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1. A Cajal body-independent pathway for telomerase trafficking in mice

Author

Bradley R. Culp, Rebecca L. Tomlinson, Jian Li, Rebecca M. Terns, and Michael P. Terns

Subjects
Telomerase, Binding Sites, Cell Cycle, digestive, oral, and skin physiology, RNA, Coiled Bodies, Cell Biology, Telomere, Cell cycle, Biology, Molecular biology, Article, S Phase, Cell biology, Mice, Protein Transport, Cajal body, Knockout mouse, Animals, Coilin, Telomerase reverse transcriptase
Abstract

The intranuclear trafficking of human telomerase involves a dynamic interplay between multiple nuclear sites, most notably Cajal bodies and telomeres. Cajal bodies are proposed to serve as sites of telomerase maturation, storage, and assembly, as well as to function in the cell cycle-regulated delivery of telomerase to telomeres in human cells. Here, we find that telomerase RNA does not localize to Cajal bodies in mouse cells, and instead resides in separate nuclear foci throughout much of the cell cycle. However, as in humans, mouse telomerase RNA (mTR) localizes to subsets of telomeres specifically during S phase. The localization of mTR to telomeres in mouse cells does not require coilin-containing Cajal bodies, as mTR is found at telomeres at similar frequencies in cells from wild-type and coilin knockout mice. At the same time, we find that human TR localizes to Cajal bodies (as well as telomeres) in mouse cells, indicating that the distinct trafficking of mTR is attributable to an intrinsic property of the RNA (rather than a difference in the mouse cell environment such as the properties of mouse Cajal bodies). We also find that during S phase, mTR foci coalesce into short chains, with at least one of the conjoined mTR foci co-localizing with a telomere. These findings point to a novel, Cajal body-independent pathway for telomerase biogenesis and trafficking in mice.

Published
2010
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2. Telomerase trafficking and assembly in Xenopus oocytes

Author

Michael P. Terns, Zhu-Hong Li, Rebecca M. Terns, and Rebecca L. Tomlinson

Subjects
Telomerase, Microinjections, Nucleolus, Xenopus, Active Transport, Cell Nucleus, Coiled Bodies, Xenopus Proteins, Biology, medicine, Animals, Telomerase reverse transcriptase, Cloning, Molecular, Fluorescent Antibody Technique, Indirect, Research Articles, Cells, Cultured, Cell Nucleus, Nucleoplasm, Cell Cycle, digestive, oral, and skin physiology, Cell Biology, biology.organism_classification, Molecular biology, Telomere, Protein Transport, Cell nucleus, medicine.anatomical_structure, Cajal body, Oocytes, RNA, Protein Multimerization, Cell Nucleolus
Abstract

The core components of telomerase are telomerase RNA (TR) and telomerase reverse transcriptase (TERT). In vertebrate cells, TR and TERT have been reported to associate with intranuclear structures, including Cajal bodies and nucleoli as well as telomeres. Here, we examined the time course of both TR localization and assembly of TR with TERT in Xenopus oocytes. The major trafficking pathway for microinjected TR is through Cajal bodies into the nucleoplasm, with a fraction of TR found in nucleoli at later time points. Telomerase assembly precedes nucleolar localization of TR, and TR mutants that do not localize to nucleoli form active enzyme, indicating that localization of TR to nucleoli is not required for assembly with TERT. Assembly of telomerase coincides with Cajal-body localization; however, assembly is also unaffected by a CAB-box mutation (which significantly reduces association with Cajal bodies), suggesting that Cajal-body localization is not important for assembly. Our results suggest that assembly of TR with TERT occurs in the nucleoplasm. Unexpectedly, however, our experiments reveal that disruption of the CAB box does not eliminate early targeting to Cajal bodies, indicating that a role for Cajal bodies in telomerase assembly cannot be excluded on the basis of existing knowledge.

