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- W3005076731 abstract "Biogenesis of the human telomerase RNA (hTR) involves a complex series of posttranscriptional modifications, including hypermethylation of the 5′ mono-methylguanosine cap to a tri-methylguanosine cap (TMG). How the TMG cap affects hTR maturation is unknown. Here, we show that depletion of trimethylguanosine synthase 1 (TGS1), the enzyme responsible for cap hypermethylation, increases levels of hTR and telomerase. Diminished trimethylation increases hTR association with the cap-binding complex (CBC) and with Sm chaperone proteins. Loss of TGS1 causes an increase in accumulation of mature hTR in both the nucleus and the cytoplasm compared with controls. In TGS1 mutant cells, increased hTR assembles with telomerase reverse transcriptase (TERT) protein to yield elevated active telomerase complexes and increased telomerase activity, resulting in telomere elongation in cultured human cells. Our results show that TGS1-mediated hypermethylation of the hTR cap inhibits hTR accumulation, restrains levels of assembled telomerase, and limits telomere elongation." @default.
- W3005076731 created "2020-02-14" @default.
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- W3005076731 date "2020-02-01" @default.
- W3005076731 modified "2023-10-18" @default.
- W3005076731 title "Loss of Human TGS1 Hypermethylase Promotes Increased Telomerase RNA and Telomere Elongation" @default.
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- W3005076731 doi "https://doi.org/10.1016/j.celrep.2020.01.004" @default.
- W3005076731 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7156301" @default.
- W3005076731 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32023455" @default.
- W3005076731 hasPublicationYear "2020" @default.
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