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Yang CY, Zheng HY, Abdelnour SA, Li LY, Shokrollahi B, Tang LP, Zhang Y, Huang JX, Shang JH. Molecular signatures of in vitro produced embryos derived from ovum pick up or slaughterhouse oocytes in buffalo. Theriogenology 2021; 169:14-20. [PMID: 33894668 DOI: 10.1016/j.theriogenology.2021.03.025] [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: 12/03/2020] [Revised: 03/29/2021] [Accepted: 03/30/2021] [Indexed: 10/21/2022]
Abstract
This study was performed to investigate the difference in developmental competence of oocytes derived from ovum pick-up (OPU) and slaughterhouse ovaries (SLH), and its underlying mechanisms. The OPU and SLH oocytes were in-vitro maturated and fertilized to produce blastocysts, and these blastoycsts were collected to explore the expression of key genes for developmental potential and telomere (Oct-4, Sox2, Nanog, Cdx2, Gata3, E-cadherin, β-catenin, TERT, TERF1 and TERF2). The results showed that both the cleavage and blastocyst rates were significantly higher for the OPU group (68.31%, 39.48%, respectively) than SLH group (57.59%, 26.50%, respectively) (P < 0.01). The relative mRNA abundances of Sox2, Oct-4, Nanog and E-cadherin were significantly higher in the OPU blastocysts than the SLH ones (P < 0.01). Protein expression analysis by Western blot and immunofluorescence also revealed that the expression of E-cadherin and Sox2 was significantly higher in OPU blastocysts than SLH ones. However, there was no significant differences between the two groups in the expression of Cdx2, β-catenin, Gata3, TERT, TERF1, TERF2. These results imply oocyte sources modify the expression of development and adhesion related genes in blastocysts, which may elucidate a possible reasoning for the low development competence of buffalo SLH embryos.
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Affiliation(s)
- Chun-Yan Yang
- Key Laboratory of Buffalo Genetics, Breeding and Reproduction Technology, Guangxi Buffalo Research Institute, Chinese Academy of Agricultural Sciences, Nanning, 530001, China; State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Animal Science and Technology, Guangxi University, Nanning, Guangxi, 530004, China
| | - Hai-Ying Zheng
- Key Laboratory of Buffalo Genetics, Breeding and Reproduction Technology, Guangxi Buffalo Research Institute, Chinese Academy of Agricultural Sciences, Nanning, 530001, China
| | - Sameh A Abdelnour
- Key Laboratory of Buffalo Genetics, Breeding and Reproduction Technology, Guangxi Buffalo Research Institute, Chinese Academy of Agricultural Sciences, Nanning, 530001, China; State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Animal Science and Technology, Guangxi University, Nanning, Guangxi, 530004, China; Animal Production Department, Faculty of Agriculture, Zagazig University, Zagazig, 44511, Egypt
| | - Ling-Yu Li
- Key Laboratory of Buffalo Genetics, Breeding and Reproduction Technology, Guangxi Buffalo Research Institute, Chinese Academy of Agricultural Sciences, Nanning, 530001, China
| | - Borhan Shokrollahi
- Key Laboratory of Buffalo Genetics, Breeding and Reproduction Technology, Guangxi Buffalo Research Institute, Chinese Academy of Agricultural Sciences, Nanning, 530001, China; Department of Animal Science, Faculty of Agriculture, Sanandaj Branch, Islamic Azad University, Sanandaj, Iran
| | - Li-Ping Tang
- Key Laboratory of Buffalo Genetics, Breeding and Reproduction Technology, Guangxi Buffalo Research Institute, Chinese Academy of Agricultural Sciences, Nanning, 530001, China
| | - Yu Zhang
- Key Laboratory of Buffalo Genetics, Breeding and Reproduction Technology, Guangxi Buffalo Research Institute, Chinese Academy of Agricultural Sciences, Nanning, 530001, China; College of Chemistry & Environment, Guangdong Ocean University, Zhanjiang, 524088, China
| | - Jia-Xiang Huang
- Key Laboratory of Buffalo Genetics, Breeding and Reproduction Technology, Guangxi Buffalo Research Institute, Chinese Academy of Agricultural Sciences, Nanning, 530001, China.
| | - Jiang-Hua Shang
- Key Laboratory of Buffalo Genetics, Breeding and Reproduction Technology, Guangxi Buffalo Research Institute, Chinese Academy of Agricultural Sciences, Nanning, 530001, China.
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AKT-dependent signaling of extracellular cues through telomeres impact on tumorigenesis. PLoS Genet 2021; 17:e1009410. [PMID: 33690611 PMCID: PMC7942993 DOI: 10.1371/journal.pgen.1009410] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Accepted: 02/09/2021] [Indexed: 12/27/2022] Open
Abstract
The telomere-bound shelterin complex is essential for chromosome-end protection and genomic stability. Little is known on the regulation of shelterin components by extracellular signals including developmental and environmental cues. Here, we show that human TRF1 is subjected to AKT-dependent regulation. To study the importance of this modification in vivo, we generate knock-in human cell lines carrying non-phosphorylatable mutants of the AKT-dependent TRF1 phosphorylation sites by CRISPR-Cas9. We find that TRF1 mutant cells show decreased TRF1 binding to telomeres and increased global and telomeric DNA damage. Human cells carrying non-phosphorylatable mutant TRF1 alleles show accelerated telomere shortening, demonstrating that AKT-dependent TRF1 phosphorylation regulates telomere maintenance in vivo. TRF1 mutant cells show an impaired response to proliferative extracellular signals as well as a decreased tumorigenesis potential. These findings indicate that telomere protection and telomere length can be regulated by extracellular signals upstream of PI3K/AKT activation, such as growth factors, nutrients or immune regulators, and this has an impact on tumorigenesis potential. We show how extracellular milieu information is transmitted to the nucleus through modifications in the telomeric protein TRF1. TRF1, a component of the shelterin complex that protects the ends of our chromosomes, is modified by the PI3K/AKT signaling pathway, which senses the extracellular nutritional conditions. We generated knock-in human cell lines carrying mutant TRF1 variants unable to be modified by AKT. TRF1 mutant cells show decreased TRF1 binding to telomeres, increased DNA damage and accelerated telomere shortening. TRF1 mutant cells show an impaired TRF1 stability in response to proliferative extracellular signals and a decreased tumorigenesis potential, demonstrating that telomere function and telomere length are regulated by extracellular signals upstream of PI3K/AKT activation.
