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Dratwa M, Wysoczanska B, Brankiewicz W, Stachowicz-Suhs M, Wietrzyk J, Matkowski R, Ekiert M, Szelachowska J, Maciejczyk A, Szajewski M, Baginski M, Bogunia-Kubik K. Relationship between Telomere Length, TERT Genetic Variability and TERT, TP53, SP1, MYC Gene Co-Expression in the Clinicopathological Profile of Breast Cancer. Int J Mol Sci 2022; 23:5164. [PMID: 35563554 PMCID: PMC9102200 DOI: 10.3390/ijms23095164] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 04/15/2022] [Accepted: 05/04/2022] [Indexed: 12/11/2022] Open
Abstract
The molecular mechanisms of telomerase reverse transcriptase (TERT) upregulation in breast cancer (BC) are complex. We compared genetic variability within TERT and telomere length with the clinical data of patients with BC. Additionally, we assessed the expression of the TERT, MYC, TP53 and SP1 genes in BC patients and in BC organoids (3D cell cultures obtained from breast cancer tissues). We observed the same correlation in the blood of BC patients and in BC organoids between the expression of TERT and TP53. Only in BC patients was a correlation found between the expression of the TERT and MYC genes and between TP53 and MYC. We found associations between TERT genotypes (rs2735940 and rs10069690) and TP53 expression and telomere length. BC patients with the TT genotype rs2735940 have a shorter telomere length, but patients with A allele rs10069690 have a longer telomere length. BC patients with a short allele VNTR-MNS16A showed higher expression of the SP1 and had a longer telomere. Our results bring new insight into the regulation of TERT, MYC, TP53 and SP1 gene expression related to TERT genetic variability and telomere length. Our study also showed for the first time a similar relationship in the expression of the above genes in BC patients and in BC organoids. These findings suggest that TERT genetic variability, expression and telomere length might be useful biomarkers for BC, but their prognostic value may vary depending on the clinical parameters of BC patients and tumor aggressiveness.
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Affiliation(s)
- Marta Dratwa
- Laboratory of Clinical Immunogenetics and Pharmacogenetics, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, 53-114 Wroclaw, Poland;
| | - Barbara Wysoczanska
- Laboratory of Clinical Immunogenetics and Pharmacogenetics, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, 53-114 Wroclaw, Poland;
| | - Wioletta Brankiewicz
- Department of Pharmaceutical Technology and Biochemistry Faculty of Chemistry, Gdansk University of Technology, 80-233 Gdansk, Poland; (W.B.); (M.B.)
| | - Martyna Stachowicz-Suhs
- Department of Experimental Oncology, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, 53-114 Wroclaw, Poland; (M.S.-S.); (J.W.)
| | - Joanna Wietrzyk
- Department of Experimental Oncology, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, 53-114 Wroclaw, Poland; (M.S.-S.); (J.W.)
| | - Rafał Matkowski
- Breast Unit, Lower Silesian Oncology, Pulmonology and Hematology Center, 53-413 Wroclaw, Poland; (R.M.); (M.E.); (J.S.); (A.M.)
- Department of Oncology, Wroclaw Medical University, 53-413 Wroclaw, Poland
| | - Marcin Ekiert
- Breast Unit, Lower Silesian Oncology, Pulmonology and Hematology Center, 53-413 Wroclaw, Poland; (R.M.); (M.E.); (J.S.); (A.M.)
- Department of Oncology, Wroclaw Medical University, 53-413 Wroclaw, Poland
| | - Jolanta Szelachowska
- Breast Unit, Lower Silesian Oncology, Pulmonology and Hematology Center, 53-413 Wroclaw, Poland; (R.M.); (M.E.); (J.S.); (A.M.)
- Department of Oncology, Wroclaw Medical University, 53-413 Wroclaw, Poland
| | - Adam Maciejczyk
- Breast Unit, Lower Silesian Oncology, Pulmonology and Hematology Center, 53-413 Wroclaw, Poland; (R.M.); (M.E.); (J.S.); (A.M.)
- Department of Oncology, Wroclaw Medical University, 53-413 Wroclaw, Poland
| | - Mariusz Szajewski
- Department of Oncological Surgery, Gdynia Oncology Centre, 81-519 Gdynia, Poland;
- Division of Propaedeutics of Oncology, Medical University of Gdansk, 80-210 Gdansk, Poland
| | - Maciej Baginski
- Department of Pharmaceutical Technology and Biochemistry Faculty of Chemistry, Gdansk University of Technology, 80-233 Gdansk, Poland; (W.B.); (M.B.)
| | - Katarzyna Bogunia-Kubik
- Laboratory of Clinical Immunogenetics and Pharmacogenetics, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, 53-114 Wroclaw, Poland;
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Association of p53 codon 72 polymorphism and hTERT polymorphism (rs2736098) with risk of hepatocellular carcinoma. A pilot study in Egyptian patients. GENE REPORTS 2021. [DOI: 10.1016/j.genrep.2021.101255] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Aziz MA, Jafrin S, Islam MS. Human TERT promoter polymorphism rs2853669 is associated with cancers: an updated meta-analysis. Hum Cell 2021; 34:1066-1081. [PMID: 33743166 DOI: 10.1007/s13577-021-00520-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Accepted: 03/11/2021] [Indexed: 12/24/2022]
Abstract
The polymorphism rs2853669 in the telomerase reverse transcriptase gene (TERT) promoter region is widely investigated for the risk of different cancers. However, previous results remained inconclusive. Thus, we performed this updated meta-analysis to comprehensively evaluate the association between rs2853669 and the susceptibility of human cancer. A systematic literature search via PubMed, EMBASE, Cochrane Library, and Web of Science databases was conducted that produced a total of 19 eligible studies containing 23,085 subjects. The relationship was calculated with the odds ratio (OR) and 95% confidence intervals (CIs). Statistical analyses were performed using the RevMan 5.4 software. The analysis indicated that rs2853669 is associated with an enhanced risk of overall cancer risk. From subgroup analysis, a significantly increased association in five genetic models (p < 0.05) was found among Asians, but no association was observed in Caucasians. Although we did not find any significant correlation between rs2853669 and breast cancer, an increased and statistically significant association was found for both lung cancer and acute myeloid leukemia. We did not find any association in other cancer types during stratified analysis. Our meta-analysis suggests that rs2853669 polymorphism in TERT gene is associated with an increased risk of overall cancer susceptibility, particularly in the Asian population. Moreover, rs2853669 is significantly associated with lung cancer and acute myeloid lymphoma. However, large-scale studies are needed to confirm our findings.
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Affiliation(s)
- Md Abdul Aziz
- Department of Pharmacy, Faculty of Science, Noakhali Science and Technology University, Sonapur, Noakhali, 3814, Bangladesh
| | - Sarah Jafrin
- Department of Pharmacy, Faculty of Science, Noakhali Science and Technology University, Sonapur, Noakhali, 3814, Bangladesh
| | - Mohammad Safiqul Islam
- Department of Pharmacy, Faculty of Science, Noakhali Science and Technology University, Sonapur, Noakhali, 3814, Bangladesh.
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Rohani N, Eslahchi C. Classifying Breast Cancer Molecular Subtypes by Using Deep Clustering Approach. Front Genet 2020; 11:553587. [PMID: 33324444 PMCID: PMC7723873 DOI: 10.3389/fgene.2020.553587] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Accepted: 08/25/2020] [Indexed: 01/07/2023] Open
Abstract
Cancer is a complex disease with a high rate of mortality. The characteristics of tumor masses are very heterogeneous; thus, the appropriate classification of tumors is a critical point in the effective treatment. A high level of heterogeneity has also been observed in breast cancer. Therefore, detecting the molecular subtypes of this disease is an essential issue for medicine that could be facilitated using bioinformatics. This study aims to discover the molecular subtypes of breast cancer using somatic mutation profiles of tumors. Nonetheless, the somatic mutation profiles are very sparse. Therefore, a network propagation method is used in the gene interaction network to make the mutation profiles dense. Afterward, the deep embedded clustering (DEC) method is used to classify the breast tumors into four subtypes. In the next step, gene signature of each subtype is obtained using Fisher's exact test. Besides the enrichment of gene signatures in numerous biological databases, clinical and molecular analyses verify that the proposed method using mutation profiles can efficiently detect the molecular subtypes of breast cancer. Finally, a supervised classifier is trained based on the discovered subtypes to predict the molecular subtype of a new patient. The code and material of the method are available at: https://github.com/nrohani/MolecularSubtypes.
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Affiliation(s)
- Narjes Rohani
- Department of Computer and Data Sciences, Faculty of Mathematics, Shahid Beheshti University, Tehran, Iran
| | - Changiz Eslahchi
- Department of Computer and Data Sciences, Faculty of Mathematics, Shahid Beheshti University, Tehran, Iran.,School of Biological Sciences, Institute for Research in Fundamental Sciences (IPM), Tehran, Iran
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Pandith AA, Wani ZA, Qasim I, Afroze D, Manzoor U, Amin I, Baba SM, Koul A, Anwar I, Mohammad F, Bhat AR, Shah P. Association of strong risk of hTERT gene polymorphic variants to malignant glioma and its prognostic implications with respect to different histological types and survival of glioma cases. J Gene Med 2020; 22:e3260. [PMID: 32783258 DOI: 10.1002/jgm.3260] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 07/03/2020] [Accepted: 07/31/2020] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Germline genetic variants of human telomerase reverse transcriptase (hTERT) are known to predispose for various malignancies, including glioma. The present study investigated genetic variation of hTERT T/G (rs2736100) and hTERT G/A (rs2736098) with respect to glioma risk. METHODS Confirmed cases (n = 106) were tested against 210 cancer-free healthy controls by the polymerase chain reaction-restriction fragment length polymorphism technique for genotyping. RESULTS Homozygous variant 'GG' genotype of rs2736100 frequency was > 4-fold significantly different in cases versus controls (39.6% 17.2%; p < 0.0001). Furthermore, variant 'G' allele was found to be significantly associated with cases (0.5 versus 0.2 in controls; p < 0.0001). Homozygous variant rs2736098 'AA' genotype (35.8% versus 23.8%) and allele 'A' (0.49 versus 0.34) showed a marked significant difference in cases and controls, respectively (p < 0.05). In hTERT rs2736100, the GG genotype significantly presented more in higher grades and GBM (p < 0.0001). Furthermore, the GG variant of hTERT rs2736100 had a poor probability with respect to the overall survival of patients compared to TG and TT genotypes (log rank p = 0.03). Interestingly, two haplotypes of hTERT rs2736100/rs2736098 were identified as GG and GA that conferred a > 3- and 5-fold risk to glioma patients respectively, where variant G/A haplotype was observed to have the highest impact with respect to glioma risk (p < 0.0001). CONCLUSIONS The results of the present study indicate that hTERT rs2736098 and rs2736100 variants play an important role in conferring a strong risk of developing glioma. Furthermore, hTERT rs2736100 GG variant appears to play a role in the bad prognosis of glioma patients. Haplotypes GG and GA could prove to be vital tools for monitoring risk in glioma patients.
