular strategy that cells developed to overcome the DNA replication stress via DNA helicase regulation. The p53N236S (p53S) mutation has been found in the Werner syndrome mouse embryo fibroblast (MEFs) escaped from senescence, could be the driving force for cell escaping senescence. We revealed that the p53S could transcriptionally up-regulate DNA helicases expression, including Wrn, Blm, Timeless, Ddx, Mcm, Gins, Fanc, as well as telomere specific proteins Terf1, Pot1, through which p53S promoted the unwinding of G4 structures, and protected the cells from DNA replication stress induced by G4 stabilizer. By modified iPOND (isolation of proteins on nascent DNA) assay and telomere assay, we demonstrated that the p53S could promote the recruitment of those helicases to the DNA replication forks, facilitated the maintenance of telomere, and prevent the telomere dysfunction induced by G4 stabilizer. Interestingly, we did not observe the function of promoting G4 resolving and facilitating telomere lengthening in the cells with Li-Fraumeni Syndrome mutation-p53R172H (p53H), which suggests that this is the specific gain of function for p53S. Together our data suggest that the p53S could gain the new function of releasing the replication stress via regulating the helicase function and G4 structure, which benefits telomere lengthening. This strategy could be applied to the treatment of diseases caused by telomere replication stress.
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Affiliation(s)
- Qianqian Wang
- Department of Pathophysiology, School of Basic Medicine, Guizhou Medical University, Guiyang 550025, Guizhou, China
| | - Kailong Hou
- Lab of Molecular Genetics of Aging and Tumor, Medical School, Kunming University of Science and Technology, Kunming 650500, Yunnan Province, China
| | - Jun Yang
- Department of Pathophysiology, School of Basic Medicine, Guizhou Medical University, Guiyang 550025, Guizhou, China
| | - Haili Li
- Department of Human Anatomy, School of Basic Medicine, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan 250117, Shandong, China
| | - Cui Li
- Institute of Molecular Physiology, Shenzhen Bay Laboratory, Shenzhen 518132, Guangdong, China
| | - Yanduo Zhang
- Lab of Molecular Genetics of Aging and Tumor, Medical School, Kunming University of Science and Technology, Kunming 650500, Yunnan Province, China
| | - Jie Tian
- Department of Pathophysiology, School of Basic Medicine, Guizhou Medical University, Guiyang 550025, Guizhou, China
| | - Chuanbiao Li
- Department of Pathophysiology, School of Basic Medicine, Guizhou Medical University, Guiyang 550025, Guizhou, China
| | - Bing Guo
- Department of Pathophysiology, School of Basic Medicine, Guizhou Medical University, Guiyang 550025, Guizhou, China
| | - Shuting Jia
- Lab of Molecular Genetics of Aging and Tumor, Medical School, Kunming University of Science and Technology, Kunming 650500, Yunnan Province, China
| | - Ying Luo
- Department of Pathophysiology, School of Basic Medicine, Guizhou Medical University, Guiyang 550025, Guizhou, China
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Suárez-Díaz S, Castaño-Álvarez J, Noval-Tuñón I, Coto-Hernández R, Caminal-Montero L. Atypical Werner Syndrome: Another Scleroderma-Like Fibrosing Disorder. J Clin Rheumatol 2021; 27:S761-S763. [PMID: 32732526 DOI: 10.1097/rhu.0000000000001500] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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8
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Ye Y, Li HQ. [Report of a case with Werner's syndrome]. Zhonghua Er Ke Za Zhi 2009; 47:228-229. [PMID: 19573443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
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9
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Abstract
Werner syndrome is a rare disorder characterized by genome instability and the premature onset of several pathologies associated with aging. The gene responsible for Werner syndrome codes for a RecQ-type DNA helicase and is believed to be involved in different aspects of DNA repair, replication, and transcription. The human Werner protein (WRN) translocates from nucleoli to the nucleoplasm upon DNA damage. Here, for the first time we show WRN translocation following treatment with chloroquine (CHL) or trichostatin A (TSA), agents that alter chromatin structure without producing DNA breaks. In contrast to normal cells, WRN deficient human and murine cells incurred extensive DNA breaks upon CHL or TSA treatment, indicating a functional role for WRN in the proper response to these agents. Cells deficient for another RecQ-type helicase, Bloom syndrome, were not sensitive to these agents. WRN is known from in vitro studies to bind and stimulate the activity of topoisomerase I (Topol). CHL enhanced the association between WRN and Topol, suggesting that topological stress elicits a requirement for the stimulation of Topol by WRN. Supporting this idea, overexpression of Topol reduced CHL and TSA-induced DNA breaks in WRN null cells. We thus describe a novel function for WRN in ensuring genome stability to act in concert with Topol to prevent DNA breaks, following alterations in chromatin topology.