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Ge J, Li C, Li C, Huang Z, Zeng J, Han L, Wang Q. SIRT6 participates in the quality control of aged oocytes via modulating telomere function. Aging (Albany NY) 2020; 11:1965-1976. [PMID: 30926765 PMCID: PMC6503879 DOI: 10.18632/aging.101885] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Accepted: 03/20/2019] [Indexed: 12/13/2022]
Abstract
It has been well recognized that oocyte quality declines in aging animals. However, to date, the underlying mechanism remains to be explored. In the present study, we report that oocytes and embryos from aged mice (42-45 weeks old) display the reduced expression of SIRT6 protein, accompanying with telomere shortening and DNA lesions. Moreover, we demonstrate that specific depletion of SIRT6 in oocytes induces dysfunctional telomeres and apoptosis of the resultant early embryos, leading to the developmental delay and cytoplasmic fragmentation. Importantly, we further find that overexpression of SIRT6 in aged oocytes promotes the telomere elongation in 2-cell embryos and lowers the incidence of apoptotic blastomeres. In summary, our data indicate a role for SIRT6 in modulating telomere function during oocyte maturation and embryonic development, and discover that SIRT6 reduction is an important point connecting maternal aging and quality control of oocyte/embryos.
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Affiliation(s)
- Juan Ge
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China
| | - Congyang Li
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China
| | - Chunling Li
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China
| | - Zhenyue Huang
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China
| | - Juan Zeng
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China
| | - Longsen Han
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China
| | - Qiang Wang
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China.,Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, China
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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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5
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Inoue H, Horiguchi M, Ono K, Kanoh J. Casein kinase 2 regulates telomere protein complex formation through Rap1 phosphorylation. Nucleic Acids Res 2020; 47:6871-6884. [PMID: 31131414 PMCID: PMC6648331 DOI: 10.1093/nar/gkz458] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2018] [Revised: 05/09/2019] [Accepted: 05/14/2019] [Indexed: 12/23/2022] Open
Abstract
Telomeres located at the ends of linear chromosomes play important roles in the maintenance of life. Rap1, a component of the shelterin telomere protein complex, interacts with multiple proteins to perform various functions; further, formation of shelterin requires Rap1 binding to other components such as Taz1 and Poz1, and telomere tethering to the nuclear envelope (NE) involves interactions between Rap1 and Bqt4, a nuclear membrane protein. Although Rap1 is a hub for telomere protein complexes, the regulatory mechanisms of its interactions with partner proteins are not fully understood. Here, we show that Rap1 is phosphorylated by casein kinase 2 (CK2) at multiple sites, which promotes interactions with Bqt4 and Poz1. Among the multiple CK2-mediated phosphorylation sites of Rap1, phosphorylation at Ser496 was found to be crucial for both Rap1–Bqt4 and Rap1–Poz1 interactions. These mechanisms mediate proper telomere tethering to the NE and the formation of the silenced chromatin structure at chromosome ends.
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Affiliation(s)
- Haruna Inoue
- Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
| | - Mayuri Horiguchi
- Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
| | - Kota Ono
- Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
| | - Junko Kanoh
- Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
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6
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Nelson ND, Dodson LM, Escudero L, Sukumar AT, Williams CL, Mihalek I, Baldan A, Baird DM, Bertuch AA. The C-Terminal Extension Unique to the Long Isoform of the Shelterin Component TIN2 Enhances Its Interaction with TRF2 in a Phosphorylation- and Dyskeratosis Congenita Cluster-Dependent Fashion. Mol Cell Biol 2018; 38:e00025-18. [PMID: 29581185 PMCID: PMC5974431 DOI: 10.1128/mcb.00025-18] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Accepted: 03/18/2018] [Indexed: 01/08/2023] Open
Abstract
TIN2 is central to the shelterin complex, linking the telomeric proteins TRF1 and TRF2 with TPP1/POT1. Mutations in TINF2, which encodes TIN2, that are found in dyskeratosis congenita (DC) result in very short telomeres and cluster in a region shared by the two TIN2 isoforms, TIN2S (short) and TIN2L (long). Here we show that TIN2L, but not TIN2S, is phosphorylated. TRF2 interacts more with TIN2L than TIN2S, and both the DC cluster and phosphorylation promote this enhanced interaction. The binding of TIN2L, but not TIN2S, is affected by TRF2-F120, which is also required for TRF2's interaction with end processing factors such as Apollo. Conversely, TRF1 interacts more with TIN2S than with TIN2L. A DC-associated mutation further reduces TIN2L-TRF1, but not TIN2S-TRF1, interaction. Cells overexpressing TIN2L or phosphomimetic TIN2L are permissive to telomere elongation, whereas cells overexpressing TIN2S or phosphodead TIN2L are not. Telomere lengths are unchanged in cell lines in which TIN2L expression has been eliminated by clustered regularly interspaced short palindromic repeat (CRISPR)/Cas9-mediated mutation. These results indicate that TIN2 isoforms are biochemically and functionally distinguishable and that shelterin composition could be fundamentally altered in patients with TINF2 mutations.
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Affiliation(s)
- Nya D Nelson
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, USA
- Division of Hematology/Oncology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Lois M Dodson
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, USA
- Division of Hematology/Oncology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Laura Escudero
- Division of Cancer and Genetics, School of Medicine, Cardiff University, Cardiff, United Kingdom
| | - Ann T Sukumar
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, USA
- Division of Hematology/Oncology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Christopher L Williams
- Division of Hematology/Oncology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Ivana Mihalek
- Bioinformatics Institute, Agency for Science Technology and Research, Singapore, Singapore
| | - Alessandro Baldan
- Division of Hematology/Oncology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Duncan M Baird
- Division of Cancer and Genetics, School of Medicine, Cardiff University, Cardiff, United Kingdom
| | - Alison A Bertuch
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, USA
- Division of Hematology/Oncology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
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7
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Perea SE, Baladrón I, Valenzuela C, Perera Y. CIGB-300: A peptide-based drug that impairs the Protein Kinase CK2-mediated phosphorylation. Semin Oncol 2018; 45:58-67. [PMID: 30318085 DOI: 10.1053/j.seminoncol.2018.04.006] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Accepted: 04/20/2018] [Indexed: 01/09/2023]
Abstract
Protein kinase CK2, formerly referred to as casein kinase II, is a serine/threonine kinase often found overexpressed in solid tumors and hematologic malignancies that phosphorylates many substrates integral to the hallmarks of cancer. CK2 has emerged as a viable oncology target having been experimentally validated with different kinase inhibitors, including small molecule ATP-competitors, synthetic peptides, and antisense oligonucleotides. To date only two CK2 inhibitors, CIGB-300 and CX-4945, have entered the clinic in phase 1-2 trials. This review provides information on CIGB-300, a cell-permeable cyclic peptide that inhibits CK2-mediated phosphorylation by targeting the substrate phosphoacceptor domain. We review data that support the concept of CK2 as an anticancer target, address the mechanism of action, and summarize preclinical studies showing antiangiogenic and antimetastatic effects as well as synergism with anticancer drugs in preclinical models. We also summarize early clinical research (phase 1/2 trials) of CIGB-300 in cervical cancer, including data in combination with chemoradiotherapy. The clinical data demonstrate the safety, tolerability, and clinical effects of intratumoral injections of CIGB-300 and provide the foundation for future phase 3 clinical trials in locally advanced cervical cancer in combination with standard chemoradiotherapy.