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Affiliation(s)
- Arshad A Pandith
- Advanced Centre for Human Genetics, Sher-I-Kashmir Institute of Medical Sciences (SKIMS), Srinagar, Jammu and Kashmir, India
| | - Zahoor A Wani
- Advanced Centre for Human Genetics, Sher-I-Kashmir Institute of Medical Sciences (SKIMS), Srinagar, Jammu and Kashmir, India
| | - Iqbal Qasim
- Advanced Centre for Human Genetics, Sher-I-Kashmir Institute of Medical Sciences (SKIMS), Srinagar, Jammu and Kashmir, India
| | - Dil Afroze
- Advanced Centre for Human Genetics, Sher-I-Kashmir Institute of Medical Sciences (SKIMS), Srinagar, Jammu and Kashmir, India
| | - Usma Manzoor
- Advanced Centre for Human Genetics, Sher-I-Kashmir Institute of Medical Sciences (SKIMS), Srinagar, Jammu and Kashmir, India
| | - Ina Amin
- Advanced Centre for Human Genetics, Sher-I-Kashmir Institute of Medical Sciences (SKIMS), Srinagar, Jammu and Kashmir, India
| | - Shahid M Baba
- Immunology and Molecular Medicine, SKIMS, Srinagar, Jammu and Kashmir, India
| | - Aabid Koul
- Advanced Centre for Human Genetics, Sher-I-Kashmir Institute of Medical Sciences (SKIMS), Srinagar, Jammu and Kashmir, India
| | - Iqra Anwar
- Advanced Centre for Human Genetics, Sher-I-Kashmir Institute of Medical Sciences (SKIMS), Srinagar, Jammu and Kashmir, India
| | - Fozia Mohammad
- Advanced Centre for Human Genetics, Sher-I-Kashmir Institute of Medical Sciences (SKIMS), Srinagar, Jammu and Kashmir, India
| | - Abdul R Bhat
- Department of Neurosurgery, SKIMS, Srinagar, Jammu and Kashmir, India
| | - Parveen Shah
- Department of Pathology, SKIMS, Srinagar, Jammu and Kashmir, India
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Association between TERT gene polymorphisms and acute myeloid leukemia susceptibility in a Chinese population: a case-control study. Cancer Cell Int 2020; 20:313. [PMID: 32694935 PMCID: PMC7364641 DOI: 10.1186/s12935-020-01335-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 06/09/2020] [Indexed: 11/10/2022] Open
Abstract
Background The aim of this study was to investigate the association between telomerase reverse transcriptase (TERT) gene polymorphisms and acute myeloid leukemia (AML) susceptibility in a Chinese Han population. Methods A total of 102 AML patients and 108 healthy controls were enrolled in this case-control study. TERT gene rs2853669 and rs2736100 polymorphisms were genotyped via polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). Chi-square test was applied to compare polymorphism distributions between case and control groups. The strength of the association between TERT gene polymorphisms and AML susceptibility was evaluated utilizing odds ratio (OR) with corresponding 95% confidence interval (CI). Results CC genotype and C allele of rs2736100 polymorphism were more frequent in AML patients (P < 0.05), and individuals carrying CC genotype showed higher risk of suffering from AML (OR = 2.632, 95% CI 1.129-6.133). But for rs2853669 polymorphism, no significant differences were detected in either genotype or allele distributions between groups (P > 0.05). Conclusions This study suggested a positive association between TERT gene rs2736100 polymorphism and AML susceptibility in Chinese Han population.
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Vinothkumar V, Arun K, Arunkumar G, Revathidevi S, Ramani R, Bhaskar LVKS, Murugan AK, Munirajan AK. Association between functional TERT promoter polymorphism rs2853669 and cervical cancer risk in South Indian women. Mol Clin Oncol 2020; 12:485-494. [PMID: 32257207 DOI: 10.3892/mco.2020.2003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Accepted: 07/17/2019] [Indexed: 02/07/2023] Open
Abstract
A single nucleotide polymorphism (SNP) rs2853669 (A>G) in the telomerase reverse transcriptase (TERT) promoter has recently been reported in chr5:1,295,349 T>C (T349C), and was shown to be associated with increased cancer risk and poor survival in a specific population. However, at present, the role of this particular SNP with TERT promoter driver mutations and its genetic association with human papilloma virus (HPV) in patients with cervical cancer has not been determined. In the present study, the genetic association of the functional SNP rs2853669 in the presence/absence of TERT promoter hotspot mutations and HPV in patients with cervical cancer of South Indian origin was evaluated. To understand and compare the frequency of the variant allele and its risk association in different cancer types of various populations, the SNP was genotyped in 257 cervical cancer samples and 295 controls, and its associations with TERT promoter hotspot mutations and HPV were analyzed. Furthermore, an extensive search of previously published articles in PubMed, Embase and Web of Science was conducted; a meta-analysis was carried out to elucidate the association of the SNP with different cancer types in global populations. The SNP analysis showed significantly high frequency (41%) of homozygous variant allele rs2853669 (GG) in patients with cervical cancer compared with control samples [Recessive allele model odds ratio (OR)=1.71; 95% CI=1.20-2.43; P=0.003]. No significant interaction was observed between the TERT SNP rs2853669 and HPV status as well as other hotspot TERT promoter (C228T and C250T) mutations determined in our previous study. In addition, the overall meta-analysis revealed a significant association of the SNP rs2853669 with other cancer types in different ethnic populations (OR=1.09; 95% CI=1.03-1.16; P=0.004). The present results suggested that the TERT SNP rs2853669 could play an important role in the risk of cervical cancer in a South Indian population.
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Affiliation(s)
- Vilvanathan Vinothkumar
- Department of Genetics, Dr ALM Post Graduate Institute of Basic Medical Sciences, University of Madras, Chennai, Tamil Nadu 600113, India
| | - Kanagaraj Arun
- Department of Genetics, Dr ALM Post Graduate Institute of Basic Medical Sciences, University of Madras, Chennai, Tamil Nadu 600113, India
| | - Ganesan Arunkumar
- Department of Genetics, Dr ALM Post Graduate Institute of Basic Medical Sciences, University of Madras, Chennai, Tamil Nadu 600113, India
| | - Sundaramoorthy Revathidevi
- Department of Genetics, Dr ALM Post Graduate Institute of Basic Medical Sciences, University of Madras, Chennai, Tamil Nadu 600113, India
| | - Rajendren Ramani
- Institute of Social Obstetrics and Government Kasturba Gandhi Hospital for Women and Children, Chennai, Tamil Nadu 600005, India
| | | | - Avaniyapuram Kannan Murugan
- Department of Molecular Oncology, King Faisal Specialist Hospital and Research Centre, Riyadh 11211, Kingdom of Saudi Arabia
| | - Arasambattu Kannan Munirajan
- Department of Genetics, Dr ALM Post Graduate Institute of Basic Medical Sciences, University of Madras, Chennai, Tamil Nadu 600113, India
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Zhou X, Wei W, Duan X, Zhang H, Feng X, Wang T, Wang P, Ding M, Liu S, Li L, Yao W, Wang Q, Acquaye RM, Liang H, Wang W, Yang Y. Effect of TRF1 rs3863242 polymorphism on telomere length in omethoate-exposed workers. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2020; 55:525-529. [PMID: 32077369 DOI: 10.1080/03601234.2020.1728167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Telomere length was found to be associated with omethoate exposure and polymorphisms in certain genes among occupational workers. However, whether the polymorphisms in telomere-binding protein genes influence telomere length remains unclear. To explore the correlation between telomere length and polymorphisms in telomere-binding protein genes, telomere length in peripheral blood leukocytes was determined by real-time quantitative polymerase chain reaction in 180 omethoate-exposed workers and 115 healthy controls. Polymorphisms in 10 pairs of alleles were detected using flight mass spectrometry or polymerase chain reaction-restriction fragment length polymorphism technique. The results showed that individuals with GG genotype in TRF1 rs3863242 had longer telomere lengths than those with AG + AA genotype in the control group (p = 0.005). The multiple regression analysis suggested that both omethoate exposure (b = 0.526, p < 0.001) and TRF1 rs3863242 GG (b = 0.220, p = 0.002) were related to a longer telomere length. In conclusion, GG genotype in TRF1 rs3863242 is linked to prolongation of telomere length, and individuals with GG genotype are recommended to strengthen health protection in a Chinese occupational omethoate-exposed population.
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Affiliation(s)
- Xiaoshan Zhou
- Department of Occupational health and occupational diseases, College of Public Health, Zhengzhou University, Zhengzhou, Henan, China
| | - Wan Wei
- Department of Occupational health and occupational diseases, College of Public Health, Zhengzhou University, Zhengzhou, Henan, China
| | - Xiaoran Duan
- Department of Occupational health and occupational diseases, College of Public Health, Zhengzhou University, Zhengzhou, Henan, China
| | - Hui Zhang
- Department of Occupational health and occupational diseases, College of Public Health, Zhengzhou University, Zhengzhou, Henan, China
| | - Xiaolei Feng
- Department of Occupational health and occupational diseases, College of Public Health, Zhengzhou University, Zhengzhou, Henan, China
| | - Tuanwei Wang
- Department of Occupational health and occupational diseases, College of Public Health, Zhengzhou University, Zhengzhou, Henan, China
| | - Pengpeng Wang
- Department of Occupational health and occupational diseases, College of Public Health, Zhengzhou University, Zhengzhou, Henan, China
| | - Mingcui Ding
- Department of Occupational health and occupational diseases, College of Public Health, Zhengzhou University, Zhengzhou, Henan, China
| | - Suxiang Liu
- Clinical Department, Zhengzhou Institute of Occupational Health, Zhengzhou, Henan, China
| | - Lei Li
- Clinical Department, Zhengzhou Institute of Occupational Health, Zhengzhou, Henan, China
| | - Wu Yao
- Department of Occupational health and occupational diseases, College of Public Health, Zhengzhou University, Zhengzhou, Henan, China
| | - Qi Wang
- Department of Occupational health and occupational diseases, College of Public Health, Zhengzhou University, Zhengzhou, Henan, China
| | - Reuben Mensah Acquaye
- Department of Occupational health and occupational diseases, College of Public Health, Zhengzhou University, Zhengzhou, Henan, China
| | - Haiyong Liang
- BioMiao Biological Technology Co., Ltd, Beijing, China
| | - Wei Wang
- Department of Occupational health and occupational diseases, College of Public Health, Zhengzhou University, Zhengzhou, Henan, China
- The Key Laboratory of Nanomedicine and Health Inspection of Zhengzhou, Zhengzhou, Henan, China
| | - Yongli Yang
- Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, Zhengzhou, Henan, China
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Anitha A, Thanseem I, Vasu MM, Viswambharan V, Poovathinal SA. Telomeres in neurological disorders. Adv Clin Chem 2019; 90:81-132. [PMID: 31122612 DOI: 10.1016/bs.acc.2019.01.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Ever since their discovery, the telomeres and the telomerase have been topics of intensive research, first as a mechanism of cellular aging and later as an indicator of health and diseases in humans. By protecting the chromosome ends, the telomeres play a vital role in preserving the information in our genome. Telomeres shorten with age and the rate of telomere erosion provides insight into the proliferation history of cells. The pace of telomere attrition is known to increase at the onset of several pathological conditions. Telomere shortening has been emerging as a potential contributor in the pathogenesis of several neurological disorders including autism spectrum disorders (ASD), schizophrenia, Alzheimer's disease (AD), Parkinson's disease (PD) and depression. The rate of telomere attrition in the brain is slower than that of other tissues owing to the low rate of cell proliferation in brain. Telomere maintenance is crucial for the functioning of stem cells in brain. Taking together the studies on telomere attrition in various neurological disorders, an association between telomere shortening and disease status has been demonstrated in schizophrenia, AD and depression, in spite of a few negative reports. But, studies in ASD and PD have failed to produce conclusive results. The cause-effect relationship between TL and neurological disorders is yet to be elucidated. The factors responsible for telomere erosion, which have also been implicated in the pathogenesis of neurological disorders, need to be explored in detail. Telomerase activation is now being considered as a potential therapeutic strategy for neurological disorders.
