Replication Timing of Human Telomeres Is Chromosome Arm-Specific, Influenced by Subtelomeric Structures and Connected to Nuclear Localization

Abstract : The mechanisms governing telomere replication in humans are still poorly understood. To fill this gap, we investigated the timing of replication of single telomeres in human cells. Using in situ hybridization techniques, we have found that specific telomeres have preferential time windows for replication during the S-phase and that these intervals do not depend upon telomere length and are largely conserved between homologous chromosomes and between individuals, even in the presence of large subtelomeric segmental polymorphisms. Importantly, we show that one copy of the 3.3 kb macrosatellite repeat D4Z4, present in the subtelomeric region of the late replicating 4q35 telomere, is sufficient to confer both a more peripheral localization and a later-replicating property to a de novo formed telomere. Also, the presence of β-satellite repeats next to a newly created telomere is sufficient to delay its replication timing. Remarkably, several native, non-D4Z4-associated, late-replicating telomeres show a preferential localization toward the nuclear periphery, while several early-replicating telomeres are associated with the inner nuclear volume. We propose that, in humans, chromosome arm-specific subtelomeric sequences may influence both the spatial distribution of telomeres in the nucleus and their replication timing.
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Article dans une revue
PLoS Genetics, Public Library of Science, 2010, 6 (4), pp.e1000920. 〈10.1371〉
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https://hal-ens-lyon.archives-ouvertes.fr/ensl-00815144
Contributeur : Agnès Ganivet <>
Soumis le : jeudi 18 avril 2013 - 11:28:55
Dernière modification le : jeudi 8 février 2018 - 11:09:30

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  • HAL Id : ensl-00815144, version 1
  • DOI : 10.1371

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Nausicaa Arnoult, Caroline Schluth-Bolard, Anne Letessier, Irena Drascovic, Rachida Bouarich-Bourimi, et al.. Replication Timing of Human Telomeres Is Chromosome Arm-Specific, Influenced by Subtelomeric Structures and Connected to Nuclear Localization. PLoS Genetics, Public Library of Science, 2010, 6 (4), pp.e1000920. 〈10.1371〉. 〈ensl-00815144〉

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