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Affiliation(s)
- Silvio E Perea
- Molecular Oncology Laboratory, Biomedical Research Area, Center for Genetic Engineering and Biotechnology, Havana, Cuba.
| | - Idania Baladrón
- Clinical Research Division, Center for Genetic Engineering and Biotechnology, Havana, Cuba
| | - Carmen Valenzuela
- Clinical Research Division, Center for Genetic Engineering and Biotechnology, Havana, Cuba
| | - Yasser Perera
- Molecular Oncology Laboratory, Biomedical Research Area, Center for Genetic Engineering and Biotechnology, Havana, Cuba
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8
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Méndez-Pertuz M, Martínez P, Blanco-Aparicio C, Gómez-Casero E, Belen García A, Martínez-Torrecuadrada J, Palafox M, Cortés J, Serra V, Pastor J, Blasco MA. Modulation of telomere protection by the PI3K/AKT pathway. Nat Commun 2017; 8:1278. [PMID: 29097657 PMCID: PMC5668434 DOI: 10.1038/s41467-017-01329-2] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Accepted: 09/11/2017] [Indexed: 11/23/2022] Open
Abstract
Telomeres and the insulin/PI3K pathway are considered hallmarks of aging and cancer. Here, we describe a role for PI3K/AKT in the regulation of TRF1, an essential component of the shelterin complex. PI3K and AKT chemical inhibitors reduce TRF1 telomeric foci and lead to increased telomeric DNA damage and fragility. We identify the PI3Kα isoform as responsible for this TRF1 inhibition. TRF1 is phosphorylated at different residues by AKT and these modifications regulate TRF1 protein stability and TRF1 binding to telomeric DNA in vitro and are important for in vivo TRF1 telomere location and cell viability. Patient-derived breast cancer PDX mouse models that effectively respond to a PI3Kα specific inhibitor, BYL719, show decreased TRF1 levels and increased DNA damage. These findings functionally connect two of the major pathways for cancer and aging, telomeres and the PI3K pathway, and pinpoint PI3K and AKT as novel targets for chemical modulation of telomere protection. Regulation of telomeres and the insulin/PI3K pathway both have roles in aging and cancer development but have not been functionally linked. Here the authors demonstrate that PI3K, via downstream targets, regulates TRF1 via phosphorylation.
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Affiliation(s)
- Marinela Méndez-Pertuz
- Telomeres and Telomerase Group, Molecular Oncology Program, Spanish National Cancer Centre (CNIO), Melchor Fernández Almagro 3, Madrid, E-28029, Spain
| | - Paula Martínez
- Telomeres and Telomerase Group, Molecular Oncology Program, Spanish National Cancer Centre (CNIO), Melchor Fernández Almagro 3, Madrid, E-28029, Spain
| | - Carmen Blanco-Aparicio
- Experimental Therapeutics Program, Spanish National Cancer Centre (CNIO), Melchor Fernández Almagro 3, Madrid, E-28029, Spain
| | - Elena Gómez-Casero
- Experimental Therapeutics Program, Spanish National Cancer Centre (CNIO), Melchor Fernández Almagro 3, Madrid, E-28029, Spain
| | - Ana Belen García
- Experimental Therapeutics Program, Spanish National Cancer Centre (CNIO), Melchor Fernández Almagro 3, Madrid, E-28029, Spain
| | - Jorge Martínez-Torrecuadrada
- Biotechnology Program, Spanish National Cancer Centre (CNIO), Melchor Fernández Almagro 3, Madrid, E-28029, Spain
| | - Marta Palafox
- Experimental Therapeutics Group, Vall d´Hebron Institute of Oncology (VHIO), Natzaret 115-117, Barcelona, E-08035, Spain
| | - Javier Cortés
- Experimental Therapeutics Group, Vall d´Hebron Institute of Oncology (VHIO), Natzaret 115-117, Barcelona, E-08035, Spain
| | - Violeta Serra
- Experimental Therapeutics Group, Vall d´Hebron Institute of Oncology (VHIO), Natzaret 115-117, Barcelona, E-08035, Spain
| | - Joaquin Pastor
- Experimental Therapeutics Program, Spanish National Cancer Centre (CNIO), Melchor Fernández Almagro 3, Madrid, E-28029, Spain
| | - Maria A Blasco
- Telomeres and Telomerase Group, Molecular Oncology Program, Spanish National Cancer Centre (CNIO), Melchor Fernández Almagro 3, Madrid, E-28029, Spain.
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9
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MacNeil DE, Bensoussan HJ, Autexier C. Telomerase Regulation from Beginning to the End. Genes (Basel) 2016; 7:genes7090064. [PMID: 27649246 PMCID: PMC5042394 DOI: 10.3390/genes7090064] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Revised: 08/25/2016] [Accepted: 08/26/2016] [Indexed: 12/11/2022] Open
Abstract
The vast body of literature regarding human telomere maintenance is a true testament to the importance of understanding telomere regulation in both normal and diseased states. In this review, our goal was simple: tell the telomerase story from the biogenesis of its parts to its maturity as a complex and function at its site of action, emphasizing new developments and how they contribute to the foundational knowledge of telomerase and telomere biology.
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Affiliation(s)
- Deanna Elise MacNeil
- Bloomfield Centre for Research in Aging, Lady Davis Institute for Medical Research, Jewish General Hospital, 3755 Côte Ste-Catherine Road, Montréal, QC H3T 1E2, Canada.
- Room M-29, Department of Anatomy and Cell Biology, McGill University, 3640 University Street, Montréal, QC H3A 0C7, Canada.
| | - Hélène Jeanne Bensoussan
- Bloomfield Centre for Research in Aging, Lady Davis Institute for Medical Research, Jewish General Hospital, 3755 Côte Ste-Catherine Road, Montréal, QC H3T 1E2, Canada.
- Room M-29, Department of Anatomy and Cell Biology, McGill University, 3640 University Street, Montréal, QC H3A 0C7, Canada.
| | - Chantal Autexier
- Bloomfield Centre for Research in Aging, Lady Davis Institute for Medical Research, Jewish General Hospital, 3755 Côte Ste-Catherine Road, Montréal, QC H3T 1E2, Canada.
