Broadening INPP5E phenotypic spectrum: detection of rare variants in syndromic and non-syndromic IRD

Riccardo Sangermano, Iris Deitch, Virginie G. Peter, Rola Ba-Abbad, Emily M. Place, Erin Zampaglione, Naomi E. Wagner, Anne B. Fulton, Luisa Coutinho-Santos, Boris Rosin, Vincent Dunet, Ala’a AlTalbishi, Eyal Banin, Ana Berta Sousa, Mariana Neves, Anna Larson, Mathieu Quinodoz, Michel Michaelides, Tamar Ben-Yosef, Eric A. PierceCarlo Rivolta, Andrew R. Webster, Gavin Arno, Dror Sharon, Rachel M. Huckfeldt, Kinga M. Bujakowska

Research output: Contribution to journalArticlepeer-review

Abstract

Pathogenic variants in INPP5E cause Joubert syndrome (JBTS), a ciliopathy with retinal involvement. However, despite sporadic cases in large cohort sequencing studies, a clear association with non-syndromic inherited retinal degenerations (IRDs) has not been made. We validate this association by reporting 16 non-syndromic IRD patients from ten families with bi-allelic mutations in INPP5E. Additional two patients showed early onset IRD with limited JBTS features. Detailed phenotypic description for all probands is presented. We report 14 rare INPP5E variants, 12 of which have not been reported in previous studies. We present tertiary protein modeling and analyze all INPP5E variants for deleteriousness and phenotypic correlation. We observe that the combined impact of INPP5E variants in JBTS and non-syndromic IRD patients does not reveal a clear genotype–phenotype correlation, suggesting the involvement of genetic modifiers. Our study cements the wide phenotypic spectrum of INPP5E disease, adding proof that sequence defects in this gene can lead to early-onset non-syndromic IRD.

Original languageEnglish
Article number53
Journalnpj Genomic Medicine
Volume6
Issue number1
DOIs
StatePublished - 29 Jun 2021

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Genetics
  • Genetics(clinical)

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