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Affiliation(s)
- Ayyappan Anitha
- Institute for Communicative and Cognitive Neurosciences (ICCONS), Palakkad, Kerala, India.
| | - Ismail Thanseem
- Institute for Communicative and Cognitive Neurosciences (ICCONS), Palakkad, Kerala, India
| | - Mahesh Mundalil Vasu
- Institute for Communicative and Cognitive Neurosciences (ICCONS), Palakkad, Kerala, India
| | - Vijitha Viswambharan
- Institute for Communicative and Cognitive Neurosciences (ICCONS), Palakkad, Kerala, India
| | - Suresh A Poovathinal
- Institute for Communicative and Cognitive Neurosciences (ICCONS), Palakkad, Kerala, India
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Feky SEE, Ibrahim FA, Haroun M, Ahmmad MAR, Elnaggar M, Elghandour S, Moneim NAAE. Genetic Variation of <i>hTERT</i>, Leukocyte Telomere Length and the Risk of Breast Cancer: A Case-Control Study in Egyptian Females. ADVANCES IN BREAST CANCER RESEARCH 2019; 08:61-76. [DOI: 10.4236/abcr.2019.82005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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Bagherpour M, Gharibzad K, Rassi H. Association of CDH1 and TERT Single-Nucleotide Polymorphisms with Susceptibility to Familial Breast Cancer Risk. Monoclon Antib Immunodiagn Immunother 2018; 37:239-244. [PMID: 30543312 DOI: 10.1089/mab.2018.0017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Breast cancer (BC) is a multistep disease that is thought to result from an interaction between genetic background and environmental factors. In Iran, one of the strongest risk factors for developing BC is a positive family history of the disease. Recently, various polymorphisms of E-cadherin (CDH1) and TERT have been found to be associated with increased BC risk worldwide. This study aimed to analyze the association of CDH1 and TERT single-nucleotide polymorphisms with susceptibility to familial BC (FBC) risk in the Iranian patients. One hundred five patients with FBC and 110 non-FBC (NFBC) were genotyped to elucidate the potential association between CDH1 rs5030625 polymorphism and TERT rs2736098 polymorphism by polymerase chain reaction-restriction fragment length polymorphism. Then, results were evaluated by electrophoresis and Epi Info(™) 2012 software. A significant association was found between CDH1 rs5030625 GAGA genotype and FBC risk. Compared with the control group, the FBC patients had a lower frequency of GG genotype (69% vs. 85%) and a higher frequency of GAGA (5% vs. 2%, P < 0.02). Furthermore, the patients with FBC had a lower frequency of TERT rs2736098 GG genotype (38% vs. 49%, P = 0.001) and a higher frequency of rs2736098 AA genotype (12% vs. 5%, P = 0.001) compared with the NFBC. In contrast, the TERT rs2736098 GG genotype potentially increased the recurring risk of FBC (odds ratio = 3.17, P < 0.01). Allele genotypic frequencies in the FBC patients differed from those of the controls. Interestingly, tumors in FBC patients with rs2736098 GG genotype and rs5030625 GAGA exhibited higher mitotic activity, higher grade, lower estrogen receptor, and progesterone receptor than the other genotypes. In conclusion, CDH1 rs5030625 GAGA genotype and TERT rs2736098 GG genotype in combination with clinical parameters may be prognostic factors rather than susceptibility factors during the progression of FBC.
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Affiliation(s)
- Mahsa Bagherpour
- Department of Biology, Karaj Branch, Islamic Azad University , Karaj, Iran
| | - Kamelia Gharibzad
- Department of Biology, Karaj Branch, Islamic Azad University , Karaj, Iran
| | - Hossein Rassi
- Department of Biology, Karaj Branch, Islamic Azad University , Karaj, Iran
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Gaspar TB, Sá A, Lopes JM, Sobrinho-Simões M, Soares P, Vinagre J. Telomere Maintenance Mechanisms in Cancer. Genes (Basel) 2018; 9:E241. [PMID: 29751586 PMCID: PMC5977181 DOI: 10.3390/genes9050241] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Revised: 04/20/2018] [Accepted: 04/23/2018] [Indexed: 12/12/2022] Open
Abstract
Tumour cells can adopt telomere maintenance mechanisms (TMMs) to avoid telomere shortening, an inevitable process due to successive cell divisions. In most tumour cells, telomere length (TL) is maintained by reactivation of telomerase, while a small part acquires immortality through the telomerase-independent alternative lengthening of telomeres (ALT) mechanism. In the last years, a great amount of data was generated, and different TMMs were reported and explained in detail, benefiting from genome-scale studies of major importance. In this review, we address seven different TMMs in tumour cells: mutations of the TERT promoter (TERTp), amplification of the genes TERT and TERC, polymorphic variants of the TERT gene and of its promoter, rearrangements of the TERT gene, epigenetic changes, ALT, and non-defined TMM (NDTMM). We gathered information from over fifty thousand patients reported in 288 papers in the last years. This wide data collection enabled us to portray, by organ/system and histotypes, the prevalence of TERTp mutations, TERT and TERC amplifications, and ALT in human tumours. Based on this information, we discuss the putative future clinical impact of the aforementioned mechanisms on the malignant transformation process in different setups, and provide insights for screening, prognosis, and patient management stratification.
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Affiliation(s)
- Tiago Bordeira Gaspar
- Cancer Signaling and Metabolism Group, Institute for Research and Innovation in Health Sciences (i3S), University of Porto, 4200-135 Porto, Portugal.
- Cancer Signaling and Metabolism Group, Institute of Molecular Pathology and Immunology of the University of Porto (Ipatimup), 4200-135 Porto, Portugal.
- Medical Faculty of University of Porto (FMUP), 4200-139 Porto, Portugal.
- Abel Salazar Biomedical Sciences Institute (ICBAS), University of Porto, 4050-313 Porto, Portugal.
| | - Ana Sá
- Cancer Signaling and Metabolism Group, Institute for Research and Innovation in Health Sciences (i3S), University of Porto, 4200-135 Porto, Portugal.
- Cancer Signaling and Metabolism Group, Institute of Molecular Pathology and Immunology of the University of Porto (Ipatimup), 4200-135 Porto, Portugal.
- Abel Salazar Biomedical Sciences Institute (ICBAS), University of Porto, 4050-313 Porto, Portugal.
| | - José Manuel Lopes
- Cancer Signaling and Metabolism Group, Institute for Research and Innovation in Health Sciences (i3S), University of Porto, 4200-135 Porto, Portugal.
- Cancer Signaling and Metabolism Group, Institute of Molecular Pathology and Immunology of the University of Porto (Ipatimup), 4200-135 Porto, Portugal.
- Medical Faculty of University of Porto (FMUP), 4200-139 Porto, Portugal.
- Department of Pathology and Oncology, Centro Hospitalar São João, 4200-139 Porto, Portugal.
| | - Manuel Sobrinho-Simões
- Cancer Signaling and Metabolism Group, Institute for Research and Innovation in Health Sciences (i3S), University of Porto, 4200-135 Porto, Portugal.
- Cancer Signaling and Metabolism Group, Institute of Molecular Pathology and Immunology of the University of Porto (Ipatimup), 4200-135 Porto, Portugal.
- Medical Faculty of University of Porto (FMUP), 4200-139 Porto, Portugal.
- Department of Pathology and Oncology, Centro Hospitalar São João, 4200-139 Porto, Portugal.
| | - Paula Soares
- Cancer Signaling and Metabolism Group, Institute for Research and Innovation in Health Sciences (i3S), University of Porto, 4200-135 Porto, Portugal.
- Cancer Signaling and Metabolism Group, Institute of Molecular Pathology and Immunology of the University of Porto (Ipatimup), 4200-135 Porto, Portugal.
- Abel Salazar Biomedical Sciences Institute (ICBAS), University of Porto, 4050-313 Porto, Portugal.
| | - João Vinagre
- Cancer Signaling and Metabolism Group, Institute for Research and Innovation in Health Sciences (i3S), University of Porto, 4200-135 Porto, Portugal.
- Cancer Signaling and Metabolism Group, Institute of Molecular Pathology and Immunology of the University of Porto (Ipatimup), 4200-135 Porto, Portugal.
- Medical Faculty of University of Porto (FMUP), 4200-139 Porto, Portugal.
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Zhou M, Jiang B, Xiong M, Zhu X. Association Between TERT rs2736098 Polymorphisms and Cancer Risk-A Meta-Analysis. Front Physiol 2018; 9:377. [PMID: 29695979 PMCID: PMC5905241 DOI: 10.3389/fphys.2018.00377] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Accepted: 03/27/2018] [Indexed: 12/16/2022] Open
Abstract
Background: Cancer remains a leading cause of death and constitutes an enormous burden on society worldwide. The association between the human telomerase reverse transcriptase (TERT) gene variant rs2736098 polymorphisms and cancer predisposition remain inconclusive. Objective and methods: Databases including Pubmed and Embase were systematically searched from inception to September 15, 2017 to retrieve studies investigating the association between the TERT variant rs2736098 polymorphisms and cancer risk in accordance with previously determined exclusion and inclusion criteria. The pooled odds ratios (ORs) and corresponding 95% confidence intervals (CIs) were evaluated using random or fixed effects models. Results: Thirty-one case-control studies from 29 articles with 15,837 cases and 19,263 controls were screened out after a systematic search. Pooled analysis demonstrated that the TERT variant rs2736098 G > A polymorphism was significantly correlated with cancer risk in all populations (A vs. G: OR = 1.134, 95% CI = 1.051-1.224, P = 0.001; AA vs. GG: OR = 1.280, 95% CI = 1.087-1.508, P = 0.003; GA vs. GG: OR = 1.125, 95% CI = 1.020-1.240, P = 0.018; GA/AA vs. GG: OR = 1.159, 95% CI = 1.047-1.283, P = 0.004). In the subgroup analysis based on cancer type, the TERT rs2736098 with the A allele was 1.299 times more frequent than that with the G allele (OR = 1.299, 95% CI = 1.216-1.386) under the allelic genetic model in lung cancer, and 1.152 times (OR = 1.152, 95% CI = 1.032-1.286) that in bladder cancer. Conclusions: This meta-analysis demonstrated significant correlations between the TERT variant rs2736098 polymorphisms and cancer susceptibility. The A allele in the rs2736098 G > A polymorphism contributes to susceptibility in many types of cancer, especially lung cancer and bladder cancer.
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Affiliation(s)
- Mi Zhou
- Department of Respiratory Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Bo Jiang
- Department of Urology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Mao Xiong
- Department of Urology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Xin Zhu
- Department of Urology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
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Integrated analysis of promoter methylation and expression of telomere related genes in breast cancer. Oncotarget 2018; 8:25442-25454. [PMID: 28424414 PMCID: PMC5421942 DOI: 10.18632/oncotarget.16036] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Accepted: 02/07/2017] [Indexed: 11/25/2022] Open
Abstract
Telomeres at the ends of eukaryotic chromosomes play a critical role in tumorgenesis. Using microfluidic PCR and next-generation bisulfite sequencing technology, we investigated the promoter methylation of 29 telomere related genes in paired tumor and normal tissues from 184 breast cancer patients. The expression of significantly differentially methylated genes was quantified using qPCR method.We observed that the average methylation level of the 29 telomere related genes was significant higher in tumor than that in normal tissues (P = 4.30E-21). A total of 4 genes (RAD50, RTEL, TERC and TRF1) showed significant hyper-methylation in breast tumor tissues. RAD51D showed significant methylation difference among the four breast cancer subtypes. The methylation of TERC showed significant association with ER status of breast cancer. The expression profiles of the 4 hyper-methylated genes showed significantly reduced expression in tumor tissues. The integration analysis of methylation and expression of these 4 genes showed a good performance in breast cancer prediction (AUC = 0.947).Our results revealed the methylation pattern of telomere related genes in breast cancer and suggested a novel 4-gene panel might be a valuable biomarker for breast cancer diagnosis.
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Liu Z, Wang T, Wu Z, Zhang K, Li W, Yang J, Chen C, Chen L, Xing J. Association between TERT rs2853669 polymorphism and cancer risk: A meta-analysis of 9,157 cases and 11,073 controls. PLoS One 2018. [PMID: 29534075 PMCID: PMC5849304 DOI: 10.1371/journal.pone.0191560] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Background It has been reported that the functional telomerase reverse transcriptase (TERT) rs2853669 polymorphism might contribute to different types of human cancer. However, the association of this mutation with cancer remains controversial. Here, we conducted a meta-analysis to characterize this relationship. Materials and methods/Main results A systematic search of studies on the association of TERT rs2853669 polymorphism with all types of cancer was conducted in PubMed, Embase and Cochrane Library. The summary odds ratios (ORs) and corresponding 95% confidence intervals (95% CIs) were used to pool the effect size in a fixed-effects model or a random-effects model where appropriate. A total of 13 articles and 15 case-control studies, including 9,157 cases and 11,073 controls, were included in this meta-analysis. Overall, the pooled results indicated that the rs2853669 polymorphism was significantly associated with increased cancer risk in a homozygote comparison model (CT vs. TT: OR = 1.085, 95% CI: 1.015–1.159, P = 0.016). In the stratified analyses, a significant increased cancer risk was observed in Asian, but not Caucasian patients. A subgroup analysis by cancer type also revealed a significant increase in the risk of lung cancer, but not breast cancer. Conclusions The results of this meta-analysis suggest that the TERT rs2853669 polymorphism is associated with a significantly increased risk of cancer, particularly lung cancer, in Asian populations.
