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Rumšaitė G, Gedvilaitė G, Balnytė R, Kriaučiūnienė L, Liutkevičienė R. The Influence of TEP1 and TERC Genetic Variants on the Susceptibility to Multiple Sclerosis. J Clin Med 2023; 12:5863. [PMID: 37762804 PMCID: PMC10531829 DOI: 10.3390/jcm12185863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 09/04/2023] [Accepted: 09/07/2023] [Indexed: 09/29/2023] Open
Abstract
Multiple sclerosis (MS) is a chronic inflammatory autoimmune disease of the central nervous system. According to recent studies, cellular senescence caused by telomere shortening may contribute to the development of MS. AIM OF THE STUDY Our aim was to determine the associations of TEP1 rs1760904, rs1713418, TERC rs12696304, rs35073794 gene polymorphisms with the occurrence of MS. METHODS The study included 200 patients with MS and 230 healthy controls. Genotyping of TEP1 rs1760904, rs1713418 and TERC rs12696304, rs35073794 was performed using RT-PCR. The obtained data were analysed using the program "IBM SPSS Statistics 29.0". Haplotype analysis was performed using the online program "SNPStats". RESULTS The TERC rs12696304 G allele of this SNP is associated with 1.4-fold lower odds of developing MS (p = 0.035). TERC rs35073794 is associated with approximately 2.4-fold reduced odds of MS occurrence in the codominant, dominant, overdominant, and additive models (p < 0.001; p < 0.001; p < 0.001; p < 0.001, respectively). Haplotype analysis shows that the rs1760904-G-rs1713418-A haplotype is statistically significantly associated with 1.75-fold increased odds of developing MS (p = 0.006). The rs12696304-C-rs35073794-A haplotype is statistically significantly associated with twofold decreased odds of developing MS (p = 0.008). In addition, the rs12696304-G-rs35073794-A haplotype was found to be statistically significantly associated with 5.3-fold decreased odds of developing MS (p < 0.001). CONCLUSION The current evidence may suggest a protective role of TERC SNP in the occurrence of MS, while TEP1 has the opposite effect.
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Affiliation(s)
- Gintarė Rumšaitė
- Medical Faculty, Lithuanian University of Health Sciences, LT-50161 Kaunas, Lithuania;
| | - Greta Gedvilaitė
- Medical Faculty, Lithuanian University of Health Sciences, LT-50161 Kaunas, Lithuania;
- Neurosciences Institute, Medical Academy, Lithuanian University of Health Sciences, LT-50161 Kaunas, Lithuania; (L.K.); (R.L.)
| | - Renata Balnytė
- Department of Neurology, Medical Academy, Lithuanian University of Health Sciences, LT-50161 Kaunas, Lithuania;
| | - Loresa Kriaučiūnienė
- Neurosciences Institute, Medical Academy, Lithuanian University of Health Sciences, LT-50161 Kaunas, Lithuania; (L.K.); (R.L.)
| | - Rasa Liutkevičienė
- Neurosciences Institute, Medical Academy, Lithuanian University of Health Sciences, LT-50161 Kaunas, Lithuania; (L.K.); (R.L.)
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Immunoepigenetic Regulation of Inflammatory Bowel Disease: Current Insights into Novel Epigenetic Modulations of the Systemic Immune Response. Genes (Basel) 2023; 14:genes14030554. [PMID: 36980826 PMCID: PMC10047925 DOI: 10.3390/genes14030554] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2023] [Revised: 02/18/2023] [Accepted: 02/20/2023] [Indexed: 02/25/2023] Open
Abstract
The immune system and environmental factors are involved in various diseases, such as inflammatory bowel disease (IBD), through their effect on genetics, which modulates immune cells. IBD encompasses two main phenotypes, Crohn’s disease, and ulcerative colitis, which are manifested as chronic and systemic relapse-remitting gastrointestinal tract disorders with rising global incidence and prevalence. The pathophysiology of IBD is complex and not fully understood. Epigenetic research has resulted in valuable information for unraveling the etiology of this immune-mediated disease. Thus, the main objective of the present review is to summarize the current findings on the role of epigenetic mechanisms in IBD to shed light on their potential clinical relevance. This review focuses on the latest evidence regarding peripheral blood mononuclear cells and epigenetic changes in histone modification, DNA methylation, and telomere shortening in IBD. The various identified epigenetic DNA profiles with clinical value in IBD could be used as biomarkers for more accurately predicting disease development, treatment response, and therapy-related adverse events. Ultimately, the information presented here could be of potential relevance for future clinical practice in developing more efficient and precise medicine to improve the quality of life for patients with IBD.
