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Gomatou G, Masaoutis C, Vamvakaris I, Kotteas E, Bouros E, Tzilas V, Bouros D. Differential immunohistochemical expression of hTERT in lung cancer patients with and without idiopathic pulmonary fibrosis. Pulmonology 2024; 30:214-221. [PMID: 35153179 DOI: 10.1016/j.pulmoe.2021.12.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 12/05/2021] [Accepted: 12/08/2021] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Human telomerase reverse transcriptase (hTERT) is the catalytic subunit of telomerase enzyme, which adds nucleotides to telomeres and counteracts their length shortening. The development of a telomere maintenance mechanism represents a hallmark of cancer. On the other hand, idiopathic pulmonary fibrosis (IPF) is associated with mutations in telomerase genes and shorter telomeres. IPF is frequently complicated with lung cancer. AIM To investigate the expression of hTERT in lung cancer with co-existing IPF and to compare with lung cancer without fibrosis. METHODS Diagnostic lung cancerous biopsies were retrieved from 18 patients with lung cancer and concomitant IPF, as well as 18 age and gender matched controls with lung cancer without pulmonary fibrosis. The expression of hTERT was studied with immunohistochemistry. ImajeJ software was used to quantitate subcellular stain intensity. Immunohistochemical investigation of two senescence-associated markers, p16 and p21, was also performed in all 36 cases. RESULTS Both groups highly expressed hTERT, without significant difference (100% vs 95%, p = 0.521). Evaluation of p16 and p21 immunostaining revealed negative to minimal immunoreactivity in both groups. hTERT localization exhibited higher median nuclear intensity in the group of lung cancer with IPF (0.62 vs 0.45, p = 0.016), while cytoplasmic intensity did not differ significantly (0.17 vs 0.15, p = 0.463). Higher median nuclear intensity was also correlated with small cell lung cancer subtype in the whole study sample (0.69 vs 0.45, p = 0.09). CONCLUSION hTERT is highly expressed in lung cancer with concomitant IPF, but with differential localization compared to lung cancer without IPF, implying differences in pathogenicity and requiring further investigation.
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Affiliation(s)
- G Gomatou
- Interstitial Lung Diseases Unit, 1st Department of Respiratory Medicine, "Sotiria" Hospital for Diseases of the Chest, National and Kapodistrian University of Athens, Athens, Greece; Oncology Unit, Third Department of Medicine, "Sotiria" Hospital for Diseases of the Chest, National and Kapodistrian University of Athens, Athens, Greece.
| | - C Masaoutis
- 1st Department of Pathology, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - I Vamvakaris
- Department of Pathology, "Sotiria" Hospital for Diseases of the Chest, Athens, Greece
| | - E Kotteas
- Oncology Unit, Third Department of Medicine, "Sotiria" Hospital for Diseases of the Chest, National and Kapodistrian University of Athens, Athens, Greece
| | - E Bouros
- Interstitial Lung Diseases Unit, 1st Department of Respiratory Medicine, "Sotiria" Hospital for Diseases of the Chest, National and Kapodistrian University of Athens, Athens, Greece
| | - V Tzilas
- Center for Diseases of the Chest, Athens Medical Center, Athens, Greece
| | - D Bouros
- Interstitial Lung Diseases Unit, 1st Department of Respiratory Medicine, "Sotiria" Hospital for Diseases of the Chest, National and Kapodistrian University of Athens, Athens, Greece; Center for Diseases of the Chest, Athens Medical Center, Athens, Greece
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Ghanim GE, Sekne Z, Balch S, van Roon AMM, Nguyen THD. 2.7 Å cryo-EM structure of human telomerase H/ACA ribonucleoprotein. Nat Commun 2024; 15:746. [PMID: 38272871 PMCID: PMC10811338 DOI: 10.1038/s41467-024-45002-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Accepted: 01/03/2024] [Indexed: 01/27/2024] Open
Abstract
Telomerase is a ribonucleoprotein (RNP) enzyme that extends telomeric repeats at eukaryotic chromosome ends to counterbalance telomere loss caused by incomplete genome replication. Human telomerase is comprised of two distinct functional lobes tethered by telomerase RNA (hTR): a catalytic core, responsible for DNA extension; and a Hinge and ACA (H/ACA) box RNP, responsible for telomerase biogenesis. H/ACA RNPs also have a general role in pseudouridylation of spliceosomal and ribosomal RNAs, which is critical for the biogenesis of the spliceosome and ribosome. Much of our structural understanding of eukaryotic H/ACA RNPs comes from structures of the human telomerase H/ACA RNP. Here we report a 2.7 Å cryo-electron microscopy structure of the telomerase H/ACA RNP. The significant improvement in resolution over previous 3.3 Å to 8.2 Å structures allows us to uncover new molecular interactions within the H/ACA RNP. Many disease mutations are mapped to these interaction sites. The structure also reveals unprecedented insights into a region critical for pseudouridylation in canonical H/ACA RNPs. Together, our work advances understanding of telomerase-related disease mutations and the mechanism of pseudouridylation by eukaryotic H/ACA RNPs.
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Affiliation(s)
| | - Zala Sekne
- MRC Laboratory of Molecular Biology, Cambridge, CB2 0QH, UK
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Orabi MAA, Abdelhamid RA, Elimam H, Elshaier YAMM, Ali AA, Aldabaan N, Alhasaniah AH, Refaey MS. Furofuranoid-Type Lignans and Related Phenolics from Anisacanthus virgularis (Salisb.) Nees with Promising Anticholinesterase and Anti-Ageing Properties: A Study Supported by Molecular Modelling. PLANTS (BASEL, SWITZERLAND) 2024; 13:150. [PMID: 38256704 PMCID: PMC10820861 DOI: 10.3390/plants13020150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2023] [Revised: 12/23/2023] [Accepted: 01/03/2024] [Indexed: 01/24/2024]
Abstract
Lignan phytomolecules demonstrate promising anti-Alzheimer activity by alleviating dementia and preserving nerve cells. The purpose of this work is to characterize the lignans of Anisacanthus virgularis and explore their potential anti-acetylcholinesterase and anti-ageing effects. Phytochemical investigation of A. virgularis aerial parts afforded a new furofuranoid-type lignan (1), four known structural analogues, namely pinoresinol (2), epipinoresinol (3), phillyrin (4), and pinoresinol 4-O-β-d-glucoside (5), in addition to p-methoxy-trans-methyl cinnamate (6) and 1H-indole-3-carboxaldehyde (7). The structures were established from thorough spectroscopic analyses and comparisons with the literature. Assessment of the anticholinesterase activity of the lignans 1-5 displayed noticeable enzyme inhibition of 1 (IC50 = 85.03 ± 4.26 nM) and 5 (64.47 ± 2.75 nM) but lower activity of compounds 2-4 as compared to the reference drug donepezil. These findings were further emphasized by molecular docking of 1 and 5 with acetylcholinesterase (AChE). Rapid overlay chemical similarity (ROCS) and structure-activity relationships (SAR) analysis highlighted and rationalized the anti-AD capability of these compounds. Telomerase activation testing of the same isolates revealed 1.64-, 1.66-, and 1.72-fold activations in cells treated with compounds 1, 5, and 4, respectively, compared to untreated cells. Our findings may pave the way for further investigations into the development of anti-Alzheimer and/or anti-ageing drugs from furofuranoid-type lignans.
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Affiliation(s)
- Mohamed A. A. Orabi
- Department of Pharmacognosy, College of Pharmacy, Najran University, Najran 66454, Saudi Arabia
| | - Reda A. Abdelhamid
- Department of Pharmacognosy, Faculty of Pharmacy, Al-Azhar University, Assiut-Branch, Assiut 71524, Egypt;
| | - Hanan Elimam
- Department of Biochemistry, Faculty of Pharmacy, University of Sadat City, Sadat City 32958, Egypt;
| | - Yaseen A. M. M. Elshaier
- Department of Organic and Medicinal Chemistry, Faculty of Pharmacy, University of Sadat City, Sadat City 32958, Egypt;
| | - Ahmed A. Ali
- Department of Pharmacognosy, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt;
| | - Nayef Aldabaan
- Department of Pharmacology, College of Pharmacy, Najran University, Najran 66454, Saudi Arabia;
| | - Abdulaziz Hassan Alhasaniah
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, Najran University, Najran 66454, Saudi Arabia;
| | - Mohamed S. Refaey
- Department of Pharmacognosy, Faculty of Pharmacy, University of Sadat City, Sadat City 32958, Egypt
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4
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Rakotopare J, Toledo F. p53 in the Molecular Circuitry of Bone Marrow Failure Syndromes. Int J Mol Sci 2023; 24:14940. [PMID: 37834388 PMCID: PMC10573108 DOI: 10.3390/ijms241914940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 10/02/2023] [Accepted: 10/04/2023] [Indexed: 10/15/2023] Open
Abstract
Mice with a constitutive increase in p53 activity exhibited features of dyskeratosis congenita (DC), a bone marrow failure syndrome (BMFS) caused by defective telomere maintenance. Further studies confirmed, in humans and mice, that germline mutations affecting TP53 or its regulator MDM4 may cause short telomeres and alter hematopoiesis, but also revealed features of Diamond-Blackfan anemia (DBA) or Fanconi anemia (FA), two BMFSs, respectively, caused by defects in ribosomal function or DNA repair. p53 downregulates several genes mutated in DC, either by binding to promoter sequences (DKC1) or indirectly via the DREAM repressor complex (RTEL1, DCLRE1B), and the p53-DREAM pathway represses 22 additional telomere-related genes. Interestingly, mutations in any DC-causal gene will cause telomere dysfunction and subsequent p53 activation to further promote the repression of p53-DREAM targets. Similarly, ribosomal dysfunction and DNA lesions cause p53 activation, and p53-DREAM targets include the DBA-causal gene TSR2, at least 9 FA-causal genes, and 38 other genes affecting ribosomes or the FA pathway. Furthermore, patients with BMFSs may exhibit brain abnormalities, and p53-DREAM represses 16 genes mutated in microcephaly or cerebellar hypoplasia. In sum, positive feedback loops and the repertoire of p53-DREAM targets likely contribute to partial phenotypic overlaps between BMFSs of distinct molecular origins.
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Affiliation(s)
- Jeanne Rakotopare
- Genetics of Tumor Suppression, Institut Curie, CEDEX 05, 75248 Paris, France;
- CNRS UMR3244, 75005 Paris, France
- Faculty of Science and Engineering, Sorbonne University, 75005 Paris, France
- Institut Curie, PSL Research University, 75005 Paris, France
| | - Franck Toledo
- Genetics of Tumor Suppression, Institut Curie, CEDEX 05, 75248 Paris, France;
- CNRS UMR3244, 75005 Paris, France
- Faculty of Science and Engineering, Sorbonne University, 75005 Paris, France
- Institut Curie, PSL Research University, 75005 Paris, France
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Lee BK, Xu P, Mageswaran UM, Jeong WS, Engku-Husna EI, Muhammad-Nashriq K, Todorov SD, Liu G, Park YH, Hadie SNH, Liong MT. Probiotic Improves Skin Oxidation, Elasticity, and Structural Properties in Aging Rats. Prev Nutr Food Sci 2023; 28:293-301. [PMID: 37842246 PMCID: PMC10567607 DOI: 10.3746/pnf.2023.28.3.293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 07/12/2023] [Accepted: 07/14/2023] [Indexed: 10/17/2023] Open
Abstract
Skin aging, which affects all living organisms, is associated with oxidative stress. Probiotics exhibit antioxidant properties by producing reactive metabolites that counter oxidative stress. We hypothesized that Limosilactobacillus fermentum USM 4189 (LF 4189) has antioxidative properties and may prevent skin aging. In the present study, we used a D-galactose senescence-induced rat model to evaluate the potential antioxidative capability of LF 4189. The results indicated that rats administered LF 4189 exhibited increased plasma antioxidative activity (P=0.004), lipid peroxidation capacity (P=0.007), and skin elasticity compared with untreated aged rats (P=0.005). LF 4189 prevented telomere length shortening (P<0.05), indicating the potential to prevent senescence. A higher apoptotic activity was observed in old rats compared with young rats, whereas LF 4189 reduced the expression of four antioxidative enzyme genes that function as radical scavengers (all P<0.05), suggesting that the LF 4189 group had a reduced need to scavenge free radicals. Our findings indicate the potential of probiotics, such as LF 4189, as an anti-aging dietary intervention with antioxidant potential to improve skin health.
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Affiliation(s)
- Boon-Kiat Lee
- Bioprocess Technology Division, School of Industrial Technology, Universiti Sains Malaysia, Penang 800, Malaysia
| | - Pei Xu
- Bioprocess Technology Division, School of Industrial Technology, Universiti Sains Malaysia, Penang 800, Malaysia
- Faculty of Cuisine, Sichuan Tourism University, Chengdu 610100, China
| | - Uma-Mageswary Mageswaran
- Bioprocess Technology Division, School of Industrial Technology, Universiti Sains Malaysia, Penang 800, Malaysia
| | - Woo-Sik Jeong
- Functional Food Chemistry Lab, School of Food Science and Biotechnology, Kyungpook National University, Daegu 7224, Korea
| | - Engku Ismail Engku-Husna
- Department of Obstetrics and Gynaecology, School of Medical Sciences, Universiti Sains Malaysia, Kelantan 1500, Malaysia
| | - Kadir Muhammad-Nashriq
- Department of Obstetrics and Gynaecology, School of Medical Sciences, Universiti Sains Malaysia, Kelantan 1500, Malaysia
| | - Svetoslav Dimitrov Todorov
- ProBacLab, Department of Food Science and Experimental Nutrition, Faculty of Pharmaceutical Sciences, University of Sao Paulo, Sao Paulo 008-000, Brazil
| | - Guoxia Liu
- CAS Key Laboratory of Microbial Physiological and Metabolic Engineering, State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 10084, China
- CAS-TWAS Centre of Excellence for Biotechnology, Beijing 100101, China
| | - Yong-Ha Park
- Jeonbuk Institute for Food-Bioindustry, Probionic Corporation, Jeonbuk 5410, Korea
| | - Siti Nurma Hanim Hadie
- Department of Anatomy, School of Medical Sciences, Universiti Sains Malaysia, Kelantan 15400, Malaysia
| | - Min-Tze Liong
- Bioprocess Technology Division, School of Industrial Technology, Universiti Sains Malaysia, Penang 800, Malaysia
- Renewable Biomass Transformation Cluster, School of Industrial Technology, Universiti Sains Malaysia, Penang 11800, Malaysia
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Maliński B, Vertemara J, Faustini E, Ladenvall C, Norberg A, Zhang Y, von Castelmur E, Baliakas P, Tisi R, Cammenga J, Lottersberger F. Novel pathological variants of NHP2 affect N-terminal domain flexibility, protein stability, H/ACA Ribonucleoprotein (RNP) complex formation and telomerase activity. Hum Mol Genet 2023; 32:2901-2912. [PMID: 37440454 PMCID: PMC10508036 DOI: 10.1093/hmg/ddad114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 07/06/2023] [Accepted: 07/07/2023] [Indexed: 07/15/2023] Open
Abstract
Telomere biology disorders (TBDs) are characterized by short telomeres, premature aging, bone marrow failure and cancer predisposition. Germline mutations in NHP2, encoding for one component of the telomerase cofactor H/ACA RNA binding complex together with Dyskerin, NOP10 and GAR1, have been previously reported in rare cases of TBDs. Here, we report two novel NHP2 variants (NHP2-A39T and NHP2-T44M) identified in a compound heterozygous patient affected by premature aging, bone marrow failure/myelodysplastic syndrome and gastric cancer. Although still able to support cell viability, both variants reduce the levels of hTR, the telomerase RNA component, and telomerase activity, expanding the panel of NHP2 pathological variants. Furthermore, both variants fail to be incorporated in the H/ACA RNA binding complex when in competition with wild-type endogenous NHP2, and the lack of incorporation causes their drastic proteasomal degradation. By RoseTTAFold prediction followed by molecular dynamics simulations, we reveal a dramatic distortion of residues 33-41, which normally position on top of the NHP2 core, as the main defect of NHP2-A39T, and high flexibility and the misplacement of the N-terminal region (residues 1-24) in NHP2-T44M and, to a lower degree, in NHP2-A39T. Because deletion of amino acids 2-24 causes a reduction in NHP2 levels only in the presence of wild-type NHP2, while deletion of amino acids 2-38 completely disrupts NHP2 stability, we propose that the two variants are mis-incorporated into the H/ACA binding complex due to the altered dynamics of the first 23 amino acids and/or the distortion of the residues 25-41 loop.
