RPE65-related retinal dystrophy: Mutational and phenotypic spectrum in 45 affected patients.
Exp Eye Res
; 212: 108761, 2021 11.
Article
in En
| MEDLINE
| ID: mdl-34492281
ABSTRACT
INTRODUCTION:
Biallelic pathogenic RPE65 variants are related to a spectrum of clinically overlapping inherited retinal dystrophies (IRD). Most affected individuals progress to severe disease, with 50% of patients becoming legally blind by 20 years of age. Deeper knowledge of the mutational spectrum and the phenotype-genotype correlation in RPE65-related IRD is needed. PATIENTS ANDMETHODS:
Forty-five affected subjects from 27 unrelated families with a clinical diagnosis of RPE65-related IRD were included. Clinical evaluation consisted of self-reported ophthalmological history and objective ophthalmological examination. Patients' genotype was classified according to variant class (truncating or missense) or to variant location at different protein domains. The main phenotypic outcome measure was age at onset (AAO) of symptomatic disease and a Kaplan-Meier analysis of disease symptom event-free survival was performed.RESULTS:
Twenty-nine different RPE65 variants were identified in our cohort, 7 of them novel. Patients carrying two missense alleles showed a later disease onset than those with 1 or 2 truncating variants (log-rank test p <0.05). While 60% of patients carrying a missense/missense genotype presented symptoms before or during the first year of life, almost all patients with at least 1 truncating allele (91%) had an AAO ≤1 year (p <0.05).CONCLUSION:
Our findings suggest an association between the type of RPE65 variant carried and AAO. These findings provide useful data on RPE65-associated IRD phenotypes and may help improve clinical and therapeutic management of these patients.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
DNA
/
Cis-trans-Isomerases
/
Genetic Association Studies
/
Retinal Dystrophies
/
Mutation
Type of study:
Clinical_trials
/
Diagnostic_studies
/
Prognostic_studies
Limits:
Adolescent
/
Adult
/
Child
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Child, preschool
/
Female
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Humans
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Infant
/
Male
Language:
En
Journal:
Exp Eye Res
Year:
2021
Document type:
Article
Affiliation country:
España