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Affiliation(s)
- Ramachander V N Turaga
- Centre de Recherche en Cancérologie de l'Université Laval, Hôpital Hôtel-Dieu de Québec, Québec, Canada
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Abstract
DNA helicases are required for virtually every aspect of DNA metabolism, including replication, repair, recombination and transcription. A comprehensive description of these essential biochemical processes requires detailed understanding of helicase mechanisms. These enzymes are ubiquitous, having been identified in viruses, prokaryotes and eukaryotes. Disease states, such as xeroderma pigmentosum, Cockayne's syndrome, Bloom's syndrome and Werner's syndrome, have been linked to defects in specific genes coding for DNA helicases. Helicases have been placed into different subfamilies based on sequence comparison. The largest subgroups are termed superfamily 1 and superfamily 2. A proposed mechanism for helicases in these classes has been described in terms of an ‘inchworm model’. The inchworm model includes conformational changes driven by ATP binding and hydrolysis that allow unidirectional translocation along DNA. A monomeric form of the enzyme is proposed to have two DNA-binding sites that enable sequential steps of DNA binding and release. Significant differences exist between helicases in important aspects of the models such as the oligomerization state of the enzyme with some helicases functioning as monomers, some as dimers and others as higher-order oligomers.
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Affiliation(s)
| | - Kevin D. Raney
- To whom correspondence should be addressed. Tel: +1 501 686 5244; Fax: +1 501 686 8169;
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Wirtenberger M, Frank B, Hemminki K, Klaes R, Schmutzler RK, Wappenschmidt B, Meindl A, Kiechle M, Arnold N, Weber BHF, Niederacher D, Bartram CR, Burwinkel B. Interaction of Werner and Bloom syndrome genes with p53 in familial breast cancer. Carcinogenesis 2006; 27:1655-60. [PMID: 16501249 DOI: 10.1093/carcin/bgi374] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Mutations of the human RecQ helicase genes WRN and BLM lead to rare autosomal recessive disorders, Werner and Bloom syndromes, which are associated with premature ageing and cancer predisposition. We tested the hypothesis whether three polymorphic, non-conservative amino acid exchanges in WRN and BLM act as low-penetrance familial breast cancer risk factors. Moreover, we examined the putative impact of p53 MspI 1798G>A, which is completely linked to p53PIN3, a 16 bp insertion/duplication that has been associated with reduced p53 expression, on familial breast cancer risk. Genotyping analyses, performed on 816 BRCA1/2 mutation-negative German familial breast cancer patients and 1012 German controls, revealed a significant association of the WRN Cys1367Arg polymorphism with familial breast cancer (OR = 1.28, 95% CI 1.06-1.54) and high-risk familial breast cancer (OR = 1.32, 95% CI 1.06-1.65). The analysis of p53 MspI 1798G>A, which is completely linked to p53PIN3, showed a significantly increased familial breast cancer risk for carriers of the 16 bp insertion/duplication, following a recessive mode (OR = 2.15, 95% CI = 1.12-4.11). WRN Cys1367Arg, located in the C-terminus, the binding site of p53, is predicted to be damaging. The joint effect of WRN Cys1367Arg and p53 MspI resulted in an increased breast cancer risk compared to the single polymorphisms (OR = 3.39, 95% CI 1.19-9.71). In conclusion, our study indicates the importance of inherited variants in the WRN and p53 genes for familial breast cancer susceptibility.