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Affiliation(s)
- Zhengsheng Liu
- Department of Urology, The First Affiliated Hospital of Xiamen University, Xiamen, Fujian, China
- The First Clinical Medical College of Fujian Medical University, Fuzhou, China
| | - Tao Wang
- Department of Urology, The First Affiliated Hospital of Xiamen University, Xiamen, Fujian, China
| | - Zhun Wu
- Department of Urology, The First Affiliated Hospital of Xiamen University, Xiamen, Fujian, China
| | - Kaiyan Zhang
- Department of Urology, The First Affiliated Hospital of Xiamen University, Xiamen, Fujian, China
| | - Wei Li
- Department of Urology, The First Affiliated Hospital of Xiamen University, Xiamen, Fujian, China
| | - Jianbin Yang
- Department of Urology, The First Affiliated Hospital of Xiamen University, Xiamen, Fujian, China
- The First Clinical Medical College of Fujian Medical University, Fuzhou, China
| | - Chenxi Chen
- Department of Urology, The First Affiliated Hospital of Xiamen University, Xiamen, Fujian, China
- The First Clinical Medical College of Fujian Medical University, Fuzhou, China
| | - Lei Chen
- Zhuxi People Hospital, Hubei, China
| | - Jinchun Xing
- Department of Urology, The First Affiliated Hospital of Xiamen University, Xiamen, Fujian, China
- * E-mail:
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16
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Pang T, Zhou M, Liu R, Luo J, Xia R. TERT rs2736098 (Ex2-659G>A) polymorphism and cancer susceptibility: evidence from a comprehensive meta-analysis. Oncotarget 2017; 8:96433-96441. [PMID: 29221218 PMCID: PMC5707112 DOI: 10.18632/oncotarget.21703] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Accepted: 09/20/2017] [Indexed: 02/07/2023] Open
Abstract
Increasing researches have been performed regarding the relationship between TERT rs2736098 and cancer risk, but no consensus has been reached about the relationship. Here, we conducted this updated meta-analysis, aiming to comprehensively evaluate the role of TERT rs2736098 in cancer risk. We systematically searched potential relevant articles through PubMed, EMBASE, CNKI, and WanFang database before August 2017. A total of 33 studies with 18685 cases and 23820 controls were finally included in the current meta-analysis. We then adopted odds ratios (ORs) and 95% confidence intervals (CIs) to analyze the contributions of TERT rs2736098 to cancer risk. We found that the TERT rs2736098 polymorphism was associated with risk of cancer in overall analysis (AA vs. GG: OR = 1.26, 95% CI = 1.09–1.47; AA vs. AG/GG: OR = 1.22, 95% CI = 1.09–1.36; AA/AG vs. GG: OR = 1.13, 95% CI = 1.02–1.24; A vs. G: OR = 1.11, 95% CI = 1.04–1.20). Furthermore, in analysis stratified by cancer type, ethnicity, control source, quality score, and Hardy-Weinberg equilibrium (HWE) in controls, we found increased risk of cancer among lung cancer, bladder cancer, breast cancer, colorectal cancer, other cancers, Asians, hospital-based subgroup, score > 9 group, as well as controls agreement with HWE group. Despite some limitations, the current meta-analysis represented the largest and the most comprehensive investigations, with the strongest conclusion than ever before. To further explicit the association between TERT rs2736098 and cancer risk, more well-design case-control studies with larger sample size are warranted in the future.
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Affiliation(s)
- Tingyuan Pang
- Department of Pharmacy, Affiliated Cancer Hospital & Institute of Guangzhou Medical University, Guangzhou City, 510000, P.R. China
| | - Minjie Zhou
- Department of Kidney Transplantation, Nanfang Hospital, Southern Medical University, Guangzhou City, 510000, P.R. China
| | - Rumin Liu
- Department of Kidney Transplantation, Nanfang Hospital, Southern Medical University, Guangzhou City, 510000, P.R. China
| | - Jia Luo
- Department of Kidney Transplantation, Nanfang Hospital, Southern Medical University, Guangzhou City, 510000, P.R. China
| | - Renfei Xia
- Department of Kidney Transplantation, Nanfang Hospital, Southern Medical University, Guangzhou City, 510000, P.R. China
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Association between rs2853669 in TERT gene and the risk and prognosis of human cancer: a systematic review and meta-analysis. Oncotarget 2017; 8:50864-50872. [PMID: 28881610 PMCID: PMC5584211 DOI: 10.18632/oncotarget.15140] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Accepted: 01/09/2017] [Indexed: 12/11/2022] Open
Abstract
The polymorphism rs2853669 within the promoter of telomerase reverse transcriptase gene (TERTp) has been debated about its role in cancer risk and prognosis. Additionally, several studies report inconsistent results concerning the modifying effect of rs2853669 on the prognostic value of TERTp mutations in cancer patients. Here, we performed this meta-analysis to comprehensively evaluate the role of rs2853669 in the risk and prognosis of human cancer, and further assess its modifying impact on TERTp mutations in the survival of cancer patients. We systematically searched literature via PubMed, Web of Science, and EMBASE through July 2016, and included 22 eligible studies. The overall analysis (64,119 cases and 78,988 controls) demonstrated that rs2853669 did not increase or decrease the overall cancer risk. Subsequent analyses also did not reveal any association between rs2853669 and overall cancer prognosis. However, we identified a modifying effect of rs2853669 on TERTp mutations in that, among cancer patients with TERTp mutations, only those carrying the TT genotype had a poor survival (Hazard ratio = 1.56, 95% confidence interval = 1.06-2.28); subgroup analyses by cancer type also supported these results. In conclusion, our findings suggest that rs2853669 could be important for assessing the prognostic value of TERTp mutations. Future large studies are required to further validate our results.
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Oztas E, Kara H, Kara ZP, Aydogan MU, Uras C, Ozhan G. Association Between Human Telomerase Reverse Transcriptase Gene Variations and Risk of Developing Breast Cancer. Genet Test Mol Biomarkers 2016; 20:459-64. [PMID: 27336831 DOI: 10.1089/gtmb.2015.0339] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Despite a reduction in the number of deaths from cancers made possible by the development of early detection tests, improvements in treatment, changes in the age distribution of the population, and changes of personal behaviors as a result of awareness, breast cancer remains a major health problem worldwide. Breast cancer is the most common cancer and second leading cause of cancer death in women. Several genetic and environmental factors are known to be involved in breast cancer pathogenesis, but its exact etiology is complicated and is not clearly identified. The structure and integrity of telomeres are pivotal for genome stability, and telomere length is maintained by the expression of the telomerase enzyme. The human telomerase reverse transcriptase (hTERT) gene is a principal functional subunit of the telomerase. Several recent studies have provided evidence that hTERT gene variants may have an important role in cancer development. METHODS Three hTERT variants (rs2736100, rs2736098, and rs2853669) were genotyped for 107 breast cancer patients and 110 healthy controls to determine their effect on breast cancer susceptibility. RESULTS It was observed that hTERT rs2736098 was associated with breast cancer risk (odds ratio [OR] = 1.88; p = 0.034), while rs2736100 and rs2853669 did not significantly differ between the groups. CONCLUSIONS These findings are the first description of hTERT allele distributions in the Turkish population and may contribute to our understanding of breast cancer development. Nevertheless, further large-scale population studies are needed to understand the role of the hTERT polymorphisms and haplotypes in the development of breast cancer.
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Affiliation(s)
- Ezgi Oztas
- 1 Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Istanbul University , Istanbul, Turkey
| | - Halil Kara
- 2 Department of General Surgery, Faculty of Medicine, Acibadem University , Istanbul, Turkey
| | - Zeliha Pala Kara
- 3 Department of Pharmacology, Faculty of Pharmacy, Istanbul University , Istanbul, Turkey
| | - Manolya Uras Aydogan
- 4 Department of Physiology, Cerrahpasa Medical Faculty, Istanbul University , Istanbul, Turkey
| | - Cihan Uras
- 2 Department of General Surgery, Faculty of Medicine, Acibadem University , Istanbul, Turkey
| | - Gul Ozhan
- 1 Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Istanbul University , Istanbul, Turkey
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TERT promoter mutations and polymorphisms as prognostic factors in primary glioblastoma. Oncotarget 2016; 6:16663-73. [PMID: 26143636 PMCID: PMC4599297 DOI: 10.18632/oncotarget.4389] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Accepted: 06/12/2015] [Indexed: 01/16/2023] Open
Abstract
Telomerase reverse transcriptase (TERT) activity is up-regulated in several types of tumors including glioblastoma (GBM). In the present study, 128 primary glioblastoma patients were examined for single nucleotide polymorphisms of TERT in blood and in 92 cases for TERT promoter mutations in tumors. TERT promoter mutations were observed in 86% of the tumors and of these, C228T (-124 bp upstream start codon) was detected in 75% and C250T (-146 bp) in 25% of cases. TERT promoter mutations were associated with shorter overall survival (11 vs. 20 months p = 0.002 and 12 vs. 20, p = 0.04 for C228T and C250T, respectively). The minor alleles of rs2736100 and rs10069690 SNP's, located in intron 2 and the promotor regions, respectively, were associated with an increased risk of developing GBM (p = 0.004 and 0.001). GBM patients having both TERT promoter mutations and being homozygous carriers of the rs2853669 C-allele displayed significantly shorter overall survival than those with the wild type allele. The rs2853669 SNP is located in a putative Ets2 binding site in the promoter (-246 bp upstream start codon) close to the C228T and C250T mutation hot spots. Interleukin-6 (IL-6) expression regulated by TERT promoter status and polymorphism, what leads us to think that TERT and IL-6 plays a significant role in GBM, where specific SNPs increase the risk of developing GBM while the rs2853669 SNP and specific mutations in the TERT promoter of the tumor lead to shorter survival.
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Polymorphisms in human telomerase reverse transcriptase (hTERT) gene and susceptibility to gastric cancer in a Turkish population: Hospital-based case-control study. Gene 2016; 585:84-92. [PMID: 27016301 DOI: 10.1016/j.gene.2016.03.030] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2016] [Accepted: 03/19/2016] [Indexed: 12/19/2022]
Abstract
Erosion of telomeres, tandem nucleotide repeats (TTAGGG)n that cap the end of eukaryotic chromosomes, has been related with carcinogenesis. The human telomerase reverse transcriptase (hTERT) gene is encoded the rate-limiting catalytic subunit of the telomerase complexes, which is essential for the protection of telomeric DNA length and chromosomal stability. The purpose of this study was to examine the effect of four functional single nucleotide polymorphisms (SNPs) of hTERT (rs2736109 G>A, rs2735940 T>C, rs2853669 A>G and rs2736100 T>G) on susceptibility to gastric cancer (GC) in Turkish population. The genotype frequency of hTERT rs2736109 G>A, rs2735940 T>C, rs2853669 A>G and rs2736100 T>G polymorphisms were determined by using a polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) and TaqMan methods in 104 subjects with GC and 209 healthy control subjects. We found that hTERT rs2736109 G>A (AA+AG vs. GG OR=1.68 95% CI=1.01-2.81, P=0.04), rs2735940 T>C (CC vs. CT+TT: OR=2.53 95% CI=1.01-6.13, P=0.03), and rs2736100 T>G (TT vs. TG+GG: OR=2.27 95% CI=1.23-4.17, P=0.006) polymorphisms were associated with risk of GC. In the haplotype analysis, hTERT Grs2736109/Trs2735940/Ars2853669/Grs2736100 haplotype was also related with an increased risk of GC (OR=1.75; 95% CI: 1.05-2.93, P=0.03). Because this is the first study regarding the hTERT rs2736109 G>A, rs2735940 T>C, rs2853669 A>G and rs2736100 T>G polymorphisms and the risk of GC susceptibility in the literature, further independent studies are needed to verify our results in a larger sample sizes, as well as in patients of different populations.