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Goswami A, Huda N, Yasmin T, Hosen MI, Hasan AKMM, Nabi AHMN. Association study of leukocyte telomere length and genetic polymorphism within hTERT promoter with type 2 diabetes in Bangladeshi population. Mol Biol Rep 2021; 48:285-295. [PMID: 33389530 DOI: 10.1007/s11033-020-06045-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 11/28/2020] [Indexed: 12/12/2022]
Abstract
Telomeres are protective cap on the ends of DNA of non-coding tandem repeats of TTAGGG. Human telomerase reverse transcriptase (hTERT) is a catalytic subunit of telomerase that maintains the structure of telomeres. Type 2 diabetes (T2D) affects multi-organ and telomere length by altering telomerase activity. We aimed to evaluate the relative telomere length (RTL) and risk association of rs2853669 with T2D in Bangladeshi population. RTL was measured in 408 unrelated Bangladeshi (224 T2D and 184 healthy) using primers for target gene and reference gene albumin. Genotypic frequencies for rs2853669 were determined using TaqMan® probes. The mean level of age adjusted RTL (AARTL) varied significantly between the healthy and individuals with T2D for all the genotypes with respect to rs2853669. Moreover, healthy individuals had significantly higher AARTL than T2D. Similar findings were observed when study participants were stratified based on their gender. Association studies revealed that under codominant model of inheritance, TC genotype showed protective role against development of type 2 diabetes. This study suggests a possible role of telomere biology in T2DM, but their association needs to be evaluated further with a larger series and matched healthy controls.
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Affiliation(s)
- Atoll Goswami
- Department of Biochemistry and Molecular Biology, University of Dhaka, Dhaka-1000, Bangladesh
| | - Nafiul Huda
- Department of Biochemistry and Molecular Biology, University of Dhaka, Dhaka-1000, Bangladesh
| | - Tahirah Yasmin
- Department of Biochemistry and Molecular Biology, University of Dhaka, Dhaka-1000, Bangladesh
| | - Md Ismail Hosen
- Department of Biochemistry and Molecular Biology, University of Dhaka, Dhaka-1000, Bangladesh
| | - A K M Mahbub Hasan
- Department of Biochemistry and Molecular Biology, University of Dhaka, Dhaka-1000, Bangladesh
| | - A H M Nurun Nabi
- Department of Biochemistry and Molecular Biology, University of Dhaka, Dhaka-1000, Bangladesh.
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Melicher D, Illés A, Littvay L, Tárnoki ÁD, Tárnoki DL, Bikov A, Kunos L, Csabán D, Buzás EI, Molnár MJ, Falus A. Positive association and future perspectives of mitochondrial DNA copy number and telomere length - a pilot twin study. Arch Med Sci 2021; 17:1191-1199. [PMID: 34522248 PMCID: PMC8425227 DOI: 10.5114/aoms.2019.83173] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 10/31/2018] [Indexed: 11/22/2022] Open
Abstract
INTRODUCTION Recent experimental and population studies have highlighted the existence of telomere-mitochondria interplay. Besides studies revealing the molecular mechanisms underlying the associations of telomere defects and mitochondrial functions, investigations of mitochondrial DNA copy number (mtDNAcn) and telomere length (TL) in healthy and disease phenotypes have likewise begun, with the aim of gaining more insights about their relationship in humans. MATERIAL AND METHODS A total of 142 asymptomatic adult twins, comprising 96 monozygotic (MZ) and 46 dizygotic (DZ) twins (mean age: 50.54 ±15.43 years), members of the Hungarian Twin Registry, were included in the analysis. Applying the qPCR standard curve method, we investigated the relationship of mtDNA copy number, telomere length and clinical data, besides assessing co-twin similarities of MZ and DZ twins for their mtDNAcn and TL measures. RESULTS We found that twins were similar in their intraclass correlation coefficients irrespective of zygosity, suggesting a possibly more important role of common (shared) environmental factors compared to non-shared (unique) environmental and to a smaller degree also individual genetic influences. We confirmed a significant positive association between mtDNAcn and TL (r = 0.28, p < 0.01) in age- and sex-corrected analysis. Following bivariate estimates and correction with significant predictors, the independent positive associations were further verified. CONCLUSIONS Our results extend the until now modest number of studies investigating mtDNAcn and TL simultaneously in humans. In addition, we are the first to examine the relationship between mtDNAcn and telomere length in MZ and DZ twin subjects.