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Affiliation(s)
- Michael Wirtenberger
- Division of Molecular Genetic Epidemiology, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 580, 69120, Heidelberg, Germany.
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Peláez R, Aguilar JL. [Anesthesia in Werner syndrome]. Rev Esp Anestesiol Reanim 2006; 53:122-3. [PMID: 16553347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
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13
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Karmakar P, Bohr VA. Cellular dynamics and modulation of WRN protein is DNA damage specific. Mech Ageing Dev 2005; 126:1146-58. [PMID: 16087220 DOI: 10.1016/j.mad.2005.06.004] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2005] [Revised: 06/04/2005] [Accepted: 06/06/2005] [Indexed: 11/15/2022]
Abstract
The human premature aging protein Werner (WRN), deficient in Werner syndrome (WS), is localized mainly to the nucleolus in many cell types. DNA damage or replication arrest causes WRN to redistribute from the nucleolus to the nucleoplasm into discrete foci. In this study, we have investigated DNA damage specific cellular redistribution of WRN. In response to agents causing DNA double strand breaks or DNA base damage, WRN is re-distributed from the nucleolus to the nucleoplasm in a reversible manner. However, after ultraviolet (UV) irradiation such redistribution of WRN is largely absent. We also show that WRN is associated with the insoluble protein fraction of cells after exposure to various kinds of DNA damage but not after UV irradiation. Further, we have studied the DNA damage specific post-translational modulation of WRN. Our results show that WRN is acetylated after mytomycin C or methyl methane-sulfonate treatment, but not after UV irradiation. Also, DNA damage specific phosphorylation of WRN is absent in UV irradiated cells. Inhibition of phosphorylation fails to restore WRN localization. Thus, our results suggest that the dynamics of WRN protein trafficking is DNA damage specific and is related to its post-translational modulation. The results also indicate a preferred role of WRN in recombination and base excision repair rather than nucleotide excision repair.
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Affiliation(s)
- Parimal Karmakar
- Laboratory of Molecular Gerontology, National Institute on Aging, National Institutes of Health, 5600 Nathan Shock Dr., Box 1, Baltimore, MD 21224, USA
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Blank A, Bobola MS, Gold B, Varadarajan S, D Kolstoe D, Meade EH, Rabinovitch PS, Loeb LA, Silber JR. The Werner syndrome protein confers resistance to the DNA lesions N3-methyladenine and O6-methylguanine: implications for WRN function. DNA Repair (Amst) 2004; 3:629-38. [PMID: 15135730 DOI: 10.1016/j.dnarep.2004.02.003] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/11/2004] [Indexed: 11/23/2022]
Abstract
The Werner syndrome (WS) protein (WRN), a DNA helicase/exonuclease, is required for genomic stability and avoidance of cancer. Current evidence suggests that WRN is involved in the resolution of stalled and/or collapsed replication forks. This function is indicated, in part, by replication defects in WS cells and by hypersensitivity to agents causing major structural aberrations in DNA that block replication. We show here that antisense suppression of WRN in two human glioma cell lines reproduces hallmarks of the drug cytotoxicity profile of WS cells, namely, hypersensitivity to 4-nitroquinoline 1-oxide, camptothecin and hydroxyurea. We also show that antisense-treated cells are hypersensitive to methyl-lexitropsin, a site-specific alkylating agent that produces mainly N3-methyladenine, a cytotoxic and replication-blocking lesion. Antisense-treated cells are hypersensitive to O(6)-methylguanine adducts as well, but only when repair by O(6)-methylguanine-DNA methyltransferase is lacking. Our results illustrate the drug sensitivity caused by deficiency of WRN in a uniform genetic background. They extend the WRN DNA damage sensitivity spectrum to methyl base adducts that can result in blocked replication, and suggest that WRN may be required for resumption of processive replication when incomplete repair of DNA damage leaves blocking lesions at forks. The evidence that highly disparate lesions fall within the purview of WRN, and that abrogating DNA repair can reveal dependence on WRN, suggests that WRN may protect the genome from the lethal, mutagenic and carcinogenic effects of widely diverse DNA damage arising from endogenous processes and environmental agents.