- Room M-29, Department of Anatomy and Cell Biology, McGill University, 3640 University Street, Montréal, QC H3A 0C7, Canada.
- Department of Experimental Medicine, McGill University, 1110 Pins Avenue West, Room 101, Montréal, QC H3A 1A3, Canada.
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10
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Jeong YY, Her J, Chung IK. NEDD8 ultimate buster-1 regulates the abundance of TRF1 at telomeres by promoting its proteasomal degradation. FEBS Lett 2016; 590:1776-90. [PMID: 27214791 DOI: 10.1002/1873-3468.12221] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Revised: 04/13/2016] [Accepted: 04/27/2016] [Indexed: 01/28/2023]
Abstract
The human telomeric protein TRF1 negatively regulates telomere length by inhibiting the access of telomerase to telomeres. Here, we describe a novel function of NEDD8 ultimate buster-1 (NUB1) for regulating the levels of TRF1 at telomeres. NUB1 is a NEDD8-interacting protein, which down-regulates the NEDD8 conjugation system. We showed that NUB1 physically interacts with TRF1 and promotes its degradation by the proteasome in the absence of NEDD8 conjugation. We also demonstrated that TRF1 is conjugated to NEDD8, and that neddylated TRF1 is targeted to the proteasome for degradation in a NUB1-dependent manner. These data suggest that NUB1 participates in telomere maintenance by regulating the levels of TRF1 at telomeres through both NEDD8-dependent and NEDD8-independent pathways.
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Affiliation(s)
- Yu Young Jeong
- Department of Integrated Omics for Biomedical Science, Yonsei University, Seoul, Korea
| | - Joonyoung Her
- Department of Integrated Omics for Biomedical Science, Yonsei University, Seoul, Korea
| | - In Kwon Chung
- Department of Integrated Omics for Biomedical Science, Yonsei University, Seoul, Korea.,Department of Systems Biology, College of Life Science and Biotechnology, Yonsei University, Seoul, Korea
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11
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Lee K, Gollahon LS. ZSCAN4 and TRF1: A functionally indirect interaction in cancer cells independent of telomerase activity. Biochem Biophys Res Commun 2015; 466:644-9. [PMID: 26403970 DOI: 10.1016/j.bbrc.2015.09.107] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Accepted: 09/19/2015] [Indexed: 10/23/2022]
Abstract
PURPOSE Recently, the newly identified embryonic stem cell marker, Zinc finger and SCAN domain containing 4 gene (ZSCAN4), which plays a key role in genomic stability by regulating telomere elongation, was shown to co-localize with TRF1 foci. This suggests that the interaction of ZSCAN4 with TRF1 functions in regulation of telomere elongation in ESC. Based on these studies, we hypothesized that ZSCAN4 binds to TRF1 in cancer cells to function in regulating telomere length. The purpose of this study was to determine whether this interaction occurred across different cell lineage-derived cancers and whether telomerase status impacted this relationship. To that end, telomerase positive cervical cancer cells (HeLa) and breast cancer cells (MCF7), and telomerase negative osteosarcoma cells (SaOS2), were analyzed for ZSCAN4 and TRF1 interactions. RESULTS Immunocytochemistry demonstrated co-localization of ZSCAN4 and TRF1 to the nucleus. This functional relationship was confirmed using BiFC imaging analysis based on distance in situ. Co-immunoprecipitation and pull-down assay results demonstrated that ZSCAN4 binds with TRF1 in vitro indirectly. All three cell types showed similar results. CONCLUSIONS In this study, we revealed, for the first time, that ZSCAN4 indirectly interacts with TRF1 (functional association protein) in cancer cells. Furthermore, we show that ZSCAN4 plays an important role independent of telomere maintenance pathways (telomerase positive and ALT) or cell lineage.
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Affiliation(s)
- Kyungwoo Lee
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409, USA.
| | - Lauren S Gollahon
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409, USA; Texas Tech University Imaging Center, Lubbock, TX, 79409, USA.
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12
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13
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Saxena R, Bjonnes A, Prescott J, Dib P, Natt P, Lane J, Lerner M, Cooper JA, Ye Y, Li KW, Maubaret CG, Codd V, Brackett D, Mirabello L, Kraft P, Dinney CP, Stowell D, Peyton M, Ralhan S, Wander GS, Mehra NK, Salpea KD, Gu J, Wu X, Mangino M, Hunter DJ, De Vivo I, Humphries SE, Samani NJ, Spector TD, Savage SA, Sanghera DK. Genome-wide association study identifies variants in casein kinase II (CSNK2A2) to be associated with leukocyte telomere length in a Punjabi Sikh diabetic cohort. ACTA ACUST UNITED AC 2014; 7:287-95. [PMID: 24795349 DOI: 10.1161/circgenetics.113.000412] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
BACKGROUND Telomere length is a heritable trait, and short telomere length has been associated with multiple chronic diseases. We investigated the relationship of relative leukocyte telomere length with cardiometabolic risk and performed the first genome-wide association study and meta-analysis to identify variants influencing relative telomere length in a population of Sikhs from South Asia. METHODS AND RESULTS Our results revealed a significant independent association of shorter relative telomere length with type 2 diabetes mellitus and heart disease. Our discovery genome-wide association study (n=1616) was followed by stage 1 replication of 25 top signals (P<10(-6)) in an additional Sikhs (n=2397). On combined discovery and stage 1 meta-analysis (n= 4013), we identified a novel relative telomere length locus at chromosome 16q21 represented by an intronic variant (rs74019828) in the CSNK2A2 gene (β=-0.38; P=4.5×10(-8)). We further tested 3 top variants by genotyping in UK cardiovascular disease (UKCVD) (whites n=2952) for stage 2. Next, we performed in silico replication of 139 top signals (P<10(-5)) in UK Twin, Nurses Heart Study, Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial, and MD Anderson Cancer Controls (n=10 033) and joint meta-analysis (n=16 998). The observed signal in CSNK2A2 was confined to South Asians and could not be replicated in whites because of significant difference in allele frequencies (P<0.001). CSNK2A2 phosphorylates telomeric repeat binding factor 1 and plays an important role for regulation of telomere length homoeostasis. CONCLUSIONS By identification of a novel signal in telomere pathway genes, our study provides new molecular insight into the underlying mechanism that may regulate telomere length and its association with human aging and cardiometabolic pathophysiology.