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Affiliation(s)
- Bartosz Maliński
- Department of Biomedical and Clinical Sciences, Faculty of Medicine and Health Sciences, Linköping University, Linköping 58185, Sweden
| | - Jacopo Vertemara
- Dipartimento di Biotecnologie e Bioscienze, Università di Milano-Bicocca, Milan 20126, Italy
| | - Elena Faustini
- Department of Biomedical and Clinical Sciences, Faculty of Medicine and Health Sciences, Linköping University, Linköping 58185, Sweden
| | - Claes Ladenvall
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala 90185, Sweden
| | - Anna Norberg
- Klinisk genetik, Norrlands Universitetssjukhus, Umeå 75185, Sweden
| | - Yuming Zhang
- Department of Biomedical and Clinical Sciences, Faculty of Medicine and Health Sciences, Linköping University, Linköping 58185, Sweden
| | - Eleonore von Castelmur
- Department of Physics, Chemistry and Biology, Linköping University, Linköping 58183, Sweden
| | - Panagiotis Baliakas
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala 90185, Sweden
| | - Renata Tisi
- Dipartimento di Biotecnologie e Bioscienze, Università di Milano-Bicocca, Milan 20126, Italy
| | - Jörg Cammenga
- Department of Biomedical and Clinical Sciences, Faculty of Medicine and Health Sciences, Linköping University, Linköping 58185, Sweden
- Department of Laboratory Medicine, Lund University, Lund 22184, Sweden
| | - Francisca Lottersberger
- Department of Biomedical and Clinical Sciences, Faculty of Medicine and Health Sciences, Linköping University, Linköping 58185, Sweden
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Kim JJ, Sayed ME, Ahn A, Slusher AL, Ying JY, Ludlow AT. Dynamics of TERT regulation via alternative splicing in stem cells and cancer cells. PLoS One 2023; 18:e0289327. [PMID: 37531400 PMCID: PMC10395990 DOI: 10.1371/journal.pone.0289327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 07/17/2023] [Indexed: 08/04/2023] Open
Abstract
Part of the regulation of telomerase activity includes the alternative splicing (AS) of the catalytic subunit telomerase reverse transcriptase (TERT). Although a therapeutic window for telomerase/TERT inhibition exists between cancer cells and somatic cells, stem cells express TERT and rely on telomerase activity for physiological replacement of cells. Therefore, identifying differences in TERT regulation between stem cells and cancer cells is essential for developing telomerase inhibition-based cancer therapies that reduce damage to stem cells. In this study, we measured TERT splice variant expression and telomerase activity in induced pluripotent stem cells (iPSCs), neural progenitor cells (NPCs), and non-small cell lung cancer cells (NSCLC, Calu-6 cells). We observed that a NOVA1-PTBP1-PTBP2 axis regulates TERT alternative splicing (AS) in iPSCs and their differentiation into NPCs. We also found that splice-switching of TERT, which regulates telomerase activity, is induced by different cell densities in stem cells but not cancer cells. Lastly, we identified cell type-specific splicing factors that regulate TERT AS. Overall, our findings represent an important step forward in understanding the regulation of TERT AS in stem cells and cancer cells.
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Affiliation(s)
- Jeongjin J Kim
- School of Kinesiology, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Mohammed E Sayed
- School of Kinesiology, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Alexander Ahn
- School of Kinesiology, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Aaron L Slusher
- School of Kinesiology, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Jeffrey Y Ying
- School of Kinesiology, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Andrew T Ludlow
- School of Kinesiology, University of Michigan, Ann Arbor, Michigan, United States of America
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Allaire P, He J, Mayer J, Moat L, Gerstenberger P, Wilhorn R, Strutz S, Kim DS, Zeng C, Cox N, Shay JW, Denny J, Bastarache L, Hebbring S. Genetic and clinical determinants of telomere length. HGG ADVANCES 2023; 4:100201. [PMID: 37216007 PMCID: PMC10199259 DOI: 10.1016/j.xhgg.2023.100201] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 04/21/2023] [Indexed: 05/24/2023] Open
Abstract
Many epidemiologic studies have identified important relationships between leukocyte telomere length (LTL) with genetics and health. Most of these studies have been significantly limited in scope by focusing predominantly on individual diseases or restricted to GWAS analysis. Using two large patient populations derived from Vanderbilt University and Marshfield Clinic biobanks linked to genomic and phenomic data from medical records, we investigated the inter-relationship between LTL, genomics, and human health. Our GWAS confirmed 11 genetic loci previously associated with LTL and two novel loci in SCNN1D and PITPNM1. PheWAS of LTL identified 67 distinct clinical phenotypes associated with both short and long LTL. We demonstrated that several diseases associated with LTL were related to one another but were largely independent from LTL genetics. Age of death was correlated with LTL independent of age. Those with very short LTL (<-1.5 standard deviation [SD]) died 10.4 years (p < 0.0001) younger than those with average LTL (±0.5 SD; mean age of death = 74.2 years). Likewise, those with very long LTL (>1.5 SD) died 1.9 years (p = 0.0175) younger than those with average LTL. This is consistent with the PheWAS results showing diseases associating with both short and long LTL. Finally, we estimated that the genome (12.8%) and age (8.5%) explain the largest proportion of LTL variance, whereas the phenome (1.5%) and sex (0.9%) explained a smaller fraction. In total, 23.7% of LTL variance was explained. These observations provide the rationale for expanded research to understand the multifaceted correlations between TL biology and human health over time, leading to effective LTL usage in medical applications.
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Affiliation(s)
- Patrick Allaire
- Marshfield Clinic Research Institute, Center for Precision Medicine Research, Marshfield, WI, USA
| | - Jing He
- Department of Biomedical Informatics, Vanderbilt University Medical Center, Nashville, TN, USA
| | - John Mayer
- Marshfield Clinic Research Institute, Office of Research Computing and Analytics, Marshfield, WI, USA
| | - Luke Moat
- Marshfield Clinic Research Institute, Center for Precision Medicine Research, Marshfield, WI, USA
| | - Peter Gerstenberger
- Marshfield Clinic Research Institute, Center for Precision Medicine Research, Marshfield, WI, USA
| | - Reynor Wilhorn
- Marshfield Clinic Research Institute, Center for Precision Medicine Research, Marshfield, WI, USA
| | - Sierra Strutz
- Marshfield Clinic Research Institute, Center for Precision Medicine Research, Marshfield, WI, USA
| | - David S.L. Kim
- Marshfield Clinic Health System, Pathology, Marshfield, WI, USA
| | - Chenjie Zeng
- National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA
| | - Nancy Cox
- Vanderbilt Genetics Institute, Division of Genetic Medicine, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Jerry W. Shay
- University of Texas Southwestern Medical Center, Department of Cell Biology and the Simmons Comprehensive Cancer Center, Dallas, TX, USA
| | - Joshua Denny
- National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA
| | - Lisa Bastarache
- Center for Precision Medicine, Department of Biomedical Informatics, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Scott Hebbring
- Marshfield Clinic Research Institute, Center for Precision Medicine Research, Marshfield, WI, USA
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9
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Choi YJ, Kim MS, Rhoades JH, Johnson NM, Berry CT, Root S, Chen Q, Tian Y, Fernandez RJ, Cramer Z, Adams-Tzivelekidis S, Li N, Johnson FB, Lengner CJ. Patient-Induced Pluripotent Stem Cell-Derived Hepatostellate Organoids Establish a Basis for Liver Pathologies in Telomeropathies. Cell Mol Gastroenterol Hepatol 2023; 16:451-472. [PMID: 37302654 PMCID: PMC10404563 DOI: 10.1016/j.jcmgh.2023.06.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 06/02/2023] [Accepted: 06/05/2023] [Indexed: 06/13/2023]
Abstract
BACKGROUND & AIMS Dyskeratosis congenita (DC) is a telomere biology disorder caused primarily by mutations in the DKC1 gene. Patients with DC and related telomeropathies resulting from premature telomere dysfunction experience multiorgan failure. In the liver, DC patients present with nodular hyperplasia, steatosis, inflammation, and cirrhosis. However, the mechanism responsible for telomere dysfunction-induced liver disease remains unclear. METHODS We used isogenic human induced pluripotent stem cells (iPSCs) harboring a causal DC mutation in DKC1 or a CRISPR/Cas9 (clustered regularly interspaced short palindromic repeats/Cas9)-corrected control allele to model DC liver pathologies. We differentiated these iPSCs into hepatocytes (HEPs) or hepatic stellate cells (HSCs) followed by generation of genotype-admixed hepatostellate organoids. Single-cell transcriptomics were applied to hepatostellate organoids to understand cell type-specific genotype-phenotype relationships. RESULTS Directed differentiation of iPSCs into HEPs and stellate cells and subsequent hepatostellate organoid formation revealed a dominant phenotype in the parenchyma, with DC HEPs becoming hyperplastic and also eliciting a pathogenic hyperplastic, proinflammatory response in stellate cells independent of stellate cell genotype. Pathogenic phenotypes in DKC1-mutant HEPs and hepatostellate organoids could be rescued via suppression of serine/threonine kinase AKT (protein kinase B) activity, a central regulator of MYC-driven hyperplasia downstream of DKC1 mutation. CONCLUSIONS Isogenic iPSC-derived admixed hepatostellate organoids offer insight into the liver pathologies in telomeropathies and provide a framework for evaluating emerging therapies.
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Affiliation(s)
- Young-Jun Choi
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Melissa S Kim
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Joshua H Rhoades
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Nicolette M Johnson
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Corbett T Berry
- Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Sarah Root
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Qijun Chen
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Yuhua Tian
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Rafael J Fernandez
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Zvi Cramer
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Stephanie Adams-Tzivelekidis
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Ning Li
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania; Institute for Regenerative Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - F Brad Johnson
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania; Institute for Regenerative Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.
| | - Christopher J Lengner
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania; Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania; Institute for Regenerative Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.
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10
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High-throughput telomere length measurement at nucleotide resolution using the PacBio high fidelity sequencing platform. Nat Commun 2023; 14:281. [PMID: 36650155 PMCID: PMC9845338 DOI: 10.1038/s41467-023-35823-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 12/20/2022] [Indexed: 01/19/2023] Open
Abstract
Telomeres are specialized nucleoprotein structures at the ends of linear chromosomes. The progressive shortening of steady-state telomere length in normal human somatic cells is a promising biomarker for age-associated diseases. However, there remain substantial challenges in quantifying telomere length due to the lack of high-throughput method with nucleotide resolution for individual telomere. Here, we describe a workflow to capture telomeres using newly designed telobaits in human culture cell lines as well as clinical patient samples and measure their length accurately at nucleotide resolution using single-molecule real-time (SMRT) sequencing. Our results also reveal the extreme heterogeneity of telomeric variant sequences (TVSs) that are dispersed throughout the telomere repeat region. The presence of TVSs disrupts the continuity of the canonical (5'-TTAGGG-3')n telomere repeats, which affects the binding of shelterin complexes at the chromosomal ends and telomere protection. These findings may have profound implications in human aging and diseases.
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11
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Exercise regulates shelterin genes and microRNAs implicated in ageing in Thoroughbred horses. Pflugers Arch 2022; 474:1159-1169. [PMID: 36085194 PMCID: PMC9560944 DOI: 10.1007/s00424-022-02745-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 08/10/2022] [Accepted: 08/29/2022] [Indexed: 11/03/2022]
Abstract
Ageing causes a gradual deterioration of bodily functions and telomere degradation. Excessive telomere shortening leads to cellular senescence and decreases tissue vitality. Six proteins, called shelterin, protect telomere integrity and control telomere length through telomerase-dependent mechanisms. Exercise training appears to maintain telomeres in certain somatic cells, although the underlying molecular mechanisms are incompletely understood. Here, we examined the influence of a single bout of vigorous exercise training on leukocyte telomerase reverse transcriptase (TERT) and shelterin gene expression, and the abundance of three microRNAs (miRNAs) implicated in biological ageing (miRNA-143, -223 and -486-5p) in an elite athlete and large animal model, Thoroughbred horses. Gene and miRNA expression were analysed using primer-based and TaqMan Assay qPCR. Leukocyte TRF1, TRF2 and POT1 expression were all significantly increased whilst miR-223 and miR-486-5p were decreased immediately after vigorous exercise (all p < 0.05), and tended to return to baseline levels 24 h after training. Relative to the young horses (~ 3.9 years old), middle-aged horses (~ 14.8 years old) exhibited reduced leukocyte TERT gene expression, and increased POT1 and miR-223 abundance (all p < 0.05). These data demonstrate that genes transcribing key components of the shelterin-telomere complex are influenced by ageing and dynamically regulated by a single bout of vigorous exercise in a large, athletic mammal - Thoroughbred horses. Our findings also implicate TERT and shelterin gene transcripts as potential targets of miR-223 and miR-486-5p, which are modulated by exercise and may have a role in the telomere maintenance and genomic stability associated with long-term aerobic training.
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12
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Structure of Tetrahymena telomerase-bound CST with polymerase α-primase. Nature 2022; 608:813-818. [PMID: 35831498 PMCID: PMC9728385 DOI: 10.1038/s41586-022-04931-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Accepted: 06/06/2022] [Indexed: 02/03/2023]
Abstract
Telomeres are the physical ends of linear chromosomes. They are composed of short repeating sequences (such as TTGGGG in the G-strand for Tetrahymena thermophila) of double-stranded DNA with a single-strand 3' overhang of the G-strand and, in humans, the six shelterin proteins: TPP1, POT1, TRF1, TRF2, RAP1 and TIN21,2. TPP1 and POT1 associate with the 3' overhang, with POT1 binding the G-strand3 and TPP1 (in complex with TIN24) recruiting telomerase via interaction with telomerase reverse transcriptase5 (TERT). The telomere DNA ends are replicated and maintained by telomerase6, for the G-strand, and subsequently DNA polymerase α-primase7,8 (PolαPrim), for the C-strand9. PolαPrim activity is stimulated by the heterotrimeric complex CTC1-STN1-TEN110-12 (CST), but the structural basis of the recruitment of PolαPrim and CST to telomere ends remains unknown. Here we report cryo-electron microscopy (cryo-EM) structures of Tetrahymena CST in the context of the telomerase holoenzyme, in both the absence and the presence of PolαPrim, and of PolαPrim alone. Tetrahymena Ctc1 binds telomerase subunit p50, a TPP1 orthologue, on a flexible Ctc1 binding motif revealed by cryo-EM and NMR spectroscopy. The PolαPrim polymerase subunit POLA1 binds Ctc1 and Stn1, and its interface with Ctc1 forms an entry port for G-strand DNA to the POLA1 active site. We thus provide a snapshot of four key components that are required for telomeric DNA synthesis in a single active complex-telomerase-core ribonucleoprotein, p50, CST and PolαPrim-that provides insights into the recruitment of CST and PolαPrim and the handoff between G-strand and C-strand synthesis.
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13
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Hoffman TW, van der Vis JJ, Biesma DH, Grutters JC, van Moorsel CHM. Extrapulmonary manifestations of a telomere syndrome in patients with idiopathic pulmonary fibrosis are associated with decreased survival. Respirology 2022; 27:959-965. [PMID: 35419815 DOI: 10.1111/resp.14264] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 03/11/2022] [Accepted: 04/04/2022] [Indexed: 12/28/2022]
Abstract
BACKGROUND AND OBJECTIVE Idiopathic pulmonary fibrosis (IPF) is a heterogenous disease with a median survival of 3-4 years. Patients with mutations in telomere-related genes exhibit extrapulmonary signs and symptoms. These patients represent a distinct phenotype of IPF with worse survival. As genetic analyses are not available for most patients with IPF, we sought to determine the predictive value of extrapulmonary signs and symptoms of a telomere syndrome in patients with IPF. METHODS We retrospectively studied 409 patients with IPF. Clinical characteristics, laboratory results and family history suggestive of a telomere syndrome were related to leukocyte telomere length measured by quantitative PCR and patient outcomes. RESULTS The cohort included 293 patients with sporadic IPF and 116 patients with a background of familial pulmonary fibrosis. Any or a combination of a clinical history (haematological disease, liver disease, early greying of hair, nail dystrophy, skin abnormalities), a family history or haematological laboratory abnormalities (macrocytosis, anaemia, thrombopenia or leukopenia) suggestive of a telomere syndrome was present in 27% of IPF patients and associated with shorter leukocyte telomere length and shorter survival (p = 0.002 in a multivariate model). In sporadic IPF, having either a clinical history, family history or haematological laboratory abnormalities was not significantly associated with decreased survival (p = 0.07 in a multivariate model). CONCLUSION Taking a careful clinical and family history focused on extrapulmonary manifestations of a telomere syndrome can provide important prognostic information in patients with IPF, as this is associated with shorter survival.