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Carkic J, Nikolic N, Radojevic-Skodric S, Kuzmanovic-Pficer J, Brajovic G, Antunovic M, Milasin J, Popovic B. The role of TERT-CLPTM1L SNPs, hTERT expression and telomere length in the pathogenesis of oral squamous cell carcinoma. J Oral Sci 2016; 58:449-458. [DOI: 10.2334/josnusd.16-0108] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Affiliation(s)
- Jelena Carkic
- Institute of Human Genetics, School of Dental Medicine, University of Belgrade
| | - Nadja Nikolic
- Institute of Human Genetics, School of Dental Medicine, University of Belgrade
| | | | - Jovana Kuzmanovic-Pficer
- Department for Medical Statistics and Informatics, School of Dental Medicine, University of Belgrade
| | - Gavrilo Brajovic
- Department of Physiology, School of Dental Medicine, University of Belgrade
| | - Marija Antunovic
- Clinic of Oral Surgery, School of Medicine, University of Montenegro
| | - Jelena Milasin
- Institute of Human Genetics, School of Dental Medicine, University of Belgrade
| | - Branka Popovic
- Institute of Human Genetics, School of Dental Medicine, University of Belgrade
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Yang Z, Zhang X, Fang S, Tan Y, Yan H, Gu W, Wang J. Increased risk of developing lung cancer in Asian patients carrying the TERT rs2736098 G>A polymorphism: evidence from 3,354 cases and 3,518 controls. Onco Targets Ther 2015; 8:2757-65. [PMID: 26491349 PMCID: PMC4599062 DOI: 10.2147/ott.s87534] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND The association between telomerase reverse transcriptase (TERT) rs2736098 G>A and risk of lung cancer (LC) remains inconclusive. To explore the association more precisely, we performed a comprehensive search and conducted a meta-analysis on all eligible case-control studies involving 3,354 cases and 3,518 controls. METHODS The 95% confidence interval (95% CI) and the pooled odds ratio (OR) were calculated using a random or fixed effect model. Publication bias, heterogeneity, and sensitivity analysis were also explored. RESULTS All studies were case-control studies on LC in patients of Asian descent, consisting of one Korean study and five Chinese studies. Overall, the variant A allele of TERT rs2736098 G>A was found to significantly increase the risk of LC in all genetic models (GA vs GG: OR =1.13, 95% CI =1.02-1.25, P=0.017; AA vs GG: OR =1.78, 95% CI =1.53-2.07, P<0.001; GA/AA vs GG: OR =1.25, 95% CI =1.14-1.38, P<0.001; AA vs GA/GG OR =1.66, 95% CI =1.45-1.92, P<0.001). In the subgroup analysis, significant associations were found in Chinese group and hospital-based studies. Different genotype test methods showed no influence on the final results. CONCLUSION Our study identified that TERT rs2736098 G>A polymorphism significantly increased the risk of LC in Asian populations.
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Affiliation(s)
- Zhenhua Yang
- Department of Pneumology, Nanjing First Hospital, Nanjing Medical University, Nanjing, People’s Republic of China
| | - Xunlei Zhang
- Department of Medical Oncology, Nantong University Affiliated Tumor Hospital, Nantong, People’s Republic of China
| | - Surong Fang
- Department of Pneumology, Nanjing First Hospital, Nanjing Medical University, Nanjing, People’s Republic of China
| | - Yan Tan
- Department of Pneumology, Nanjing First Hospital, Nanjing Medical University, Nanjing, People’s Republic of China
| | - Haijun Yan
- Department of Pneumology, Nanjing First Hospital, Nanjing Medical University, Nanjing, People’s Republic of China
| | - Wei Gu
- Department of Pneumology, Nanjing First Hospital, Nanjing Medical University, Nanjing, People’s Republic of China
| | - Jianhong Wang
- Department of Medical Oncology, Nantong University Affiliated Tumor Hospital, Nantong, People’s Republic of China
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Yang H, Li J, Tang R, Liu Y, Shao Y, Huang Q, Shi J. Telomere reverse transcriptase (TERT) rs2735940 increases cancer risk. Med Sci Monit 2015; 21:612-6. [PMID: 25716168 PMCID: PMC4354426 DOI: 10.12659/msm.893087] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Background Telomerase reverse transcriptase (TERT) rs2735940 polymorphism was found to be associated with increased cancer risk. However, recent studies reported controversial results. The aim of our study was to detect its relationship with cancer risk. Material/Methods EMBASE and PubMed databases were searched for all publications until October 2014. ORs and 95% CIs were applied to investigate the association in the random-effects model. Results Thirteen case-control studies with 19385 cases and 17558 controls were included in this study. We found a significant association between cancer risk and TERT rs2735940 polymorphism (OR=1.06, 95% CI 1.02–1.11, P=0.005). In the subgroup analysis by ethnicity, a marginal association was found in Caucasians (OR=1.05, 95% CI 1.00–1.10, P=0.05), but not in Asians (OR=1.01, 95% CI 0.82–1.24, P=0.93). In the subgroup analysis by cancer site, this polymorphism was significantly associated with lung cancer risk (OR=1.08, 95% CI 1.02–1.13, P=0.004). Conclusions TERT rs2735940 polymorphism was significantly associated with cancer risk, especially lung cancer.
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Affiliation(s)
- Hui Yang
- School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shanxi, China (mainland)
| | - Jing Li
- School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shanxi, China (mainland)
| | - Ruihua Tang
- School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shanxi, China (mainland)
| | - Yaxiong Liu
- School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shanxi, China (mainland)
| | - Yan Shao
- School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shanxi, China (mainland)
| | - Qingsheng Huang
- School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shanxi, China (mainland)
| | - Junling Shi
- School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shanxi, China (mainland)
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Park CK, Lee SH, Kim JY, Kim JE, Kim TM, Lee ST, Choi SH, Park SH, Kim IH. Expression level of hTERT is regulated by somatic mutation and common single nucleotide polymorphism at promoter region in glioblastoma. Oncotarget 2015; 5:3399-407. [PMID: 24930669 PMCID: PMC4102818 DOI: 10.18632/oncotarget.1975] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
We investigated the role of somatic mutations and a common single nucleotide polymorphism (SNP) in the hTERT promoter region on hTERT expression and clinical outcomes. The hTERT promoter region was sequenced from 48 glioblastomas. hTERT expression was analyzed by quantitative real time-PCR. The association between hTERT promoter genetic changes and other genomic events and clinical variables common in gliomas were examined. C228T and C250T somatic mutations were found in 60.4% of glioblastomas, and a common SNP (T349C) was found in 66.6%. Somatic mutations and the SNP likely have opposing effects on hTERT expression. hTERT expression was significantly higher in the C228T or C250T mutated tumors. Tumors with the T349C genotype showed lower hTERT expression when C228T or C250T mutations were present. However, no significant survival differences were observed among the groups with or without hTERT promoter mutations and SNP. There was a significant association between genetic changes in the hTERT promoter and patient age as well as MGMT promoter methylation and EGFR amplification. hTERT expression is modulated by somatic mutations in the hTERT promoter as well as a common polymorphism. However, hTERT related genomic changes have limited value as an independent prognostic factor for clinical outcomes in glioblastomas.
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Affiliation(s)
- Chul-Kee Park
- Department of Neurosurgery, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Korea;Department of Biomedical Research Institute, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Korea
| | | | | | | | | | | | | | | | - Il Han Kim
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Korea
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Zhao MM, Zhang Y, Shen L, Ren YW, Li XL, Yin ZH, Zhou BS. Genetic variations in TERT-CLPTM1L genes and risk of lung cancer in a Chinese population. Asian Pac J Cancer Prev 2015; 15:2809-13. [PMID: 24761905 DOI: 10.7314/apjcp.2014.15.6.2809] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND This study was conducted to investigate the association between single nucleotide polymorphisms (SNPs) in telomerase reverse transcriptase (TERT) and cleft lip and palate transmembrane1-like (CLPTM1L) and lung cancer risk in a Chinese population. METHODS We performed a hospital-based case-control study, including 980 lung cancer cases and 1000 cancer-free controls matched for age and sex. Each case and control was interviewed to collect information by well-trained interviewers. A total of 5 ml of venous blood was collected for genotype testing of TERT rs2736098 and CLPTM1L rs401681 using TaqMan methodology. RESULTS The results revealed that the variant homozygote TERT rs2736098TT was associated with an increased risk of lung cancer (OR=2.017, 95%CI=1.518-2.681), especially lung adenocarcinoma (OR=2.117, 95%CI=1.557-3.043) and small cell carcinoma (OR=1.979, 95%CI: 1.174-3.334), compared with the TERT rs2736098CC genotype. Similar results were observed in non-smokers. CONCLUSION The TERT rs2736098 polymorphism might affect the susceptibility to lung cancer in Chinese populations. The associations need to be verified in larger and different populations.
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Affiliation(s)
- Meng-Meng Zhao
- Department of Epidemiology, School of Public Health, China Medical University, Shenyang, China E-mail :
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Hashemi M, Amininia S, Ebrahimi M, Hashemi SM, Taheri M, Ghavami S. Association between hTERT polymorphisms and the risk of breast cancer in a sample of Southeast Iranian population. BMC Res Notes 2014; 7:895. [PMID: 25491902 PMCID: PMC4295305 DOI: 10.1186/1756-0500-7-895] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2014] [Accepted: 11/21/2014] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Breast cancer (BC) is considered to be one of the most important causes of death worldwide, and it affects the Iranian female population a decade earlier than female in other parts of the world. Human telomerase reverse transcriptase (hTERT) is a main subunit of the telomerase complex. MNS16A is located downstream of the hTERT gene and is recognized as the regulator of hTERT promoter activity. The aim of the present study was to access the possible impact of hTERT variants on BC risk in an Iranian population in southeast Iran. METHODS A total of 491 subjects including 266 BC patients and 225 healthy women participated in the study. Polymerase chain reaction (PCR) was used to genotype the MNS16A variable number of tandem repeats and 177 bp ins/del polymorphisms in the hTERT gene. PCR-RFLP and ARMS-PCR were used to genotype hTERT rs2736098 and 2735940, respectively. The association between genotypes and BC was assessed by computing the odds ratio (OR) and 95% confidence intervals (95% CI) from logistic regression analyses. A p-value of <0.05 was considered statistically significant. RESULTS The MNS16A genotype frequency distribution in BC patients was: LL, 43.2%; LS, 51.1%; and SS, 5.7%, and in controls: LL, 29.5%; LS, 68.3%; and SS, 2.2%. The LS genotype decreased the risk of BC compared with LL (OR=0.51, 95% CI=0.35-0.75, p<0.001). The hTERT 177 bp ins/del polymorphism was not polymorphic in our population. All subjects had the ins/ins genotype. Our findings indicate that the MNS16A genotype and hTERT rs2736098 variant were associated with BC risk in the study. We also showed that the rs2736098 A/G polymorphism increased the risk of BC (OR=1.80, 95% CI=1.12-2.88, p=0.017, AG vs AA; OR=1.80, 95% CI=1.06-3.06, p=0.033, GG vs AA; OR=1.87, 95% CI=1.19-2.94, p=0.006, AG+GG vs AA). No significant association was found between the rs2735940 C/T variant and BC. CONCLUSION Our findings indicate that the MNS16A genotype and the hTERT rs2736098 variant influence the risk of BC in an Iranian population in southeast Iran.
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Affiliation(s)
- Mohammad Hashemi
- Cellular and Molecular Research Center, Zahedan University of Medical Sciences, Zahedan, Iran.
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Singh V, Jaiswal PK, Mittal RD. Replicative study of GWAS TP63C/T, TERTC/T, and SLC14A1C/T with susceptibility to bladder cancer in North Indians. Urol Oncol 2014; 32:1209-14. [PMID: 25218484 DOI: 10.1016/j.urolonc.2014.05.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Revised: 05/30/2014] [Accepted: 05/31/2014] [Indexed: 11/27/2022]
Abstract
OBJECTIVE Genome-wide association studies have confirmed association of TP63C/T rs710521, TERTC/T rs2736098, and SLC14A1C/T rs17674580 gene variants with susceptibility to bladder cancer (BC) in European and White population. However, the risk conferred for BC for above gene variants in North Indians is unknown. We therefore, studied the association of TP63C/T, TERTC/T, and SLC14A1C/T single nucleotide polymorphisms (SNPs) with a risk of BC susceptibility in North Indian cohort. MATERIAL AND METHODS In histologically confirmed 225 BC cases and 240 healthy controls, 3 SNPs were genotyped by real-time polymerase chain reaction. To evaluate the SNP effects on BC susceptibility, odds ratio (OR) and CI 95% were calculated. RESULTS In case of TP63C/T, the variant genotype (TT) showed significant reduced risk for BC (P = 0.045, OR = 0.53). Combining heterozygous and variant genotypes also demonstrated reduced risk for BC (P< 0.001, OR = 0.54). In case of TERTC/T, heterozygous genotype (CT) as well as variant genotype (TT) showed significant risk for BC susceptibility (P = 0.031, OR = 1.77 and P = 0.004, OR = 2.78, respectively) along with T allelic level (P<0.001, OR = 4.19). Furthermore, in case of SLC14A1C/T gene polymorphism, the variant genotype (TT) showed significant high risk for BC susceptibility (P = 0.006; OR = 3.01) along with variant T allelic level (P = 0.003, OR = 1.52). Interestingly, smoking was also found to modulate risks for BC in case of TERT and SLC14A1 variant genotype (TT). Further clinical confounding factor, namely, tumor grade/stage level of cases, supports the genotypic data with TERT and SLC14A1 showing a risk for BC susceptibility. CONCLUSION Our results suggested that polymorphism in TERTC/T and SLC14A1C/T confirmed high risk for BC in North Indian population. However, TP63C/T showed reduced risk of BC susceptibility. More replicate studies with large sample size and diverse ethnicity are required to validate these observations.
