Biallelic variants in the ciliary gene TMEM67 cause RHYNS syndrome

Undiagnosed Disease Network Italy

Research output: Contribution to journalArticle

Abstract

A rare syndrome was first described in 1997 in a 17-year-old male patient presenting with Retinitis pigmentosa, HYpopituitarism, Nephronophthisis and Skeletal dysplasia (RHYNS). In the single reported familial case, two brothers were affected, arguing for X-linked or recessive mode of inheritance. Up to now, the underlying genetic basis of RHYNS syndrome remains unknown. Here we applied whole-exome sequencing in the originally described family with RHYNS to identify compound heterozygous variants in the ciliary gene TMEM67. Sanger sequencing confirmed a paternally inherited nonsense c.622A > T, p.(Arg208*) and a maternally inherited missense variant c.1289A > G, p.(Asp430Gly), which perturbs the correct splicing of exon 13. Overall, TMEM67 showed one of the widest clinical continuum observed in ciliopathies ranging from early lethality to adults with liver fibrosis. Our findings extend the spectrum of phenotypes/syndromes resulting from biallelic TMEM67 variants to now eight distinguishable clinical conditions including RHYNS syndrome.

Original languageEnglish
Pages (from-to)1266-1271
Number of pages6
JournalEuropean Journal of Human Genetics
Volume26
Issue number9
DOIs
Publication statusPublished - Sep 1 2018

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ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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