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Affiliation(s)
- Thijs W Hoffman
- ILD Center of Excellence, Department of Pulmonology, St. Antonius Hospital, Nieuwegein, The Netherlands
| | - Joanne J van der Vis
- ILD Center of Excellence, Department of Pulmonology, St. Antonius Hospital, Nieuwegein, The Netherlands.,Department of Clinical Chemistry, St. Antonius Hospital, Nieuwegein, The Netherlands
| | - Douwe H Biesma
- Department of Internal Medicine, St. Antonius Hospital, Nieuwegein, The Netherlands.,Department of Internal Medicine, University Medical Centre, Utrecht, The Netherlands
| | - Jan C Grutters
- ILD Center of Excellence, Department of Pulmonology, St. Antonius Hospital, Nieuwegein, The Netherlands.,Division of Heart and Lungs, University Medical Centre, Utrecht, The Netherlands
| | - Coline H M van Moorsel
- ILD Center of Excellence, Department of Pulmonology, St. Antonius Hospital, Nieuwegein, The Netherlands.,Division of Heart and Lungs, University Medical Centre, Utrecht, The Netherlands
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14
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Structure of active human telomerase with telomere shelterin protein TPP1. Nature 2022; 604:578-583. [PMID: 35418675 PMCID: PMC9912816 DOI: 10.1038/s41586-022-04582-8] [Citation(s) in RCA: 42] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 02/23/2022] [Indexed: 12/13/2022]
Abstract
Human telomerase is a RNA-protein complex that extends the 3' end of linear chromosomes by synthesizing multiple copies of the telomeric repeat TTAGGG1. Its activity is a determinant of cancer progression, stem cell renewal and cellular aging2-5. Telomerase is recruited to telomeres and activated for telomere repeat synthesis by the telomere shelterin protein TPP16,7. Human telomerase has a bilobal structure with a catalytic core ribonuclear protein and a H and ACA box ribonuclear protein8,9. Here we report cryo-electron microscopy structures of human telomerase catalytic core of telomerase reverse transcriptase (TERT) and telomerase RNA (TER (also known as hTR)), and of telomerase with the shelterin protein TPP1. TPP1 forms a structured interface with the TERT-unique telomerase essential N-terminal domain (TEN) and the telomerase RAP motif (TRAP) that are unique to TERT, and conformational dynamics of TEN-TRAP are damped upon TPP1 binding, defining the requirements for recruitment and activation. The structures further reveal that the elements of TERT and TER that are involved in template and telomeric DNA handling-including the TEN domain and the TRAP-thumb helix channel-are largely structurally homologous to those in Tetrahymena telomerase10, and provide unique insights into the mechanism of telomerase activity. The binding site of the telomerase inhibitor BIBR153211,12 overlaps a critical interaction between the TER pseudoknot and the TERT thumb domain. Numerous mutations leading to telomeropathies13,14 are located at the TERT-TER and TEN-TRAP-TPP1 interfaces, highlighting the importance of TER-TERT and TPP1 interactions for telomerase activity, recruitment and as drug targets.
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15
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Telomere dysfunction in ageing and age-related diseases. Nat Cell Biol 2022; 24:135-147. [DOI: 10.1038/s41556-022-00842-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Accepted: 01/06/2022] [Indexed: 12/11/2022]
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16
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Gueiderikh A, Maczkowiak-Chartois F, Rosselli F. A new frontier in Fanconi anemia: From DNA repair to ribosome biogenesis. Blood Rev 2021; 52:100904. [PMID: 34750031 DOI: 10.1016/j.blre.2021.100904] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 10/14/2021] [Accepted: 10/26/2021] [Indexed: 12/27/2022]
Abstract
Described by Guido Fanconi almost 100 years ago, Fanconi anemia (FA) is a rare genetic disease characterized by developmental abnormalities, bone marrow failure (BMF) and cancer predisposition. The proteins encoded by FA-mutated genes (FANC proteins) and assembled in the so-called FANC/BRCA pathway have key functions in DNA repair and replication safeguarding, which loss leads to chromosome structural aberrancies. Therefore, since the 1980s, FA has been considered a genomic instability and chromosome fragility syndrome. However, recent findings have demonstrated new and unexpected roles of FANC proteins in nucleolar homeostasis and ribosome biogenesis, the alteration of which impacts cellular proteostasis. Here, we review the different cellular, biochemical and molecular anomalies associated with the loss of function of FANC proteins and discuss how these anomalies contribute to BMF by comparing FA to other major inherited BMF syndromes. Our aim is to determine the extent to which alterations in the DNA damage response in FA contribute to BMF compared to the consequences of the loss of function of the FANC/BRCA pathway on the other roles of the pathway.
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Affiliation(s)
- Anna Gueiderikh
- CNRS - UMR9019, Équipe labellisée "La Ligue contre le Cancer", 94805 Villejuif, France; Gustave Roussy Cancer Center, 94805 Villejuif, France; Université Paris-Saclay - Paris Sud, Orsay, France.
| | - Frédérique Maczkowiak-Chartois
- CNRS - UMR9019, Équipe labellisée "La Ligue contre le Cancer", 94805 Villejuif, France; Gustave Roussy Cancer Center, 94805 Villejuif, France; Université Paris-Saclay - Paris Sud, Orsay, France.
| | - Filippo Rosselli
- CNRS - UMR9019, Équipe labellisée "La Ligue contre le Cancer", 94805 Villejuif, France; Gustave Roussy Cancer Center, 94805 Villejuif, France; Université Paris-Saclay - Paris Sud, Orsay, France.
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17
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Tsai YY, Su CH, Tarn WY. p53 Activation in Genetic Disorders: Different Routes to the Same Destination. Int J Mol Sci 2021; 22:9307. [PMID: 34502215 PMCID: PMC8430931 DOI: 10.3390/ijms22179307] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 08/23/2021] [Accepted: 08/25/2021] [Indexed: 12/18/2022] Open
Abstract
The tumor suppressor p53 is critical for preventing neoplastic transformation and tumor progression. Inappropriate activation of p53, however, has been observed in a number of human inherited disorders that most often affect development of the brain, craniofacial region, limb skeleton, and hematopoietic system. Genes related to these developmental disorders are essentially involved in transcriptional regulation/chromatin remodeling, rRNA metabolism, DNA damage-repair pathways, telomere maintenance, and centrosome biogenesis. Perturbation of these activities or cellular processes may result in p53 accumulation in cell cultures, animal models, and perhaps humans as well. Mouse models of several p53 activation-associated disorders essentially recapitulate human traits, and inactivation of p53 in these models can alleviate disorder-related phenotypes. In the present review, we focus on how dysfunction of the aforementioned biological processes causes developmental defects via excessive p53 activation. Notably, several disease-related genes exert a pleiotropic effect on those cellular processes, which may modulate the magnitude of p53 activation and establish or disrupt regulatory loops. Finally, we discuss potential therapeutic strategies for genetic disorders associated with p53 misactivation.
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18
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Dong X, Sun S, Zhang L, Kim S, Tu Z, Montagna C, Maslov AY, Suh Y, Wang T, Campisi J, Vijg J. Age-related telomere attrition causes aberrant gene expression in sub-telomeric regions. Aging Cell 2021; 20:e13357. [PMID: 34018656 PMCID: PMC8208793 DOI: 10.1111/acel.13357] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 03/01/2021] [Accepted: 03/07/2021] [Indexed: 12/13/2022] Open
Abstract
Telomere attrition has been proposed as a biomarker and causal factor in aging. In addition to causing cellular senescence and apoptosis, telomere shortening has been found to affect gene expression in subtelomeric regions. Here, we analyzed the distribution of age-related differentially expressed genes from the GTEx RNA sequencing database of 54 tissue types from 979 human subjects and found significantly more upregulated than downregulated genes in subtelomeric regions as compared to the genome-wide average. Our data demonstrate spatial relationships between telomeres and gene expression in aging.
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Affiliation(s)
- Xiao Dong
- Department of GeneticsAlbert Einstein College of MedicineBronxNYUSA
- Institute on the Biology of Aging and MetabolismDepartment of Genetics, Cell Biology and DevelopmentUniversity of MinnesotaMinneapolisMNUSA
| | - Shixiang Sun
- Department of GeneticsAlbert Einstein College of MedicineBronxNYUSA
| | - Lei Zhang
- Department of GeneticsAlbert Einstein College of MedicineBronxNYUSA
- Institute on the Biology of Aging and MetabolismDepartment of Genetics, Cell Biology and DevelopmentUniversity of MinnesotaMinneapolisMNUSA
| | - Seungsoo Kim
- Department of Obstetrics and GynecologyColumbia University Irving Medical CenterNew YorkNYUSA
| | - Zhidong Tu
- Department of Genetics and Genomic SciencesIcahn Institute for Genomics and Multiscale BiologyIcahn School of Medicine Mount SinaiNew YorkNYUSA
| | | | - Alexander Y. Maslov
- Department of GeneticsAlbert Einstein College of MedicineBronxNYUSA
- Laboratory of Applied Genomic TechnologiesVoronezh State University of Engineering TechnologyVoronezhRussia
| | - Yousin Suh
- Department of Obstetrics and GynecologyColumbia University Irving Medical CenterNew YorkNYUSA
- Department of Genetics and DevelopmentColumbia University Irving Medical CenterNew YorkNYUSA
| | - Tao Wang
- Department of Epidemiology & Population HealthAlbert Einstein College of MedicineBronxNYUSA
| | | | - Jan Vijg
- Department of GeneticsAlbert Einstein College of MedicineBronxNYUSA
- School of Public HealthCenter for Single‐Cell OmicsShanghai Jiao Tong University School of MedicineShanghaiChina
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19
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Sadhukhan R, Ghosh U. PARP1 modulates telomere sister chromatid exchange and telomere length homeostasis by regulating telomere localization of SLX4 in U2OS cells. Life Sci 2021; 277:119556. [PMID: 33945829 DOI: 10.1016/j.lfs.2021.119556] [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: 01/23/2021] [Revised: 04/12/2021] [Accepted: 04/20/2021] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Poly(ADP-ribose) polymerase1 (PARP1) interacts and poly(ADP-ribosyl)ates telomere repeat binding factor 2 (TRF2), which acts as a platform to recruit a large number of proteins at the telomere. Since the discovery of TRF2-SLX4 interaction, SLX4 is becoming the key player in telomere length (TL) maintenance and repair by telomere sister chromatid exchange (T-SCE). Defective TL maintenance pathway results in a spectrum of diseases called telomeropathies like dyskeratosis congenita, aplastic anemia, fanconi anemia, cancer. We aimed to study the role of SLX4 and PARP1 on each other's telomere localization, T-SCE, and TL maintenance in human telomerase-negative osteosarcoma U2OS cells to understand some of the molecular mechanisms of telomere homeostasis. MATERIALS AND METHODS We checked the role of SLX4 and PARP1 on each other's telomere localization by telomere immunofluorescence. We have cloned full-length wild-type and catalytically inactive mutant PARP1 to understand the role of poly(ADP-ribosyl)ation reaction by PARP1 in telomere length homeostasis. TL of U2OS cells was measured by Q-FISH. T-SCE was measured by Telomere-FISH. KEY FINDINGS We observed that SLX4 has no role in the telomere localization of PARP1. However, reduced localization of SLX4 at undamaged and damaged telomere upon PARP1 depletion was reversed by overexpression of exogenous wild-type PARP1 but not by overexpression of catalytically inactive mutant PARP1. PARP1 depletion synergized SLX4 depletion-mediated reduction of T-SCE. Furthermore, SLX4 depletion elongated TL, and combined insufficiency of SLX4 with PARP1 further elongated TL. CONCLUSION So, PARP1 controls SLX4 recruitment at telomere by poly(ADP-ribosyl)ation reaction, thereby regulating SLX4-mediated T-SCE and TL homeostasis.
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Affiliation(s)
- Ratan Sadhukhan
- Department of Biochemistry & Biophysics, University of Kalyani, Kalyani 741235, India
| | - Utpal Ghosh
- Department of Biochemistry & Biophysics, University of Kalyani, Kalyani 741235, India.
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20
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Subasri M, Shooshtari P, Watson AJ, Betts DH. Analysis of TERT Isoforms across TCGA, GTEx and CCLE Datasets. Cancers (Basel) 2021; 13:cancers13081853. [PMID: 33924498 PMCID: PMC8070023 DOI: 10.3390/cancers13081853] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 04/01/2021] [Accepted: 04/08/2021] [Indexed: 12/14/2022] Open
Abstract
Reactivation of the multi-subunit ribonucleoprotein telomerase is the primary telomere maintenance mechanism in cancer, but it is rate-limited by the enzymatic component, telomerase reverse transcriptase (TERT). While regulatory in nature, TERT alternative splice variant/isoform regulation and functions are not fully elucidated and are further complicated by their highly diverse expression and nature. Our primary objective was to characterize TERT isoform expression across 7887 neoplastic and 2099 normal tissue samples using The Cancer Genome Atlas (TCGA) and the Genotype-Tissue Expression Project (GTEx), respectively. We confirmed the global overexpression and splicing shift towards full-length TERT in neoplastic tissue. Stratifying by tissue type we found uncharacteristic TERT expression in normal brain tissue subtypes. Stratifying by tumor-specific subtypes, we detailed TERT expression differences potentially regulated by subtype-specific molecular characteristics. Focusing on β-deletion splicing regulation, we found the NOVA1 trans-acting factor to mediate alternative splicing in a cancer-dependent manner. Of relevance to future tissue-specific studies, we clustered cancer cell lines with tumors from related origin based on TERT isoform expression patterns. Taken together, our work has reinforced the need for tissue and tumour-specific TERT investigations, provided avenues to do so, and brought to light the current technical limitations of bioinformatic analyses of TERT isoform expression.
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Affiliation(s)
- Mathushan Subasri
- Department of Physiology and Pharmacology, The University of Western Ontario, London, ON N6A 5C1, Canada; (M.S.); (A.J.W.)
| | - Parisa Shooshtari
- Ontario Institute for Cancer Research, Toronto, ON M5G 0A3, Canada;
- Department of Pathology and Laboratory Medicine, The University of Western Ontario, London, ON N6A 5C1, Canada
- Department of Computer Science, The University of Western Ontario, London, ON N6A 5C1, Canada
- The Children’s Health Research Institute—Lawson Health Research Institute, London, ON N6C 2R5, Canada
| | - Andrew J. Watson
- Department of Physiology and Pharmacology, The University of Western Ontario, London, ON N6A 5C1, Canada; (M.S.); (A.J.W.)
- The Children’s Health Research Institute—Lawson Health Research Institute, London, ON N6C 2R5, Canada
- Department of Obstetrics and Gynaecology, The University of Western Ontario, London, ON N6A 5C1, Canada
| | - Dean H. Betts
- Department of Physiology and Pharmacology, The University of Western Ontario, London, ON N6A 5C1, Canada; (M.S.); (A.J.W.)
- The Children’s Health Research Institute—Lawson Health Research Institute, London, ON N6C 2R5, Canada
- Department of Obstetrics and Gynaecology, The University of Western Ontario, London, ON N6A 5C1, Canada
- Correspondence: ; Tel.: +1-519-661-2111 (ext. 83786)
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21
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Afshar H, Abedini A, Nadji SA, Sadr M, Kiani A, Alizadeh N, Javadi A. Telomere length assessment in blood leukocytes of patients with sarcoidosis. SARCOIDOSIS, VASCULITIS, AND DIFFUSE LUNG DISEASES : OFFICIAL JOURNAL OF WASOG 2021; 38:e2021009. [PMID: 33867793 PMCID: PMC8050626 DOI: 10.36141/svdld.v38i1.10705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/27/2020] [Accepted: 02/07/2020] [Indexed: 11/03/2022]
Abstract
BACKGROUND Accelerated aging and telomere shortening have been studied in many chronic diseases such as interstitial pulmonary fibrosis and chronic obstructive pulmonary disease. Different studies have shown that patients with these diseases have shorter telomere lengths than controls; this can be a marker of the progression and outcome of the disease. So far, a few studies have been evaluated the telomere length in sarcoidosis. In this study we determine the telomere length in patients with sarcoidosis and compare it with control subjects. OBJECTIVE Our aim is to compare telomere length in patients with sarcoidosis and normal population. Methods: We select 58 patients with sarcoidosis who were visited in the sarcoidosis clinic of Masih Daneshvari Hospital. 58 sex and age-matched (with±2 years) healthy control subjects were selected. Telomere length was measured by quantitative real time PCR as described by Cawthon on peripheral blood sample. The telomere repeat copy number (T) to single-gene copy number(S) ratio was calculated using the comparative Ct method. Results: The mean and standard deviation of telomere length in the patient and control group was 0.65 ± 0.05 and 0.72 ± 0.07 respectively. There was a statistically significant difference between the two groups. (P = 0.031). Conclusion: Sarcoidosis is an inflammatory disease that can involve many organs. Like other chronic diseases, aging phenomenon occurs in that; which led to decrease cellular and tissue telomere length. This article demonstrates shorter telomere length in Iranian sarcoidosis patients compared to normal population.
