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Gallardo, F, Olivier, C, Dandjinou, AT, Wellinger, RJ and Chartrand, P (2008) TLC1 RNA nucleo-cytoplasmic trafficking links telomerase biogenesis to its recruitment to telomeres. EMBO J. 27:748-57


The yeast telomerase holoenzyme, which adds telomeric repeats at the chromosome ends, is composed of the TLC1 RNA and the associated proteins Est1, Est2 and Est3. To study the biogenesis of telomerase in endogenous conditions, we performed fluorescent in situ hybridization on the native TLC1 RNA. We found that the telomerase RNA colocalizes with telomeres in G1- to S-phase cells. Strains lacking any one of the Est proteins accumulate TLC1 RNA in their cytoplasm, indicating that a critical stage of telomerase biogenesis could take place outside of the nucleus. We were able to demonstrate that endogenous TLC1 RNA shuttles between the nucleus and the cytoplasm, in association with the Crm1p exportin and the nuclear importins Mtr10p-Kap122p. Furthermore, nuclear retention of the TLC1 RNA is impaired in the absence of yKu70p, Tel1p or the MRX complex, which recruit telomerase to telomeres. Altogether, our results reveal that the nucleo-cytoplasmic trafficking of the TLC1 RNA is an important step in telomere homeostasis, and link telomerase biogenesis to its recruitment to telomeres.


PubMed PMC2265757 Online version:10.1038/emboj.2008.21


In Situ Hybridization, Fluorescence; Karyopherins/metabolism; RNA Transport; RNA, Fungal/metabolism; Receptors, Cytoplasmic and Nuclear/metabolism; Telomerase/metabolism; Telomere/metabolism; Yeasts



Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status



GO:0032210: regulation of telomere maintenance via telomerase

ECO:0000315: mutant phenotype evidence used in manual assertion


Seeded From UniProt


See also


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