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Affiliation(s)
- Dóra Melicher
- Department of Genetics, Cell and Immunobiology, Semmelweis University, Budapest, Hungary
- MTA-SE Immunproteogenomics Extracellular Vesicle Research Group
- Hungarian Twin Registry, Budapest, Hungary
| | - Anett Illés
- Institute of Genomic Medicine and Rare Disorders, Semmelweis University, Budapest, Hungary
| | - Levente Littvay
- Hungarian Twin Registry, Budapest, Hungary
- Central European University, Budapest, Hungary
| | - Ádám Domonkos Tárnoki
- Hungarian Twin Registry, Budapest, Hungary
- Department of Radiology, Semmelweis University, Budapest, Hungary
| | - Dávid László Tárnoki
- Hungarian Twin Registry, Budapest, Hungary
- Department of Radiology, Semmelweis University, Budapest, Hungary
| | - András Bikov
- Department of Pulmonology, Semmelweis University, Budapest, Hungary
| | - László Kunos
- Department of Pulmonology, Semmelweis University, Budapest, Hungary
| | - Dóra Csabán
- Institute of Genomic Medicine and Rare Disorders, Semmelweis University, Budapest, Hungary
| | - Edit Irén Buzás
- Department of Genetics, Cell and Immunobiology, Semmelweis University, Budapest, Hungary
- MTA-SE Immunproteogenomics Extracellular Vesicle Research Group
| | - Mária Judit Molnár
- Institute of Genomic Medicine and Rare Disorders, Semmelweis University, Budapest, Hungary
| | - András Falus
- Department of Genetics, Cell and Immunobiology, Semmelweis University, Budapest, Hungary
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Baumer Y, Farmer N, Premeaux TA, Wallen GR, Powell-Wiley TM. Health Disparities in COVID-19: Addressing the Role of Social Determinants of Health in Immune System Dysfunction to Turn the Tide. Front Public Health 2020; 8:559312. [PMID: 33134238 PMCID: PMC7578341 DOI: 10.3389/fpubh.2020.559312] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Accepted: 08/31/2020] [Indexed: 12/28/2022] Open
Abstract
It is evident that health disparities exist during the COVID-19 pandemic, a pandemic caused by the novel coronavirus SARS-CoV-2. Underlying reasons for COVID-19 health disparities are multi-factorial. However, social determinants, including those regarding socioeconomic status, social inequalities, health behaviors, and stress, may have implications on these disparities. Exposure to one or more of these social determinants is associated with heightened inflammatory responses, particularly increases in the cytokine interleukin-6 (IL-6), as well as immune system dysfunction. Thus, an amplified effect during COVID-19 could occur, potentially resulting in vulnerable patients experiencing an intensified cytokine storm due to a hyperactive and dysfunctional immune response. Further understanding how social determinants play a mechanistic role in COVID-19 disparities could potentially help reduce health disparities overall and in future pandemics.