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Affiliation(s)
- Hale Afshar
- Department of Pulmonary Medicine, Hazrate Rasoole Akram Hospital , Iran University of Medical Sciences, Tehran, Iran
| | - Atefeh Abedini
- Chronic Respiratory Diseases Research Center, National Research Institute of Tuberculosis and Lung Disease (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Seyed Alireza Nadji
- Virology Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Makan Sadr
- Virology Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Arda Kiani
- Tracheal Diseases Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Niloufar Alizadeh
- Chronic Respiratory Diseases Research Center, National Research Institute of Tuberculosis and Lung Disease (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Alireza Javadi
- Virology Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
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22
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Crisà E, Boggione P, Nicolosi M, Mahmoud AM, Al Essa W, Awikeh B, Aspesi A, Andorno A, Boldorini R, Dianzani I, Gaidano G, Patriarca A. Genetic Predisposition to Myelodysplastic Syndromes: A Challenge for Adult Hematologists. Int J Mol Sci 2021; 22:ijms22052525. [PMID: 33802366 PMCID: PMC7959319 DOI: 10.3390/ijms22052525] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 02/23/2021] [Accepted: 02/25/2021] [Indexed: 12/17/2022] Open
Abstract
Myelodysplastic syndromes (MDS) arising in the context of inherited bone marrow failure syndromes (IBMFS) differ in terms of prognosis and treatment strategy compared to MDS occurring in the adult population without an inherited genetic predisposition. The main molecular pathways affected in IBMFS involve telomere maintenance, DNA repair, biogenesis of ribosomes, control of proliferation and others. The increased knowledge on the genes involved in MDS pathogenesis and the wider availability of molecular diagnostic assessment have led to an improvement in the detection of IBMFS genetic predisposition in MDS patients. A punctual recognition of these disorders implies a strict surveillance of the patient in order to detect early signs of progression and promptly offer allogeneic hematopoietic stem cell transplantation, which is the only curative treatment. Moreover, identifying an inherited mutation allows the screening and counseling of family members and directs the choice of donors in case of need for transplantation. Here we provide an overview of the most recent data on MDS with genetic predisposition highlighting the main steps of the diagnostic and therapeutic management. In order to highlight the pitfalls of detecting IBMFS in adults, we report the case of a 27-year-old man affected by MDS with an underlying telomeropathy.
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Affiliation(s)
- Elena Crisà
- Division of Hematology, Department of Translational Medicine, University of Eastern Piedmont and Azienda Ospedaliero-Universitaria Maggiore della Carità, 28100 Novara, Italy; (P.B.); (M.N.); (A.M.M.); (W.A.E.); (B.A.); (A.P.)
- Correspondence: (E.C.); (G.G.); Tel.: +39-0321-660-655 (E.C. & G.G.); Fax: +39-0321-373-3095 (E.C.)
| | - Paola Boggione
- Division of Hematology, Department of Translational Medicine, University of Eastern Piedmont and Azienda Ospedaliero-Universitaria Maggiore della Carità, 28100 Novara, Italy; (P.B.); (M.N.); (A.M.M.); (W.A.E.); (B.A.); (A.P.)
| | - Maura Nicolosi
- Division of Hematology, Department of Translational Medicine, University of Eastern Piedmont and Azienda Ospedaliero-Universitaria Maggiore della Carità, 28100 Novara, Italy; (P.B.); (M.N.); (A.M.M.); (W.A.E.); (B.A.); (A.P.)
| | - Abdurraouf Mokhtar Mahmoud
- Division of Hematology, Department of Translational Medicine, University of Eastern Piedmont and Azienda Ospedaliero-Universitaria Maggiore della Carità, 28100 Novara, Italy; (P.B.); (M.N.); (A.M.M.); (W.A.E.); (B.A.); (A.P.)
| | - Wael Al Essa
- Division of Hematology, Department of Translational Medicine, University of Eastern Piedmont and Azienda Ospedaliero-Universitaria Maggiore della Carità, 28100 Novara, Italy; (P.B.); (M.N.); (A.M.M.); (W.A.E.); (B.A.); (A.P.)
| | - Bassel Awikeh
- Division of Hematology, Department of Translational Medicine, University of Eastern Piedmont and Azienda Ospedaliero-Universitaria Maggiore della Carità, 28100 Novara, Italy; (P.B.); (M.N.); (A.M.M.); (W.A.E.); (B.A.); (A.P.)
| | - Anna Aspesi
- Laboratory of Genetic Pathology, Division of Pathology, Department of Health Sciences, University of Eastern Piedmont and Azienda Ospedaliero-Universitaria Maggiore della Carità, 28100 Novara, Italy; (A.A.); (I.D.)
| | - Annalisa Andorno
- Division of Pathology, Department of Health Sciences, University of Eastern Piedmont and Azienda Ospedaliero-Universitaria Maggiore della Carità, 28100 Novara, Italy; (A.A.); (R.B.)
| | - Renzo Boldorini
- Division of Pathology, Department of Health Sciences, University of Eastern Piedmont and Azienda Ospedaliero-Universitaria Maggiore della Carità, 28100 Novara, Italy; (A.A.); (R.B.)
| | - Irma Dianzani
- Laboratory of Genetic Pathology, Division of Pathology, Department of Health Sciences, University of Eastern Piedmont and Azienda Ospedaliero-Universitaria Maggiore della Carità, 28100 Novara, Italy; (A.A.); (I.D.)
| | - Gianluca Gaidano
- Division of Hematology, Department of Translational Medicine, University of Eastern Piedmont and Azienda Ospedaliero-Universitaria Maggiore della Carità, 28100 Novara, Italy; (P.B.); (M.N.); (A.M.M.); (W.A.E.); (B.A.); (A.P.)
- Correspondence: (E.C.); (G.G.); Tel.: +39-0321-660-655 (E.C. & G.G.); Fax: +39-0321-373-3095 (E.C.)
| | - Andrea Patriarca
- Division of Hematology, Department of Translational Medicine, University of Eastern Piedmont and Azienda Ospedaliero-Universitaria Maggiore della Carità, 28100 Novara, Italy; (P.B.); (M.N.); (A.M.M.); (W.A.E.); (B.A.); (A.P.)
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Refaey MS, Abdelhamid RA, Elimam H, Elshaier YAMM, Ali AA, Orabi MAA. Bioactive constituents from Thunbergia erecta as potential anticholinesterase and anti-ageing agents: Experimental and in silico studies. Bioorg Chem 2021; 108:104643. [PMID: 33486370 DOI: 10.1016/j.bioorg.2021.104643] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 12/13/2020] [Accepted: 01/05/2021] [Indexed: 12/13/2022]
Abstract
Acetylcholinesterase (AChE) inhibitor and telomerase reverse transcriptase (TERT) potentiator phytochemicals are highly targeted as anti-Alzheimerꞌs disease and as an anti-ageing process. A phytochemical study of Thunbergia erecta aerial parts resulted in the isolation of ten compounds (1-10). Their structures were identified based on spectral data and comparison with literature values. The activity of our pure isolates on AChE and TERT enzymes by documented in vitro assay methods were evaluated. The results indicated that apigenin (2), vanillic acid (4), and acacetin-7-O-β-D-glucoside (7) exhibited potent inhibition of AChE (IC50 37.33, 30.80 and 49.57 ng/mL, respectively), compared to the standard drug donepezil (IC50 31.25 ng/mL). In the TERT enzyme assay, compound 7 triggered a 1.66‑fold increase in telomerase activity at the concentration of 2.85 ng/ml. This is the first study that demonstrates that compound 7 isolated from T. erecta can lead to such telomerase activity relative to control cells. Virtual screening studies including docking, rapid overlay chemical structure (ROCS), and calculated structure-property relationships (SPR) were implemented in this work. Molecular docking studies supported the binding of compounds 2, 4, and 7 through hydrogen bonds (HBs) formation to essential amino acid residues namely ARG:24 A, SER:347 A, LYS:51 A, PHE:346 A, and GLY:345 A of acetylcholinesterase. ROCS and SPR analyses realized compound 2 as a possible treatment of Alzheimer's disease and as a lead compound for drug development process through applying semisynthetic modifications.
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Affiliation(s)
- Mohamed S Refaey
- Department of Pharmacognosy, Faculty of Pharmacy, University of Sadat City, Sadat City, Menoufiya 32958, Egypt
| | - Reda A Abdelhamid
- Department of Pharmacognosy, Faculty of Pharmacy, Al-Azhar University, Assiut Branch, Assiut 71524, Egypt
| | - Hanan Elimam
- Department of Biochemistry, Faculty of Pharmacy, University of Sadat City, Sadat City 32958, Egypt; Department of Medicine, McGill University Health Centre, National Research Institute, McGill University, Montreal, Quebec, Canada
| | - Yaseen A M M Elshaier
- Department of Organic and Medicinal chemistry, Faculty of Pharmacy, University of Sadat City, Sadat City, Menoufiya 32958, Egypt
| | - A A Ali
- Department of Pharmacognosy, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt
| | - Mohamed A A Orabi
- Department of Pharmacognosy, Faculty of Pharmacy, Al-Azhar University, Assiut Branch, Assiut 71524, Egypt.
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24
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Ibáñez-Cabellos JS, Seco-Cervera M, Picher-Latorre C, Pérez-Machado G, García-Giménez JL, Pallardó FV. Acute depletion of telomerase components DKC1 and NOP10 induces oxidative stress and disrupts ribosomal biogenesis via NPM1 and activation of the P53 pathway. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2020; 1867:118845. [DOI: 10.1016/j.bbamcr.2020.118845] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 08/28/2020] [Accepted: 09/02/2020] [Indexed: 02/07/2023]
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25
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Garrido-Navas MC, Tippins F, Barwell J, Hoffman J, Codd V, Royle NJ. Telomere Instability in Lynch Syndrome Families Leads to Some Shorter Telomeres in MSH2+/- Carriers. Life (Basel) 2020; 10:life10110265. [PMID: 33142697 PMCID: PMC7692680 DOI: 10.3390/life10110265] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Revised: 10/27/2020] [Accepted: 10/29/2020] [Indexed: 12/17/2022] Open
Abstract
Lynch syndrome (LS) is an inherited predisposition to early onset of various cancers, caused by mutation in a DNA mismatch repair (MMR) gene. In heterozygous MMR+/− carriers, somatic mutation, loss or silencing of the wild type allele increases the mutation rate, facilitating the initiation of MMR-defective cancers. These cancers are characterized by instability at short tandem repeats (STRs) and in telomeric DNA. We have investigated telomere length in saliva DNA from LS and control families, using single telomere analysis at XpYp and 12q and by qPCR to measure total telomeric DNA. Single telomere analysis showed a trend for shorter XpYp telomeres in MSH2+/− carriers compared to MLH1+/− carriers or controls, but this was masked in the comparative analysis of total telomeric DNA. Comparison of age-adjusted telomere length within families showed that neither MSH2+/− or MLH1+/− children had consistently shorter or longer telomeres than their MMR+/− parent, indicating the absence of an inter-generational effect on telomere length. Unexpectedly however, wildtype children in families with MSH2 mutations, had significantly longer XpYp telomeres than their MMR+/− parent. Altogether our data suggest that MMR insufficiency, particularly in MSH2+/− carriers, increases telomere instability and somatic cell turnover during the lifetime of LS mutation carriers but has minimal consequences for telomere length in the germline.
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Affiliation(s)
- M. Carmen Garrido-Navas
- Department of Genetics and Genome Biology, University of Leicester, Leicester LE1 7RH, UK; (F.T.); (J.B.)
- Liquid Biopsies & Cancer Interception (LiqBiopCI) Group, Junta de Andalucía de Genómica Investigación Oncológica, GENYO–Centro Pfizer–Universidad de Granada, 18016 Granada, Spain
- Universidad Internacional de la Rioja, 137, 26006 Logroño, La Rioja, Spain
- Correspondence: (M.C.G.-N.); (N.J.R.)
| | - Frances Tippins
- Department of Genetics and Genome Biology, University of Leicester, Leicester LE1 7RH, UK; (F.T.); (J.B.)
| | - Julian Barwell
- Department of Genetics and Genome Biology, University of Leicester, Leicester LE1 7RH, UK; (F.T.); (J.B.)
| | - Jonathan Hoffman
- Clinical Genetics Unit, Birmingham Women’s Hospital, Birmingham B15 2TG, UK;
| | - Veryan Codd
- Department of Cardiovascular Sciences, University of Leicester, BHF Cardiovascular Research Centre, Glenfield Hospital, Leicester LE3 9QP, UK;
| | - Nicola J. Royle
- Department of Genetics and Genome Biology, University of Leicester, Leicester LE1 7RH, UK; (F.T.); (J.B.)
- Correspondence: (M.C.G.-N.); (N.J.R.)
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26
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Yildirim H, Yildiz P, Coskunpinar E. Investigation of telomere related gene mutations in idiopathic pulmonary fibrosis. Mol Biol Rep 2020; 47:7851-7860. [PMID: 33006015 DOI: 10.1007/s11033-020-05861-1] [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: 07/21/2020] [Accepted: 09/24/2020] [Indexed: 11/28/2022]
Abstract
Idiopathic Pulmonary Fibrosis (IPF) is the most common type of Idiopathic Interstitial Pneumonias (IIP). The aim of this study is to determine the mutation of variants in four telomere-related genes and to determine the possible relationship between these mutations and telomere shortening in order to contribute to the understanding of the pathophysiology of IPF. For this study, 34 individuals with IPF, 32 individuals with non-IPF ILD (Interstitial Lung Disease), and 31 healthy controls between the ages of 40 and 85 were included. The mutation analysis and telomere measurements were examined for the volunteers. According to the mutation screening results, no significant difference was found between the patients with IPF, non-IPF ILD groups and healthy individuals in terms of genotyping analysis. However, in terms of the allele distribution for two genes, statistically significant difference was found in IPF and non-IPF ILD patients (TERT; p = 0.002 and TERC; p = 0.001). According to the telomere length measurement, the telomeres of the patients were shorter than of the control group (p = 0.0001). In compliance with the results of our analysis, it is thought that genes that have allelic significance from the point of gene mutations as well as telomere shortening may be risk factors for the disease.
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Affiliation(s)
- Halime Yildirim
- School of Medicine, Department of Medical Biology, University of Health Sciences Turkey, Istanbul, Turkey
| | - Pinar Yildiz
- Chest Diseases, Yedikule Chest Diseases and Thoracic Surgery Training and Research Hospital, University of Health Sciences, Istanbul, Turkey
| | - Ender Coskunpinar
- School of Medicine, Department of Medical Biology, University of Health Sciences Turkey, Istanbul, Turkey.
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27
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Nudelman KNH, Lin J, Lane KA, Nho K, Kim S, Faber KM, Risacher SL, Foroud TM, Gao S, Davis JW, Weiner MW, Saykin AJ. Telomere Shortening in the Alzheimer's Disease Neuroimaging Initiative Cohort. J Alzheimers Dis 2020; 71:33-43. [PMID: 31322561 DOI: 10.3233/jad-190010] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
BACKGROUND Although shorter telomeres have been associated with Alzheimer's disease (AD), it is unclear whether longitudinal change in telomere length is associated with AD progression. OBJECTIVE To investigate the association of telomere length change with AD diagnosis and progression. METHODS In 653 individuals from the Alzheimer's Disease Neuroimaging Initiative (ADNI) cohort, T/S ratio (telomere versus single copy gene), a proxy of telomere length, was measured for up to five visits per participant (N = 1918 samples post-QC) using quantitative PCR (qPCR). T/S ratio was adjusted for batch effects and DNA storage time. A mixed effects model was used to evaluate association of telomere length with AD diagnostic group and interaction of age and diagnosis. Another mixed effects model was used to compare T/S ratio changes pre- to post-conversion to MCI or AD to telomere change in participants with stable diagnoses. RESULTS Shorter telomeres were associated with older age (Effect Size (ES) = -0.23) and male sex (ES = -0.26). Neither baseline T/S ratio (ES = -0.036) nor T/S ratio change (ES = 0.046) differed significantly between AD diagnostic groups. MCI/AD converters showed greater, but non-significant, telomere shortening compared to non-converters (ES = -0.186). CONCLUSIONS Although AD compared to controls showed small, non-significant effects for baseline T/S ratio and T/S ratio shortening, we did observe a larger, though still non-significant effect for greater telomere shortening in converters compared to non-converters. Although our results do not support telomere shortening as a robust biomarker of AD progression, further investigation in larger samples and for subgroups of participants may be informative.
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Affiliation(s)
- Kelly N H Nudelman
- Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN, USA.,National Centralized Repository for Alzheimer's Disease and Related Dementias (NCRAD), Indiana University School of Medicine, Indianapolis, IN, USA.,Indiana Alzheimer Disease Center, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Jue Lin
- Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, CA, USA
| | - Kathleen A Lane
- Biostatistics, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Kwangsik Nho
- Indiana Alzheimer Disease Center, Indiana University School of Medicine, Indianapolis, IN, USA.,Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Sungeun Kim
- Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, IN, USA.,Electrical and Computer Engineering, SUNY Oswego, Oswego, NY, USA
| | - Kelley M Faber
- Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN, USA.,National Centralized Repository for Alzheimer's Disease and Related Dementias (NCRAD), Indiana University School of Medicine, Indianapolis, IN, USA
| | - Shannon L Risacher
- Indiana Alzheimer Disease Center, Indiana University School of Medicine, Indianapolis, IN, USA.,Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Tatiana M Foroud
- Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN, USA.,National Centralized Repository for Alzheimer's Disease and Related Dementias (NCRAD), Indiana University School of Medicine, Indianapolis, IN, USA.,Indiana Alzheimer Disease Center, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Sujuan Gao
- Biostatistics, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Justin W Davis
- Genomics Research Center, AbbVie, North Chicago, IL, USA
| | - Michael W Weiner
- Center for Imaging of Neurodegenerative Diseases, Department of Radiology, San Francisco VA Medical Center/University of California San Francisco, San Francisco, CA, USA
| | - Andrew J Saykin
- Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN, USA.,Indiana Alzheimer Disease Center, Indiana University School of Medicine, Indianapolis, IN, USA.,Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, IN, USA
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28
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Truta B, Wohler E, Sobreira N, Datta LW, Brant SR. Role of telomere shortening in anticipation of inflammatory bowel disease. World J Gastrointest Pharmacol Ther 2020; 11:69-78. [PMID: 32953227 PMCID: PMC7475772 DOI: 10.4292/wjgpt.v11.i4.69] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2020] [Revised: 06/25/2020] [Accepted: 08/16/2020] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND The existence of genetic anticipation has been long disputed in inflammatory bowel disease (IBD) in the absence of the explanatory mechanism.