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Affiliation(s)
- A Blank
- Department of Pathology, University of Washington, Seattle, WA 98195-7705, USA
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16
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Faragher R. An interview with Richard Faragher, D.Phil. J Anti Aging Med 2003; 6:181-6. [PMID: 14987432 DOI: 10.1089/109454503322733036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
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Abstract
We review the genes and proteins related to the homologous recombinational repair (HRR) pathway that are implicated in cancer through either genetic disorders that predispose to cancer through chromosome instability or the occurrence of somatic mutations that contribute to carcinogenesis. Ataxia telangiectasia (AT), Nijmegen breakage syndrome (NBS), and an ataxia-like disorder (ATLD), are chromosome instability disorders that are defective in the ataxia telangiectasia mutated (ATM), NBS, and Mre11 genes, respectively. These genes are critical in maintaining cellular resistance to ionizing radiation (IR), which kills largely by the production of double-strand breaks (DSBs). Bloom syndrome involves a defect in the BLM helicase, which seems to play a role in restarting DNA replication forks that are blocked at lesions, thereby promoting chromosome stability. The Werner syndrome gene (WRN) helicase, another member of the RecQ family like BLM, has very recently been found to help mediate homologous recombination. Fanconi anemia (FA) is a genetically complex chromosomal instability disorder involving seven or more genes, one of which is BRCA2. FA may be at least partially caused by the aberrant production of reactive oxidative species. The breast cancer-associated BRCA1 and BRCA2 proteins are strongly implicated in HRR; BRCA2 associates with Rad51 and appears to regulate its activity. We discuss in detail the phenotypes of the various mutant cell lines and the signaling pathways mediated by the ATM kinase. ATM's phosphorylation targets can be grouped into oxidative stress-mediated transcriptional changes, cell cycle checkpoints, and recombinational repair. We present the DNA damage response pathways by using the DSB as the prototype lesion, whose incorrect repair can initiate and augment karyotypic abnormalities.
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Affiliation(s)
- Larry H Thompson
- Biology and Biotechnology Research Program, Lawrence Livermore National Laboratory L-441, P.O. Box 808, Livermore, CA 94551-0808, USA.
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18
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Matsuo M. [ Werner syndrome]. Ryoikibetsu Shokogun Shirizu 2002:808-9. [PMID: 11529034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Affiliation(s)
- M Matsuo
- Division of Medical Genetics, Kanagawa Children's Medical Center/Department of Pediatrics, Tokyo Women's Medical University
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Abstract
We report three cases of papillary thyroid carcinoma occurring after successful treatment of osteosarcoma. Only one of the three patients received radiation therapy (to the chest) as part of the primary treatment of osteosarcoma. The onset of thyroid carcinoma occurred between 8 and 16 years from the cessation of osteosarcoma therapy. All patients are alive and disease-free from both malignancies. Whereas the association between osteosarcoma and thyroid carcinoma has not previously been recognized, there have been five case reports of these two entities occurring in the same patient. Three of these cases occurred in patients with Werner syndrome. None of the patients reported here had physical stigmata of Werner syndrome or a family history consistent with a hereditary cancer syndrome. Thyroid carcinoma occurs infrequently in patients with osteosarcoma, but in view of the rarity of these two disorders, this association may represent an inherited predisposition to these malignancies.