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Affiliation(s)
- Vibha Singh
- Department of Urology and Renal Transplantation, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Uttar Pradesh, India
| | - Praveen Kumar Jaiswal
- Department of Urology and Renal Transplantation, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Uttar Pradesh, India
| | - Rama Devi Mittal
- Department of Urology and Renal Transplantation, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Uttar Pradesh, India.
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Wang HM, Zhang XY, Jin B. TERT genetic polymorphism rs2736100 was associated with lung cancer: a meta-analysis based on 14,492 subjects. Genet Test Mol Biomarkers 2014; 17:937-41. [PMID: 24283584 DOI: 10.1089/gtmb.2013.0322] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Previous studies focused on the association of the telomerase reverse transcriptase (TERT) gene polymorphism rs2736100 with lung cancer did not reach the same conclusion. In the present study, we performed a meta-analysis to systematically summarize the possible association between TERT polymorphism rs2736100 and the risk for lung cancer. METHOD We conducted a search of case-control studies on the association of TERT with susceptibility to lung cancer in PubMed, EMBASE, ISI Web of Science, Wanfang database in China, and Chinese National Knowledge Infrastructure (CNKI) databases. Data from eligible studies were extracted for meta-analysis. Lung cancer risk associated with rs2736100 was estimated by pooled odds ratios (ORs) and 95% confidence intervals (95% CIs). RESULTS Six independent case-control studies on rs2736100 were included in our meta-analysis. Our results showed that rs2736100 was associated with the risk of lung cancer not only in an additive model (OR=1.19, 95% CI: 1.04-1.35; p=0.01), but also in a dominant model (OR=1.14, 95% CI: 1.01-1.28; p=0.03). CONCLUSIONS This meta-analysis suggests that rs2736100 is associated with the risk of lung cancer.
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Affiliation(s)
- Hui-Min Wang
- Department of Respiratory Medicine, Shanghai Chest Hospital, Shanghai Jiao Tong University , Shanghai, People's Republic of China
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Genetic polymorphisms of TERT and CLPTM1L and risk of lung cancer: a case-control study in northeast Chinese male population. Med Oncol 2014; 31:18. [PMID: 24861918 DOI: 10.1007/s12032-014-0018-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Accepted: 04/29/2014] [Indexed: 10/25/2022]
Abstract
Recently, some genome-wide association studies have implicated telomerase reverse transcriptase (TERT) and cleft lip and palate transmembrane 1-like gene (CLPTM1L) in lung cancer development. Here, we present a case-control study that evaluates the genetic effects of TERT-rs2736098 and CLPTM1L-rs401681 variants on the risk of lung cancer development in a Chinese male population. We found that the homozygous variant genetic model of the TERT gene was associated with a significantly increased risk of lung cancer with an adjusted odds ratio (OR) of 1.988. The TERT-rs2736098 T allele was also associated with increased lung cancer risk both in adenocarcinoma and squamous cell carcinoma. No association was found between CLPTM1L-rs401681 and lung cancer risk. However, the joint effect of TERT and CLPTM1L variants increased the risk of lung cancer, especially squamous cell carcinoma, with an adjusted OR of 3.274. However, the exact functional effect of these two variant genes remains unclear, and further investigation is needed in the future.
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Jung SW, Park NH, Shin JW, Park BR, Kim CJ, Lee JE, Shin ES, Kim JA, Chung YH. Prognostic impact of telomere maintenance gene polymorphisms on hepatocellular carcinoma patients with chronic hepatitis B. Hepatology 2014; 59:1912-20. [PMID: 23907815 DOI: 10.1002/hep.26655] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2013] [Accepted: 07/19/2013] [Indexed: 01/01/2023]
Abstract
UNLABELLED Our goal was to determine whether single-nucleotide polymorphisms (SNPs) of telomere maintenance genes influence the development and clinical outcomes of patients with hepatitis B virus (HBV)-associated hepatocellular carcinoma (HCC). We evaluated 20 SNPs of five telomere maintenance genes in 702 patients with HCC and 351 hepatitis B virus surface antigen-positive controls without HCC. Significant SNPs were then validated in an independent cohort of 857 HCC patients and 429 controls. We assessed the association of each SNP with the development of HCC and overall survival through a multivariate Cox proportional analysis. A significantly increased risk of HCC development was identified for the telomerase-associated protein 1 (TEP1) rs1713449 SNP in both the discovery and replication phases (combined odds ratio = 1.42, P = 9.378 × 10(-5) ). In addition, the TEP1 rs1713449, TEP1 rs872072, protection of telomeres 1 homolog rs7784168, telomerase reverse transcriptase rs13167280, and telomeric repeat binding factor 1 rs2306494 SNPs had a significant effect on the overall survival, and a similar survival effect was validated in the replication cohort. Moreover, there was a significant dose-dependent association between the number of putatively high-risk genotypes of the five aforementioned SNPs and overall survival. The median survival time was significantly prolonged for patients with HCC with two or fewer putatively high-risk genotypes versus those with three or more high-risk genotypes (85 versus 44 months, log-rank P = 4.483 × 10(-5) ), and this was demonstrated in the replication cohort (52 versus 37 months, log-rank P = 0.026). CONCLUSION These observations suggest that the SNPs of telomere maintenance genes play a potential role in the development of HCC and the survival of HCC patients with chronic HBV infections.
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Affiliation(s)
- Seok Won Jung
- Department of Internal Medicine, University of Ulsan College of Medicine, Ulsan University Hospital, Ulsan, Korea
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Abstract
Telomeres are ribonucleoprotein structures capping the end of every linear chromosome. In all vertebrates, they are composed of TTAGGG repeats coated with specific protecting proteins. Telomeres shorten with each mitotic cell division, but telomerase, a reverse transcriptase, elongate telomeres in very specific cells, such as embryonic and adult stem cells. Although telomere sequence is identical in mice and humans and telomeres serve the same role of protecting chromosomes and genetic information from damage and erosion in both species, abnormalities in telomere maintenance and in telomerase function do not coincide in phenotype in humans and mice. The telomeres of most laboratory mice are 5 to 10 times longer than in humans, but their lifespan is 30 times shorter. Complete absence of telomerase has little expression in phenotype over several generations in mice, whereas heterozygosity for telomerase mutations in humans is sufficient to result in organ regeneration defect and cancer development. Patients with telomerase deficiency and very short telomeres may develop aplastic anemia, pulmonary fibrosis, or cirrhosis, whereas telomerase-null murine models display only modest hematopoietic deficiency and develop emphysema when exposed to cigarette smoke. In summary, telomerase deficiency in both humans and mice accelerate telomere shortening, but its consequences in the different organs and in the organism diverge, mainly due to telomere length differences.
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Yan L, Wu S, Zhang S, Ji G, Gu A. Genetic variants in telomerase reverse transcriptase (TERT) and telomerase-associated protein 1 (TEP1) and the risk of male infertility. Gene 2014; 534:139-43. [DOI: 10.1016/j.gene.2013.11.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Revised: 10/09/2013] [Accepted: 11/01/2013] [Indexed: 11/27/2022]
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Association between the telomerase reverse transcriptase (TERT) rs2736098 polymorphism and cancer risk: evidence from a case-control study of non-small-cell lung cancer and a meta-analysis. PLoS One 2013; 8:e76372. [PMID: 24260099 PMCID: PMC3834105 DOI: 10.1371/journal.pone.0076372] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Accepted: 08/26/2013] [Indexed: 12/28/2022] Open
Abstract
Background A common genetic variant, telomerase reverse transcriptase (TERT) rs2736098, was recently reported to be associated with lung cancer risk in Caucasians. In addition, many studies have investigated the role of this polymorphism in the etiology of cancer of various organs. Nevertheless, the results of related case-control studies remain inconsistent. Methods We hypothesized that the genetic risk variant identified in Caucasians may potentially influence the susceptibility to lung cancer in the Chinese population. To test this hypothesis, a case-control study including 539 non-small-cell lung cancer (NSCLC) cases and 627 cancer-free controls was conducted. Furthermore, to investigate the association between rs2736098 and cancer risk, a meta-analysis based on previously published studies and our case-control study was also performed. Results Multivariate logistic regression demonstrated that individuals carrying the A allele or the AA genotype exhibited a significantly elevated risk of NSCLC compared with those carrying the G allele or GG genotype (A vs. G: OR = 1.21, 95% CI = 1.02–1.43, P = 0.028; AA vs. GG: OR = 1.48, 95% CI = 1.05–2.09, P = 0.025). Additionally, this association was stronger among adenocarcinoma cases (AA vs. GG: OR = 1.67, 95% CI = 1.12–2.50, P = 0.013; A vs. G: OR = 1.28, 95% CI = 1.05–1.57, P = 0.016). In the meta-analysis, a borderline significant association between the rs2736098 polymorphism and overall cancer risk was observed (AA vs. GG: OR = 1.25, 95% CI = 1.07–1.46; AA vs. AG+GG: OR = 1.22, 95% CI = 1.06–1.41; additive model: OR = 1.10, 95% CI = 1.02–1.18), and further stratifications demonstrated a moderately increased risk for lung and bladder cancer, Asian ethnicity and hospital-based studies. Conclusions Our results suggest that the rs2736098 polymorphism may contribute to the risk of lung cancer, especially adenocarcinoma, in the Chinese population. In addition, the current meta-analysis indicates that this genetic variant is only weakly associated with overall cancer risk. However, the rs2736098 polymorphism may affect individual susceptibility to lung and bladder cancer. Further studies are needed to validate our findings.
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Ledwoń JK, Hennig EE, Maryan N, Goryca K, Nowakowska D, Niwińska A, Ostrowski J. Common low-penetrance risk variants associated with breast cancer in Polish women. BMC Cancer 2013; 13:510. [PMID: 24171766 PMCID: PMC4228440 DOI: 10.1186/1471-2407-13-510] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2013] [Accepted: 10/23/2013] [Indexed: 01/19/2023] Open
Abstract
Background Breast cancer is the most common type of cancer and the second leading cause of cancer-death among women in Poland. The known high-risk mutations account for 25% of familial aggregation cases and 5% of total breast cancer predisposition. Genome-wide association studies have identified a number of common low-penetrance genetic variants, but their contribution to disease risk differs between populations. Methods To verify selected associations with breast cancer susceptibility among Polish women, the replication study was performed, included 1424 women with breast cancer and 1788 healthy persons. Sixteen single-nucleotide polymorphisms (SNPs) were analyzed using TaqMan SNP Genotyping Assays. Allele frequency differences were tested using chi2-test implemented in PLINK v1.07 and Cochran-Armitage trend test was performed using R software. Results Significant differences (Bonferroni corrected p-valuecor ≤ 0.0197) in the frequency of alleles distribution between all cancer and control subjects were observed for four (rs2736098, rs13281615, rs1219648, rs2981582) out of 16 SNPs. The same result was obtained for group of patients without high-risk BRCA1/2 mutations. The rs1219648 (p-valuecor ≤ 6.73E-03) and rs2981582 (p-valuecor ≤ 6.48E-03) SNPs showed significant association with both familial and sporadic cancers. Additionally, rs2736098 (p-valuecor ≤ 0.0234) was associated with only sporadic cancers; also in group without carriers of high-risk mutation. All these associations revealed their significance also in Cochran-Armitage trend test. Opposite to other SNPs, rs2736098 was associated with a decreased risk of breast cancer. Conclusion The association of four known susceptibility SNPs, representing three individual loci, with breast cancer risk in Polish women was confirmed. One of them (rs2736098) seems to be specific for the Polish population. Due to the population differences in allele frequencies, identification of general genetic risk factors requires sets of association studies conducted on different populations.