AIM To determine whether it was predictive of genetic anticipation, we evaluated telomere length in IBD. We hypothesized that multiplex IBD families exhibit a genetic defect impacting telomere maintenance mechanisms.
METHODS We studied three IBD families with multiple affected members in three successive generations. We determined telomere length (TL) in lymphocytes and granulocytes from peripheral blood of the affected members using flow cytometry and fluorescence in-situ hybridization (flow FISH). We also performed whole exome sequencing in the blood of all available family members and used PhenoDB to identify potential candidate gene variants with recessive or dominant modes of inheritance.
RESULTS Out of twenty-four patients of European descent selected to participate in the study, eleven patients, eight parent-child pairs affected by IBD, were included in the genetic anticipation analysis. Median difference in age at diagnosis between two successive generations was 16.5 years, with earlier age at onset in the younger generations. In most of the affected members, the disease harbored similar gastrointestinal and extraintestinal involvement but was more aggressive among the younger generations. TL was not associated with earlier age at onset or more severe disease in members of successive generations affected by IBD. NOD2 gene mutations were present in the Crohn’s disease patients of one family. However, no gene variants were identified as potential candidates for inheritance.
CONCLUSION Telomere shortening appears unlikely to be involved in mechanisms of possible genetic anticipation in IBD. Further studies using a larger sample size are required to confirm or refute our findings.
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Affiliation(s)
- Brindusa Truta
- Steven R Brant, Division of Gastroenterology & Hepatology, Johns Hopkins University School of Medicine, Baltimore, MD 21210, United States
| | - Elizabeth Wohler
- McKusick-Nathan Institute of Genetics, Johns Hopkins School of Medicine, Baltimore, MD 21205, United States
| | - Nara Sobreira
- McKusick-Nathan Institute of Genetics, Johns Hopkins School of Medicine, Baltimore, MD 21205, United States
| | - Lisa W. Datta
- Steven R Brant, Division of Gastroenterology & Hepatology, Johns Hopkins University School of Medicine, Baltimore, MD 21210, United States
| | - Steven R. Brant
- Division of Gastroenterology and Hepatology, Department of Medicine, Rutgers-Robert Wood Johnson Medical School, NJ, 08901, United States
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29
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Lex K, Maia Gil M, Lopes-Bastos B, Figueira M, Marzullo M, Giannetti K, Carvalho T, Ferreira MG. Telomere shortening produces an inflammatory environment that increases tumor incidence in zebrafish. Proc Natl Acad Sci U S A 2020; 117:15066-15074. [PMID: 32554492 PMCID: PMC7334448 DOI: 10.1073/pnas.1920049117] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Cancer incidence increases exponentially with age when human telomeres are shorter. Similarly, telomerase reverse transcriptase (tert) mutant zebrafish have premature short telomeres and anticipate cancer incidence to younger ages. However, because short telomeres constitute a road block to cell proliferation, telomere shortening is currently viewed as a tumor suppressor mechanism and should protect from cancer. This conundrum is not fully understood. In our current study, we report that telomere shortening promotes cancer in a noncell autonomous manner. Using zebrafish chimeras, we show increased incidence of invasive melanoma when wild-type (WT) tumors are generated in tert mutant zebrafish. Tissues adjacent to melanoma lesions (skin) and distant organs (intestine) in tert mutants exhibited higher levels of senescence and inflammation. In addition, we transferred second generation (G2) tert blastula cells into WT to produce embryo chimeras. Cells with very short telomeres induced increased tumor necrosis factor1-α (TNF1-α) expression and senescence in larval tissues in a noncell autonomous manner, creating an inflammatory environment. Considering that inflammation is protumorigenic, we transplanted melanoma-derived cells into G2 tert zebrafish embryos and observed that tissue environment with short telomeres leads to increased tumor development. To test if inflammation was necessary for this effect, we treated melanoma transplants with nonsteroid anti-inflammatory drugs and show that higher melanoma dissemination can be averted. Thus, apart from the cell autonomous role of short telomeres in contributing to genome instability, we propose that telomere shortening with age causes systemic chronic inflammation leading to increased tumor incidence.
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Affiliation(s)
- Kirsten Lex
- Telomere and Genome Stability Laboratory, Instituto Gulbenkian de Ciência, 2781-901 Oeiras, Portugal
| | - Mariana Maia Gil
- Telomere and Genome Stability Laboratory, Instituto Gulbenkian de Ciência, 2781-901 Oeiras, Portugal
| | - Bruno Lopes-Bastos
- Telomere and Genome Stability Laboratory, Instituto Gulbenkian de Ciência, 2781-901 Oeiras, Portugal
- Institute for Research on Cancer and Aging of Nice (IRCAN), Université Côte d'Azur, UMR7284 U1081 UNS, 06107 Nice, France
| | - Margarida Figueira
- Telomere and Genome Stability Laboratory, Instituto Gulbenkian de Ciência, 2781-901 Oeiras, Portugal
| | - Marta Marzullo
- Telomere and Genome Stability Laboratory, Instituto Gulbenkian de Ciência, 2781-901 Oeiras, Portugal
| | - Kety Giannetti
- Telomere and Genome Stability Laboratory, Instituto Gulbenkian de Ciência, 2781-901 Oeiras, Portugal
| | - Tânia Carvalho
- Champalimaud Centre for the Unknown, Champalimaud Foundation, Av Brasilia, 1400-038 Lisbon, Portugal
| | - Miguel Godinho Ferreira
- Telomere and Genome Stability Laboratory, Instituto Gulbenkian de Ciência, 2781-901 Oeiras, Portugal;
- Institute for Research on Cancer and Aging of Nice (IRCAN), Université Côte d'Azur, UMR7284 U1081 UNS, 06107 Nice, France
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30
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Telomere attrition and dysfunction: a potential trigger of the progeroid phenotype in nijmegen breakage syndrome. Aging (Albany NY) 2020; 12:12342-12375. [PMID: 32564008 PMCID: PMC7343506 DOI: 10.18632/aging.103453] [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: 01/08/2020] [Accepted: 05/27/2020] [Indexed: 12/17/2022]
Abstract
Background: Nibrin, as part of the NBN/MRE11/RAD50 complex, is mutated in Nijmegen breakage syndrome (NBS), which leads to impaired DNA damage response and lymphoid malignancy. Results: Telomere length (TL) was markedly reduced in homozygous patients (and comparably so in all chromosomes) by ~40% (qPCR) and was slightly reduced in NBS heterozygotes older than 30 years (~25% in qPCR), in accordance with the respective cancer rates. Humanized cancer-free NBS mice had normal TL. Telomere elongation was inducible by telomerase and/or alternative telomere lengthening but was associated with abnormal expression of telomeric genes involved in aging and/or cell growth. Lymphoblastoid cells from NBS patients with long survival times (>12 years) displayed the shortest telomeres and low caspase 7 activity. Conclusions: NBS is a secondary telomeropathy. The two-edged sword of telomere attrition enhances the cancer-prone situation in NBS but can also lead to a relatively stable cellular phenotype in tumor survivors. Results suggest a modular model for progeroid syndromes with abnormal expression of telomeric genes as a molecular basis. Methods: We studied TL and function in 38 homozygous individuals, 27 heterozygotes, one homozygous fetus, six NBS lymphoblastoid cell lines, and humanized NBS mice, all with the same founder NBN mutation: c.657_661del5.
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Whittemore K, Derevyanko A, Martinez P, Serrano R, Pumarola M, Bosch F, Blasco MA. Telomerase gene therapy ameliorates the effects of neurodegeneration associated to short telomeres in mice. Aging (Albany NY) 2020; 11:2916-2948. [PMID: 31140977 PMCID: PMC6555470 DOI: 10.18632/aging.101982] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Accepted: 05/17/2019] [Indexed: 12/26/2022]
Abstract
Neurodegenerative diseases associated with old age such as Alzheimer’s disease present major problems for society, and they currently have no cure. The telomere protective caps at the ends of chromosomes shorten with age, and when they become critically short, they can induce a persistent DNA damage response at chromosome ends, triggering secondary cellular responses such as cell death and cellular senescence. Mice and humans with very short telomeres owing to telomerase deficiencies have an earlier onset of pathologies associated with loss of the regenerative capacity of tissues. However, the effects of short telomeres in very low proliferative tissues such as the brain have not been thoroughly investigated. Here, we describe a mouse model of neurodegeneration owing to presence of short telomeres in the brain as the consequence of telomerase deficiency. Interestingly, we find similar signs of neurodegeneration in very old mice as the consequence of physiological mouse aging. Next, we demonstrate that delivery of telomerase gene therapy to the brain of these mice results in amelioration of some of these neurodegeneration phenotypes. These findings suggest that short telomeres contribute to neurodegeneration diseases with aging and that telomerase activation may have a therapeutic value in these diseases.
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Affiliation(s)
- Kurt Whittemore
- Telomeres and Telomerase Group, Molecular Oncology Program, Spanish National Cancer Centre (CNIO), Madrid 28029, Spain
| | - Aksinya Derevyanko
- Telomeres and Telomerase Group, Molecular Oncology Program, Spanish National Cancer Centre (CNIO), Madrid 28029, Spain
| | - Paula Martinez
- Telomeres and Telomerase Group, Molecular Oncology Program, Spanish National Cancer Centre (CNIO), Madrid 28029, Spain
| | - Rosa Serrano
- Telomeres and Telomerase Group, Molecular Oncology Program, Spanish National Cancer Centre (CNIO), Madrid 28029, Spain
| | - Martí Pumarola
- Unit of Murine and Comparative Pathology (UPMiC), Department of Animal Medicine and Surgery, Veterinary Faculty, Universitat Autònoma de Barcelona, 08193 Bellaterra (Cerdanyola del Vallès), Barcelona, Spain.,Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Universitat Autònoma de Barcelona, 08193 Bellaterra (Cerdanyola del Vallès), Barcelona, Spain
| | - Fàtima Bosch
- Center of Animal Biotechnology and Gene Therapy, Department of Animal Medicine and Surgery, Universitat Autònoma de Barcelona, Bellaterra 08193, Spain.,Center of Animal Biotechnology and Gene Therapy, Department of Biochemistry and Molecular Biology, School of Veterinary Medicine, Universitat Autònoma de Barcelona, Bellaterra 08193, Spain
| | - Maria A Blasco
- Telomeres and Telomerase Group, Molecular Oncology Program, Spanish National Cancer Centre (CNIO), Madrid 28029, Spain
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Li C, Stoma S, Lotta LA, Warner S, Albrecht E, Allione A, Arp PP, Broer L, Buxton JL, Da Silva Couto Alves A, Deelen J, Fedko IO, Gordon SD, Jiang T, Karlsson R, Kerrison N, Loe TK, Mangino M, Milaneschi Y, Miraglio B, Pervjakova N, Russo A, Surakka I, van der Spek A, Verhoeven JE, Amin N, Beekman M, Blakemore AI, Canzian F, Hamby SE, Hottenga JJ, Jones PD, Jousilahti P, Mägi R, Medland SE, Montgomery GW, Nyholt DR, Perola M, Pietiläinen KH, Salomaa V, Sillanpää E, Suchiman HE, van Heemst D, Willemsen G, Agudo A, Boeing H, Boomsma DI, Chirlaque MD, Fagherazzi G, Ferrari P, Franks P, Gieger C, Eriksson JG, Gunter M, Hägg S, Hovatta I, Imaz L, Kaprio J, Kaaks R, Key T, Krogh V, Martin NG, Melander O, Metspalu A, Moreno C, Onland-Moret NC, Nilsson P, Ong KK, Overvad K, Palli D, Panico S, Pedersen NL, Penninx BWJH, Quirós JR, Jarvelin MR, Rodríguez-Barranco M, Scott RA, Severi G, Slagboom PE, Spector TD, Tjonneland A, Trichopoulou A, Tumino R, Uitterlinden AG, van der Schouw YT, van Duijn CM, Weiderpass E, Denchi EL, Matullo G, Butterworth AS, Danesh J, Samani NJ, Wareham NJ, Nelson CP, Langenberg C, Codd V. Genome-wide Association Analysis in Humans Links Nucleotide Metabolism to Leukocyte Telomere Length. Am J Hum Genet 2020; 106:389-404. [PMID: 32109421 PMCID: PMC7058826 DOI: 10.1016/j.ajhg.2020.02.006] [Citation(s) in RCA: 103] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Accepted: 02/10/2020] [Indexed: 01/02/2023] Open
Abstract
Leukocyte telomere length (LTL) is a heritable biomarker of genomic aging. In this study, we perform a genome-wide meta-analysis of LTL by pooling densely genotyped and imputed association results across large-scale European-descent studies including up to 78,592 individuals. We identify 49 genomic regions at a false dicovery rate (FDR) < 0.05 threshold and prioritize genes at 31, with five highlighting nucleotide metabolism as an important regulator of LTL. We report six genome-wide significant loci in or near SENP7, MOB1B, CARMIL1, PRRC2A, TERF2, and RFWD3, and our results support recently identified PARP1, POT1, ATM, and MPHOSPH6 loci. Phenome-wide analyses in >350,000 UK Biobank participants suggest that genetically shorter telomere length increases the risk of hypothyroidism and decreases the risk of thyroid cancer, lymphoma, and a range of proliferative conditions. Our results replicate previously reported associations with increased risk of coronary artery disease and lower risk for multiple cancer types. Our findings substantially expand current knowledge on genes that regulate LTL and their impact on human health and disease.