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Affiliation(s)
- M Verneris
- Department of Pediatrics, Stanford University School of Medicine, California 94305-5208, USA
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20
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Cohen H, Sinclair DA. Recombination-mediated lengthening of terminal telomeric repeats requires the Sgs1 DNA helicase. Proc Natl Acad Sci U S A 2001; 98:3174-9. [PMID: 11248051 PMCID: PMC30626 DOI: 10.1073/pnas.061579598] [Citation(s) in RCA: 129] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2000] [Indexed: 11/18/2022] Open
Abstract
The Saccharomyces cerevisiae SGS1 gene encodes a RecQ-like DNA helicase, human homologues of which are implicated in the genetic instability disorders, Bloom syndrome (BS), Rothmund-Thomson syndrome (RTS), and Werner syndrome (WS). Telomerase-negative yeast cells can recover from senescence via two recombinational telomere elongation pathways. The "type I" pathway generates telomeres with large blocks of telomeric and subtelomeric sequences and short terminal repeat tracts. The "type II" pathway generates telomeres with extremely long heterogeneous terminal repeat tracts, reminiscent of the long telomeres observed in telomerase-deficient human tumors and tumor-derived cell lines. Here, we report that telomerase-negative (est2) yeast cells lacking SGS1 senesced more rapidly, experienced a higher rate of telomere erosion, and were delayed in the generation of survivors. The est2 sgs1 survivors that were generated grew poorly, arrested in G(2)/M and possessed exclusively type I telomeres, implying that SGS1 is critical for the type II pathway. The mouse WS gene suppressed the slow growth and G(2)/M arrest phenotype of est2 sgs1 survivors, arguing that the telomeric function of SGS1 is conserved. Reintroduction of SGS1 into est2 sgs1 survivors restored growth rate and extended terminal tracts by approximately 300 bp. Both phenotypes were absolutely dependent on Sgs1 helicase activity. Introduction of an sgs1 carboxyl-terminal truncation allele with helicase activity restored growth rate without extending telomeres in most cases, demonstrating that type II telomeres are not necessary for normal growth in the absence of telomerase.
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Affiliation(s)
- H Cohen
- Department of Pathology, Harvard Medical School, 200 Longwood Avenue, Boston, MA 02115, USA
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Kocabora MS, Kürkçüoglu AR, Engin G, Yilmazli C, Arslan O. [Cataract surgery by phacoemulsification in Werner's syndrome]. J Fr Ophtalmol 2000; 23:1012-5. [PMID: 11139694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
We report two cases of Werner's syndrome, a sister and a brother of 32 and 28 years, respectively, who were operated on for cataracts in both eyes. This hereditary syndrome, also called the adult progeria, is characterized by several manifestations of premature aging. Cataract surgery in this syndrome often predisposes to complications such as wound dehiscence and bullous keratopathy. The 4 eyes of the two patients were operated on using the phacoemulsification technique. The operations were successful, and we did not observe any serious complications during the 2-year follow-up period: cystoid macular edema in the brother's right eye was easily cured by topical indomethacin. This experience with these two patients showed that Werner's syndrome cataracts can be safely managed with the current phacoemulsification and small-incision surgery techniques.
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Affiliation(s)
- M S Kocabora
- Service d'ophtalmologie, Hôpital Vakif Gureba, Istanbul, Turquie
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22
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Abstract
The aging process has multiple causes. However, there is now substantial evidence consistent with the hypothesis that (i) all normal mammalian somatic cells have a finite capacity to replicate and (ii) that gradual cell turnover throughout the lifespan of a mammal eventually exhausts this finite capacity. This results in a gradual accumulation of senescent (irreversibly post-mitotic) cells with increasing age. These cells display a radically different phenotype to their growing counterparts, which has the potential to compromise tissue function. Perhaps the best evidence for this is seen in Werner's syndrome, a rare genetic disease, in which patients display most of the features of accelerated aging, together with a profoundly compromised replicative lifespan in certain tissue lineages. Several classes of human cells are now known to count divisions by monitoring the progressive attrition of chromosomal ends (telomeres), leading to the activation of a p53-p21waf-dependent G1 checkpoint. Ectopic expression of telomerase has been shown to prevent senescence in several cell types and offers the potential for interventions in the aging process based on tissue engineering, gene therapy or homeografts. However, this telomere-driven senescence mechanism seems to be absent from rodents, which use telomere-independent means (perhaps based upon p14arf) to count divisions. Similar senescence pathways are now being reported in humans, and this, coupled with the demonstration of tissue-specific telomeric loss rates, has the potential to render strategies based on the use of telomerase dependent on the characteristics of the target tissue. Werner's syndrome may provide strong clues regarding the potential limitations and prospects of such future treatments.
