Phenotypic variability in PRPH2 as demonstrated by a family with incomplete penetrance of autosomal dominant cone-rod dystrophy.
Doc Ophthalmol
; 146(3): 267-272, 2023 Jun.
Article
em En
| MEDLINE
| ID: mdl-36609934
ABSTRACT
INTRODUCTION:
Mutations in the peripherin-2 gene (PRPH2) are a common cause of inherited retinal dystrophies well known for their phenotypic diversity. We describe a novel presentation of the c.623G > A; p.(Gly208Asp) variant in association with cone-rod dystrophy and reduced penetrance. CASE DESCRIPTION A 39-year-old man presents with a history of decreased visual acuity, photophobia, and dyschromatopsia. Fundus examination was largely unremarkable while spectral-domain optical coherence tomography (SD-OCT) demonstrated diffuse granularity at the ellipsoid zone. Full-field electroretinogram (ffERG) revealed a cone-rod dystrophy. Genetic testing revealed a heterozygous pathogenic variant, c.623G > A; p.(Gly208Asp), in the PRPH2 gene, also found in an unaffected brother. The 50-year-old brother had no visual symptoms and no findings on fundus examination. SD-OCT showed normal retinal architecture and ffERG was within normal limits bilaterally.CONCLUSION:
This case report broadens the known phenotypic presentations of PRPH2-associated retinopathy and suggests that the PRPH2 variant c.623G > A; p.(Gly208Asp) may be associated with reduced penetrance.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Retinose Pigmentar
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Distrofias de Cones e Bastonetes
Tipo de estudo:
Diagnostic_studies
Limite:
Adult
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Humans
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Male
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Middle aged
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article