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Affiliation(s)
- Chen Li
- MRC Epidemiology Unit, University of Cambridge, CB2 0SL, United Kingdom; NIHR Leicester Biomedical Research Centre, Glenfield Hospital, Leicester, LE3 9QP, United Kingdom
| | - Svetlana Stoma
- Department of Cardiovascular Sciences, University of Leicester, LE3 9QP, United Kingdom; NIHR Leicester Biomedical Research Centre, Glenfield Hospital, Leicester, LE3 9QP, United Kingdom
| | - Luca A Lotta
- MRC Epidemiology Unit, University of Cambridge, CB2 0SL, United Kingdom
| | - Sophie Warner
- Department of Cardiovascular Sciences, University of Leicester, LE3 9QP, United Kingdom
| | - Eva Albrecht
- Institute of Epidemiology, Helmholtz Zentrum München-German Research Centre for Environmental Health, D-85764 Neuherberg, Germany
| | - Alessandra Allione
- Department of Medical Science, Genomic Variation and Translational Research Unit, University of Turin, 10126 Turin, Italy; Italian Institute for Genomic Medicine (IIGM), 10126 Turin, Italy
| | - Pascal P Arp
- Department of Internal Medicine, Erasmus Medical Centre, Postbus 2040, 3000 CA, Rotterdam, the Netherlands
| | - Linda Broer
- Department of Internal Medicine, Erasmus Medical Centre, Postbus 2040, 3000 CA, Rotterdam, the Netherlands
| | - Jessica L Buxton
- School of Life Sciences, Pharmacy, and Chemistry, Kingston University, Kingston upon Thames, KT1 2EE, United Kingdom; Genetics and Genomic Medicine Programme, UCL Great Ormond Street Institute of Child Health, London, WC1N 1EH, United Kingdom
| | - Alexessander Da Silva Couto Alves
- School of Public Health, Imperial College London, St Mary's Hospital, London W2 1PG, United Kingdom; School of Biosciences and Medicine, University of Surrey, Guildford, GU2 7XH, United Kingdom
| | - Joris Deelen
- Max Planck Institute for Biology of Ageing, D-50931, Cologne, Germany; Department of Biomedical Data Sciences, Section of Molecular Epidemiology, Leiden University Medical Centre, PO Box 9600, 2300 RC, Leiden, the Netherlands
| | - Iryna O Fedko
- Department of Biological Psychology, Vrije Universteit, 1081 BT Amsterdam, the Netherlands
| | - Scott D Gordon
- Genetic Epidemiology, QIMR Berghofer Medical Research Institute, Queensland, 4006 Australia
| | - Tao Jiang
- BHF Cardiovascular Epidemiology Unit, Department of Public Health and Primary Care, University of Cambridge, CB1 8RN, United Kingdom
| | - Robert Karlsson
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm 17177, Sweden
| | - Nicola Kerrison
- MRC Epidemiology Unit, University of Cambridge, CB2 0SL, United Kingdom
| | - Taylor K Loe
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Massimo Mangino
- Department of Twin Research and Genetic Epidemiology, Kings College London, London SE1 7EH, United Kingdom; NIHR Biomedical Research Centre at Guy's and St Thomas' Foundation Trust, London SE1 9RT, United Kingdom
| | - Yuri Milaneschi
- Department of Psychiatry, Amsterdam Public Health and Amsterdam Neuroscience, Amsterdam UMC/Vrije Universiteit, 1081HJ, Amsterdam, the Netherlands
| | - Benjamin Miraglio
- Institute for Molecular Medicine Finland (FIMM), PO Box 20, 00014 University of Helsinki, Finland
| | - Natalia Pervjakova
- Estonian Genome Centre, Institute of Genomics, University of Tartu, 51010, Tartu, Estonia
| | - Alessia Russo
- Department of Medical Science, Genomic Variation and Translational Research Unit, University of Turin, 10126 Turin, Italy; Italian Institute for Genomic Medicine (IIGM), 10126 Turin, Italy
| | - Ida Surakka
- Institute for Molecular Medicine Finland (FIMM), PO Box 20, 00014 University of Helsinki, Finland; Division of Cardiovascular Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109, USA
| | - Ashley van der Spek
- Department of Epidemiology, Erasmus Medical Centre, Postbus 2040, 3000 CA, Rotterdam, the Netherlands
| | - Josine E Verhoeven
- Department of Psychiatry, Amsterdam Public Health and Amsterdam Neuroscience, Amsterdam UMC/Vrije Universiteit, 1081HJ, Amsterdam, the Netherlands
| | - Najaf Amin
- Department of Epidemiology, Erasmus Medical Centre, Postbus 2040, 3000 CA, Rotterdam, the Netherlands
| | - Marian Beekman
- Department of Biomedical Data Sciences, Section of Molecular Epidemiology, Leiden University Medical Centre, PO Box 9600, 2300 RC, Leiden, the Netherlands
| | - Alexandra I Blakemore
- Department of Life Sciences, Brunel University London, Uxbridge UB8 3PH, United Kingdom; Department of Medicine, Imperial College London, London, W12 0HS, United Kingdom
| | - Federico Canzian
- Genomic Epidemiology Group, German Cancer Research Centre (DKFZ), 69120 Heidelberg, Germany
| | - Stephen E Hamby
- Department of Cardiovascular Sciences, University of Leicester, LE3 9QP, United Kingdom; NIHR Leicester Biomedical Research Centre, Glenfield Hospital, Leicester, LE3 9QP, United Kingdom
| | - Jouke-Jan Hottenga
- Department of Biological Psychology, Vrije Universteit, 1081 BT Amsterdam, the Netherlands
| | - Peter D Jones
- Department of Cardiovascular Sciences, University of Leicester, LE3 9QP, United Kingdom
| | - Pekka Jousilahti
- Department of Public Health Solutions, Finnish Institute for Health and Welfare, PO Box 30, FI-00271 Helsinki, Finland
| | - Reedik Mägi
- Estonian Genome Centre, Institute of Genomics, University of Tartu, 51010, Tartu, Estonia
| | - Sarah E Medland
- Genetic Epidemiology, QIMR Berghofer Medical Research Institute, Queensland, 4006 Australia
| | - Grant W Montgomery
- Institute for Molecular Bioscience, The University of Queensland, 4072, Queensland, Australia
| | - Dale R Nyholt
- Genetic Epidemiology, QIMR Berghofer Medical Research Institute, Queensland, 4006 Australia; School of Biomedical Sciences and Institute of Health and Biomedical Innovation, Queensland University of Technology, Queensland, 4059, Australia
| | - Markus Perola
- Department of Public Health Solutions, Finnish Institute for Health and Welfare, PO Box 30, FI-00271 Helsinki, Finland; Research Program for Clinical and Molecular Metabolism, Faculty of Medicine, Biomedicum 1, PO Box 63, 00014 University of Helsinki, Finland
| | - Kirsi H Pietiläinen
- Obesity Research Unit, Research Program for Clinical and Molecular Metabolism, Haartmaninkatu 8, 00014 University of Helsinki, Helsinki, Finland; Obesity Center, Abdominal Center, Endocrinology, Helsinki University Hospital and University of Helsinki, Haartmaninkatu 4, 00029 HUS, Helsinki, Finland
| | - Veikko Salomaa
- Department of Public Health Solutions, Finnish Institute for Health and Welfare, PO Box 30, FI-00271 Helsinki, Finland
| | - Elina Sillanpää
- Institute for Molecular Medicine Finland (FIMM), PO Box 20, 00014 University of Helsinki, Finland; Gerontology Research Center, Faculty of Sport and Health Sciences, PO Box 35, 40014 University of Jyväskylä, Finland
| | - H Eka Suchiman
- Department of Biomedical Data Sciences, Section of Molecular Epidemiology, Leiden University Medical Centre, PO Box 9600, 2300 RC, Leiden, the Netherlands
| | - Diana van Heemst
- Department of Internal Medicine, Section of Gerontology and Geriatrics, Leiden University Medical Centre, PO Box 9600, 2300 RC, Leiden, the Netherlands
| | - Gonneke Willemsen
- Department of Biological Psychology, Vrije Universteit, 1081 BT Amsterdam, the Netherlands
| | - Antonio Agudo
- Unit of Nutrition, Environment, and Cancer, Cancer Epidemiology Research Program, Catalan Institute of Oncology-ICO, Group of Research on Nutrition and Cancer, Bellvitge Biomedical Research Institute-IDIBELL, L'Hospitalet of Llobregat, 08908 Barcelona, Spain
| | - Heiner Boeing
- German Institute of Human Nutrition Potsdam-Rehbruecke, 14558 Nuthetal, Germany
| | - Dorret I Boomsma
- Department of Biological Psychology, Vrije Universteit, 1081 BT Amsterdam, the Netherlands
| | - Maria-Dolores Chirlaque
- Department of Epidemiology, Murcia Regional Health Council, IMIB-Arrixaca, 30008, Murcia, Spain; CIBER of Epidemiology and Public Health (CIBERESP), 28029 Madrid, Spain
| | - Guy Fagherazzi
- Center of Research in Epidemiology and Population Health, UMR 1018 Inserm, Institut Gustave Roussy, Paris-Sud Paris-Saclay University, 94805 Villejuif, France; Digital Epidemiology Research Hub, Department of Population Health, Luxembourg Institute of Health, L-1445 Strassen, Luxembourg
| | - Pietro Ferrari
- International Agency for Research on Cancer, 69372 Lyon, France
| | - Paul Franks
- Department of Clinical Sciences, Clinical Research Center, Skåne University Hospital, Lund University, 20502 Malmö, Sweden; Department of Public Health and Clinical Medicine, Umeå University, 90187 Umeå, Sweden
| | - Christian Gieger
- Institute of Epidemiology, Helmholtz Zentrum München-German Research Centre for Environmental Health, D-85764 Neuherberg, Germany; Research Unit of Molecular Epidemiology, Helmholtz Zentrum München, German Research Center for Environmental Health, D 85764 Neuherberg, Germany; German Center for Diabetes Research (DZD e.V.), D-85764 Neuherberg, Germany
| | - Johan Gunnar Eriksson
- Department of General Practice and Primary Health Care, University of Helsinki and Helsinki University Hospital, PO Box 20, 00014 University of Helsinki, Finland; Folkhälsan Research Centre, PO Box 20, 00014 University of Helsinki, Finland; Obstetrics and Gynaecology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597
| | - Marc Gunter
- International Agency for Research on Cancer, 69372 Lyon, France
| | - Sara Hägg
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm 17177, Sweden
| | - Iiris Hovatta
- SleepWell Research Program, Haartmaninkatu 3, 00014 University of Helsinki, Finland; Department of Psychology and Logopedics, Haartmaninkatu 3, 00014 University of Helsinki, Finland
| | - Liher Imaz
- Ministry of Health of the Basque Government, Public Health Division of Gipuzkoa, 20013 Donostia-San Sebastian, Spain; Biodonostia Health Research Institute, 20014 Donostia-San Sebastian, Spain
| | - Jaakko Kaprio
- Institute for Molecular Medicine Finland (FIMM), PO Box 20, 00014 University of Helsinki, Finland; Department of Public Health, PO Box 20, 00014 University of Helsinki, Finland
| | - Rudolf Kaaks
- Division of Cancer Epidemiology, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
| | - Timothy Key
- Cancer Epidemiology Unit, Nuffield Department of Population Health, University of Oxford, OX3 7LF, United Kingdom
| | - Vittorio Krogh
- Epidemiology and Prevention Unit, Fondazione IRCCS-Istituto Nazionale dei Tumori, 20133 Milan, Italy
| | - Nicholas G Martin
- Genetic Epidemiology, QIMR Berghofer Medical Research Institute, Queensland, 4006 Australia
| | - Olle Melander
- Department of Clinical Sciences, Hypertension, and Cardiovascular Disease, Lund University, 21428 Malmö, Sweden
| | - Andres Metspalu
- Estonian Genome Centre, Institute of Genomics, University of Tartu, 51010, Tartu, Estonia
| | | | - N Charlotte Onland-Moret
- Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht University, 3584 CG Utrecht, the Netherlands
| | - Peter Nilsson
- Department of Clinical Sciences, Clinical Research Center, Skåne University Hospital, Lund University, 20502 Malmö, Sweden
| | - Ken K Ong
- MRC Epidemiology Unit, University of Cambridge, CB2 0SL, United Kingdom; Department of Paediatrics, University of Cambridge, CB2 0QQ, United Kingdom
| | - Kim Overvad
- Department of Public Health, Aarhus University, DK-8000 Aarhus, Denmark; Department of Cardiology, Aalborg University Hospital, DK-9000 Aalborg, Denmark
| | - Domenico Palli
- Cancer Risk Factors and Life-Style Epidemiology Unit, Institute for Cancer Research-ISPRO, 50139 Florence, Italy
| | - Salvatore Panico
- Dipartimento di Medicina Clinica e Chirurgia, Federico II University, 80131 Naples, Italy
| | - Nancy L Pedersen
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm 17177, Sweden
| | - Brenda W J H Penninx
- Department of Psychiatry, Amsterdam Public Health and Amsterdam Neuroscience, Amsterdam UMC/Vrije Universiteit, 1081HJ, Amsterdam, the Netherlands
| | - J Ramón Quirós
- Consejería de Sanidad, Public Health Directorate, 33006 Asturias, Spain
| | - Marjo Riitta Jarvelin
- School of Public Health, Imperial College London, St Mary's Hospital, London W2 1PG, United Kingdom; School of Epidemiology and Biostatistics, Imperial College London, SW7 2AZ, United Kingdom
| | - Miguel Rodríguez-Barranco
- Center of Research in Epidemiology and Population Health, UMR 1018 Inserm, Institut Gustave Roussy, Paris-Sud Paris-Saclay University, 94805 Villejuif, France; Andalusian School of Public Health (EASP), 18080 Granada, Spain; Instituto de Investigación Biosanitaria ibs.GRANADA, 18012 Granada, Spain
| | - Robert A Scott
- MRC Epidemiology Unit, University of Cambridge, CB2 0SL, United Kingdom
| | - Gianluca Severi
- CESP, Facultés de médecine, Université Paris, 94805 Villejuif, France; Gustave Roussy, 94805 Villejuif, France; Department of Statistics, Computer Science, Applications "G. Parenti," University of Florence, 50134 Firenze, Italy
| | - P Eline Slagboom
- Max Planck Institute for Biology of Ageing, D-50931, Cologne, Germany; Department of Biomedical Data Sciences, Section of Molecular Epidemiology, Leiden University Medical Centre, PO Box 9600, 2300 RC, Leiden, the Netherlands
| | - Tim D Spector
- Department of Twin Research and Genetic Epidemiology, Kings College London, London SE1 7EH, United Kingdom
| | - Anne Tjonneland
- Danish Cancer Society Research Center, 2100 Copenhagen, Denmark
| | | | - Rosario Tumino
- Cancer Registry and Histopathology Department, Provincial Health Authority (ASP), 97100 Ragusa, Italy; Hyblean Association for Research on Epidemiology, No Profit Organization, 97100 Ragusa, Italy
| | - André G Uitterlinden
- Department of Internal Medicine, Erasmus Medical Centre, Postbus 2040, 3000 CA, Rotterdam, the Netherlands
| | - Yvonne T van der Schouw
- Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht University, 3584 CG Utrecht, the Netherlands
| | - Cornelia M van Duijn
- Department of Epidemiology, Erasmus Medical Centre, Postbus 2040, 3000 CA, Rotterdam, the Netherlands; Nuffield Department of Population Health, University of Oxford, OX3 7LF, United Kingdom
| | | | - Eros Lazzerini Denchi
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA; Laboratory of Chromosome Instability, National Cancer Institute, NIH, Bethesda, MD 20892 USA
| | - Giuseppe Matullo
- Department of Medical Science, Genomic Variation and Translational Research Unit, University of Turin, 10126 Turin, Italy; Italian Institute for Genomic Medicine (IIGM), 10126 Turin, Italy
| | - Adam S Butterworth
- BHF Cardiovascular Epidemiology Unit, Department of Public Health and Primary Care, University of Cambridge, CB1 8RN, United Kingdom; Health Data Research UK Cambridge, Wellcome Genome Campus and University of Cambridge, CB10 1SA, United Kingdom; NIHR Blood and Transplant Research Unit in Donor Health and Genomics, Department of Public Health and Primary Care, University of Cambridge, CB1 8RN, United Kingdom; BHF Cambridge Centre of Excellence, School of Clinical Medicine, Addenbrookes' Hospital, Cambridge, CB2 0QQ, United Kingdom; NIHR Cambridge Biomedical Research Centre, School of Clinical Medicine, Addenbrooke's Hospital, Cambridge CB2 0QQ, United Kingdom
| | - John Danesh
- BHF Cardiovascular Epidemiology Unit, Department of Public Health and Primary Care, University of Cambridge, CB1 8RN, United Kingdom; Health Data Research UK Cambridge, Wellcome Genome Campus and University of Cambridge, CB10 1SA, United Kingdom; NIHR Blood and Transplant Research Unit in Donor Health and Genomics, Department of Public Health and Primary Care, University of Cambridge, CB1 8RN, United Kingdom; Department of Human Genetics, Wellcome Sanger Institute, Hinxton, CB10 1SA, United Kingdom; BHF Cambridge Centre of Excellence, School of Clinical Medicine, Addenbrookes' Hospital, Cambridge, CB2 0QQ, United Kingdom; NIHR Cambridge Biomedical Research Centre, School of Clinical Medicine, Addenbrooke's Hospital, Cambridge CB2 0QQ, United Kingdom
| | - Nilesh J Samani
- Department of Cardiovascular Sciences, University of Leicester, LE3 9QP, United Kingdom; NIHR Leicester Biomedical Research Centre, Glenfield Hospital, Leicester, LE3 9QP, United Kingdom
| | | | - Christopher P Nelson
- Department of Cardiovascular Sciences, University of Leicester, LE3 9QP, United Kingdom; NIHR Leicester Biomedical Research Centre, Glenfield Hospital, Leicester, LE3 9QP, United Kingdom
| | - Claudia Langenberg
- MRC Epidemiology Unit, University of Cambridge, CB2 0SL, United Kingdom.
| | - Veryan Codd
- Department of Cardiovascular Sciences, University of Leicester, LE3 9QP, United Kingdom; NIHR Leicester Biomedical Research Centre, Glenfield Hospital, Leicester, LE3 9QP, United Kingdom.
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Srinivas N, Rachakonda S, Kumar R. Telomeres and Telomere Length: A General Overview. Cancers (Basel) 2020; 12:E558. [PMID: 32121056 PMCID: PMC7139734 DOI: 10.3390/cancers12030558] [Citation(s) in RCA: 129] [Impact Index Per Article: 32.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 02/24/2020] [Accepted: 02/26/2020] [Indexed: 02/06/2023] Open
Abstract
Telomeres are highly conserved tandem nucleotide repeats that include proximal double-stranded and distal single-stranded regions that in complex with shelterin proteins afford protection at chromosomal ends to maintain genomic integrity. Due to the inherent limitations of DNA replication and telomerase suppression in most somatic cells, telomeres undergo age-dependent incremental attrition. Short or dysfunctional telomeres are recognized as DNA double-stranded breaks, triggering cells to undergo replicative senescence. Telomere shortening, therefore, acts as a counting mechanism that drives replicative senescence by limiting the mitotic potential of cells. Telomere length, a complex hereditary trait, is associated with aging and age-related diseases. Epidemiological data, in general, support an association with varying magnitudes between constitutive telomere length and several disorders, including cancers. Telomere attrition is also influenced by oxidative damage and replicative stress caused by genetic, epigenetic, and environmental factors. Several single nucleotide polymorphisms at different loci, identified through genome-wide association studies, influence inter-individual variation in telomere length. In addition to genetic factors, environmental factors also influence telomere length during growth and development. Telomeres hold potential as biomarkers that reflect the genetic predisposition together with the impact of environmental conditions and as targets for anti-cancer therapies.
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Affiliation(s)
| | | | - Rajiv Kumar
- Division of Functional Genome Analysis, German Cancer Research Center, Im Neunheimer Feld 580, 69120 Heidelberg, Germany; (N.S.); (S.R.)