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Affiliation(s)
- Yvonne Baumer
- Social Determinants of Obesity and Cardiovascular Risk Laboratory, Cardiovascular Branch, Division of Intramural Research, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, United States
| | - Nicole Farmer
- National Institutes of Health, Clinical Center, Bethesda, MD, United States
| | - Thomas A. Premeaux
- Social Determinants of Obesity and Cardiovascular Risk Laboratory, Cardiovascular Branch, Division of Intramural Research, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, United States
| | - Gwenyth R. Wallen
- National Institutes of Health, Clinical Center, Bethesda, MD, United States
| | - Tiffany M. Powell-Wiley
- Social Determinants of Obesity and Cardiovascular Risk Laboratory, Cardiovascular Branch, Division of Intramural Research, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, United States
- Intramural Research Program, National Institute on Minority Health and Health Disparities, Bethesda, MD, United States
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Navarro-Mateu F, Rubio-Aparicio M, Cayuela P, Álvarez FJ, Roca-Vega A, Chirlaque MD, Cayuela ML, Husky M, Martínez S, Sánchez-Meca J. The association of telomere length with substance use disorders: systematic review and meta-analysis protocol. Syst Rev 2019; 8:298. [PMID: 31787100 PMCID: PMC6886210 DOI: 10.1186/s13643-019-1199-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Accepted: 10/15/2019] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND The present protocol was designed for a systematic review and meta-analysis aimed at determining the association of telomere length with substance use disorders with the exclusion of nicotine addiction, and to identify potential moderators of the effect of telomere length. Such methodological information may provide guidance to improve the quality of future research on this important topic. METHODS Potential studies will be identified through electronic databases (PubMed/MEDLINE, EMBASE, PsycINFO, and Web of Science) up from inception onwards. The inclusion criteria will include published or unpublished observational studies (cohort, case-control, and cross-sectional studies) reporting telomere length in adult patients with substance use disorder compared with a control group. Non-human studies or other study designs such as reviews, case-only, family-based, and/or population studies with only healthy participants will be excluded, as well as those focused solely on nicotine addiction. The main outcome will be telomere length in adults with substance use disorder (primary) and, specifically, in those with alcohol use disorder (secondary). Two investigators will independently evaluate the preselected studies for possible inclusion and will extract data following a standardized protocol. Disagreements will be resolved by consensus. The risk of bias of all included studies will be assessed using the Newcastle-Ottawa Quality Assessment Scale for non-randomized studies. Data will be converted into standardized mean differences as effect size index, and random-effects models will be used for the meta-analysis. Cochran's Q statistic, I2 index, and visual inspection of the forest plot will be used to verify study heterogeneity. Subgroup analyses and meta-regressions will be conducted to ascertain heterogeneity. Several sensitivity analyses will be conducted to address the influence of potential confounding factors. Publication bias will be examined using the "funnel plot" method with Duval and Tweedie's trim-and-fill method and Egger test. DISCUSSION This systematic review will assess the association of telomere length with substance use disorders aside from nicotine addiction. SYSTEMATIC REVIEW REGISTRATION PROSPERO registration number CRD42019119785.
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Affiliation(s)
- Fernando Navarro-Mateu
- Unidad de Docencia, Investigación y Formación en Salud Mental (UDIF-SM), Servicio Murciano de Salud, c/ Lorca, n° 58, 30120, Murcia, Spain. .,CIBER de Epidemiología y Salud Pública (CIBERESP), Madrid, Spain. .,IMIB-Arrixaca, Murcia, Spain. .,Departamento de Psicología Básica y Metodología, University of Murcia, Murcia, Spain.