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Affiliation(s)
- E L Ostler
- School of Pharmacy and Biomolecular Sciences, University of Brighton, East Sussex, UK
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23
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Abstract
BACKGROUND Bloom's syndrome (BS) is an autosomal recessive disorder causing short stature, immunodeficiency, and an increased risk of cancer. Increased rates of sister chromatid exchange and chromosomal aberration have been observed in cells having defects in the BLM gene. Among five kinds of human RecQ helicases cloned, the mutations in WRN and RecQL4 have been known as the causes of premature ageing. Little is, however, known about the function of BLM helicase in ageing. RESULTS We show that human BLM, but not WRN can prevent the premature ageing and the increased homologous recombination at the rDNA loci caused by sgs1 mutation. Unexpectedly, the levels of ERCs (extrachromosomal rDNA circles), the products of homologous recombination, formed in 7-generation cells of the wild-type or the sgs1:BLM strain were comparable with those of the sgs1 or the sgs1:WRN age-matched-old cells. CONCLUSION These results imply that BLM helicase may have an important role in human ageing. In addition, these data suggest that the accumulated ERCs per se may be not the cause of premature ageing in yeast, inconsistent with the model proposed by Sinclair & Guarente. We discuss a new model, which explains how Sgs1 or BLM helicase suppresses premature ageing in yeast.
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Affiliation(s)
- S J Heo
- Department of Molecular Biology, Institute of Medical Science, University of Tokyo, Shirokanedai 4-6-1, Minato-ku, Tokyo 108-8639, Japan
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VALERO A, GELLEI B. Retinitis pigmentosa, hypertension, and uraemia in Werner's syndrome. Report of a case, with necropsy findings. Br Med J 1998; 2:351-4. [PMID: 13840847 PMCID: PMC2097513 DOI: 10.1136/bmj.2.5195.351] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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26
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Kataoka H, Tahara H, Watanabe T, Sugawara M, Ide T, Goto M, Furuichi Y, Sugimoto M. Immortalization of immunologically committed Epstein-Barr virus-transformed human B-lymphoblastoid cell lines accompanied by a strong telomerase activity. Differentiation 1997; 62:203-11. [PMID: 9503605 DOI: 10.1046/j.1432-0436.1998.6240203.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The immunological characteristics and immortalization processes of three EBV-transformed human B-lymphoblastoid cell lines, N0003, N0005 and N6803, with strong telomerase and infinitively proliferating activities are described. The three cell lines were apparently immortalized: they developed a strong telomerase activity at the population doubling levels (PDLs) between 11 and 135, and continued proliferation over 250 PDLs. All the cell lines expressed CD22, CD19 and CD20 antigens. They were uniformly stained with IgM (N0005), IgG (N6803) or IgA (N0003) at early PDLs between 17 and 20, and they secreted the corresponding class of Ig into the medium; the N6803 and N0003 cell lines continued to secrete each class of Ig at decreased levels while the N0005 cell line expressed or secreted virtually no Ig after immortalization. Karyotype analysis of the immortalized cell lines showed that they were derived from a single cell because they shared a set of abnormal chromosomes within each cell population, and two of the cell lines attained clonal characteristics before they developed a strong telomerase activity. These results indicate that the three immortalized cell lines with a strong telomerase activity correspond to the intermediate stages of B-cell differentiation naturally committed to a specific Ig class, and suggest that they were derived from a B-lymphoblastoid cell committed to a specific class of Ig with poor telomerase activity, rather than from a strongly telomerase-positive B-lymphoblastoid cell either committed or multipotential.
