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Naebi H, Bandegi A, Talebinasab F, Samidoust P, Norollahi SE, Vahidi S, Samadani AA. MUTYH and KLF6 gene expression fluctuations in tumor tissue and tumor margins tissues of colorectal cancer. J Egypt Natl Canc Inst 2022; 34:57. [PMID: 36464752 DOI: 10.1186/s43046-022-00158-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Accepted: 10/26/2022] [Indexed: 12/05/2022] Open
Abstract
BACKGROUND Colorectal cancer (CRC) is one of the most important cancers in the world, and its prevalence varies depending on the geographical area. Genetically, tumor regeneration in CRC as a multi-step process involves activating mutations in protocogenes and losing the function of tumor suppressor genes as well as DNA repair and recovery genes. Occur in this way, our goal was to investigate the expression of KLF6 genes as a tumor suppressor and MUTYH involved in the DNA repair process in colorectal cancer. METHODS This research was conducted during the years 2019-2018 in Razi Hospital, Rasht. The subjects included 30 tumoral and 30 non-tumoral tissues of colorectal cancer and 20 healthy controls. The real-time PCR method was used to investigate the gene expression. For data analysis by SPSS, parametric statistical tests ANOVA and T test and regression analysis were used and p value values less than 0.05 were considered significant. RESULTS The expression of KLF6 gene in tumoral tissues showed a significant decrease compared to non-tumoral tissues (P = 0.04). Also, the expression of MUTYH gene in tumor tissue showed a significant decrease compared to non-tumoral (P = 0.02) and this decrease in MUTYH gene expression had a significant relationship with increasing tumor stage (P = 0.01). CONCLUSION These findings suggest that decreased expression of KLF6 and MUTYH genes in the study population has a significant relationship with colorectal cancer and can be considered as tumor marker in diagnostic purpose.
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Affiliation(s)
- Hoora Naebi
- Department of Biochemistry, Faculty of Medicine, Semnan University of Medical Sciences, Semnan, Iran.,Student Research Committee, Semnan University of Medical Sciences, Semnan, Iran
| | - Ahmadreza Bandegi
- Department of Biochemistry, Faculty of Medicine, Semnan University of Medical Sciences, Semnan, Iran. .,Cancer Research Center and Department of Immunology, Semnan University of Medical Sciences, Semnan, Iran.
| | - Fereshteh Talebinasab
- Department of Biochemistry, Faculty of Medicine, Semnan University of Medical Sciences, Semnan, Iran.,Student Research Committee, Semnan University of Medical Sciences, Semnan, Iran
| | - Pirouz Samidoust
- Razi Clinical Research Development Unit, Guilan university of medical Sciences, Rasht, Iran
| | - Seyedeh Elham Norollahi
- Cancer Research Center and Department of Immunology, Semnan University of Medical Sciences, Semnan, Iran
| | - Sogand Vahidi
- Medical Biology Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Ali Akbar Samadani
- Guilan Road Trauma Research Center, Guilan University of Medical Sciences, Rasht, Iran.
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Jia C, Wang Q, Yao X, Yang J. The Role of DNA Damage Induced by Low/High Dose Ionizing Radiation in Cell Carcinogenesis. EXPLORATORY RESEARCH AND HYPOTHESIS IN MEDICINE 2021; 000:000-000. [DOI: 10.14218/erhm.2021.00020] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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3
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Babaei K, Khaksar R, Zeinali T, Hemmati H, Bandegi A, Samidoust P, Ashoobi MT, Hashemian H, Delpasand K, Talebinasab F, Naebi H, Mirpour SH, Keymoradzadeh A, Norollahi SE. Epigenetic profiling of MUTYH, KLF6, WNT1 and KLF4 genes in carcinogenesis and tumorigenesis of colorectal cancer. Biomedicine (Taipei) 2019; 9:22. [PMID: 31724937 PMCID: PMC6855188 DOI: 10.1051/bmdcn/2019090422] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 09/02/2019] [Indexed: 12/13/2022] Open
Abstract
Colorectal cancer (CRC) is distinguished by epigenetic elements like DNA methylation, histone modification, histone acetylation and RNA remodeling which is related with genomic instability and tumor initiation. Correspondingly, as a main epigenetic regulation, DNA methylation has an impressive ability in order to be used in CRC targeted therapy. Meaningly, DNA methylation is identified as one of most important epigenetic regulators in gene expression and is considered as a notable potential driver in tumorigenesis and carcinogenesis through gene-silencing of tumor suppressors genes. Abnormal methylation situation, even in the level of promoter regions, does not essentially change the gene expression levels, particularly if the gene was become silenced, leaving the mechanisms of methylation without any response. According to the methylation situation which has a strong eagerness to be highly altered on CpG islands in carcinogenesis and tumorigenesis, considering its epigenetic fluctuations in finding new biomarkers is of great importance. Modifications in DNA methylation pattern and also enrichment of methylated histone signs in the promoter regions of some certain genes like MUTYH, KLF4/6 and WNT1 in different signaling pathways could be a notable key contributors to the upregulation of tumor initiation in CRC. These epigenetic alterations could be employed as a practical diagnostic biomarkers for colorectal cancer. In this review, we will be discuss these fluctuations of MUTYH, KLF4/6 and WNT1 genes in CRC.