Published
2010
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3. Telomerase Reverse Transcriptase Is Required for the Localization of Telomerase RNA to Cajal Bodies and Telomeres in Human Cancer Cells

Author

Michael P. Terns, Rebecca L. Tomlinson, Hinh Ly, Christopher M. Counter, Tania D. Ziegler, Rebecca M. Terns, and Eladio Abreu

Subjects
Telomerase, RNA, Untranslated, Antigens, Polyomavirus Transforming, Coiled Bodies, Biology, S Phase, Telomerase RNA component, Cell Line, Tumor, Humans, Telomerase reverse transcriptase, Molecular Biology, In Situ Hybridization, Fluorescence, digestive, oral, and skin physiology, RNA, Articles, Cell Biology, Telomere, Cell cycle, Molecular biology, Cell biology, Gene Expression Regulation, Neoplastic, Bromodeoxyuridine, Microscopy, Fluorescence, Cajal body, Cancer cell, RNA, Long Noncoding, HeLa Cells
Abstract

Telomere maintenance by telomerase is critical for the unlimited division potential of most human cancer cells. The two essential components of human telomerase, telomerase RNA (hTR) and telomerase reverse transcriptase (hTERT), are recruited from distinct subnuclear sites to telomeres during S phase. Throughout the remainder of the cell cycle hTR is found primarily in Cajal bodies. The localization of hTR to Cajal bodies and telomeres is specific to cancer cells where telomerase is active and is not observed in primary cells. Here we show that the trafficking of hTR to both telomeres and Cajal bodies depends on hTERT. RNA interference–mediated depletion of hTERT in cancer cells leads to loss of hTR from both Cajal bodies and telomeres without affecting hTR levels. In addition, expression of hTERT in telomerase-negative cells (including primary and ALT cancer cell lines) induces hTR to localize to both sites. Factors that did not stimulate hTR localization in our experiments include increased hTR RNA levels and Cajal body numbers, and expression of SV40 large T antigen and oncogenic Ras. Our findings suggest that the trafficking of telomerase to Cajal bodies and telomeres in cancer cells correlates with and depends on the assembly of the enzyme.

Published
2008
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4. Telomerase RNA Accumulates in Cajal Bodies in Human Cancer Cells

Author

Rebecca L. Tomlinson, Andrew A. Lukowiak, Rebecca M. Terns, Michael P. Terns, and Yusheng Zhu

Subjects
Male, Telomerase, Coiled Bodies, In situ hybridization, Biology, Animals, Humans, Telomerase reverse transcriptase, Fluorescent Antibody Technique, Indirect, Molecular Biology, Cells, Cultured, In Situ Hybridization, Fluorescence, RNA, Articles, Cell Biology, Molecular biology, Cell Compartmentation, Telomere, DNA-Binding Proteins, Cajal body, Cancer cell, Female, Coilin, HeLa Cells
Abstract

Telomerase synthesizes telomeric DNA repeats at the ends of eukaryotic chromosomes. The RNA component of the enzyme (hTR) provides the template for telomere synthesis, which is catalyzed by telomerase reverse transcriptase (hTERT). Little is known regarding the subcellular localization of hTR and hTERT and the pathway by which telomerase is assembled. Here we report the first glimpse of the detailed subcellular localization of endogenous hTR in human cells, which we obtained by fluorescence in situ hybridization (FISH). Our studies have revealed a distinctive hTR localization pattern in cancer cells. We have found that hTR accumulates within intranuclear foci called Cajal bodies in all typical tumor-derived cell lines examined (in which telomerase is active), but not in primary or ALT cells (where little or no hTERT is present). Accumulation of hTR in the Cajal bodies of primary cells is induced when hTERT is ectopically expressed. Moreover, we report that hTERT is also found in Cajal bodies. Our data suggest that Cajal bodies are involved in the assembly and/or function of human telomerase.

Published
2004
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5. A genome-wide linkage and association scan reveals novel loci for autism