| | | | - Pedro Cayuela
- Escuela Universitaria de Enfermería de Cartagena, University of Murcia, Murcia, Spain
| | - Francisco-Javier Álvarez
- Unidad de Docencia, Investigación y Formación en Salud Mental (UDIF-SM), Servicio Murciano de Salud, c/ Lorca, n° 58, 30120, Murcia, Spain
| | - Agustín Roca-Vega
- Biblioteca Virtual MurciaSalud, Centro Tecnológico de Información y Documentación Sanitaria, Servicio Murciano de Salud, Murcia, Spain
| | - María Dolores Chirlaque
- CIBER de Epidemiología y Salud Pública (CIBERESP), Madrid, Spain.,IMIB-Arrixaca, Murcia, Spain.,Servicio de Epidemiología, Consejería de Salud, Murcia, Spain.,Departamento de Ciencias Sociosanitarias, University of Murcia, Murcia, Spain
| | - María Luisa Cayuela
- IMIB-Arrixaca, Murcia, Spain.,Grupo Telomerasa, Cáncer y Envejecimiento, Hospital Clínico Universitario Virgen de la Arrixaca, Murcia, Spain
| | - Mathilde Husky
- Laboratoire de Psychologie EA4139, Université de Bordeaux, Bordeaux, France
| | | | - Julio Sánchez-Meca
- Departamento de Psicología Básica y Metodología, University of Murcia, Murcia, Spain
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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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Weber J, Jörres R, Kronseder A, Müller A, Weigl M, Chmelar C. Learning on the job, the use of selection, optimization, and compensation strategies, and their association with telomere length as an indicator of biological aging. Int Arch Occup Environ Health 2019; 92:361-370. [PMID: 30671630 DOI: 10.1007/s00420-019-01408-5] [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] [Received: 10/23/2017] [Accepted: 01/14/2019] [Indexed: 10/27/2022]
Abstract
PURPOSE Due to the increased need for retention of older workforce caused by demographic changes in industrialized countries, support of healthy aging in occupational settings is of increasing relevance. This study examines the relationship between leucocyte telomere length (LTL), a potential biomarker for biological aging, and selection, optimization, and compensation (SOC) and learning opportunities as strategies involving efficient management and gain of resources at work. METHODS Within a cross-sectional study, blood samples were drawn from 141 geriatric care professionals to measure LTL by quantitative real-time polymerase-chain reaction. Furthermore, all participants were asked with standardized questionnaires to rate their learning opportunities at work and use of SOC strategies. Analyses were performed by multiple linear regressions. RESULTS SOC use, especially compensation, tended to be negatively, and learning opportunities tended to be positively associated with LTL. Furthermore, a significant interaction was found between optimization and learning opportunities, such that LTL and learning opportunities were only positively associated when optimization was high. CONCLUSIONS Resources at work were weakly associated with telomere length, which is not unexpected in view of the multiplicity of factors affecting LTL. The results further suggest that a mismatch between SOC and learning opportunities may negatively affect successful aging. They also suggest that more detailed research on biological aging and its relation to resources at work is needed.
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Affiliation(s)
- Jeannette Weber
- Institute of Occupational, Social and Environmental Medicine, Centre for Health and Society, Faculty of Medicine, Heinrich-Heine-University of Düsseldorf, Moorenstr. 5, 40225, Düsseldorf, Germany.
| | - Rudolf Jörres
- Institute and Outpatient Clinic for Occupational, Social and Environmental Medicine, Ludwig-Maximilians-University Munich, Ziemssenstr.1, 80336, Munich, Germany
| | - Angelika Kronseder
- Institute and Outpatient Clinic for Occupational, Social and Environmental Medicine, Ludwig-Maximilians-University Munich, Ziemssenstr.1, 80336, Munich, Germany
| | - Andreas Müller