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Affiliation(s)
- Kosar Babaei
- Department of Biology, Islamic Azad University of Tonekabon Branch, Tonekabon, Iran
| | - Roya Khaksar
- Gastrointestinal and Liver Diseases Research Center, Guilan University of Medical Sciences, Rasht, Iran
| | - Tahereh Zeinali
- Gastrointestinal and Liver Diseases Research Center, Guilan University of Medical Sciences, Rasht, Iran
| | - Hossein Hemmati
- Razi Clinical Research Development Unit, Guilan University of Medical Sciences, Rasht, Iran
| | - Ahmadreza Bandegi
- Department of Biochemistry, Faculty of Medicine, Semnan University of Medical Sciences, Semnan, Iran
| | - Pirouz Samidoust
- Razi Clinical Research Development Unit, Guilan University of Medical Sciences, Rasht, Iran
| | - Mohammad Taghi Ashoobi
- Department of Surgery, Poursina Hospital, Guilan University of Medical Sciences, Rasht, Iran
| | - Hooman Hashemian
- Pediatric Diseases Research Center,Guilan University of Medical ciences, Rasht, Iran
| | - Kourosh Delpasand
- School of Medicine, Kurdistan University of Mdical Ciences, Sanandaj, Iran
| | - Fereshteh Talebinasab
- Department of Biochemistry, Faculty of Medicine, Semnan University of Medical Sciences, Semnan, Iran
| | - Hoora Naebi
- Department of Biochemistry, Faculty of Medicine, Semnan University of Medical Sciences, Semnan, Iran
| | - Seyed Hossein Mirpour
- Department of Hematology and Oncology, Razi hospital, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran
| | - Arman Keymoradzadeh
- Gastrointestinal and Liver Diseases Research Center, Guilan University of Medical Sciences, Rasht, Iran
| | - Seyedeh Elham Norollahi
- Gastrointestinal and Liver Diseases Research Center, Guilan University of Medical Sciences, Rasht, Iran
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4
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Su X, Xue Y, Wei J, Huo X, Gong Y, Zhang H, Han R, Chen Y, Chen H, Chen J. Establishment and Characterization of gc-006-03, a Novel Human Signet Ring Cell Gastric Cancer Cell Line Derived from Metastatic Ascites. J Cancer 2018; 9:3236-3246. [PMID: 30271482 PMCID: PMC6160672 DOI: 10.7150/jca.26051] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Accepted: 07/17/2018] [Indexed: 12/15/2022] Open
Abstract
Signet ring cell gastric cancer (SRCGC) is a special type of gastric cancer with rapid progression and poor prognosis. However, few available SRCGC cell lines from Chinese patients can be used for research, the molecular mechanism of its growth and metastasis is still incompletely understood. In this study, we established and characterized a novel SRCGC cell line, gc-006-03.The cells showed a tendency to pile up without contact inhibition. G-band karyotypes of gc-006-03 were revealed hypotriploid with a modal chromosome number of 51. Immunohistochemistry analysis showed that the cells were positive for CEA, CK7, CDX2 and Ki-67(45%), and negative for CK20, TTF1and Li-cadherin. Flow cytometry analysis showed that gc-006-3 had 25% of CD44+ cells. The cells possessed strong clonality and high plating efficiency, and the doubling time was 36h. The cells grew vigorously for more than 100 passages in serial culture. Meanwhile, the cells showed a high rate of tumor formation. Tumors were observed in all of the nude mice (5/5) given injections of the cells. The metastatic capability of the cell line was found in zebrafish injected the cells. The results of whole genome sequencing revealed the unique genomic characteristics of gc-006-03. In summary, this new stable cell line may be useful in basic and clinical research on gastric signet ring cell carcinoma.