Author

Zak Kohane, Jeremy Goldberg, Carine Mantoulan, Shaun Purcell, Jessica Brian, Magdalena Laskawiec, Christopher A. Walsh, Irma Moilanen, Ridha Joober, Peter Szatmari, Olena Korvatska, Kerim Munir, James F. Gusella, Rudolph E. Tanzi, David L. Pauls, Generoso G. Gascon, Christine Stevens, Linda Lotspeich, John I. Nurnberger, Ramzi Nazir, Jonathan Green, Brian L. Yaspan, Marion Leboyer, Ann P. Thompson, Shun-Chiao Chang, Carolyn Bridgemohan, Louise Gallagher, Jeff Munson, Michael Gill, Guiqing Cai, Fritz Poustka, Regina Regan, Aislyn Cangialose, Gerard D. Schellenberg, Christopher J. McDougle, Christina Corsello, Wendy Roberts, Thomas H. Wassink, Majid Ghadami, Ellen M. Hanson, Benjamin M. Neale, Stacey Gabriel, Lonnie Zwaigenbaum, John Tsiantis, Hanna Ebeling, Sabine M. Klauck, Elaine LeClair, Bernie Devlin, Steven A. McCarroll, Ashley O'Connor, Andrew Pickles, Emily L. Crawford, Katja Jussila, Helen McConachie, Christopher Gillberg, Brenda E. Barry, Lou Kunkel, Seung Yun Yoo, Jennifer N. Partlow, Stephanie Brewster O'Neil, Ingrid A. Holm, Judith Miller, Guy A. Rouleau, Val C. Sheffield, Catherine Lord, Judith S. Palfrey, Ellen M. Wijsman, Astrid M. Vicente, Azam Hosseinipour, Ronald E. Becker, James S. Sutcliffe, Fred R. Volkmar, Marja Leena Mattila, Katerina Papanikolaou, Jennifer Reichert, Edwin H. Cook, Pamela Sklar, Elena Maestrini, Hilary Coon, Sek Won Kong, Stephen A. Haddad, Todd Green, Gillian Baird, Andrew Kirby, Patrick Bolton, Robert Sean Hill, Eric M. Morrow, Tom Berney, Jonathan L. Haines, Maryam Valujerdi, Casey Gates, David J. Posey, Karola Rehnström, Alistair T. Pagnamenta, Christine M. Freitag, Eric Fombonne, Janice Ware, Christian R. Marshall, Janine A. Lamb, Lauren A. Weiss, Agatino Battaglia, Nancy J. Minshew, Roksana Sasanfar, Elizabeth Baroni, Maretha de Jonge, Lennart von Wendt, Gina Hilton, Dalila Pinto, Nahit Motavalli Mukaddes, Ala Tolouei, Catalina Betancur, Michael Rutter, Tram Tran, Eftichia Duketis, Laurent Mottron, Margaret A. Pericak-Vance, Kristen West, Joachim Hallmayer, Kirsty Wing, Kerstin Wittemeyer, Rachel J. Hundley, Herman van Engeland, Judith Conroy, Mark J. Daly, Asif Hashmi, Michael L. Cuccaro, Geraldine Dawson, Sanna Kuusikko, Richard Anney, Anthony P. Monaco, Brian Winkloski, Samira Al-Saad, Dan E. Arking, Veronica J. Vieland, Stephen W. Scherer, Soher Balkhy, Kara Andresen, Rebecca L. Tomlinson, Joseph D. Buxbaum, Aravinda Chakravarti, Xiao-Qing Liu, Lindsay Jackson, Jaakko Ignatius, Catarina Correia, Leonard Rappaport, Heather Peters, Julie Gauthier, John R. Gilbert, Jeremy R. Parr, Carrie Sougnez, Katherine E. Tansey, Bennett L. Leventha, Annemarie Poustka, Daniel H. Geschwind, Annette Estes, Leena Peltonen, Maryam Rostami, Jeff Salt, David Altshuler, Simon Wallace, Susan E. Bryson, William M. Mahoney, Katy Renshaw, Robert M. Joseph, Lisa H. Albers, Inês Cabrito, Sean Ennis, Vanessa Hus, Guiomar Oliveira, Ann Le Couteur, Joseph Piven, Sandra L. Friedman, Penny Farrar, Joshua M. Korn, Sven Bölte, Camille W. Brune, Esau Simmons, Susan L. Santangelo, Andrew D. Paterson, Rita M. Cantor, Andrew B. West, Finny G Kuruvilla, Tiago R. Magalhaes, Andrew Green, Alison Schonwald, Stephen J. Guter, Anthony J. Bailey, Bernadette Rogé, William M. McMahon, Massachusetts General Hospital [Boston], Harvard Medical School [Boston] (HMS), Broad Institute of MIT and Harvard (BROAD INSTITUTE), Harvard Medical School [Boston] (HMS)-Massachusetts Institute of Technology (MIT)-Massachusetts General Hospital [Boston], Johns Hopkins University (JHU), Helsingin yliopisto = Helsingfors universitet = University of Helsinki, Génétique de l'autisme = Genetics of Autism (NPS-01), Neuroscience Paris Seine (NPS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Biologie Paris Seine (IBPS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Biologie Paris Seine (IBPS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Betancur, Catalina, University of Helsinki, Neurosciences Paris Seine (NPS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Biologie Paris Seine (IBPS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Biologie Paris Seine (IBPS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), WEISS LA, ARKING DE, and GENE DISCOVERY PROJECT OF JOHNS HOPKINS & THE AUTISM CONSORTIUM, DALY MJ, CHAKRAVARTI A, BRUNE CW, WEST K, O'CONNOR A, HILTON G, TOMLINSON RL, WEST AB, COOK EH JR, CHAKRAVARTI A, WEISS LA, GREEN T, CHANG SC, GABRIEL S, GATES C, HANSON EM, KIRBY A, KORN J, KURUVILLA F, MCCARROLL S, MORROW EM, NEALE B, PURCELL S, SASANFAR R, SOUGNEZ C, STEVENS C, ALTSHULER D, GUSELLA J, SANTANGELO SL, SKLAR P, TANZI R, DALY MJ, ANNEY R, BAILEY AJ, BAIRD G, BATTAGLIA A, BERNEY T, BETANCUR C, BÖLTE S, BOLTON PF, BRIAN J, BRYSON SE, BUXBAUM JD, CABRITO I, CAI G, CANTOR RM, COOK EH JR, COON H, CONROY J, CORREIA C, CORSELLO C, CRAWFORD EL, CUCCARO ML, DAWSON G, DE JONGE M, DEVLIN B, DUKETIS E, ENNIS S, ESTES A, FARRAR P, FOMBONNE E, FREITAG CM, GALLAGHER L, GESCHWIND DH, GILBERT J, GILL M, GILLBERG C, GOLDBERG J, GREEN A, GREEN J, GUTER SJ, HAINES JL, HALLMAYER JF, HUS V, KLAUCK SM, KORVATSKA O, LAMB JA, LASKAWIEC M, LEBOYER M, COUTEUR AL, LEVENTHAL BL, LIU XQ, LORD C, LOTSPEICH LJ, MAESTRINI E, MAGALHAES T, MAHONEY W, MANTOULAN C, MCCONACHIE H, MCDOUGLE CJ, MCMAHON WM, MARSHALL CR, MILLER J, MINSHEW NJ, MONACO AP, MUNSON J, NURNBERGER JI JR, OLIVEIRA G, PAGNAMENTA A, PAPANIKOLAOU K, PARR JR, PATERSON AD, PERICAK-VANCE MA, PICKLES A, PINTO D, PIVEN J, POSEY DJ, POUSTKA A, POUSTKA F, REGAN R, REICHERT J, RENSHAW K, ROBERTS W, ROGE B, RUTTER ML, SALT J, SCHELLENBERG GD, SCHERER SW, SHEFFIELD V, SUTCLIFFE JS, SZATMARI P, TANSEY K, THOMPSON AP, TSIANTIS J, VAN ENGELAND H, VICENTE AM, VIELAND VJ, VOLKMAR F, WALLACE S, WASSINK TH, WIJSMAN EM, WING K, WITTEMEYER K, YASPAN BL, ZWAIGENBAUM L, MORROW EM, YOO SY, HILL RS, MUKADDES NM, BALKHY S, GASCON G, AL-SAAD S, HASHMI A, WARE J, JOSEPH RM, LECLAIR E, PARTLOW JN, BARRY B, WALSH CA, PAULS D, MOILANEN I, EBELING H, MATTILA ML, KUUSIKKO S, JUSSILA K, IGNATIUS J, SASANFAR R, TOLOUEI A, GHADAMI M, ROSTAMI M, HOSSEINIPOUR A, VALUJERDI M, SANTANGELO SL, ANDRESEN K, WINKLOSKI B, HADDAD S, KUNKEL L, KOHANE Z, TRAN T, KONG SW, O'NEIL SB, HANSON EM, HUNDLEY R, HOLM I, PETERS H, BARONI E, CANGIALOSE A, JACKSON L, ALBERS L, BECKER R, BRIDGEMOHAN C, FRIEDMAN S, MUNIR K, NAZIR R, PALFREY J, SCHONWALD A, SIMMONS E, RAPPAPORT LA, GAUTHIER J, MOTTRON L, JOOBER R, FOMBONNE E, ROULEAU G, REHNSTROM K, VON WENDT L, PELTONEN L.