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14
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Yoo JE, Park YN, Oh BK. PinX1, a telomere repeat-binding factor 1 (TRF1)-interacting protein, maintains telomere integrity by modulating TRF1 homeostasis, the process in which human telomerase reverse Transcriptase (hTERT) plays dual roles. J Biol Chem 2014; 289:6886-6898. [PMID: 24415760 DOI: 10.1074/jbc.m113.506006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
TRF1, a telomere-binding protein, is important for telomere protection and homeostasis. PinX1 interacts with TRF1, but the physiological consequences of their interaction in telomere protection are not yet understood. Here we investigated PinX1 function on TRF1 stability in HeLa cells. PinX1 overexpression stabilized TRF1, but PinX1 depletion by siRNA led to TRF1 degradation, TRF1 ubiquitination, and less TRF1 telomere association. The depletion also induced DNA damage responses at telomeres and chromosome instability. These telomere dysfunctional phenotypes were in fact due to TRF1 deficiency. We also report that hTERT, a catalytic component of telomerase, plays dual roles in the TRF1 steady state pathway. PinX1-mediated TRF1 stability was not observed in hTERT-negative immortal cells, but was pronounced when hTERT was ectopically expressed in the cells, suggesting that hTERT may be needed in the PinX1-mediated TRF1 stability pathway. Interestingly, the knockdown of both PinX1 and hTERT in HeLa cells stabilized TRF1, suppressed DNA damage response activation, and restored chromosome stability. In summary, our findings suggested that PinX1 may maintain telomere integrity by regulating TRF1 stability and that hTERT may act as both a positive and a negative regulator of TRF1 homeostasis in a PinX1-dependent manner.
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Affiliation(s)
- Jeong Eun Yoo
- Department of Pathology, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, 250 Seongsan-ro, Seodaemoon-gu, Seoul 120-752, Korea
| | - Young Nyun Park
- Department of Pathology, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, 250 Seongsan-ro, Seodaemoon-gu, Seoul 120-752, Korea; Severance Biomedical Science Institute, Yonsei University College of Medicine, 250 Seongsan-ro, Seodaemoon-gu, Seoul 120-752, Korea.
| | - Bong-Kyeong Oh
- Department of Obstetrics and Gynecology, Institute of Medical Science, Hanyang University College of Medicine, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, Korea.
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15
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Kim J, Chung IK. The splicing factor U2AF65 stabilizes TRF1 protein by inhibiting its ubiquitin-dependent proteolysis. Biochem Biophys Res Commun 2013; 443:1124-30. [PMID: 24389012 DOI: 10.1016/j.bbrc.2013.12.118] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2013] [Accepted: 12/23/2013] [Indexed: 11/30/2022]
Abstract
The human telomeric protein TRF1 is a component of the six-subunit protein complex shelterin, which provides telomere protection by organizing the telomere into a high-order structure. TRF1 functions as a negative regulator of telomere length by controlling the access of telomerase to telomeres. Thus, the cellular abundance of TRF1 at telomeres should be maintained and tightly regulated to ensure proper telomere function. Here, we identify U2 small nuclear ribonucleoprotein (snRNP) auxiliary factor 65 (U2AF65), an essentialpre-mRNA splicingfactor, as a novel TRF1-interacting protein. U2AF65 interacts with TRF1 in vitro and in vivo and is capable of stabilizing TRF1 protein by inhibiting its ubiquitin-dependent proteolysis. We also found that U2AF65 interferes with the interaction between TRF1 and Fbx4, an E3 ubiquitin ligase for TRF1. Depletion of endogenous U2AF65 expression by short interfering RNA (siRNA) reduced the stability of endogenous TRF1 whereas overexpression of U2AF65 significantly extended the half-life of TRF1. These findings demonstrate that U2AF65 plays a critical role in regulating the level of TRF1 through physical interaction and ubiquitin-mediated proteolysis. Hence, U2AF65 represents a new route for modulating TRF1 function at telomeres.
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Affiliation(s)
- Jeonghee Kim
- Departments of Systems Biology and Integrated Omics for Biomedical Science, Yonsei University, Seoul 120-749, Republic of Korea
| | - In Kwon Chung
- Departments of Systems Biology and Integrated Omics for Biomedical Science, Yonsei University, Seoul 120-749, Republic of Korea.
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16
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Ozturk S, Sozen B, Demir N. Telomere length and telomerase activity during oocyte maturation and early embryo development in mammalian species. Mol Hum Reprod 2013; 20:15-30. [DOI: 10.1093/molehr/gat055] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
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17
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Galati A, Micheli E, Cacchione S. Chromatin structure in telomere dynamics. Front Oncol 2013; 3:46. [PMID: 23471416 PMCID: PMC3590461 DOI: 10.3389/fonc.2013.00046] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2012] [Accepted: 02/21/2013] [Indexed: 11/13/2022] Open
Abstract
The establishment of a specific nucleoprotein structure, the telomere, is required to ensure the protection of chromosome ends from being recognized as DNA damage sites. Telomere shortening below a critical length triggers a DNA damage response that leads to replicative senescence. In normal human somatic cells, characterized by telomere shortening with each cell division, telomere uncapping is a regulated process associated with cell turnover. Nevertheless, telomere dysfunction has also been associated with genomic instability, cell transformation, and cancer. Despite the essential role telomeres play in chromosome protection and in tumorigenesis, our knowledge of the chromatin structure involved in telomere maintenance is still limited. Here we review the recent findings on chromatin modifications associated with the dynamic changes of telomeres from protected to deprotected state and their role in telomere functions.
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Affiliation(s)
- Alessandra Galati
- Dipartimento di Biologia e Biotecnologie, Istituto Pasteur - Fondazione Cenci Bolognetti, Sapienza Università di Roma Rome, Italy
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18
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Her YR, Chung IK. p300-mediated acetylation of TRF2 is required for maintaining functional telomeres. Nucleic Acids Res 2013; 41:2267-83. [PMID: 23307557 PMCID: PMC3575801 DOI: 10.1093/nar/gks1354] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The human telomeric protein TRF2 is required to protect chromosome ends by facilitating their organization into the protective capping structure. Post-translational modifications of TRF2 such as phosphorylation, ubiquitination, SUMOylation, methylation and poly(ADP-ribosyl)ation have been shown to play important roles in telomere function. Here we show that TRF2 specifically interacts with the histone acetyltransferase p300, and that p300 acetylates the lysine residue at position 293 of TRF2. We also report that p300-mediated acetylation stabilizes the TRF2 protein by inhibiting its ubiquitin-dependent proteolysis and is required for efficient telomere binding of TRF2. Furthermore, overexpression of the acetylation-deficient mutant, K293R, induces DNA-damage response foci at telomeres, thereby leading to induction of impaired cell growth, cellular senescence and altered cell cycle distribution. A small but significant number of metaphase chromosomes show no telomeric signals at chromatid ends, suggesting an aberrant telomere structure. These findings demonstrate that acetylation of TRF2 by p300 plays a crucial role in the maintenance of functional telomeres as well as in the regulation of the telomere-associated DNA-damage response, thus providing a new route for modulating telomere protection function.