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Affiliation(s)
- Xinyu Su
- Department of Oncology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China.,Department of Radiation Oncology, the Affiliated Huai'an Hospital of Xuzhou Medical College, Huai'an, China
| | - Yiqi Xue
- Department of Oncology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
| | - Jingsun Wei
- Department of Oncology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
| | - Xinying Huo
- Department of Oncology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
| | - Yang Gong
- Department of Oncology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
| | - Honghong Zhang
- Department of Oncology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
| | - Rongbo Han
- Department of Oncology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
| | - Yuetong Chen
- Department of Oncology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
| | - Hong Chen
- Department of Oncology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
| | - Jinfei Chen
- Department of Oncology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
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Mirza-Aghazadeh-Attari M, Darband SG, Kaviani M, Mihanfar A, Aghazadeh Attari J, Yousefi B, Majidinia M. DNA damage response and repair in colorectal cancer: Defects, regulation and therapeutic implications. DNA Repair (Amst) 2018; 69:34-52. [PMID: 30055507 DOI: 10.1016/j.dnarep.2018.07.005] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Revised: 07/15/2018] [Accepted: 07/15/2018] [Indexed: 12/11/2022]
Abstract
DNA damage response, a key factor involved in maintaining genome integrity and stability, consists of several kinase-dependent signaling pathways, which sense and transduce DNA damage signal. The severity of damage appears to determine DNA damage responses, which can include cell cycle arrest, damage repair and apoptosis. A number of recent studies have demonstrated that defection in signaling through this network is thought to be an underlying mechanism behind the development and progression of various types of human malignancies, including colorectal cancer. In this review, colorectal cancer and its molecular pathology as well as DNA damage response is briefly introduced. Finally, the involvement of key components of this network in the initiation/progression, prognosis, response to treatment and development of drug resistance is comprehensively discussed.
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Affiliation(s)
- Mohammad Mirza-Aghazadeh-Attari
- Aging Research Institute, Tabriz University of Medical Sciences, Tabriz, Iran; Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Saber Ghazizadeh Darband
- Danesh Pey Hadi Co., Health Technology Development Center, Urmia University of Medical Sciences, Urmia, Iran
| | - Mojtaba Kaviani
- School of Nutrition and Dietetics, Acadia University, Wolfville, Nova Scotia, Canada
| | - Ainaz Mihanfar
- Stem Cell and Regenerative Medicine Institute, Tabriz University of Medical Sciences, Tabriz, Iran
| | | | - Bahman Yousefi
- Molecular Medicine Research Center, Tabriz University of Medical Sciences, Tabriz, Iran; Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
| | - Maryam Majidinia
- Solid Tumor Research Center, Urmia University of Medical Sciences, Urmia, Iran.
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Yanus G, Akhapkina T, Ivantsov A, Preobrazhenskaya E, Aleksakhina S, Bizin I, Sokolenko A, Mitiushkina N, Kuligina E, Suspitsin E, Venina A, Holmatov M, Zaitseva O, Yatsuk O, Pashkov D, Belyaev A, Togo A, Imyanitov E, Iyevleva A. Spectrum of APC and MUTYH germ-line mutations in Russian patients with colorectal malignancies. Clin Genet 2018; 93:1015-1021. [DOI: 10.1111/cge.13228] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Revised: 01/28/2018] [Accepted: 01/31/2018] [Indexed: 12/14/2022]
Affiliation(s)
- G.A. Yanus
- N.N. Petrov Institute of Oncology, Laboratory of Molecular Oncology; St.-Petersburg 197758 Russia
