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- W3014382904 abstract "High telomerase activity is restricted to the blastocyst stage of embryonic development when telomere length is reset, and is characteristic of embryonic stem cells (ESCs) and induced pluripotent stem cells (iPSCs). However, the pathways involved in telomerase regulation as a function of pluripotency remain unknown. To explore hTERT transcriptional control, we compare genome-wide interactions (4C-seq) and chromatin accessibility (ATAC-seq) between human ESCs and epithelial cells and identify several putative hTERT cis- regulatory elements. CRISPR/Cas9-mediated deletion of candidate elements in ESCs reduces the levels of hTERT mRNA but does not abolish telomerase expression, thus implicating post-transcriptional processes in telomerase regulation. In agreement with this hypothesis, we find an hTERT splice variant lacking exon-2 and prone to degradation, to be enriched in differentiated cells but absent from ESCs. In addition, we show that forced retention of exon-2 prevents telomerase silencing during differentiation. Lastly, we highlight a role for the splicing co-factor SON in hTERT exon-2 inclusion and identify a SON mutation in a Dyskeratosis congenita patient with short telomeres and decreased telomerase activity. Altogether, our data uncover a novel alternative splice switch that is critical for telomerase activity during development." @default.
- W3014382904 created "2020-04-10" @default.
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- W3014382904 date "2020-04-03" @default.
- W3014382904 modified "2023-10-03" @default.
- W3014382904 title "Alternative splicing is a developmental switch for hTERT expression" @default.
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- W3014382904 doi "https://doi.org/10.1101/2020.04.02.022087" @default.
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