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Variable Expressivity in a Japanese Family With Autosomal Dominant Retinitis Pigmentosa Closely Linked to Chromosome 19q
Mitsuru Nakazawa, MD;
Suying Xu, MD;
Andreas Gal, MD;
Yuko Wada, MD;
Makoto Tamai, MD
Arch Ophthalmol. 1996;114(3):318-322.
Abstract
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Objective
To describe the clinical features of a Japanese family with autosomal dominant retinitis pigmentosa, the locus of which has been mapped on chromosome 19q.
Design
Ophthalmologic testing, including visual acuity, slit-lamp biomicroscopy, and fundus examinations, for all family members examined. Selected members underwent kinetic visual field testing, electroretinography, and fluorescein angiography.
Patients
Eleven symptomatic members, two asymptomatic obligate carriers, and nine nonaffected members in four generations of a single family with autosomal dominant retinitis pigmentosa.
Results
Asymptomatic carriers showed mildly affected fundus and fluorescein angiographic images. Visual field testing disclosed restricted central and midperipheral fields. Electroretinograms disclosed reduced amplitudes of rod-isolated responses in both of these family members, indicating functional abnormalities.
Conclusion
Marked variability in expressivity of the retinitis pigmentosa phenotype was found in a family with autosomal dominant retinitis pigmentosa linked to chromosome 19q.
Author Affiliations
From the Department of Ophthalmology, Tohoku University School of Medicine, Sendai, Japan (Drs Nakazawa, Wada, and Tamai); and the Institut für Humangenetik, Universitäts-Krankenhaus Eppendorf, Hamburg, Germany (Drs Xu and Gal).
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