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Article
January 1992

Ocular Findings Associated With Rhodopsin Gene Codon 17 and Codon 182 Transition Mutations in Dominant Retinitis Pigmentosa

Author Affiliations

From the Departments of Ophthalmology, University of Illinois at Chicago (Dr Fishman and Mr Gilbert), and University of Iowa, Iowa City (Drs Stone and Kimura); and the Department of Pediatrics, University of Iowa, Iowa City (Dr Sheffield).

Arch Ophthalmol. 1992;110(1):54-62. doi:10.1001/archopht.1992.01080130056026
Abstract

• Six members of a family with autosomal dominant retinitis pigmentosa were found to have a cytosine-to-thymine transition mutation in the second nucleotide of codon 17 in the rhodopsin gene that resulted in a threonine to methionine change. Three members from another family with autosomal dominant retinitis pigmentosa showed a guanine-to-adenine transition mutation in the first nucleotide of codon 182 in the rhodopsin gene that resulted in a glycine to serine change. Each of these two mutations presented with a similar phenotype because both showed a regional predilection for pigmentary changes to occur in the inferior part of the retina as well as field impairment predominantly in the superior hemisphere. Electroretinographic amplitudes were more substantial than usually encountered in other forms of retinitis pigmentosa, a finding consistent with the better visual prognosis in patients with either of these two mutations. This article documents the association of two similar phenotypes of autosomal dominant retinitis pigmentosa with specific gene defects at a molecular level.

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