- Institute of Occupational, Social and Environmental Medicine, Centre for Health and Society, Faculty of Medicine, Heinrich-Heine-University of Düsseldorf, Moorenstr. 5, 40225, Düsseldorf, Germany.,Work and Organizational Psychology, Faculty of Education, University Duisburg-Essen, Universitätsstr. 2, 45141, Essen, Germany
| | - Matthias Weigl
- Institute and Outpatient Clinic for Occupational, Social and Environmental Medicine, Ludwig-Maximilians-University Munich, Ziemssenstr.1, 80336, Munich, Germany
| | - Caroline Chmelar
- Institute and Outpatient Clinic for Occupational, Social and Environmental Medicine, Ludwig-Maximilians-University Munich, Ziemssenstr.1, 80336, Munich, Germany
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Melicher D, Illés A, Pállinger É, Kovács ÁF, Littvay L, Tárnoki ÁD, Tárnoki DL, Bikov A, Molnár MJ, Buzás EI, Falus A. Tight co-twin similarity of monozygotic twins for hTERT protein level of T cell subsets, for telomere length and mitochondrial DNA copy number, but not for telomerase activity. Cell Mol Life Sci 2018; 75:2447-2456. [PMID: 29290038 PMCID: PMC11105316 DOI: 10.1007/s00018-017-2738-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 11/30/2017] [Accepted: 12/21/2017] [Indexed: 01/02/2023]
Abstract
Our study analyzed lymphocyte subpopulations of 32 monozygotic twins and compared the level of the catalytic reverse transcriptase protein subunit (hTERT) in T lymphocytes (Tly), helper- (Th), cytotoxic- (Tc) and regulatory T cell (Treg) subgroups. Four variables related to telomere and mitochondrial biology were simultaneously assessed, applying multi-parametric flow cytometry, TRAP-ELISA assay and qPCR standard curve method on peripheral blood mononuclear cell (PBMC) samples of genetically matched individuals. Twin data of telomerase activity (TA), hTERT protein level, telomere length (TL) and mitochondrial DNA copy number (mtDNAcn) were analyzed for co-twin similarity. The present study has provided novel information by demonstrating very high intraclass correlation (ICC) of hTERT protein level in T lymphocytes (0.891) and in both Th (0.896), Treg (0.885) and Tc (0.798) cell subgroups. When comparing results measured from PBMCs, intraclass correlation was also high for telomere length (0.815) and considerable for mtDNA copy number (0.524), and again exceptionally high for the rate-limiting telomerase subunit, hTERT protein level (0.946). In contrast, telomerase activity showed no co-twin similarity (ICC 0). By comparing relative amounts of hTERT protein levels in different lymphocyte subgroups of twin subjects, in Treg cells significantly higher level could be detected compared to Tly, Th or Tc cell subgroups. This is the first study that simultaneously analyzed co-twin similarity in MZ twins for the above four variables and alongside assessed their relationship, whereby positive association was found between TL and mtDNAcn.
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Affiliation(s)
- Dóra Melicher
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
- Hungarian Twin Registry, Budapest, Hungary
- MTA-SE Immunproteogenomics Extracellular Vesicle Research Group, Budapest, Hungary
| | - Anett Illés
- Institute of Genomic Medicine and Rare Disorders, Semmelweis University, Budapest, Hungary
| | - Éva Pállinger
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | - Árpád Ferenc Kovács
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | - Levente Littvay
- Hungarian Twin Registry, Budapest, Hungary
- Central European University, Budapest, Hungary
| | - Ádám Domonkos Tárnoki
- Hungarian Twin Registry, Budapest, Hungary
- Department of Radiology, Semmelweis University, Budapest, Hungary
| | - Dávid László Tárnoki
- Hungarian Twin Registry, Budapest, Hungary
- Department of Radiology, Semmelweis University, Budapest, Hungary
| | - András Bikov
- Department of Pulmonology, Semmelweis University, Budapest, Hungary
| | - Mária Judit Molnár
- Institute of Genomic Medicine and Rare Disorders, Semmelweis University, Budapest, Hungary
| | - Edit Irén Buzás
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
- MTA-SE Immunproteogenomics Extracellular Vesicle Research Group, Budapest, Hungary
| | - András Falus
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary.