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Affiliation(s)
| | - Ewa E Hennig
- Department of Gastroenterology and Hepatology, Medical Center for Postgraduate Education, Warsaw, Poland.
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TERT promoter mutations in bladder cancer affect patient survival and disease recurrence through modification by a common polymorphism. Proc Natl Acad Sci U S A 2013; 110:17426-31. [PMID: 24101484 DOI: 10.1073/pnas.1310522110] [Citation(s) in RCA: 257] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The telomerase reverse transcriptase (TERT) promoter, an important element of telomerase expression, has emerged as a target of cancer-specific mutations. Originally described in melanoma, the mutations in TERT promoter have been shown to be common in certain other tumor types that include glioblastoma, hepatocellular carcinoma, and bladder cancer. To fully define the occurrence and effect of the TERT promoter mutations, we investigated tumors from a well-characterized series of 327 patients with urothelial cell carcinoma of bladder. The somatic mutations, mainly at positions -124 and -146 bp from ATG start site that create binding motifs for E-twenty six/ternary complex factors (Ets/TCF), affected 65.4% of the tumors, with even distribution across different stages and grades. Our data showed that a common polymorphism rs2853669, within a preexisting Ets2 binding site in the TERT promoter, acts as a modifier of the effect of the mutations on survival and tumor recurrence. The patients with the mutations showed poor survival in the absence [hazard ratio (HR) 2.19, 95% confidence interval (CI) 1.02-4.70] but not in the presence (HR 0.42, 95% CI 0.18-1.01) of the variant allele of the polymorphism. The mutations in the absence of the variant allele were highly associated with the disease recurrence in patients with Tis, Ta, and T1 tumors (HR 1.85, 95% CI 1.11-3.08). The TERT promoter mutations are the most common somatic lesions in bladder cancer with clinical implications. The association of the mutations with patient survival and disease recurrence, subject to modification by a common polymorphism, can be a unique putative marker with individualized prognostic potential.
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Li C, Yin Z, Wu W, Li X, Zhou B. Genetic variants in TERT–CLPTM1L genetic region associated with several types of cancer: A meta-analysis. Gene 2013; 526:390-9. [DOI: 10.1016/j.gene.2013.05.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2012] [Revised: 04/26/2013] [Accepted: 05/01/2013] [Indexed: 01/08/2023]
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Zhong R, Liu L, Zou L, Zhu Y, Chen W, Zhu B, Shen N, Rui R, Long L, Ke J, Lu X, Zhang T, Zhang Y, Wang Z, Liu L, Sun Y, Cheng L, Miao X. Genetic variations in TERT-CLPTM1L locus are associated with risk of lung cancer in Chinese population. Mol Carcinog 2013; 52 Suppl 1:E118-26. [PMID: 23908149 DOI: 10.1002/mc.22043] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2012] [Revised: 04/02/2013] [Accepted: 04/14/2013] [Indexed: 12/29/2022]
Abstract
Recent genome-wide association studies (GWAS) have reported multiple genetic variations at 5p15.33 (TERT-CLPTM1L) associated with risk of lung cancer. However, most of the associated variations identified by GWAS thus far are unlikely to be the actual causal variants, but may be mostly marker-single nucleotide polymorphisms tagging functional variations that influence gene expression. This study aimed to explore the function-validated and potentially functional variations in TERT-CLPTM1L locus conferring susceptibility to lung cancer. A case-control study including 502 cases and 502 controls in Chinese Han population was firstly conducted. Bioinformatic approaches are applied to prioritize genetic variations based on their potential functionality. In the logistic regression analysis, TERT-rs2853669, rs2736108, and CLPTM1L-rs31490 were significant associated with increased risk of lung cancer (OR = 1.46, 95% CI = 1.22-1.75; OR = 1.22, 95% CI = 1.00-1.49 and OR = 1.74, 95% CI = 1.35-2.23 under additive model, respectively). The significant associations were observed in non-small-cell lung cancer but not-in-small-cell lung cancer, and more prominent in adenocarcinoma. Haplotype analysis presented a significant allele-dose effect of haplotypes in increasing risk of lung cancer (P for trend = 1.894 × 10(-6)). Moreover, significant multiplicative interactions were observed between smoking and these three polymorphisms of TERT-rs2853669, rs2736108, and CLPTM1L-rs31490, even after bonferroni correction for multiple comparisons (Pinteraction = 1.316 × 10(-9), 3.912 × 10(-4), and 2.483 × 10(-5), respectively). These findings indicated that the function-validated and potentially functional variations in TERT-CLPTM1L locus, modified by smoking, may play a substantial role in the susceptibility to lung cancer.
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Affiliation(s)
- Rong Zhong
- Department of Epidemiology and Biostatistics and the Ministry of Education Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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Iizuka T, Sawabe M, Takubo K, Liu M, Homma Y, Suzuki M, Arai T. hTERT promoter polymorphism, -1327C>T, is associated with the risk of epithelial cancer. SPRINGERPLUS 2013; 2:249. [PMID: 23762817 PMCID: PMC3676739 DOI: 10.1186/2193-1801-2-249] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Accepted: 05/24/2013] [Indexed: 12/24/2022]
Abstract
Telomeres are repetitive nucleotide sequences that cap the end of eukaryotic chromosomes. Attrition of these structures has been associated with carcinogenesis in many tissues, and therefore, they are essential for chromosome stabilization. Telomeres are maintained by telomerase complexes, of which human telomerase reverse transcriptase (hTERT) is an essential component. A functional polymorphism, -1327C>T (rs2735940), located in the promoter of the hTERT gene is associated with telomere length in peripheral blood leukocytes. We hypothesized that this polymorphism might affect susceptibility to various epithelial malignancies. The -1327C>T polymorphism was examined in 1,551 consecutive autopsy cases (mean age, 80.3 years), and we focused on its effect on the risks of overall and each primary malignancies. The polymorphism was further studied in 391 clinical prostate cancer patients who were diagnosed via prostate biopsy, using autopsy cases as controls. In the autopsy cases, the risk of epithelial malignancy, after adjusting for age, sex, smoking, and drinking habits, was significantly lower for the TT genotype than the CC (reference) genotype (adjusted odds ratio = 0.61, 95% CI = 0.42-0.90). Among primary malignancies, latent prostate cancer, colorectal cancer, and lung cancer were the most strongly associated with the polymorphism. In the study using clinical prostate cancer patients, susceptibility to clinical prostate cancer was lower for -1327 T carriers than for -1327 T non-carriers, but this finding was not significant. The data suggest that the hTERT promoter polymorphism, -1327C>T, is an independent factor influencing the risk of various epithelial malignancies in elderly Japanese.
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Affiliation(s)
- Toshihiko Iizuka
- Research Team for Geriatric Pathology, Tokyo Metropolitan Institute of Gerontology, 35-2 Sakae-cho, Itabashi-ku, Tokyo, 173-0015 Japan ; Department of Diagnostic Pathology, National Center for Global Health and Medicine, 1-21-1, Toyama, Shinjuku-ku, Tokyo, 162-8655 Japan
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Pellatt AJ, Wolff RK, Torres-Mejia G, John EM, Herrick JS, Lundgreen A, Baumgartner KB, Giuliano AR, Hines LM, Fejerman L, Cawthon R, Slattery ML. Telomere length, telomere-related genes, and breast cancer risk: the breast cancer health disparities study. Genes Chromosomes Cancer 2013; 52:595-609. [PMID: 23629941 DOI: 10.1002/gcc.22056] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Accepted: 02/04/2013] [Indexed: 12/25/2022] Open
Abstract
Telomeres are involved in maintaining genomic stability. Previous studies have linked both telomere length (TL) and telomere-related genes with cancer. We evaluated associations between telomere-related genes, TL, and breast cancer risk in an admixed population of US non-Hispanic white (1,481 cases, 1,586 controls) and U.S. Hispanic and Mexican women (2,111 cases, 2,597 controls) from the Breast Cancer Health Disparities Study. TL was assessed in 1,500 women based on their genetic ancestry. TL-related genes assessed were MEN1, MRE11A, RECQL5, TEP1, TERC, TERF2, TERT, TNKS, and TNKS2. Longer TL was associated with increased breast cancer risk [odds ratio (OR) 1.87, 95% confidence interval (CI) 1.38, 2.55], with the highest risk (OR 3.11, 95% CI 1.74, 5.67 p interaction 0.02) among women with high Indigenous American ancestry. Several TL-related single nucleotide polymorphisms had modest association with breast cancer risk overall, including TEP1 rs93886 (OR 0.82, 95% CI 0.70,0.95); TERF2 rs3785074 (OR 1.13, 95% CI 1.03,1.24); TERT rs4246742 (OR 0.85, 95% CI 0.77,0.93); TERT rs10069690 (OR 1.13, 95% CI 1.03,1.24); TERT rs2242652 (OR 1.51, 95% CI 1.11,2.04); and TNKS rs6990300 (OR 0.89, 95% CI 0.81,0.97). Several differences in association were detected by hormone receptor status of tumors. Most notable were associations with TERT rs2736118 (ORadj 6.18, 95% CI 2.90, 13.19) with estrogen receptor negative/progesterone receptor positive (ER-/PR+) tumors and TERT rs2735940 (ORadj 0.73, 95% CI 0.59, 0.91) with ER-/PR- tumors. These data provide support for an association between TL and TL-related genes and risk of breast cancer. The association may be modified by hormone receptor status and genetic ancestry.
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Affiliation(s)
- Andrew J Pellatt
- Department of Medicine, University of Utah, Salt Lake City, UT 84108, USA
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Zhang C, Tian YP, Wang Y, Guo FH, Qin JF, Ni H. hTERT rs2736098 genetic variants and susceptibility of hepatocellular carcinoma in the Chinese population: a case-control study. Hepatobiliary Pancreat Dis Int 2013; 12:74-9. [PMID: 23392802 DOI: 10.1016/s1499-3872(13)60009-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
BACKGROUND The human telomerase reverse transcriptase (hTERT) gene encodes the catalytic subunit of telomerase, which mediates pleiotropic effects, including the regulation of senescence and proliferation and plays an important role in carcinogenesis. This study attempts to clarify the genetic predisposition to hepatocellular carcinoma (HCC), focusing on the hTERT gene rs2736098 polymorphism. METHOD Four hundred patients with HCC and 400 non-cancer controls were genotyped to elucidate the potential association between hTERT rs2736098 polymorphism and HCC risks. RESULTS Compared with the controls, the patients with HCC had a lower frequency of G/G genotype (33.3% vs 44.3%, P=0.001) and a higher frequency of G/A (51.5% vs 39.5%, P=0.001). Allele genotypic frequencies in the patients differed from those of the controls (P=0.040). The data of this study rs2736098[A] allele contributed significantly to HCC risk in female patients (OR=1.78, 95% CI, 1.17-2.72, P=0.007), patients with HCV infection (OR=2.89, 95% CI, 1.08-7.70, P=0.031), non-drinker patients (OR=1.32, 95% CI, 1.06-1.65, P=0.015), and patients not affected by HBV (OR=1.77, 95% CI, 1.30-2.40, P<0.001). CONCLUSIONS rs2736098[A] may be an independent hereditary parameter in HCC, but some risk factors would cover up the association by more powerful hepatocarcinogenesis. These results are important guidance for further studies in detecting HCC-associated single nucleotide polymorphisms.