- St.-Petersburg Pediatric Medical University, Department of Medical Genetics; St.-Petersburg 194100 Russia
| | - T.A. Akhapkina
- N.N. Petrov Institute of Oncology, Laboratory of Molecular Oncology; St.-Petersburg 197758 Russia
- St.-Petersburg Pediatric Medical University, Department of Medical Genetics; St.-Petersburg 194100 Russia
| | - A.O. Ivantsov
- N.N. Petrov Institute of Oncology, Laboratory of Molecular Oncology; St.-Petersburg 197758 Russia
- St.-Petersburg Pediatric Medical University, Department of Medical Genetics; St.-Petersburg 194100 Russia
| | - E.V. Preobrazhenskaya
- N.N. Petrov Institute of Oncology, Laboratory of Molecular Oncology; St.-Petersburg 197758 Russia
- St.-Petersburg Pediatric Medical University, Department of Medical Genetics; St.-Petersburg 194100 Russia
| | - S.N. Aleksakhina
- N.N. Petrov Institute of Oncology, Laboratory of Molecular Oncology; St.-Petersburg 197758 Russia
| | - I.V. Bizin
- Peter the Great St.-Petersburg Polytechnic University, Department of Bioinformatics; St.-Petersburg 195251 Russia
| | - A.P. Sokolenko
- N.N. Petrov Institute of Oncology, Laboratory of Molecular Oncology; St.-Petersburg 197758 Russia
- St.-Petersburg Pediatric Medical University, Department of Medical Genetics; St.-Petersburg 194100 Russia
| | - N.V. Mitiushkina
- N.N. Petrov Institute of Oncology, Laboratory of Molecular Oncology; St.-Petersburg 197758 Russia
| | - E.Sh. Kuligina
- N.N. Petrov Institute of Oncology, Laboratory of Molecular Oncology; St.-Petersburg 197758 Russia
| | - E.N. Suspitsin
- N.N. Petrov Institute of Oncology, Laboratory of Molecular Oncology; St.-Petersburg 197758 Russia
- St.-Petersburg Pediatric Medical University, Department of Medical Genetics; St.-Petersburg 194100 Russia
| | - A.R. Venina
- N.N. Petrov Institute of Oncology, Laboratory of Molecular Oncology; St.-Petersburg 197758 Russia
| | - M.M. Holmatov
- N.N. Petrov Institute of Oncology, Laboratory of Molecular Oncology; St.-Petersburg 197758 Russia
- St.-Petersburg Pediatric Medical University, Department of Medical Genetics; St.-Petersburg 194100 Russia
| | - O.A. Zaitseva
- N.N. Petrov Institute of Oncology, Laboratory of Molecular Oncology; St.-Petersburg 197758 Russia
| | - O.S. Yatsuk
- N.N. Petrov Institute of Oncology, Laboratory of Molecular Oncology; St.-Petersburg 197758 Russia
| | - D.V. Pashkov
- S.M. Kirov Military Medical Academy, Department of Surgery; St.-Petersburg 194044 Russia
| | - A.M. Belyaev
- N.N. Petrov Institute of Oncology, Laboratory of Molecular Oncology; St.-Petersburg 197758 Russia
- S.M. Kirov Military Medical Academy, Department of Surgery; St.-Petersburg 194044 Russia
| | - A.V. Togo
- N.N. Petrov Institute of Oncology, Laboratory of Molecular Oncology; St.-Petersburg 197758 Russia
| | - E.N. Imyanitov
- N.N. Petrov Institute of Oncology, Laboratory of Molecular Oncology; St.-Petersburg 197758 Russia
- St.-Petersburg Pediatric Medical University, Department of Medical Genetics; St.-Petersburg 194100 Russia
- I.I. Mechnikov North-Western Medical University, Department of Oncology; St.-Petersburg 191015 Russia
- St.-Petersburg State University, Faculty of Medicine, Department of Oncology; St.-Petersburg 199034 Russia
| | - A.G. Iyevleva
- N.N. Petrov Institute of Oncology, Laboratory of Molecular Oncology; St.-Petersburg 197758 Russia
- St.-Petersburg Pediatric Medical University, Department of Medical Genetics; St.-Petersburg 194100 Russia
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7
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Kwiatkowski D, Czarny P, Galecki P, Bachurska A, Talarowska M, Orzechowska A, Bobińska K, Bielecka-Kowalska A, Pietras T, Szemraj J, Maes M, Sliwinski T. Variants of Base Excision Repair Genes MUTYH , PARP1 and XRCC1 in Alzheimer's Disease Risk. Neuropsychobiology 2016; 71:176-86. [PMID: 25998844 DOI: 10.1159/000381985] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Accepted: 03/30/2015] [Indexed: 12/12/2022]
Abstract