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Peters-Hall JR, Min J, Tedone E, Sho S, Siteni S, Mender I, Shay JW. Proliferation of adult human bronchial epithelial cells without a telomere maintenance mechanism for over 200 population doublings. FASEB J 2020; 34:386-398. [PMID: 31914653 PMCID: PMC6956733 DOI: 10.1096/fj.201902376r] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 10/17/2019] [Accepted: 10/21/2019] [Indexed: 12/11/2022]
Abstract
To date, there is no direct evidence of telomerase activity in adult lung epithelial cells, but typical culture conditions only support cell proliferation for 30-40 population doublings (PD), a point at which telomeres remain relatively long. Here we report that in in vitro low stress culture conditions consisting of a fibroblast feeder layer, rho-associated coiled coil protein kinase inhibitor (ROCKi), and low oxygen (2%), normal human bronchial epithelial basal progenitor cells (HBECs) divide for over 200 PD without engaging a telomere maintenance mechanism (almost four times the "Hayflick limit"). HBECs exhibit critically short telomeres at 200 PD and the population of cells start to undergo replicative senescence. Subcloning these late passage cells to clonal density, to mimic lung injury in vivo, selects for rare subsets of HBECs that activate low levels of telomerase activity to maintain short telomeres. CRISPR/Cas9 knockout of human telomerase reverse transcriptase or treatment with the telomerase-mediated telomere targeting agent 6-thio-2'deoxyguanosine abrogates colony growth in these late passage cultures (>200 PD) but not in early passage cultures (<200 PD). To our knowledge, this is the first study to report such long-term growth of HBECs without a telomere maintenance mechanism. This report also provides direct evidence of telomerase activation in HBECs near senescence when telomeres are critically short. This novel cell culture system provides an experimental model to understand how telomerase is regulated in normal adult tissues.
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Affiliation(s)
- Jennifer R. Peters-Hall
- Department of Cell Biology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, USA 75390-9039
| | - Jaewon Min
- Department of Cell Biology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, USA 75390-9039
| | - Enzo Tedone
- Department of Cell Biology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, USA 75390-9039
| | - Sei Sho
- Department of Cell Biology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, USA 75390-9039
| | - Silvia Siteni
- Department of Cell Biology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, USA 75390-9039
| | - Ilgen Mender
- Department of Cell Biology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, USA 75390-9039
| | - Jerry W. Shay
- Department of Cell Biology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, USA 75390-9039
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Wang Y, Sušac L, Feigon J. Structural Biology of Telomerase. Cold Spring Harb Perspect Biol 2019; 11:cshperspect.a032383. [PMID: 31451513 DOI: 10.1101/cshperspect.a032383] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Telomerase is a DNA polymerase that extends the 3' ends of chromosomes by processively synthesizing multiple telomeric repeats. It is a unique ribonucleoprotein (RNP) containing a specialized telomerase reverse transcriptase (TERT) and telomerase RNA (TER) with its own template and other elements required with TERT for activity (catalytic core), as well as species-specific TER-binding proteins important for biogenesis and assembly (core RNP); other proteins bind telomerase transiently or constitutively to allow association of telomerase and other proteins with telomere ends for regulation of DNA synthesis. Here we describe how nuclear magnetic resonance (NMR) spectroscopy and X-ray crystallography of TER and protein domains helped define the structure and function of the core RNP, laying the groundwork for interpreting negative-stain and cryo electron microscopy (cryo-EM) density maps of Tetrahymena thermophila and human telomerase holoenzymes. As the resolution has improved from ∼30 Å to ∼5 Å, these studies have provided increasingly detailed information on telomerase architecture and mechanism.
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Affiliation(s)
- Yaqiang Wang
- Department of Chemistry and Biochemistry, University of California Los Angeles (UCLA), Los Angeles, California 90095-1569
| | - Lukas Sušac
- Department of Chemistry and Biochemistry, University of California Los Angeles (UCLA), Los Angeles, California 90095-1569
| | - Juli Feigon
- Department of Chemistry and Biochemistry, University of California Los Angeles (UCLA), Los Angeles, California 90095-1569
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36
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Li Y, Li X, Cao M, Jiang Y, Yan J, Liu Z, Yang R, Chen X, Sun P, Xiang R, Wang L, Shi Y. Seryl tRNA synthetase cooperates with POT1 to regulate telomere length and cellular senescence. Signal Transduct Target Ther 2019; 4:50. [PMID: 31815007 PMCID: PMC6882858 DOI: 10.1038/s41392-019-0078-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 04/04/2019] [Accepted: 04/23/2019] [Indexed: 12/13/2022] Open
Abstract
Deregulated telomere length is a causative factor in many physiological and pathological processes, including aging and cancer. Many studies focusing on telomeres have revealed important roles for cooperation between the Shelterin protein complex and telomerase in maintaining telomere length. However, it remains largely unknown whether and how aging-related stresses, such as deregulated protein homeostasis, impact telomere length. Here, we explored the possible roles of aminoacyl tRNA synthetases (AARSs), key enzymes catalyzing the first reactions in protein synthesis, in regulating telomere length and aging. We selected seryl tRNA synthetase (SerRS) since our previous studies discovered expanded functions of SerRS in the nucleus in addition to its canonical cytoplasmic role in protein synthesis. In this study, we revealed that overexpression of SerRS promoted cellular senescence and inhibited the growth of cervical tumor xenografts in mice by triggering the senescence of tumor cells. In the nucleus, SerRS directly bound to telomeric DNA repeats and tethered more POT1 proteins to telomeres through a direct interaction between the UNE-S domain of SerRS and the OB1 domain of POT1. We further demonstrated that SerRS-induced enrichment of POT1 prevented the recruitment of telomerase to telomeres, resulting in progressive telomere shortening. Our data suggested a possible molecular link between protein synthesis and telomere length control, the deregulation of which may be associated with aging and cancer.
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Affiliation(s)
- Yingxi Li
- School of Medicine, Nankai University, 94 Weijin Road, Tianjin, 300071 China
| | - Xiyang Li
- School of Medicine, Nankai University, 94 Weijin Road, Tianjin, 300071 China
| | - Mei Cao
- School of Medicine, Nankai University, 94 Weijin Road, Tianjin, 300071 China
| | - Yuke Jiang
- School of Medicine, Nankai University, 94 Weijin Road, Tianjin, 300071 China
| | - Jie Yan
- School of Medicine, Nankai University, 94 Weijin Road, Tianjin, 300071 China
| | - Ze Liu
- School of Medicine, Nankai University, 94 Weijin Road, Tianjin, 300071 China
| | - Rongcun Yang
- School of Medicine, Nankai University, 94 Weijin Road, Tianjin, 300071 China
| | - Xu Chen
- Tianjin Key Laboratory Human Development and Reproductive Regulation, Nankai University Affiliated Hospital of Obstetrics and Gynecology, Tianjin, China
| | - Peiqing Sun
- Department of Cancer Biology, Wake Forest Comprehensive Cancer Center, Wake Forest School of Medicine, Winston-Salem, NC USA
| | - Rong Xiang
- School of Medicine, Nankai University, 94 Weijin Road, Tianjin, 300071 China
| | - Longlong Wang
- School of Medicine, Nankai University, 94 Weijin Road, Tianjin, 300071 China
- Tianjin Key Laboratory Human Development and Reproductive Regulation, Nankai University Affiliated Hospital of Obstetrics and Gynecology, Tianjin, China
| | - Yi Shi
- School of Medicine, Nankai University, 94 Weijin Road, Tianjin, 300071 China
- Tianjin Key Laboratory Human Development and Reproductive Regulation, Nankai University Affiliated Hospital of Obstetrics and Gynecology, Tianjin, China
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Powell-Wiley TM, Gebreab SY, Claudel SE, Ayers C, Andrews MR, Adu-Brimpong J, Berrigan D, Davis SK. The relationship between neighborhood socioeconomic deprivation and telomere length: The 1999-2002 National Health and Nutrition Examination Survey. SSM Popul Health 2019; 10:100517. [PMID: 31872036 PMCID: PMC6909179 DOI: 10.1016/j.ssmph.2019.100517] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Revised: 11/13/2019] [Accepted: 11/14/2019] [Indexed: 12/29/2022] Open
Abstract
Socioeconomically disadvantaged neighborhoods have been associated with poor health outcomes. Little is known about the biological mechanism by which deprived neighborhood conditions exert negative influences on health. Data from the 1999–2002 National Health and Nutrition Examination Surveys (NHANES) were used to assess the relationship between neighborhood deprivation index (NDI) and log-transformed leukocyte telomere length (LTL) via multilevel modeling to control for census tract level clustering. Models were constructed using tertiles of NDI (ref = low NDI). NDI was calculated using census tract level socioeconomic indicators from the 2000 U.S. Census. The sample (n = 5,106 adults) was 49.8% female and consisted of 82.9% non-Hispanic whites, 9.4% non-Hispanic blacks, and 7.6% Mexican Americans. Mean age was 45.8 years. Residents of neighborhoods with high NDI were younger, non-white, had lower educational attainment, and had a lower poverty to income ratio (all p < 0.0001). Neighborhood deprivation was inversely associated with LTL among individuals living in neighborhoods with medium NDI (β = −0.043, SE = 0.012, p = 0.0005) and high NDI (β = −0.039, SE = 0.013, p = 0.003). Among men, both medium (β = −0.042, SE = 0.015, p = 0.006) and high (β = −0.047, SE = 0.015, p = 0.001) NDI were associated with shorter LTL. Among women, only medium NDI (β = −0.020, SE = 0.016, p = 0.009) was associated with shorter LTL. After controlling for individual characteristics, including individual-level socioeconomic status, increasing neighborhood socioeconomic deprivation is associated with shorter LTL among a nationally representative sample of US adults. This suggests that telomere shortening may be a mechanism through which neighborhood deprivation results in poor health outcomes. Neighborhood deprivation is inversely related to telomere length. This persists after adjusting for behavior and individual socioeconomic status. Telomere shortening in high deprivation represented 7.5 years of accelerated aging. Telomere shortening may be a mechanism linking neighborhoods and health.
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Affiliation(s)
- Tiffany M. Powell-Wiley
- National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
- National Institute on Minority Health and Health Disparities, National Institutes of Health, Bethesda, MD, USA
- Corresponding author. Social Determinants of Obesity and Cardiovascular Risk Laboratory, Cardiovascular Branch, DIR, NHLBI, Building 10-CRC, Room 5-5332, MSC 1454 10 Center Drive, Bethesda, MD, 20892, USA.
| | - Samson Y. Gebreab
- National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA
| | - Sophie E. Claudel
- National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - Colby Ayers
- Reynolds Cardiovascular Clinical Research Center, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Marcus R. Andrews
- National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - Joel Adu-Brimpong
- National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - David Berrigan
- National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Sharon K. Davis
- National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA
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38
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Dalva-Aydemir S, Akyerli CB, Yüksel ŞK, Keskin H, Yakıcıer MC. Toward In Vitro Epigenetic Drug Design for Thyroid Cancer: The Promise of PF-03814735, an Aurora Kinase Inhibitor. ACTA ACUST UNITED AC 2019; 23:486-495. [DOI: 10.1089/omi.2019.0050] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Sevim Dalva-Aydemir
- Biochemistry and Molecular Biology PhD Program, Institute of Health Sciences, Acıbadem Mehmet Ali Aydınlar University, Istanbul, Turkey
| | - Cemaliye Boylu Akyerli
- Medical Biology, School of Medicine, Acıbadem Mehmet Ali Aydınlar University, Istanbul, Turkey
| | - Şirin Kılıçturgay Yüksel
- Biochemistry and Molecular Biology PhD Program, Institute of Health Sciences, Acıbadem Mehmet Ali Aydınlar University, Istanbul, Turkey
- Department of Molecular Biology and Genetics, Faculty of Arts and Sciences, Acıbadem Mehmet Ali Aydınlar University, Istanbul, Turkey
| | - Hilal Keskin
- Biochemistry and Molecular Biology PhD Program, Institute of Health Sciences, Acıbadem Mehmet Ali Aydınlar University, Istanbul, Turkey
| | - Mustafa Cengiz Yakıcıer
- Department of Molecular Biology and Genetics, Faculty of Arts and Sciences, Acıbadem Mehmet Ali Aydınlar University, Istanbul, Turkey
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Abstract
Telomeres, the protective ends of linear chromosomes, shorten throughout an individual's lifetime. Accumulation of critically short telomeres is proposed to be a primary molecular cause of aging and age-associated diseases. Mutations in telomere maintenance genes are associated with pathologies referred to as or telomeropathies. The rate of telomere shortening throughout life is determined by endogenous (genetic) and external (nongenetic) factors. Therapeutic strategies based on telomerase activation are being developed to treat and prevent telomere-associated diseases, namely aging-related diseases and telomeropathies. Here, we review the molecular mechanisms underlying telomere driven diseases with particular emphasis on cardiovascular diseases.
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Affiliation(s)
- Paula Martínez
- From the Telomeres and Telomerase Group, Molecular Oncology Program, Spanish National Cancer Centre (CNIO), Madrid, Spain
| | - Maria A Blasco
- From the Telomeres and Telomerase Group, Molecular Oncology Program, Spanish National Cancer Centre (CNIO), Madrid, Spain
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40
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Tsoukalas D, Fragkiadaki P, Docea AO, Alegakis AK, Sarandi E, Thanasoula M, Spandidos DA, Tsatsakis A, Razgonova MP, Calina D. Discovery of potent telomerase activators: Unfolding new therapeutic and anti-aging perspectives. Mol Med Rep 2019; 20:3701-3708. [PMID: 31485647 PMCID: PMC6755196 DOI: 10.3892/mmr.2019.10614] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 08/09/2019] [Indexed: 12/14/2022] Open
Abstract
Telomere length, a marker of cellular aging, decreases with age and it has been associated with aging‑related diseases. Environmental factors, including diet and lifestyle factors, affect the rate of telomere shortening which can be reversed by telomerase. Telomerase activation by natural molecules has been suggested to be an anti‑aging modulator that can play a role in the treatment of aging‑related diseases. This study aimed to investigate the effect of natural compounds on telomerase activity in human peripheral blood mononuclear cells (PBMCs). The tested compounds included Centella asiatica extract formulation (08AGTLF), Astragalus extract formulation (Nutrient 4), TA‑65 (containing Astragalus membranaceus extract), oleanolic acid (OA), maslinic acid (MA), and 3 multi‑nutrient formulas (Nutrients 1, 2 and 3) at various concentrations. The mean absorbance values of telomerase activity measured following treatment with some of the above‑mentioned formulations were statistically significantly higher compared to those of the untreated cells. In particular, in order of importance with respect to telomerase activation from highest to lowest, 08AGTLF, OA, Nutrient 4, TA‑65, MA, Nutrient 3 and Nutrient 2, triggered statistically significant increase in telomerase activity compared to the untreated cells. 08AGTLF reached the highest levels of telomerase activity reported to date, at least to our knowledge, increasing telomerase activity by 8.8 folds compared to untreated cells, while Nutrient 4 and OA were also potent activators (4.3‑fold and 5.9‑fold increase, respectively). On the whole, this study indicates that the synergistic effect of nutrients and natural compounds can activate telomerase and produce more potent formulations. Human clinical studies using these formulations are required to evaluate their mode of action. This would reveal the health benefits of telomerase activation through natural molecules and would shed new light onto the treatment of aging‑related diseases.
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Affiliation(s)
- Dimitris Tsoukalas
- Metabolomic Μedicine, Health Clinics for Autoimmune and Chronic Diseases, 10674 Athens, Greece
| | - Persefoni Fragkiadaki
- Laboratory of Toxicology, Medical School, University of Crete, 71003 Heraklion, Greece
| | - Anca Oana Docea
- Department of Toxicology, University of Medicine and Pharmacy, Faculty of Pharmacy, 200349 Craiova, Romania
| | - Athanasios K Alegakis
- Laboratory of Toxicology, Medical School, University of Crete, 71003 Heraklion, Greece
| | - Evangelia Sarandi
- Metabolomic Μedicine, Health Clinics for Autoimmune and Chronic Diseases, 10674 Athens, Greece
| | - Maria Thanasoula
- Metabolomic Μedicine, Health Clinics for Autoimmune and Chronic Diseases, 10674 Athens, Greece
| | - Demetrios A Spandidos
- Laboratory of Clinical Virology, School of Medicine, University of Crete, 71003 Heraklion, Greece
| | - Aristidis Tsatsakis
- Laboratory of Toxicology, Medical School, University of Crete, 71003 Heraklion, Greece
| | | | - Daniela Calina
- Department of Clinical Pharmacy, University of Medicine and Pharmacy, Faculty of Pharmacy, 200349 Craiova, Romania
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41
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Abstract
Many recent advances have emerged in the telomere and telomerase fields. This Timeline article highlights the key advances that have expanded our views on the mechanistic underpinnings of telomeres and telomerase and their roles in ageing and disease. Three decades ago, the classic view was that telomeres protected the natural ends of linear chromosomes and that telomerase was a specific telomere-terminal transferase necessary for the replication of chromosome ends in single-celled organisms. While this concept is still correct, many diverse fields associated with telomeres and telomerase have substantially matured. These areas include the discovery of most of the key molecular components of telomerase, implications for limits to cellular replication, identification and characterization of human genetic disorders that result in premature telomere shortening, the concept that inhibiting telomerase might be a successful therapeutic strategy and roles for telomeres in regulating gene expression. We discuss progress in these areas and conclude with challenges and unanswered questions in the field.