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Gutmajster E, Chudek J, Augusciak-Duma A, Szwed M, Szybalska A, Mossakowska M, Puzianowska-Kuznicka M, Wiecek A, Sieron AL. Possible association of the TERT promoter polymorphisms rs2735940, rs7712562 and rs2853669 with diabetes mellitus in obese elderly Polish population: results from the national PolSenior study. J Appl Genet 2018; 59:291-299. [PMID: 29938393 PMCID: PMC6060992 DOI: 10.1007/s13353-018-0450-9] [Citation(s) in RCA: 3] [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: 02/01/2018] [Revised: 05/25/2018] [Accepted: 06/08/2018] [Indexed: 12/12/2022]
Abstract
One of the markers of aging is lymphocyte telomere length (LTL), which is affected by genetic constitution of the organism and environmental conditions, such as development and diseases, including diabetes. The relationship of the later seems to be bilateral. The enzyme responsible for the maintenance of telomere length is a subunit of telomerase-telomerase reverse transcriptase (TERT). The aims of the present study were to (1) determine the influence of the TERT promoter sequence SNP variants on relative telomere length (RTL) in an elderly Polish population and (2) explore the potential associations of the SNPs with the type 2 diabetes mellitus (T2DM) in the obese individuals. Two highly homogenous subgroups of PolSenior participants were investigated, the first constituted 70 relatively healthy respondents and the second 70 individuals with T2DM. Telomere length ratio (T/S value) was measured; 1.5 kb part upstream of the transcription start site of the TERT promoter was sequenced, and the frequencies of polymorphisms were calculated and compared against analysed data. Low-frequency SNPs were evaluated but excluded from further comparative analyses to RTL and glucose metabolism markers. No significant difference in telomere length was found between the two studied subgroups. Univariate statistical analyses showed only a weak association of environmental or genetic factors altering this marker of aging. Approximate frequency of four SNPs in TERT promoter sequence was assessed in Polish population aged 65-95 years, but three of them (rs2735940, rs7712562 and rs2853669) were selected for further analyses. The SNP selection was based on their minor allele frequencies in general population and on published data. The univariate analysis has revealed that carriers of CC SNP (rs2853669) have had the shortest RTL in the T2DM group. Multivariate analysis has also revealed that the genetic effect of TERT promoter CC SNP was strengthened by the incidence of T2DM. The additional variation in RTL in paired groups indicates that in addition to T2DM and genetics, there are other factors contributing to development of the age-related diseases.
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Affiliation(s)
- Ewa Gutmajster
- Department of Molecular Biology and Genetics, School of Medicine in Katowice, Medical University of Silesia in Katowice, 18 Medykow Street, 40-752, Katowice, Poland
| | - Jerzy Chudek
- Department of Internal Medicine and Oncological Chemotherapy, School of Medicine in Katowice, Medical University of Silesia in Katowice, 40-027, Katowice, Poland
| | - Aleksandra Augusciak-Duma
- Department of Molecular Biology and Genetics, School of Medicine in Katowice, Medical University of Silesia in Katowice, 18 Medykow Street, 40-752, Katowice, Poland
| | - Malgorzata Szwed
- Department of Human Epigenetics, Mossakowski Medical Research Centre, 02-106, Warsaw, Poland
| | | | | | - Monika Puzianowska-Kuznicka
- Department of Human Epigenetics, Mossakowski Medical Research Centre, 02-106, Warsaw, Poland
- Department of Geriatrics and Gerontology, Medical Centre of Postgraduate Education, 01-813, Warsaw, Poland
| | - Andrzej Wiecek
- Department of Nephrology, Transplantation and Internal Medicine, Medical University of Silesia, 40-027, Katowice, Poland
| | - Aleksander L Sieron
- Department of Molecular Biology and Genetics, School of Medicine in Katowice, Medical University of Silesia in Katowice, 18 Medykow Street, 40-752, Katowice, Poland.
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Thanseem I, Viswambharan V, Poovathinal SA, Anitha A. Is telomere length a biomarker of neurological disorders? Biomark Med 2017; 11:799-810. [PMID: 30669856 DOI: 10.2217/bmm-2017-0032] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Telomeres are DNA-protein complexes that form protective caps at the termini of chromosomes, maintaining genomic stability. In this review, we provide a comprehensive overview on the usefulness of telomere length (TL) as biomarkers of neurological disorders. The implications of TL in relation to cognitive ability, cognitive aging and cognitive decline in neurodegenerative disorders are also briefly discussed. Our review suggests that at present it is difficult to draw a reliable conclusion regarding the contribution of TL to neurological disorders. Further, it needs to be examined whether leukocyte TL, which is generally considered as a surrogate marker of TL in other tissues, serves as an indicator of central nervous system TL.
