Phenotype-genotype correlations in autosomal dominant retinitis pigmentosa caused by RHO, D190N.
OBJECTIVE
To phenotype a family with RHO (Asp190Asn or D190N) dominantly inherited retinitis pigmentosa (RP) and to describe an approach to surveying affected families.


METHODS
Four patients from a family with a history of autosomal dominant RP had complete clinical examinations and underwent full-field electroretinography (ERG), fundus autofluorescence (AF) imaging, and genetic testing. One patient had microperimetry (MP) mapping.


RESULTS
The patients' ages ranged from 6 years to 47 years. The proband, the father, had fundoscopic findings typical of RP. A small hyperfluorescent ring centered at the fovea was apparent on AF. MP showed preservation of central 7 degrees of visual field within this ring. The three children were all asymptomatic with visual acuity of 20/15 in each eye. One child had mild retinal pigment epithelium migration on fundoscopy; the other two children had normal fundoscopic examinations. Two children showed increased parafoveal AF. In the two affected children, average ERG b-wave implicit times were delayed in scotopic conditions, and maximal ERG tracings had abnormal waveforms. Genetic analysis confirmed that two of three asymptomatic children carried the D190N allele.


CONCLUSIONS
Patients with RHO (D190N) autosomal dominant retinitis pigmentosa (adRP) can show classic signs of RP on fundus examination and may be able to maintain good central visual acuity into adulthood. By combining clinical examination with AF imaging and electrophysiology, it is possible to offer presymptomatic clinical evaluation to families with this RP.
Tsui
Irena
I
Department of Ophthalmology, Jules Stein Eye Institute, University of California, Los Angeles, California, USA.
Chou
Chai Lin
CL
Palmer
Neeco
N
Lin
Chyuan-Sheng
CS
Tsang
Stephen H
SH
D000293:Adolescent; D000328:Adult; D001216:Asparagine; D001224:Aspartic Acid; D002648:Child; D004596:Electroretinography; D005453:Fluorescence; D005654:Fundus Oculi; D005799:Genes, Dominant; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D009154:Mutation; D010375:Pedigree; D010641:Phenotype; D055213:Retinal Pigment Epithelium / Q000473:pathology; D012174:Retinitis Pigmentosa / Q000175:diagnosis / Q000235:genetics / Q000503:physiopathology*; D012243:Rhodopsin / Q000235:genetics*; D014792:Visual Acuity; D014794:Visual Fields; D055815:Young Adult
D001224:Aspartic Acid; D001216:Asparagine; D012243:Rhodopsin