Subjects
Perturbação Autística, Internationality, Genetic Linkage, Genome-wide association study, MESH: Semaphorins, Semaphorins, [SDV.GEN] Life Sciences [q-bio]/Genetics, 0302 clinical medicine, Neurodevelopmental disorder, Heritability of autism, MESH: Nerve Tissue Proteins, Association mapping, Genetics, 0303 health sciences, Multidisciplinary, MESH: Polymorphism, Single Nucleotide, MESH: Genetic Predisposition to Disease, Brain, Chromosome Mapping, Chromosomes, Human, Pair 5, MESH: Membrane Proteins, MESH: Chromosomes, Human, Pair 5, MESH: Autistic Disorder, MESH: Genetic Linkage, Single-nucleotide polymorphism, Nerve Tissue Proteins, Biology, Polymorphism, Single Nucleotide, Article, 03 medical and health sciences, MESH: Brain, Genetic linkage, medicine, Humans, Genetic Predisposition to Disease, Autistic Disorder, MESH: Sample Size, 030304 developmental biology, Genetic association, [SDV.GEN]Life Sciences [q-bio]/Genetics, MESH: Humans, Membrane Proteins, medicine.disease, Sample Size, Perturbações do Desenvolvimento Infantil e Saúde Mental, MESH: Genome-Wide Association Study, MESH: Internationality, Autism, MESH: Chromosome Mapping, Predisposição Genética para Doença, 030217 neurology & neurosurgery, Genome-Wide Association Study
Abstract