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Affiliation(s)
- Yoon Ra Her
- Departments of Systems Biology and Integrated Omics for Biomedical Science, WCU Program of Graduate School, Yonsei University, Seoul 120-749, Korea
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19
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Walker JR, Zhu XD. Post-translational modifications of TRF1 and TRF2 and their roles in telomere maintenance. Mech Ageing Dev 2012; 133:421-34. [PMID: 22634377 DOI: 10.1016/j.mad.2012.05.002] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2012] [Revised: 04/27/2012] [Accepted: 05/04/2012] [Indexed: 11/29/2022]
Abstract
Telomeres, heterochromatic structures, found at the ends of linear eukaryotic chromosomes, function to protect natural chromosome ends from nucleolytic attack. Human telomeric DNA is bound by a telomere-specific six-subunit protein complex, termed shelterin/telosome. The shelterin subunits TRF1 and TRF2 bind in a sequence-specific manner to double-stranded telomeric DNA, providing a vital platform for recruitment of additional shelterin proteins as well as non-shelterin factors crucial for the maintenance of telomere length and structure. Both TRF1 and TRF2 are engaged in multiple roles at telomeres including telomere protection, telomere replication, sister telomere resolution and telomere length maintenance. Regulation of TRF1 and TRF2 in these various processes is controlled by post-translational modifications, at times in a cell-cycle-dependent manner, affecting key functions such as DNA binding, dimerization, localization, degradation and interactions with other proteins. Here we review the post-translational modifications of TRF1 and TRF2 and discuss the mechanisms by which these modifications contribute to the function of these two proteins.
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Affiliation(s)
- John R Walker
- Department of Biology, LSB438, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4K1, Canada
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20
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Peuscher MH, Jacobs JJL. Posttranslational control of telomere maintenance and the telomere damage response. Cell Cycle 2012; 11:1524-34. [PMID: 22433952 DOI: 10.4161/cc.19847] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Telomeres help maintain genome integrity by protecting natural chromosome ends from being recognized as damaged DNA. When telomeres become dysfunctional, they limit replicative lifespan and prevent outgrowth of potentially cancerous cells by activating a DNA damage response that forces cells into senescence or apoptosis. On the other hand, chromosome ends devoid of proper telomere protection are subject to DNA repair activities that cause end-to-end fusions and, when cells divide, extensive genomic instability that can promote cancer. While telomeres represent unique chromatin structures with important roles in cancer and aging, we have limited understanding of the way telomeres and the response to their malfunction are controlled at the level of chromatin. Accumulating evidence indicates that different types of posttranslational modifications act in both telomere maintenance and the response to telomere uncapping. Here, we discuss the latest insights on posttranslational control of telomeric chromatin, with emphasis on ubiquitylation and SUMOylation events.
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Affiliation(s)
- Marieke H Peuscher
- Division of Molecular Oncology, The Netherlands Cancer Institute, Amsterdam, The Netherlands
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21
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McKerlie M, Lin S, Zhu XD. ATM regulates proteasome-dependent subnuclear localization of TRF1, which is important for telomere maintenance. Nucleic Acids Res 2012; 40:3975-89. [PMID: 22266654 PMCID: PMC3351164 DOI: 10.1093/nar/gks035] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Ataxia telangiectasia mutated (ATM), a PI-3 kinase essential for maintaining genomic stability, has been shown to regulate TRF1, a negative mediator of telomerase-dependent telomere extension. However, little is known about ATM-mediated TRF1 phosphorylation site(s) in vivo. Here, we report that ATM phosphorylates S367 of TRF1 and that this phosphorylation renders TRF1 free of chromatin. We show that phosphorylated (pS367)TRF1 forms distinct non-telomeric subnuclear foci and that these foci occur predominantly in S and G2 phases, implying that their formation is cell cycle regulated. We show that phosphorylated (pS367)TRF1-containing foci are sensitive to proteasome inhibition. We find that a phosphomimic mutation of S367D abrogates TRF1 binding to telomeric DNA and renders TRF1 susceptible to protein degradation. In addition, we demonstrate that overexpressed TRF1-S367D accumulates in the subnuclear domains containing phosphorylated (pS367)TRF1 and that these subnuclear domains overlap with nuclear proteasome centers. Taken together, these results suggest that phosphorylated (pS367)TRF1-containing foci may represent nuclear sites for TRF1 proteolysis. Furthermore, we show that TRF1 carrying the S367D mutation is unable to inhibit telomerase-dependent telomere lengthening or to suppress the formation of telomere doublets and telomere loss in TRF1-depleted cells, suggesting that S367 phosphorylation by ATM is important for the regulation of telomere length and stability.
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Affiliation(s)
- Megan McKerlie
- Department of Biology, McMaster University, 1280 Main St. West, Hamilton, ON L8S4K1, Canada
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22
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Abstract
Telomeres are coated by shelterin, a six-subunit complex that is required for protection and replication of chromosome ends. The central subunit TIN2, with binding sites to three subunits (TRF1, TRF2, and TPP1), is essential for stability and function of the complex. Here we show that TIN2 stability is regulated by the E3 ligase Siah2. We demonstrate that TIN2 binds to Siah2 and is ubiquitylated in vivo. We show using purified proteins that Siah2 acts as an E3 ligase to directly ubiquitylate TIN2 in vitro. Depletion of Siah2 led to stabilization of TIN2 protein, indicating that Siah2 regulates TIN2 protein levels in vivo. Overexpression of Siah2 in human cells led to loss of TIN2 at telomeres that was dependent on the presence of the catalytic RING domain of Siah2. In contrast to RNAi-mediated depletion of TIN2 that led to loss of TRF1 and TRF2 at telomeres, Siah2-mediated depletion of TIN2 allowed TRF1 and TRF2 to remain on telomeres, indicating a different fate for shelterin subunits when TIN2 is depleted posttranslationally. TPP1 was lost from telomeres, although its protein level was not reduced. We speculate that Siah2-mediated removal of TIN2 may allow dynamic remodeling of the shelterin complex and its associated factors during the cell cycle.
