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Phenotypic variability in association with mutation in RDS/peripherin
Author(s) -
HOLDER GE,
TRAN HV,
ROBSON AG,
TAN MH,
RAMSDEN S,
BLACK GCM,
WEBSTER AR,
MOORE AT
Publication year - 2010
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.2010.4125.x
Subject(s) - peripherin , fundus (uterus) , electroretinography , ophthalmology , medicine , maculopathy , dystrophy , erg , atrophy , visual acuity , mutation , genetics , phenotype , pathology , biology , retinal , retinopathy , gene , endocrinology , diabetes mellitus
Purpose To report the clinical and electrophysiological findings associated with autosomal dominant maculopathy caused by mutations in Rds/peripherin. Methods Fifty three individuals with autosomal dominant macular dystrophy and a confirmed molecular diagnosis of Rds/peripherin mutation were ascertained between January 2002 and December 2008. International‐standard pattern and full‐field electroretinograms (PERG; ERG) were performed in 38 cases. Electro‐oculograms (EOG) were performed in 25 cases. Results Fourteen different mutations were identified in the Rds/peripherin gene; 4 of which were novel. Twenty four (45%) patients had the common p.Arg172 Trp allele. The mean age at the time of first symptoms and at diagnosis was 35.0+/‐ 2.4 and 47.1 +/‐ 1.5 years old [SEM] respectively. Mean LogMAR visual acuity at presentation was 0.5+/‐ 0.08 [SEM]. Fundus phenotypes included central atrophy (19 cases), pattern dystrophy (10 cases), maculopathy with flecks (5 cases), and adult vitellifom dystrophy (4 cases). Pattern ERG P50 reduction was seen in 75 of 76 eyes; the majority having undetectable or residual responses, including some cases with preserved visual acuity. ERG ranged from normal to severe reduction in both cone and rod driven responses and were not predictable either from the fundus appearance or from the specific mutation in Rds/peripherin; on addition, marked intra‐familial variation could be noted. Conclusion Mutations in the Rds/peripherin gene result in a wide variety of fundus and functional phenotypes. The same mutation can result in profoundly different phenotypes, even within family members.