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Biallelic variants in coenzyme Q10 biosynthesis pathway genes cause a retinitis pigmentosa phenotype.

Published version
Peer-reviewed

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Authors

Cancellieri, Francesca  ORCID logo  https://orcid.org/0000-0001-8476-5366
Pohl, Lisa 
Li, Catherina HZ 
Heaton, Robert A 

Abstract

The aim of this study was to investigate coenzyme Q10 (CoQ10) biosynthesis pathway defects in inherited retinal dystrophy. Individuals affected by inherited retinal dystrophy (IRD) underwent exome or genome sequencing for molecular diagnosis of their condition. Following negative IRD gene panel analysis, patients carrying biallelic variants in CoQ10 biosynthesis pathway genes were identified. Clinical data were collected from the medical records. Haplotypes harbouring the same missense variant were characterised from family genome sequencing (GS) data and direct Sanger sequencing. Candidate splice variants were characterised using Oxford Nanopore Technologies single molecule sequencing. The CoQ10 status of the human plasma was determined in some of the study patients. 13 individuals from 12 unrelated families harboured candidate pathogenic genotypes in the genes: PDSS1, COQ2, COQ4 and COQ5. The PDSS1 variant c.589 A > G was identified in three affected individuals from three unrelated families on a possible ancestral haplotype. Three variants (PDSS1 c.468-25 A > G, PDSS1 c.722-2 A > G, COQ5 c.682-7 T > G) were shown to lead to cryptic splicing. 6 affected individuals were diagnosed with non-syndromic retinitis pigmentosa and 7 had additional clinical findings. This study provides evidence of CoQ10 biosynthesis pathway gene defects leading to non-syndromic retinitis pigmentosa in some cases. Intronic variants outside of the canonical splice-sites represent an important cause of disease. RT-PCR nanopore sequencing is effective in characterising these splice defects.

Description

Keywords

Article, /631/208/2489/144, /692/699/3161/3165, article

Journal Title

NPJ Genom Med

Conference Name

Journal ISSN

2056-7944
2056-7944

Volume Title

Publisher

Springer Science and Business Media LLC
Sponsorship
Fight for Sight UK (5045/46)
National Eye Research Centre (NERC) (SAC051)
Wellcome Trust (Wellcome) (206619/Z/17/Z, 206619/Z/17/Z)