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Meng L, Hsu JK, Zhu Q, Lin T, Tsai RYL. Nucleostemin inhibits TRF1 dimerization and shortens its dynamic association with the telomere. J Cell Sci 2011; 124:3706-14. [PMID: 22045740 DOI: 10.1242/jcs.089672] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
TRF1 is a key component of the telomere-capping complex and binds double-strand telomeric DNA as homodimers. So far, it is not clear whether TRF1 dimerization coincides with its telomere binding or is actively controlled before it binds the telomere, and in the latter case, how this event might affect its telomere association. We previously found that TRF1 dimerization and its telomere binding can be increased by GNL3L, which is the vertebrate paralogue of nucleostemin (NS). Here, we show that NS and GNL3L bind TRF1 directly but competitively through two separate domains of TRF1. In contrast to GNL3L, NS prevents TRF1 dimerization through a mechanism not determined by its ability to displace TRF1-bound GNL3L. Furthermore, NS is capable of shortening the dynamic association of TRF1 with the telomere in normal and TRF2(ΔBΔM)-induced telomere-damaged cells without affecting the amount of telomere-bound TRF1 proteins in vivo. Importantly, NS displays a protective function against the formation of telomere-dysfunction-induced foci. This work demonstrates that TRF1 dimerization is actively and oppositely regulated by NS and GNL3L extrachromosomally. Changing the relative amount of TRF1 monomers versus dimers in the nucleoplasm might affect the dynamic association of TRF1 with the telomere and the repair of damaged telomeres.
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Affiliation(s)
- Lingjun Meng
- Institute of Biosciences and Technology, Texas A&M Health Science Center, Houston, Texas 77030, USA
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24
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Abstract
The linear nature of eukaryotic chromosomes necessitates protection of their physical ends, the telomeres, because the DNA-repair machinery can misconstrue the ends as double-stranded DNA breaks. Thus, protection is crucial for avoiding an unwarranted DNA-damage response that could have catastrophic ramifications for the integrity and stability of the linear genome. In this Commentary, we attempt to define what is currently understood by the term ;telomere protection'. Delineating the defining boundaries of chromosome-end protection is important now more than ever, as it is becoming increasingly evident that, although unwanted DNA repair at telomeres must be avoided at all costs, the molecular players involved in recognition, signaling and repair of DNA damage might also serve to protect telomeres.
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Affiliation(s)
- Liana Oganesian
- The Salk Institute for Biological Studies, Molecular and Cellular Biology Department, La Jolla, CA 92037, USA
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25
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Aguennouz M, Vita GL, Messina S, Cama A, Lanzano N, Ciranni A, Rodolico C, Di Giorgio RM, Vita G. Telomere shortening is associated to TRF1 and PARP1 overexpression in Duchenne muscular dystrophy. Neurobiol Aging 2010; 32:2190-7. [PMID: 20137830 DOI: 10.1016/j.neurobiolaging.2010.01.008] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2009] [Revised: 10/30/2009] [Accepted: 01/14/2010] [Indexed: 01/09/2023]
Abstract
Telomere shortening is thought to contribute to premature senescence of satellite cells in Duchenne muscular dystrophy (DMD) muscle. Telomeric repeat binding factor-1 (TRF1) and poly (ADP-ribose) polymerase-1 (PARP1) are proteins known to modulate telomerase reverse transcriptase (TERT) activity, which controls telomere elongation. Here we show that an age-dependent telomere shortening occurs in DMD muscles and is associated to overexpression of mRNA and protein levels of TRF1 and PARP1. TERT expression and activity are detectable in normal control muscles and they slightly increase in DMD. This is the first demonstration of TRF1 and PARP1 overexpression in DMD muscles. They can be directly involved in replicative senescence of satellite cells and/or in the pathogenetic cascade through a cross-talk with oxidative stress and inflammatory response. Modulation of these events by TRF1 or PARP1 inhibition might represent a novel strategy for treatment of DMD and other muscular dystrophies.
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Affiliation(s)
- M'Hammed Aguennouz
- Department of Neurosciences, Psychiatry and Anaesthesiology, University of Messina, AOU Policlinico, Messina 98125, Italy
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26
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Okamoto K, Shinkai Y. TRFH domain is critical for TRF1-mediated telomere stabilization. Cell Struct Funct 2009; 34:71-6. [PMID: 19521025 DOI: 10.1247/csf.09007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
The telomeres are nucleoprotein complexes essential for maintaining the genomic integrity of linear chromosomes. Six telomere localizing proteins form a complex named "shelterin/telosome" to cooperatively regulate telomere length and protect chromosomal ends from DNA damage and repair responses. Mouse embryonic stem (ES) cells lacking TRF1, a shelterin component, exhibit a high-incidence of broken or lost telomere FISH signals, supporting a critical role for TRF1 in telomere maintenance. We demonstrate that these abnormal telomere structures are not caused by the inability of TRF1-deficient cells to recruit TIN2 but are due to a specific role for TRF1 at telomeres. Furthermore, we provide evidence that the mTRF1 TRF homology (TRFH) domain is crucial for this abnormal telomere FISH phenotype. These novel findings suggest that the TRFH domain is crucial not only for dimerization of TRF1 and TIN2-telomere recruitment, but also telomere stabilization.
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Affiliation(s)
- Keiji Okamoto
- Experimental Research Center for Infectious Diseases, Institute for Virus Research, Kyoto University, Japan
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27
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Yoo JE, Oh BK, Park YN. Human PinX1 mediates TRF1 accumulation in nucleolus and enhances TRF1 binding to telomeres. J Mol Biol 2009; 388:928-40. [PMID: 19265708 DOI: 10.1016/j.jmb.2009.02.051] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2008] [Revised: 01/30/2009] [Accepted: 02/13/2009] [Indexed: 10/21/2022]
Abstract
Human PinX1 (hPinX1) is known to interact with telomere repeat binding factor 1 (TRF1) and telomerase. Here, we report that hPinX1 regulates the nucleolar accumulation and telomeric association of TRF1. In HeLa, HA-hPinX1 was co-localized with fibrillarin, a nucleolar protein, in 51% of the transfected cells and was present in the nucleoplasm of the remaining 48%. Mutant analysis showed that the C-terminal region was important for nucleolar localization, while the N-terminus exhibited an inhibitory effect on nucleolar localization. Unlike HA- and Myc-hPinX1, GFP-hPinX1 resided predominantly in the nucleolus. Nuclear hPinX1 bound to telomeres and other repeat sequences as well but, despite its interaction with TRF1, nucleolar hPinX1 did not bind to telomeres. Nucleolar hPinX1 forced endogenous TRF1 accumulation in the nucleolus. Furthermore, TRF1 binding to telomeres was upregulated in cells over-expressing hPinX1. In an ALT cell line, WI-38 VA-13, TRF1 did not co-localize with hPinX1 in the nucleoli. In summary, hPinX1 likely interacts with TRF1 in both the nucleolus and the nucleoplasm, and excess hPinX1 results in increased telomere binding of TRF1. The PinX1 function of mediating TRF1 nucleolar accumulation is absent from ALT cells, suggesting that it might be telomerase-dependent.