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Affiliation(s)
- Ismail Thanseem
- Department of Neurogenetics, Institute for Communicative & Cognitive Neurosciences (ICCONS), Shoranur, Palakkad 679 523, Kerala, India
| | - Vijitha Viswambharan
- Department of Neurogenetics, Institute for Communicative & Cognitive Neurosciences (ICCONS), Shoranur, Palakkad 679 523, Kerala, India
| | - Suresh A Poovathinal
- Department of Neurology, Institute for Communicative & Cognitive Neurosciences (ICCONS), Shoranur, Palakkad 679 523, Kerala, India
| | - Ayyappan Anitha
- Department of Neurogenetics, Institute for Communicative & Cognitive Neurosciences (ICCONS), Shoranur, Palakkad 679 523, Kerala, India
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12
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Kumar A, Nilednu P, Kumar A, Sharma NK. Epigenetic perturbation driving asleep telomerase reverse transcriptase: Possible therapeutic avenues in carcinoma. Tumour Biol 2017; 39:1010428317695951. [DOI: 10.1177/1010428317695951] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
In the last decade, implications of human telomerase reverse transcriptase (hTERT), a component of ribonucleoprotein telomerase in aging, senescence, and stem cell are highly evident. Besides, the activation of hTERT is also being documented several cancer types including carcinoma. The awakening of telomerase during carcinoma initiation and development is being seen with different perspectives including genetic and epigenetic tools and events. In view of several tumor progenitors genes (also referred as epigenetic mediators), telomerase is placed as key enzyme to achieve the carcinoma phenotype and sustain during the progression. It is true that swaying of telomerase in carcinoma could be facilitated with dedicated set of epigenetic modulators and modifiers players. These epigenetic alterations are heritable, potentially reversible, and seen as the epigenetic signature of carcinoma. Several papers converge to suggest that DNA methylation, histone modification, and small non-coding RNAs are the widely appreciated epigenetic changes towards hTERT modulation. In this review, we summarize the contribution of epigenetic factors in the telomerase activation and discuss potential avenues to achieve therapeutic intervention in carcinoma.
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Affiliation(s)
- Ajay Kumar
- Cancer and Translational Research Lab, Department of Biotechnology, Dr. D. Y. Patil Biotechnology & Bioinformatics Institute, Dr. D. Y. Patil Vidyapeeth, Pune, Pune, India
| | - Pritish Nilednu
- Cancer and Translational Research Lab, Department of Biotechnology, Dr. D. Y. Patil Biotechnology & Bioinformatics Institute, Dr. D. Y. Patil Vidyapeeth, Pune, Pune, India
| | - Azad Kumar
- Cancer and Translational Research Lab, Department of Biotechnology, Dr. D. Y. Patil Biotechnology & Bioinformatics Institute, Dr. D. Y. Patil Vidyapeeth, Pune, Pune, India
| | - Nilesh Kumar Sharma
- Cancer and Translational Research Lab, Department of Biotechnology, Dr. D. Y. Patil Biotechnology & Bioinformatics Institute, Dr. D. Y. Patil Vidyapeeth, Pune, Pune, India
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13
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Hane AA, Fox NA. Early Caregiving and Human Biobehavioral Development: A Comparative Physiology Approach. Curr Opin Behav Sci 2016; 7:82-90. [PMID: 26753173 DOI: 10.1016/j.cobeha.2015.12.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A large and growing body of evidence demonstrates associations between quality of the early caregiving environment and risk for stress-related illness across the lifespan. The recent research examining associations between early caregiving environments and subsequent development is reviewed, with particular attention to early programming and subsequent malleability of systems underlying stress responsivity. A developmental comparative physiology model is suggested; one in which postnatal programming and phenotypic plasticity act in concert as mechanisms underlying the persisting effects of early care environments for biobehavioral outcomes.
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14
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Raschenberger J, Kollerits B, Titze S, Köttgen A, Bärthlein B, Ekici AB, Forer L, Schönherr S, Weissensteiner H, Haun M, Wanner C, Eckardt KU, Kronenberg F. Do telomeres have a higher plasticity than thought? Results from the German Chronic Kidney Disease (GCKD) study as a high-risk population. Exp Gerontol 2015; 72:162-6. [DOI: 10.1016/j.exger.2015.09.019] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Revised: 09/04/2015] [Accepted: 09/26/2015] [Indexed: 11/17/2022]
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