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Affiliation(s)
- Jerry W Shay
- Department of Cell Biology, UT Southwestern Medical Center, Dallas, TX, USA.
| | - Woodring E Wright
- Department of Cell Biology, UT Southwestern Medical Center, Dallas, TX, USA
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Amir M, Mohammad T, Kumar V, Alajmi MF, Rehman MT, Hussain A, Alam P, Dohare R, Islam A, Ahmad F, Hassan MI. Structural Analysis and Conformational Dynamics of STN1 Gene Mutations Involved in Coat Plus Syndrome. Front Mol Biosci 2019; 6:41. [PMID: 31245382 PMCID: PMC6581698 DOI: 10.3389/fmolb.2019.00041] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Accepted: 05/17/2019] [Indexed: 11/13/2022] Open
Abstract
The human CST complex (CTC1-STN1-TEN1) is associated with telomere functions including genome stability. We have systemically analyzed the sequence of STN and performed structure analysis to establish its association with the Coat Plus (CP) syndrome. Many deleterious non-synonymous SNPs have been identified and subjected for structure analysis to find their pathogenic association and aggregation propensity. A 100-ns all-atom molecular dynamics simulation of WT, R135T, and D157Y structures revealed significant conformational changes in the case of mutants. Changes in hydrogen bonds, secondary structure, and principal component analysis further support the structural basis of STN1 dysfunction in such mutations. Free energy landscape analysis revealed the presence of multiple energy minima, suggesting that R135T and D157Y mutations destabilize and alter the conformational dynamics of STN1 and thus may be associated with the CP syndrome. Our study provides a valuable direction to understand the molecular basis of CP syndrome and offer a newer therapeutics approach to address CP syndrome.
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Affiliation(s)
- Mohd Amir
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, India
| | - Taj Mohammad
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, India
| | - Vijay Kumar
- Amity Institute of Neuropsychology and Neurosciences, Amity University Noida, Noida, India
| | - Mohammed F Alajmi
- Department of Pharmacognosy College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Md Tabish Rehman
- Department of Pharmacognosy College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Afzal Hussain
- Department of Pharmacognosy College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Perwez Alam
- Department of Pharmacognosy College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Ravins Dohare
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, India
| | - Asimul Islam
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, India
| | - Faizan Ahmad
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, India
| | - Md Imtaiyaz Hassan
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, India
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43
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Armando RG, Mengual Gomez DL, Maggio J, Sanmartin MC, Gomez DE. Telomeropathies: Etiology, diagnosis, treatment and follow-up. Ethical and legal considerations. Clin Genet 2019; 96:3-16. [PMID: 30820928 DOI: 10.1111/cge.13526] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 02/12/2019] [Accepted: 02/26/2019] [Indexed: 12/13/2022]
Abstract
Telomeropathies involve a wide variety of infrequent genetic diseases caused by mutations in the telomerase maintenance mechanism or the DNA damage response (DDR) system. They are considered a family of rare diseases that often share causes, molecular mechanisms and symptoms. Generally, these diseases are not diagnosed until the symptoms are advanced, diminishing the survival time of patients. Although several related syndromes may still be unrecognized this work describes those that are known, highlighting that because they are rare diseases, physicians should be trained in their early diagnosis. The etiology and diagnosis are discussed for each telomeropathy and the treatments when available, along with a new classification of this group of diseases. Ethical and legal issues related to this group of diseases are also considered.
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Affiliation(s)
- Romina G Armando
- Laboratory of Molecular Oncology, Universidad Nacional de Quilmes, Buenos Aires, Argentina
| | - Diego L Mengual Gomez
- Laboratory of Molecular Oncology, Universidad Nacional de Quilmes, Buenos Aires, Argentina
| | - Julián Maggio
- Laboratory of Molecular Oncology, Universidad Nacional de Quilmes, Buenos Aires, Argentina
| | - María C Sanmartin
- Laboratory of Molecular Oncology, Universidad Nacional de Quilmes, Buenos Aires, Argentina
| | - Daniel E Gomez
- Laboratory of Molecular Oncology, Universidad Nacional de Quilmes, Buenos Aires, Argentina
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44
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Histone Modifications and the Maintenance of Telomere Integrity. Cells 2019; 8:cells8020199. [PMID: 30823596 PMCID: PMC6407025 DOI: 10.3390/cells8020199] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2019] [Revised: 02/09/2019] [Accepted: 02/20/2019] [Indexed: 12/20/2022] Open
Abstract
Telomeres, the nucleoprotein structures at the ends of eukaryotic chromosomes, play an integral role in protecting linear DNA from degradation. Dysregulation of telomeres can result in genomic instability and has been implicated in increased rates of cellular senescence and many diseases, including cancer. The integrity of telomeres is maintained by a coordinated network of proteins and RNAs, such as the telomerase holoenzyme and protective proteins that prevent the recognition of the telomere ends as a DNA double-strand breaks. The structure of chromatin at telomeres and within adjacent subtelomeres has been implicated in telomere maintenance pathways in model systems and humans. Specific post-translational modifications of histones, including methylation, acetylation, and ubiquitination, have been shown to be necessary for maintaining a chromatin environment that promotes telomere integrity. Here we review the current knowledge regarding the role of histone modifications in maintaining telomeric and subtelomeric chromatin, discuss the implications of histone modification marks as they relate to human disease, and highlight key areas for future research.
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45
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Abstract
PURPOSE OF REVIEW Genomic mutations in telomere-related genes have been recognized as a cause of familial forms of idiopathic pulmonary fibrosis (IPF). However, it has become increasingly clear that telomere syndromes and telomere shortening are associated with various types of pulmonary disease. Additionally, it was found that also single nucleotide polymorphisms (SNPs) in telomere-related genes are risk factors for the development of pulmonary disease. This review focuses on recent updates on pulmonary phenotypes associated with genetic variation in telomere-related genes. RECENT FINDINGS Genomic mutations in seven telomere-related genes cause pulmonary disease. Pulmonary phenotypes associated with these mutations range from many forms of pulmonary fibrosis to emphysema and pulmonary vascular disease. Telomere-related mutations account for up to 10% of sporadic IPF, 25% of familial IPF, 10% of connective-tissue disease-associated interstitial lung disease, and 1% of COPD. Mixed disease forms have also been found. Furthermore, SNPs in TERT, TERC, OBFC1, and RTEL1, as well as short telomere length, have been associated with several pulmonary diseases. Treatment of pulmonary disease caused by telomere-related gene variation is currently based on disease diagnosis and not on the underlying cause. SUMMARY Pulmonary phenotypes found in carriers of telomere-related gene mutations and SNPs are primarily pulmonary fibrosis, sometimes emphysema and rarely pulmonary vascular disease. Genotype-phenotype relations are weak, suggesting that environmental factors and genetic background of patients determine disease phenotypes to a large degree. A disease model is presented wherever genomic variation in telomere-related genes cause specific pulmonary disease phenotypes whenever triggered by environmental exposure, comorbidity, or unknown factors.
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46
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Lai TP, Wright WE, Shay JW. Comparison of telomere length measurement methods. Philos Trans R Soc Lond B Biol Sci 2019; 373:rstb.2016.0451. [PMID: 29335378 DOI: 10.1098/rstb.2016.0451] [Citation(s) in RCA: 146] [Impact Index Per Article: 29.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/08/2017] [Indexed: 12/18/2022] Open
Abstract
The strengths and limitations of the major methods developed to measure telomere lengths (TLs) in cells and tissues are presented in this review. These include Q-PCR (Quantitative Polymerase Chain Reaction), TRF (Terminal Restriction Fragment) analysis, a variety of Q-FISH (Quantitative Fluorescence In Situ Hybridization) methods, STELA (Single TElomere Length Analysis) and TeSLA (Telomere Shortest Length Assay). For each method, we will cover information about validation studies, including reproducibility in independent laboratories, accuracy, reliability and sensitivity for measuring not only the average but also the shortest telomeres. There is substantial evidence that it is the shortest telomeres that trigger DNA damage responses leading to replicative senescence in mammals. However, the most commonly used TL measurement methods generally provide information on average or relative TL, but it is the shortest telomeres that leads to telomere dysfunction (identified by TIF, Telomere dysfunction Induced Foci) and limit cell proliferation in the absence of a telomere maintenance mechanism, such as telomerase. As the length of the shortest telomeres is a key biomarker determining cell fate and the onset of senescence, a new technique (TeSLA) that provides quantitative information about all the shortest telomeres will be highlighted.This article is part of the theme issue 'Understanding diversity in telomere dynamics'.
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Affiliation(s)
- Tsung-Po Lai
- Department of Cell Biology, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390, USA
| | - Woodring E Wright
- Department of Cell Biology, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390, USA
| | - Jerry W Shay
- Department of Cell Biology, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390, USA
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47
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Laberthonnière C, Magdinier F, Robin JD. Bring It to an End: Does Telomeres Size Matter? Cells 2019; 8:E30. [PMID: 30626097 PMCID: PMC6356554 DOI: 10.3390/cells8010030] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 01/01/2019] [Accepted: 01/04/2019] [Indexed: 12/22/2022] Open
Abstract
Telomeres are unique nucleoprotein structures. Found at the edge of each chromosome, their main purpose is to mask DNA ends from the DNA-repair machinery by formation of protective loops. Through life and cell divisions, telomeres shorten and bring cells closer to either cell proliferation crisis or senescence. Beyond this mitotic clock role attributed to the need for telomere to be maintained over a critical length, the very tip of our DNA has been shown to impact transcription by position effect. TPE and a long-reach counterpart, TPE-OLD, are mechanisms recently described in human biology. Still in infancy, the mechanism of action of these processes and their respective genome wide impact remain to be resolved. In this review, we will discuss recent findings on telomere dynamics, TPE, TPE-OLD, and lessons learnt from model organisms.
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Affiliation(s)
| | - Frédérique Magdinier
- Aix Marseille Univ, MMG, Marseille Medical Genetics U1251, 13385 Marseille, France.
| | - Jérôme D Robin
- Aix Marseille Univ, MMG, Marseille Medical Genetics U1251, 13385 Marseille, France.
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48
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NOVA1 directs PTBP1 to hTERT pre-mRNA and promotes telomerase activity in cancer cells. Oncogene 2018; 38:2937-2952. [PMID: 30568224 PMCID: PMC6474811 DOI: 10.1038/s41388-018-0639-8] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 10/24/2018] [Accepted: 12/04/2018] [Indexed: 11/09/2022]
Abstract
Alternative splicing is dysregulated in cancer cells, driving the production of isoforms that allow tumor cells to survive and continuously proliferate. Part of the reactivation of telomerase involves the splicing of hTERT transcripts to produce full-length (FL) TERT. Very few splicing factors to date have been described to interact with hTERT and promote the production of FL TERT. We recently described one such splicing factor, NOVA1, that acts as an enhancer of FL hTERT splicing, increases telomerase activity, and promotes telomere maintenance in cancer cells. NOVA1 is expressed primarily in neurons and is involved in neurogenesis. In the present studies, we describe that polypyrimidine-tract binding proteins (PTBPs), which are also typically involved in neurogenesis, are also participating in the splicing of hTERT to FL in cancer. Knockdown experiments of PTBP1 in cancer cells indicate that PTBP1 reduces hTERT FL splicing and telomerase activity. Stable knockdown of PTBP1 results in progressively shortened telomere length in H1299 and H920 lung cancer cells. RNA pulldown experiments reveal that PTBP1 interacts with hTERT pre-mRNA in a NOVA1 dependent fashion. Knockdown of PTBP1 increases the expression of PTBP2 which also interacts with NOVA1, potentially preventing the association of NOVA1 with hTERT pre-mRNA. These new data highlight that splicing in cancer cells is regulated by competition for splice sites and that combinations of splicing factors interact at cis regulatory sites on pre-mRNA transcripts. By employing hTERT as a model gene, we show the coordination of the splicing factors NOVA1 and PTBP1 in cancer by regulating telomerase that is expressed in the vast majority of cancer cell types.
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49
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Ivanyi-Nagy R, Ahmed SM, Peter S, Ramani PD, Ong PF, Dreesen O, Dröge P. The RNA interactome of human telomerase RNA reveals a coding-independent role for a histone mRNA in telomere homeostasis. eLife 2018; 7:40037. [PMID: 30355447 PMCID: PMC6249008 DOI: 10.7554/elife.40037] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Accepted: 10/24/2018] [Indexed: 12/26/2022] Open
Abstract
Telomerase RNA (TR) provides the template for DNA repeat synthesis at telomeres and is essential for genome stability in continuously dividing cells. We mapped the RNA interactome of human TR (hTR) and identified a set of non-coding and coding hTR-interacting RNAs, including the histone 1C mRNA (HIST1H1C). Disruption of the hTR-HIST1H1C RNA association resulted in markedly increased telomere elongation without affecting telomerase enzymatic activity. Conversely, over-expression of HIST1H1C led to telomere attrition. By using a combination of mutations to disentangle the effects of histone 1 RNA synthesis, protein expression, and hTR interaction, we show that HIST1H1C RNA negatively regulates telomere length independently of its protein coding potential. Taken together, our data provide important insights into a surprisingly complex hTR-RNA interaction network and define an unexpected non-coding RNA role for HIST1H1C in regulating telomere length homeostasis, thus offering a glimpse into the mostly uncharted, vast space of non-canonical messenger RNA functions.
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Affiliation(s)
- Roland Ivanyi-Nagy
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Syed Moiz Ahmed
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Sabrina Peter
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | | | - Peh Fern Ong
- Cell Ageing, Skin Research Institute Singapore, Singapore, Singapore
| | - Oliver Dreesen
- Cell Ageing, Skin Research Institute Singapore, Singapore, Singapore
| | - Peter Dröge
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore.,Nanyang Institute of Structural Biology, Nanyang Technological University, Singapore, Singapore
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50
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Jose SS, Tidu F, Burilova P, Kepak T, Bendickova K, Fric J. The Telomerase Complex Directly Controls Hematopoietic Stem Cell Differentiation and Senescence in an Induced Pluripotent Stem Cell Model of Telomeropathy. Front Genet 2018; 9:345. [PMID: 30210531 PMCID: PMC6123533 DOI: 10.3389/fgene.2018.00345] [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: 05/16/2018] [Accepted: 08/09/2018] [Indexed: 01/16/2023] Open
Abstract
Telomeropathies are rare disorders associated with impaired telomere length control mechanisms that frequently result from genetic mutations in the telomerase complex. Dyskeratosis congenita is a congenital progressive telomeropathy in which mutation in the telomerase RNA component (TERC) impairs telomere maintenance leading to accelerated cellular senescence and clinical outcomes resembling premature aging. The most severe clinical feature is perturbed hematopoiesis and bone-marrow failure, but the underlying mechanisms are not fully understood. Here, we developed a model of telomerase function imbalance using shRNA to knockdown TERC expression in human induced pluripotent stem cells (iPSCs). We then promoted in vitro hematopoiesis in these cells to analyze the effects of TERC impairment. Reduced TERC expression impaired hematopoietic stem-cell (HSC) differentiation and increased the expression of cellular senescence markers and production of reactive oxygen species. Interestingly, telomere length was unaffected in shTERC knockdown iPSCs, leading to conclusion that the phenotype is controlled by non-telomeric functions of telomerase. We then assessed the effects of TERC-depletion in THP-1 myeloid cells and again observed reduced hematopoietic and myelopoietic differentiative potential. However, these cells exhibited impaired telomerase activity as verified by accelerated telomere shortening. shTERC-depleted iPSC-derived and THP-1-derived myeloid precursors had lower phagocytic capacity and increased ROS production, indicative of senescence. These findings were confirmed using a BIBR1532 TERT inhibitor, suggesting that these phenotypes are dependent on telomerase function but not directly linked to telomere length. These data provide a better understanding of the molecular processes driving the clinical signs of telomeropathies and identify novel roles of the telomerase complex other than regulating telomere length.
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Affiliation(s)
- Shyam Sushama Jose
- Cellular and Molecular Immunoregulation Group, Center for Translational Medicine, International Clinical Research Center, St. Anne's University Hospital Brno, Brno, Czechia.,Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czechia
| | - Federico Tidu
- Cellular and Molecular Immunoregulation Group, Center for Translational Medicine, International Clinical Research Center, St. Anne's University Hospital Brno, Brno, Czechia.,Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czechia
| | - Petra Burilova
- Cellular and Molecular Immunoregulation Group, Center for Translational Medicine, International Clinical Research Center, St. Anne's University Hospital Brno, Brno, Czechia.,Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czechia
| | - Tomas Kepak
- Pediatric Oncology Translational Research, International Clinical Research Center, St. Anne's University Hospital Brno, Brno, Czechia.,Pediatric Hematology and Oncology, The University Hospital Brno, Brno, Czechia
| | - Kamila Bendickova
- Cellular and Molecular Immunoregulation Group, Center for Translational Medicine, International Clinical Research Center, St. Anne's University Hospital Brno, Brno, Czechia
| | - Jan Fric
- Cellular and Molecular Immunoregulation Group, Center for Translational Medicine, International Clinical Research Center, St. Anne's University Hospital Brno, Brno, Czechia
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