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Affiliation(s)
- Jeong Eun Yoo
- Department of Pathology, Institute of Gastroenterology, Center for Chronic Metabolic Disease, Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
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28
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Her YR, Chung IK. Ubiquitin Ligase RLIM Modulates Telomere Length Homeostasis through a Proteolysis of TRF1. J Biol Chem 2009; 284:8557-66. [PMID: 19164295 DOI: 10.1074/jbc.m806702200] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The telomeric protein TRF1 negatively regulates telomere length by inhibiting telomerase access at the telomere termini, suggesting that the protein level of TRF1 at telomeres is tightly regulated. Regulation of TRF1 protein abundance is essential for proper telomere function and occurs primarily through post-translational modifications of TRF1. Here we describe RLIM, a RING H2 zinc finger protein with intrinsic ubiquitin ligase activity, as a TRF1-interacting protein. RLIM increases TRF1 turnover by targeting it for degradation by the proteasome in a ubiquitin-dependent manner, independently of Fbx4, which is known to interact with and negatively regulate TRF1. Whereas overexpression of RLIM decreases the level of TRF1 protein, depletion of endogenous RLIM expression by small hairpin RNA increases the level of TRF1 and leads to telomere shortening, thereby impairing cell growth. These results demonstrate that RLIM is involved in the negative regulation of TRF1 function through physical interaction and ubiquitin-mediated proteolysis. Hence, RLIM represents a new pathway for telomere maintenance by modulating the level of TRF1 at telomeres.
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Affiliation(s)
- Yoon Ra Her
- Department of Biology, College of Life Science and Biotechnology, Yonsei University, Seoul 120-749, Korea
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29
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Circadian gene expression is resilient to large fluctuations in overall transcription rates. EMBO J 2008; 28:123-34. [PMID: 19078963 DOI: 10.1038/emboj.2008.262] [Citation(s) in RCA: 107] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2008] [Accepted: 11/24/2008] [Indexed: 11/08/2022] Open
Abstract
Mammalian circadian oscillators are considered to rely on transcription/translation feedback loops in clock gene expression. The major and essential loop involves the autorepression of cryptochrome (Cry1, Cry2) and period (Per1, Per2) genes. The rhythm-generating circuitry is functional in most cell types, including cultured fibroblasts. Using this system, we show that significant reduction in RNA polymerase II-dependent transcription did not abolish circadian oscillations, but surprisingly accelerated them. A similar period shortening was observed at reduced incubation temperatures in wild-type mouse fibroblasts, but not in cells lacking Per1. Our data suggest that mammalian circadian oscillators are resilient to large fluctuations in general transcription rates and temperature, and that PER1 has an important function in transcription and temperature compensation.
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A genomewide suppressor and enhancer analysis of cdc13-1 reveals varied cellular processes influencing telomere capping in Saccharomyces cerevisiae. Genetics 2008; 180:2251-66. [PMID: 18845848 DOI: 10.1534/genetics.108.092577] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
In Saccharomyces cerevisiae, Cdc13 binds telomeric DNA to recruit telomerase and to "cap" chromosome ends. In temperature-sensitive cdc13-1 mutants telomeric DNA is degraded and cell-cycle progression is inhibited. To identify novel proteins and pathways that cap telomeres, or that respond to uncapped telomeres, we combined cdc13-1 with the yeast gene deletion collection and used high-throughput spot-test assays to measure growth. We identified 369 gene deletions, in eight different phenotypic classes, that reproducibly demonstrated subtle genetic interactions with the cdc13-1 mutation. As expected, we identified DNA damage checkpoint, nonsense-mediated decay and telomerase components in our screen. However, we also identified genes affecting casein kinase II activity, cell polarity, mRNA degradation, mitochondrial function, phosphate transport, iron transport, protein degradation, and other functions. We also identified a number of genes of previously unknown function that we term RTC, for restriction of telomere capping, or MTC, for maintenance of telomere capping. It seems likely that many of the newly identified pathways/processes that affect growth of budding yeast cdc13-1 mutants will play evolutionarily conserved roles at telomeres. The high-throughput spot-testing approach that we describe is generally applicable and could aid in understanding other aspects of eukaryotic cell biology.
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31
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Wu ZQ, Yang X, Weber G, Liu X. Plk1 phosphorylation of TRF1 is essential for its binding to telomeres. J Biol Chem 2008; 283:25503-25513. [PMID: 18625707 PMCID: PMC2533076 DOI: 10.1074/jbc.m803304200] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2008] [Revised: 07/08/2008] [Indexed: 11/06/2022] Open
Abstract
In a search for Polo-like kinase 1 (Plk1) interaction proteins, we have identified TRF1 (telomeric repeat binding factor 1) as a potential Plk1 target. In this communication we report further characterization of the interaction. We show that Plk1 associates with TRF1, and Plk1 phosphorylates TRF1 at Ser-435 in vivo. Moreover, Cdk1, serving as a priming kinase, phosphorylates TRF1 to generate a docking site for Plk1 toward TRF1. In the presence of nocodazole, ectopic expression of wild type TRF1 but not TRF1 with alanine mutation in the Plk1 phosphorylation site induces apoptosis in cells containing short telomeres but not in cells containing long telomeres. Unexpectedly, down-regulation of TRF1 by RNA interference affects cell proliferation and results in obvious apoptosis in cells with short telomeres but not in cells with long telomeres. Importantly, we observe that telomeric DNA binding ability of TRF1 is cell cycle-regulated and reaches a peak during mitosis. Upon phosphorylation by Plk1 in vivo and in vitro, the ability of TRF1 to bind telomeric DNA is dramatically increased. These results demonstrate that Plk1 interacts with and phosphorylates TRF1 and suggest that Plk1-mediated phosphorylation is involved in both TRF1 overexpression-induced apoptosis and its telomeric DNA binding ability.
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Affiliation(s)
- Zhao-Qiu Wu
- Department of Biochemistry and the Cancer Center, Purdue University, West Lafayette, Indiana 47907
| | - Xiaoming Yang
- College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Gregory Weber
- Department of Biochemistry and the Cancer Center, Purdue University, West Lafayette, Indiana 47907
| | - Xiaoqi Liu
- Department of Biochemistry and the Cancer Center, Purdue University, West Lafayette, Indiana 47907.
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