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Affiliation(s)
- H Kataoka
- AGENE Research Institute, Kanagawa, Japan
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28
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Abstract
Nuclei from cultured human cells were examined by differential scanning calorimetry. Their melting profiles revealed four structural transitions at 60, 76, 88, and 105 degrees C (transitions I-IV, respectively). In immortalized (i.e., tumor) cell cultures and in normal cell cultures of low passage number, melting profiles were dominated by the 105 degrees C transition (transition IV), but in vitro aging of normal and Werner syndrome cells was associated with a marked decrease in transition IV followed by an increase in transition III at the expense of transition IV. At intermediate times in the aging process, much DNA melted at a temperature range (95-102 degrees C) intermediate between transitions III and IV, and this is consistent with the notion that aging of cell cultures is accompanied by an increase in single-strand character of the DNA. Calorimetric changes were observed in the melting profile of nuclei from UV-irradiated tumor cells that resembled the age-induced intermediate melting of chromatin. It is suggested that aging is accompanied by an increase in single-stranded character of the DNA in chromatin, which lowers its melting temperature, followed by strand breaks in the DNA that destroy its supercoiling potential.
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Affiliation(s)
- M Almagor
- Department of Biochemistry, University of California, Berkeley 94720
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29
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Plamieniak Z, Bednarek-Tupikowska G, Szymczak J. [Werner's syndrome]. Pol Tyg Lek 1987; 42:1393-5. [PMID: 3447100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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30
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Murata K. [Werner's syndrome]. Kango Gijutsu 1985; 31:661-2. [PMID: 3847563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Lee WK, Root AW, Fenske N. Bilateral branchial cleft sinuses associated with intrauterine and postnatal growth retardation, premature aging, and unusual facial appearance: a new syndrome with dominant transmission. Am J Med Genet 1982; 11:345-52. [PMID: 7200726 DOI: 10.1002/ajmg.1320110311] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
A mother and son with bilateral branchial sinuses, intrauterine and postnatal growth retardation, unusual facial appearance, and premature aging in the mother are reported. No other members of the family are similarly affected. No hormonal or systemic cause of growth retardation was identified. Chromosomal studies with G-banding were normal. It is suggested that this syndrome is a dominant trait, the mother being the initial mutant.
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32
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Tajima T, Watanabe T, Iijima K, Ohshika Y, Yamaguchi H. The increase of glycosaminoglycan synthesis and accumulation on the cell surface of cultured skin fibroblasts in Werner's syndrome. Exp Pathol 1981; 20:221-9. [PMID: 7333366 DOI: 10.1016/s0232-1513(81)80026-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Glycosaminoglycans (GAGS) synthesis and accumulation on the cell surface of skin fibroblasts in two patients with Werner's syndrome were measured by the incorporation of 3H-glucosamine and 35S-sulfate. The strains of fibroblasts from Werner's syndrome (WF) had a much higher production of GAGS and accumulation on the cell surface than did the controls. Uronic acid was measured by means of the carbazole sulfuric acid method and orcinol method and it was revealed that WF fibroblasts had a large amount of total uronic acid in the cell layer, the largest portion being the iduronic acid fraction. Electrophoretic analysis of the GAGS of WF showed an increase of production. Increased release into the medium and accumulation of pericellular glycosaminoglycans was observed in hyaluronic acid (HA), heparan sulfate + dermatan sulfate (HS + DS), and chondroitin sulfate (CHS) fractions. No specific accumulation of GAGS in the intracellular pools was observed.