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Affiliation(s)
- Chao Zhang
- Tianjin Medical University General Hospital, Tianjin 300071, China
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Zhang XJ, Xu Z, Gong YL, Tang CJ, Chen JF. Association of TERT rs2736098 Polymorphism with Cancer Risk: a Meta-analysis. Asian Pac J Cancer Prev 2012; 13:4943-6. [DOI: 10.7314/apjcp.2012.13.10.4943] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Shen J, Terry MB, Liao Y, Gurvich I, Wang Q, Senie RT, Santella RM. Genetic variation in telomere maintenance genes, telomere length and breast cancer risk. PLoS One 2012; 7:e44308. [PMID: 22970196 PMCID: PMC3435409 DOI: 10.1371/journal.pone.0044308] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2012] [Accepted: 08/01/2012] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Telomeres at the ends of eukaryotic chromosomes play a critical role in maintaining the integrity and stability of the genome and participate in the initiation of DNA damage/repair responses. METHODS We performed a case-control study to evaluate the role of three SNPs (TERT-07, TERT-54 and POT1-03) in telomere maintenance genes previously found to be significantly associated with breast cancer risk. We used sister-sets obtained from the New York site of the Breast Cancer Family Registry (BCFR). Among the 313 sister-sets, there were 333 breast cancer cases and 409 unaffected sisters who were evaluated in the current study. We separately applied conditional logistic regression and generalized estimating equations (GEE) models to evaluate associations between the three SNPs and breast cancer risk within sister-sets. We examined the associations between genotype, covariates and telomere length among unaffected sisters using a GEE model. RESULTS We found no significant associations between the three SNPs in telomere maintenance genes and breast cancer risk by both conditional logistic regression and GEE models, nor were these SNPs significantly related to telomere length. Among unaffected sisters, shortened telomeres were statistically significantly correlated with never hormone replacement therapy (HRT) use. Increased duration of HRT use was significantly associated with reduced telomere length. The means of telomere length were 0.77 (SD = 0.35) for never HRT use, 0.67 (SD = 0.29) for HRT use < 5 yrs and 0.59 (SD = 0.24) for HRT use ≥ 5 yrs after adjusting for age of blood donation and race and ethnicity. CONCLUSIONS We found that exogenous hormonal exposure was inversely associated with telomere length. No significant associations between genetic variants and telomere length or breast cancer risk were observed. These findings provide initial evidence to understand hormonal exposure in the regulation of telomere length and breast cancer risk but need replication in prospective studies.
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Affiliation(s)
- Jing Shen
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, New York, United States of America.
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Qi HY, Zou P, Zhao L, Zhu J, Gu AH. TERT rs2736098 Polymorphism and Cancer Risk: Results of a Meta-analysis. Asian Pac J Cancer Prev 2012; 13:3483-8. [DOI: 10.7314/apjcp.2012.13.7.3483] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Mocellin S, Verdi D, Pooley KA, Landi MT, Egan KM, Baird DM, Prescott J, De Vivo I, Nitti D. Telomerase reverse transcriptase locus polymorphisms and cancer risk: a field synopsis and meta-analysis. J Natl Cancer Inst 2012; 104:840-54. [PMID: 22523397 DOI: 10.1093/jnci/djs222] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Several recent studies have provided evidence that polymorphisms in the telomerase reverse transcriptase (TERT) gene sequence are associated with cancer development, but a comprehensive synopsis is not available. We conducted a systematic review and meta-analysis of the available molecular epidemiology data regarding the association between TERT locus polymorphisms and predisposition to cancer. METHODS A systematic review of the English literature was conducted by searching PubMed, Embase, Cancerlit, Google Scholar, and ISI Web of Knowledge databases for studies on associations between TERT locus polymorphisms and cancer risk. Random-effects meta-analysis was performed to pool per-allele odds ratios for TERT locus polymorphisms and risk of cancer, and between-study heterogeneity and potential bias sources (eg, publication and chasing bias) were assessed. Because the TERT locus includes the cleft lip and palate transmembrane 1-like (CLPTM1L) gene, which is in linkage disequilibrium with TERT, CLPTM1L polymorphisms were also analyzed. Cumulative evidence for polymorphisms with statistically significant associations was graded as "strong," "moderate," and "weak" according to the Venice criteria. The joint population attributable risk was calculated for polymorphisms with strong evidence of association. RESULTS Eighty-five studies enrolling 490 901 subjects and reporting on 494 allelic contrasts were retrieved. Data were available on 67 TERT locus polymorphisms and 24 tumor types, for a total of 221 unique combinations of polymorphisms and cancer types. Upon meta-analysis, a statistically significant association with the risk of any cancer type was found for 22 polymorphisms. Strong, moderate, and weak cumulative evidence for association with at least one tumor type was demonstrated for 11, 9, and 14 polymorphisms, respectively. For lung cancer, which was the most studied tumor type, the estimated joint population attributable risk for three polymorphisms (TERT rs2736100, intergenic rs4635969, and CLPTM1L rs402710) was 41%. Strong evidence for lack of association was identified for five polymorphisms in three tumor types. CONCLUSIONS To our knowledge, this is the largest collection of data for associations between TERT locus polymorphisms and cancer risk. Our findings support the hypothesis that genetic variability in this genomic region can modulate cancer susceptibility in humans.
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Affiliation(s)
- Simone Mocellin
- Department of Oncological and Surgical Sciences, Meta-analysis Unit, University of Padova, Padova, Italy.
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Hou L, Zhang X, Gawron AJ, Liu J. Surrogate tissue telomere length and cancer risk: shorter or longer? Cancer Lett 2012; 319:130-135. [PMID: 22269209 DOI: 10.1016/j.canlet.2012.01.028] [Citation(s) in RCA: 90] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2011] [Revised: 01/13/2012] [Accepted: 01/16/2012] [Indexed: 12/24/2022]
Abstract
Telomeres play a critical role in chromosome stability. Telomere length (TL) shortening is a risk factor for cancers. Measuring TL in surrogate tissues that can be easily collected may provide a potential tool for early detection of cancers. A number of studies on surrogate tissue TL and cancer risks have been conducted and results are inconsistent, including positive, negative, or null associations. In this article, we reviewed the published data on surrogate tissue TL in relation to cancer risks, discussed the possible reasons for the differences in the results and future directions and challenges for this line of research.
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Affiliation(s)
- Lifang Hou
- Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, 680 N. Lake Shore Drive, Chicago, IL 60611, United States; The Robert H. Lurie Comprehensive Cancer Center, Feinberg School of Medicine, Northwestern University, 303 E. Superior Street, Chicago, IL 60611, United States.
| | - Xiao Zhang
- Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, 680 N. Lake Shore Drive, Chicago, IL 60611, United States
| | - Andrew J Gawron
- Division of Gastroenterology and Hepatology, Department of Medicine, Feinberg School of Medicine, Northwestern University, 676 N. St. Clair, Chicago, IL 60611, United States
| | - Jie Liu
- Department of Digestive Diseases of Huashan Hospital, Fudan University, 12 Middle Wulumuqi Road, Shanghai 200040, PR China.
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Wang S, Wu J, Hu L, Ding C, Kan Y, Shen Y, Chen X, Shen H, Guo X, Hu Z. Common genetic variants inTERTcontribute to risk of cervical cancer in a Chinese population. Mol Carcinog 2012; 51 Suppl 1:E118-22. [DOI: 10.1002/mc.21872] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2011] [Revised: 12/01/2011] [Accepted: 12/14/2011] [Indexed: 11/08/2022]
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Zheng Y, Ogundiran TO, Adebamowo C, Nathanson KL, Domchek SM, Rebbeck TR, Simon MS, John EM, Hennis A, Nemesure B, Wu SY, Leske MC, Ambs S, Niu Q, Zhang J, Cox NJ, Olopade OI, Huo D. Lack of association between common single nucleotide polymorphisms in the TERT-CLPTM1L locus and breast cancer in women of African ancestry. Breast Cancer Res Treat 2011; 132:341-5. [PMID: 22134622 DOI: 10.1007/s10549-011-1890-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2011] [Accepted: 11/18/2011] [Indexed: 11/26/2022]
Abstract
As one of the most common cancers worldwide, breast cancer places an extraordinary burden on the populations of African ancestry. Common SNPs in the TERT-CLPTM1L locus have been reported to be associated with several types of cancer, including breast cancer. We sought to investigate whether the previously reported common single nucleotide polymorphisms (SNPs) in the TERT-CLPTM1L locus could also contribute to the breast cancer risk in women of African ancestry. We genotyped eleven SNPs in 2,892 women of African descent but were unable to detect any significant association between TERT-CLPTM1L SNPs and their predispositions for breast cancer risk. Given the differences in linkage disequilibrium patterns across populations, our findings suggest that larger independent studies from diverse populations are expected to evaluate the importance of the TERT-CLPTM1L locus in breast cancer.
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Affiliation(s)
- Yonglan Zheng
- Department of Medicine, The University of Chicago, 900 E 57th Street, KCBD Building 8113D, Chicago, IL 60637, USA.
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Abstract
Aging is a biological process that affects most cells, organisms and species. Human aging is associated with increased susceptibility to a variety of chronic diseases, including cardiovascular disease, Type 2 diabetes, neurological diseases and cancer. Despite the remarkable progress made during the last two decades, our understanding of the biology of aging remains incomplete. Telomere biology has recently emerged as an important player in the aging and disease process.
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Koziel JE, Fox MJ, Steding CE, Sprouse AA, Herbert BS. Medical genetics and epigenetics of telomerase. J Cell Mol Med 2011; 15:457-67. [PMID: 21323862 PMCID: PMC3922369 DOI: 10.1111/j.1582-4934.2011.01276.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2011] [Accepted: 02/01/2011] [Indexed: 12/13/2022] Open
Abstract
Telomerase is a specialized reverse transcriptase that extends and maintains the terminal ends of chromosomes, or telomeres. Since its discovery in 1985 by Nobel Laureates Elizabeth Blackburn and Carol Greider, thousands of articles have emerged detailing its significance in telomere function and cell survival. This review provides a current assessment on the importance of telomerase regulation and relates it in terms of medical genetics. In this review, we discuss the recent findings on telomerase regulation, focusing on epigenetics and non-coding RNAs regulation of telomerase, such as microRNAs and the recently discovered telomeric-repeat containing RNA transcripts. Human genetic disorders that develop due to mutations in telomerase subunits, the role of single nucleotide polymorphisms in genes encoding telomerase components and diseases as a result of telomerase regulation going awry are also discussed. Continual investigation of the complex regulation of telomerase will further our insight into the use of controlling telomerase activity in medicine.
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Affiliation(s)
- Jillian E Koziel
- Department of Medical and Molecular Genetics, Indiana University School of MedicineIndianapolis, IN, USA
| | - Melanie J Fox
- Department of Medical and Molecular Genetics, Indiana University School of MedicineIndianapolis, IN, USA
| | - Catherine E Steding
- Department of Medical and Molecular Genetics, Indiana University School of MedicineIndianapolis, IN, USA
| | - Alyssa A Sprouse
- Department of Pharmacology and Toxicology, Indiana University School of MedicineIndianapolis, IN, USA
| | - Brittney-Shea Herbert
- Department of Medical and Molecular Genetics, Indiana University School of MedicineIndianapolis, IN, USA
- Department of Pharmacology and Toxicology, Indiana University School of MedicineIndianapolis, IN, USA
- Indiana University Melvin and Bren Simon Cancer Center, Indiana University School of MedicineIndianapolis, IN, USA
- Indiana University Center for Regenerative Biology and Medicine, Indiana University School of MedicineIndianapolis, IN, USA
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Lobetti-Bodoni C, Bernocco E, Genuardi E, Boccadoro M, Ladetto M. Telomeres and telomerase in normal and malignant B-cells. Hematol Oncol 2011; 28:157-67. [PMID: 20213664 DOI: 10.1002/hon.937] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The telomeric checkpoint is emerging as a critical sensor of cellular damage, playing a major role in human aging and cancer development. In the meantime, telomere biology is rapidly evolving from a basic discipline to a translational branch, capable of providing major hints for biomarker development, risk assessment and targeted treatment of cancer. These advances have a number of implications in the biology of lymphoid tumours. Moreover, there is considerable interest in the potential role of telomeric dysfunction in the wide array of immunological abnormalities, grouped under the definition of 'immunosenescence'. This review will summarize the impact of recent advances in telomere biology on the physiology and pathology of the B lymphocyte, with special interest in immunosenescence and lymphomagenesis.
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Affiliation(s)
- Chiara Lobetti-Bodoni
- Department of Experimental Oncology, Division of Hematology, University of Torino, Italy
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