title: The shelterin protein POT-1 anchors Caenorhabditis elegans telomeres through SUN-1 at the nuclear periphery.
abstract: Telomeres are specialized protein-DNA structures that protect chromosome ends. In budding yeast, telomeres form clusters at the nuclear periphery. By imaging telomeres in embryos of the metazoan Caenorhabditis elegans, we found that telomeres clustered only in strains that had activated an alternative telomere maintenance pathway (ALT). Moreover, as in yeast, the unclustered telomeres in wild-type embryos were located near the nuclear envelope (NE). This bias for perinuclear localization increased during embryogenesis and persisted in differentiated cells. Telomere position in early embryos required the NE protein SUN-1, the single-strand binding protein POT-1, and the small ubiquitin-like modifier (SUMO) ligase GEI-17. However, in postmitotic larval cells, none of these factors individually were required for telomere anchoring, which suggests that additional mechanisms anchor in late development. Importantly, targeted POT-1 was sufficient to anchor chromatin to the NE in a SUN-1-dependent manner, arguing that its effect at telomeres is direct. This high-resolution description of telomere position within C. elegans extends our understanding of telomere organization in eukaryotes.
authors.affiliation: Friedrich Miescher Institute for Biomedical Research, CH-4058 Basel, Switzerland.
authors.forename: Helder C
authors.initials: HC
authors.lastname: Ferreira
authors.forename: Benjamin D
authors.initials: BD
authors.lastname: Towbin
authors.forename: Thibaud
authors.initials: T
authors.lastname: Jegou
authors.forename: Susan M
authors.initials: SM
authors.lastname: Gasser
mesh_terms: D000818:Animals; D017173:Caenorhabditis elegans / Q000196:embryology / Q000235:genetics / Q000378:metabolism*; D029742:Caenorhabditis elegans Proteins / Q000032:analysis / Q000378:metabolism / Q000502:physiology*; D002467:Cell Nucleus / Q000378:metabolism / Q000648:ultrastructure; D045584:Chromosome Positioning; D004268:DNA-Binding Proteins / Q000032:analysis / Q000378:metabolism / Q000502:physiology*; D004625:Embryo, Nonmammalian / Q000378:metabolism / Q000648:ultrastructure; D047108:Embryonic Development / Q000235:genetics; D018160:Receptors, Cytoplasmic and Nuclear / Q000032:analysis / Q000378:metabolism / Q000502:physiology*; D058207:Sumoylation; D016615:Telomere / Q000378:metabolism*; D034501:Telomere-Binding Proteins / Q000032:analysis / Q000378:metabolism / Q000502:physiology; D044767:Ubiquitin-Protein Ligases / Q000378:metabolism / Q000502:physiology
chemical_list: D029742:Caenorhabditis elegans Proteins; D004268:DNA-Binding Proteins; C586682:POT-1 protein, C elegans; C573833:POT-2 protein, C elegans; D018160:Receptors, Cytoplasmic and Nuclear; D034501:Telomere-Binding Proteins; C514114:sun-1 protein, C elegans; D044767:Ubiquitin-Protein Ligases