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33
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Basler JW, David JD, Agris PF. Deteriorating collagen synthesis and cell ultrastructure accompanying senescence of human normal and Werner's syndrome fibroblast cell strains. Exp Cell Res 1979; 118:73-84. [PMID: 759216 DOI: 10.1016/0014-4827(79)90585-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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34
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Arashima S. [Progeria syndrome and Werner's syndrome]. Nihon Rinsho 1978; Suppl:1472-3. [PMID: 691397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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35
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Fujiwara Y, Higashikawa T, Tatsumi M. A retarded rate of DNA replication and normal level of DNA repair in Werner's syndrome fibroblasts in culture. J Cell Physiol 1977; 92:365-74. [PMID: 903377 DOI: 10.1002/jcp.1040920305] [Citation(s) in RCA: 130] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
We investigated the cloning efficiency, DNA repair, and the rate of DNA replication in the skin fibroblasts from patients with Werner's syndrome (WS) of an autosomal recessive premature aging disease. Five WS strains exhibited normal levels of sensitivity toward X-ray and UV killings and repair of X-ray induced single strand breaks of DNA (rejoining) and UV damage to DNA (unscheduled DNA synthesis). The sedimentation of newly synthesizing DNA in alkaline sucrose gradients demonstrated a characteristic feature that only the elongation rate of DNA chains, estimated by the molecular weight increase, was significantly slower during early passages in WS cells than in normal Hayflick Phase II fibroblasts. In addition, plating efficiencies as well as the replicative potentials of five WS strains were more limited than those of normal cells under the identical culture conditions. It seems therefore that at least in the WS cells tested, the slow rate of DNA replication may be more related to the shortened lifespan and enhanced cell death, as manifestation of premature senescence at the cellular level, than be the DNA repair ability.
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36
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Gichev IP, Mednikova NP. [Syndrome of premature senility]. Klin Med (Mosk) 1977; 55:110-1. [PMID: 895040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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37
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Abstract
A case of Werner syndrome is reported. The patient was prematurely old, had skin atrophy, characteristic posterior subcapsular cataracts and prepubertal primary hypogonadism. Additional ocular features compatible with premature ageing included presbyopia, arcus seniles and diminished tear flow. Diabetes mellitus, poliosis, baldness and beak-like nose were not present.
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Guilaine J, Raymond JP, Merle F, Connes A, Charial V. [Werner's syndrome]. Ann Dermatol Venereol 1977; 104:77-8. [PMID: 843037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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39
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Editorial: Premature ageing syndromes. Br Med J 1974; 4. [PMID: 4434115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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40
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Yasuhara M, Kiyokane K, Sakai T, Oiwa T, Hashi N. A case of Werner's syndrome. Jinrui Idengaku Zasshi 1974; 19:86-7. [PMID: 4476871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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41
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Gsell O. [The longitudinal geriatric studies (preclinical geriatrics)]. Hippokrates 1973; 44:284-93. [PMID: 4594112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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42
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Vandaele R. [Werner's syndrome. Familial ulcerous scleroderma with cataract and diabetes]. Arch Belg Dermatol Syphiligr 1973; 29:251-4. [PMID: 4789507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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43
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Mozziconacci P. [Infantile chronic polyarthritis. Introduction]. Rev Prat 1972; 22:2059-60. [PMID: 4646990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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44
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45
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Abstract
Progeria is an autosomal recessive disorder showing precocious senility. The cultured skin fibroblast from both the homozygous affected individual and the heterozygous parents can be distinguished from normals by decreased cell growth in culture. Mitotic activity, DNA synthesis, and cloning efficiency are markedly reduced.
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46
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Minami S, Sugiyama K, Sakurai N, Aoki S, Omori H. [Case of Werner's syndrome]. Naika 1970; 26:946-50. [PMID: 5478150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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48
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Frenkel G. [Mucosal atrophy with special reference to the Werner syndrome]. Dtsch Zahnarztl Z 1970; 25:1026-9. [PMID: 5274297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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49
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Martin GM, Sprague CA, Epstein CJ. Replicative life-span of cultivated human cells. Effects of donor's age, tissue, and genotype. J Transl Med 1970; 23:86-92. [PMID: 5431223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
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50
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Holti G. Scleroderma. Practitioner 1970; 204:644-54. [PMID: 5431330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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