BACKGROUND Many clinical studies have shown that oxidative stress pathways and the efficiency of the oxidative DNA damage base excision repair (BER) system are associated with the pathogenesis of Alzheimer's disease (AD). Reduced BER efficiency may result from polymorphisms of BER-related genes. In the present study, we examine whether single nucleotide polymorphisms (SNPs) of BER genes are associated with increased risk of AD. METHODS SNP genotyping was carried out on DNA isolated from peripheral blood mononuclear cells obtained from 120 patients with AD and 110 healthy volunteers. Samples were genotyped for the presence of BER-related SNPs, i.e. XRCC1-rs1799782, rs25487; MUTYH-rs3219489, and PARP1-rs1136410. RESULTS We found a positive association between AD risk and the presence of G/A genotype variant of the XRCC1 rs25487 polymorphism [odds ratio (OR) = 3.762, 95% CI: 1.793-7.891]. The presence of the A/A genotype of this polymorphism reduced the risk of AD (OR = 0.485, 95% CI: 0.271-0.870). In cases of the PARP1 gene rs1136410 polymorphism, we observed that the T/C variant increases (OR = 4.159, 95% CI: 1.978-8.745) while the T/T variant reduces risk (OR = 0.240, 95% CI: 0.114-0.556) of AD. CONCLUSIONS We conclude that BER gene polymorphisms may play an important role in the etiology of AD. Diagnosing the presence or absence of particular genetic variants may be an important marker of AD. Further research on a larger population is needed. There is also a need to examine polymorphisms of other BER in the context of AD risk.
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Liu IH, Ford JM, Kunz PL. DNA-repair defects in pancreatic neuroendocrine tumors and potential clinical applications. Cancer Treat Rev 2015; 44:1-9. [PMID: 26924193 DOI: 10.1016/j.ctrv.2015.11.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Revised: 11/18/2015] [Accepted: 11/19/2015] [Indexed: 01/09/2023]
Abstract
BACKGROUND The role of DNA repair in pathogenesis and response to treatment is not well understood in pancreatic neuroendocrine tumors (pNETs). However, the existing literature reveals important preliminary trends and targets in the genetic landscape of pNETs. Notably, pNETs have been shown to harbor defects in the direct reversal MGMT gene and the DNA mismatch repair genes, suggesting that these genes may be strong candidates for further prospective studies. METHODS PubMed searches were conducted for original studies assessing the DNA repair genes MGMT and MMR in pNETs, as well as for PTEN and MEN1, which are not directly DNA repair genes but are involved in DNA repair pathways. Searches were specific to pNETs, yielding five original studies on MGMT and four on MMR. Six original papers studied PTEN in pNETs. Five studied MEN1 in pNETs, and two others implicated MEN1 in DNA repair processes. RESULTS The five studies on MGMT in pNET tumor samples found MGMT loss of between 24% and 51% of tumor samples by IHC staining and between 0% and 40% by promoter hypermethylation, revealing discrepancies in methods assessing MGMT expression as well as potential weaknesses in the correlation between MGMT IHC expression and promoter hypermethylation rates. Four studies on MMR in pNET tumor samples indicated similar ambiguities, as promoter hypermethylation of the MLH1 MMR gene ranged from 0% to 31% of pNETs, while IHC staining revealed loss of MMR genes in between 0% and 36% of pNETs sampled. Studies also indicated that PTEN and MEN1 are commonly mutated or underexpressed genes in pNETs, although frequency of mutation or loss of expression was again variable among different studies. CONCLUSION Further studies are essential in determining a more thorough repertoire of DNA repair defects in pNETs and the clinical significance of these defects. This literature review synthesises the existing knowledge of relevant DNA repair pathways and studies of the specific genes that carry out these repair mechanisms in pNETs.
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Affiliation(s)
| | - James M Ford
- Stanford University School of Medicine, United States
| | - Pamela L Kunz
- Stanford University School of Medicine, 875 Blake Wilbur Drive, Stanford, CA 94305-5826, United States.
