Abstract
Mutations in the PARN gene (encoding poly(A)-specific ribonuclease) cause telomere diseases including familial idiopathic pulmonary fibrosis (IPF) and dyskeratosis congenita1,2, but how PARN deficiency impairs telomere maintenance is unclear. Here, using somatic cells and induced pluripotent stem cells (iPSCs) from patients with dyskeratosis congenita with PARN mutations, we show that PARN is required for the 3′-end maturation of the telomerase RNA component (TERC). Patient-derived cells as well as immortalized cells in which PARN is disrupted show decreased levels of TERC. Deep sequencing of TERC RNA 3′ termini shows that PARN is required for removal of post-transcriptionally acquired oligo(A) tails that target nuclear RNAs for degradation. Diminished TERC levels and the increased proportion of oligo(A) forms of TERC are normalized by restoring PARN, which is limiting for TERC maturation in cells. Our results demonstrate a new role for PARN in the biogenesis of TERC and provide a mechanism linking PARN mutations to telomere diseases.
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Acknowledgements
We thank the patients and their families for participation in the research; B.A. Croker, G.Q. Daley and L.I. Zon for comments on the manuscript; and K.E. Gagne for technical assistance. The work was funded in part by the Translational Research Program and the Stem Cell Program, Boston Children's Hospital (S.A.); the Manton Center for Orphan Disease Research (D.H.M.); and the Scientific and Technological Research Council of Turkey (B.B.).
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S.A. and D.H.M. conceived the study, executed experiments, analyzed data, prepared figures and wrote the manuscript. B.B. and M.S. executed experiments, analyzed data and prepared figures. E.G. provided patient information. I.H. provided registry infrastructure. P.C. wrote custom bioinformatics scripts and analyzed the RNA-seq data. A.K.T. performed next-generation sequencing, wrote custom bioinformatics scripts and analyzed the 3′ RACE deep sequencing data.
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Moon, D., Segal, M., Boyraz, B. et al. Poly(A)-specific ribonuclease (PARN) mediates 3′-end maturation of the telomerase RNA component. Nat Genet 47, 1482–1488 (2015). https://doi.org/10.1038/ng.3423
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DOI: https://doi.org/10.1038/ng.3423
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