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PUS7 mutations impair pseudouridylation in humans and cause intellectual disability and microcephaly

Abstract

Pseudouridylation is the most common post-transcriptional modification, wherein uridine is isomerized into 5-ribosyluracil (pseudouridine, Ψ). The resulting increase in base stacking and creation of additional hydrogen bonds are thought to enhance RNA stability. Pseudouridine synthases are encoded in humans by 13 genes, two of which are linked to Mendelian diseases: PUS1 and PUS3. Very recently, PUS7 mutations were reported to cause intellectual disability with growth retardation. We describe two families in which two different homozygous PUS7 mutations (missense and frameshift deletion) segregate with a phenotype comprising intellectual disability and progressive microcephaly. Short stature and hearing loss were variable in these patients. Functional characterization of the two mutations confirmed that both result in decreased levels of Ψ13 in tRNAs. Furthermore, the missense variant of the S. cerevisiae ortholog failed to complement the growth defect of S. cerevisiae pus7Δ trm8Δ mutants. Our results confirm that PUS7 is a bona fide Mendelian disease gene and expand the list of human diseases caused by impaired pseudouridylation.

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Acknowledgements

We thank the study family for their enthusiastic participation. We also thank Mais Hashem, Niema Ibrahim and Firdous Abdulwahab for their help in coordinating the recruitment of the families and the Sequencing and Genotyping Core Facilities at KFSHRC for their technical help. This work was supported by the King Salman Center for Disability Research (F.S.A.), the Saudi Human Genome Program (F.S.A.), and by National Institutes of Health grant GM052347 (E.M.P.). M.T. was partially supported by NIH Training Grant in Cellular, Biochemical, and Molecular Sciences GM068411.

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Correspondence to Eric M. Phizicky or Fowzan S. Alkuraya.

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Shaheen, R., Tasak, M., Maddirevula, S. et al. PUS7 mutations impair pseudouridylation in humans and cause intellectual disability and microcephaly. Hum Genet 138, 231–239 (2019). https://doi.org/10.1007/s00439-019-01980-3

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Keywords

  • Pseudouridylation
  • Microcephaly
  • PUS7