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Impaired 8-hydroxyguanine repair activity of MUTYH variant p.Arg109Trp found in a Japanese patient with early-onset colorectal cancer. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2014; 2014:617351. [PMID: 24799981 PMCID: PMC3988950 DOI: 10.1155/2014/617351] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Revised: 02/05/2014] [Accepted: 02/11/2014] [Indexed: 12/13/2022]
Abstract
PURPOSE The biallelic inactivation of the 8-hydroxyguanine repair gene MUTYH leads to MUTYH-associated polyposis (MAP), which is characterized by colorectal multiple polyps and carcinoma(s). However, only limited information regarding MAP in the Japanese population is presently available. Since early-onset colorectal cancer (CRC) is a characteristic of MAP and might be caused by the inactivation of another 8-hydroxyguanine repair gene, OGG1, we investigated whether germline MUTYH and OGG1 mutations are involved in early-onset CRC in Japanese patients. METHODS Thirty-four Japanese patients with early-onset CRC were examined for germline MUTYH and OGG1 mutations using sequencing. RESULTS Biallelic pathogenic mutations were not found in any of the patients; however, a heterozygous p.Arg19∗ MUTYH variant and a heterozygous p.Arg109Trp MUTYH variant were detected in one patient each. The p.Arg19∗ and p.Arg109Trp corresponded to p.Arg5∗ and p.Arg81Trp, respectively, in the type 2 nuclear-form protein. The defective DNA repair activity of p.Arg5∗ is apparent, while that of p.Arg81Trp has been demonstrated using DNA cleavage and supF forward mutation assays. CONCLUSION These results suggest that biallelic MUTYH or OGG1 pathogenic mutations are rare in Japanese patients with early-onset CRC; however, the p.Arg19∗ and p.Arg109Trp MUTYH variants are associated with functional impairments.
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MUTYH-associated colorectal cancer and adenomatous polyposis. Surg Today 2013; 44:593-600. [PMID: 23605219 DOI: 10.1007/s00595-013-0592-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2012] [Accepted: 03/04/2013] [Indexed: 12/28/2022]
Abstract
MUTYH-associated polyposis (MAP) was first described in 2002. MUTYH is a component of a base excision repair system that protects the genomic information from oxidative damage. When the MUTYH gene product is impaired by bi-allelic germline mutation, it leads to the mutation of cancer-related genes, such as the APC and/or the KRAS genes, via G to T transversion. MAP is a hereditary colorectal cancer syndrome inherited in an autosomal-recessive fashion. The clinical features of MAP include the presence of 10-100 adenomatous polyps in the colon, and early onset of colorectal cancer. Ethnic and geographical differences in the pattern of the MUTYH gene mutations have been suggested. In Caucasian patients, c.536A>G (Y179C) and c.1187G>A (G396D) mutations are frequently detected. In the Asian population, Y179C and G396D are uncommon, whereas other variants are suggested to be the major causes of MAP. We herein review the literature on MUTYH-associated colorectal cancer and adenomatous polyposis.
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11
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Mazzei F, Viel A, Bignami M. Role of MUTYH in human cancer. Mutat Res 2013; 743-744:33-43. [PMID: 23507534 DOI: 10.1016/j.mrfmmm.2013.03.003] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2012] [Revised: 03/06/2013] [Accepted: 03/09/2013] [Indexed: 06/01/2023]
Abstract
MUTYH, a human ortholog of MutY, is a post-replicative DNA glycosylase, highly conserved throughout evolution, involved in the correction of mismatches resulting from a faulty replication of the oxidized base 8-hydroxyguanine (8-oxodG). In particular removal of adenine from A:8-oxodG mispairs by MUTYH activity is followed by error-free base excision repair (BER) events, leading to the formation of C:8-oxodG base pairs. These are the substrate of another BER enzyme, the OGG1 DNA glycosylase, which then removes 8-oxodG from DNA. Thus the combined action of OGG1 and MUTYH prevents oxidative damage-induced mutations, i.e. GC->TA transversions. Germline mutations in MUTYH are associated with a recessively heritable colorectal polyposis, now referred to as MUTYH-associated polyposis (MAP). Here we will review the phenotype(s) associated with MUTYH inactivation from bacteria to mammals, the structure of the MUTYH protein, the molecular mechanisms of its enzymatic activity and the functional characterization of MUTYH variants. The relevance of these results will be discussed to define the role of specific human mutations in colorectal cancer risk together with the possible role of MUTYH inactivation in sporadic cancer.
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Affiliation(s)
- Filomena Mazzei
- Department of Environment, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Roma, Italy
| | - Alessandra Viel
- Experimental Oncology 1, Centro di Riferimento Oncologico, IRCCS, Via F.Gallini 2, 33081 Aviano, PN, Italy
| | - Margherita Bignami
- Department of Environment, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Roma, Italy.
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