Member of the Autism Genome Project Consortium: Astrid M. Vicente Although autism is a highly heritable neurodevelopmental disorder, attempts to identify specific susceptibility genes have thus far met with limited success. Genome-wide association studies using half a million or more markers, particularly those with very large sample sizes achieved through meta-analysis, have shown great success in mapping genes for other complex genetic traits. Consequently, we initiated a linkage and association mapping study using half a million genome-wide single nucleotide polymorphisms (SNPs) in a common set of 1,031 multiplex autism families (1,553 affected offspring). We identified regions of suggestive and significant linkage on chromosomes 6q27 and 20p13, respectively. Initial analysis did not yield genome-wide significant associations; however, genotyping of top hits in additional families revealed an SNP on chromosome 5p15 (between SEMA5A and TAS2R1) that was significantly associated with autism (P = 2 x 10(-7)). We also demonstrated that expression of SEMA5A is reduced in brains from autistic patients, further implicating SEMA5A as an autism susceptibility gene. The linkage regions reported here provide targets for rare variation screening whereas the discovery of a single novel association demonstrates the action of common variants.

Published
2009
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6. Cell cycle-regulated trafficking of human telomerase to telomeres

Author

Teerawit Supakorndej, Rebecca L. Tomlinson, Michael P. Terns, Rebecca M. Terns, and Tania D. Ziegler

Subjects
Telomerase, RNA, Untranslated, Nucleolus, Coiled Bodies, Biology, DNA-binding protein, Models, Biological, S Phase, Telomerase RNA component, Humans, Telomerase reverse transcriptase, Molecular Biology, Cell Cycle, Cell Biology, Articles, Cell cycle, Telomere, Molecular biology, Transport protein, Cell biology, DNA-Binding Proteins, Protein Transport, RNA, RNA, Long Noncoding, Cell Nucleolus, HeLa Cells
Abstract

Telomerase synthesizes telomeres at the ends of human chromosomes during S phase. The results presented here suggest that telomerase activity may be regulated by intranuclear trafficking of the key components of the enzyme in human cells. We examined the subcellular localization of endogenous human telomerase RNA (hTR) and telomerase reverse transcriptase (hTERT) in HeLa cervical carcinoma cells. Throughout most of the cell cycle, we found that the two essential components of telomerase accumulate at intranuclear sites separate from telomeres. However, during S phase, both hTR and hTERT are specifically recruited to subsets of telomeres. The localization of telomerase to telomeres is dynamic, peaking at mid-S phase. We also found complex associations of both hTR and hTERT with nucleoli and Cajal bodies during S phase, implicating both structures in the biogenesis and trafficking of telomerase. Our results mark the first observation of human telomerase at telomeres and provide a mechanism for the cell cycle-dependent regulation of telomere synthesis in human cells.

Published
2005

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