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  • Title: Dominant retinitis pigmentosa associated with two rhodopsin gene mutations. Leu-40-Arg and an insertion disrupting the 5'-splice junction of exon 5.
    Author: Kim RY, al-Maghtheh M, Fitzke FW, Arden GB, Jay M, Bhattacharya SS, Bird AC.
    Journal: Arch Ophthalmol; 1993 Nov; 111(11):1518-24. PubMed ID: 8240108.
    Abstract:
    OBJECTIVE: To determine the phenotypes of two families in which retinitis pigmentosa cosegregates with a rhodopsin (RHO) gene mutation: a leucine-to-arginine change at codon 40 (Leu-40-Arg) in one family, and a 150-base pair insertion that disrupts the RHO 5'-splice junction of exon 5 in another. PATIENTS: Three affected members of each family. RESULTS: The Leu-40-Arg mutation was associated with the onset of night blindness in the first decade of life. By the fourth decade, severe retinal functional loss was evident on dark-adapted static threshold perimetry, and electroretinographic responses were absent or barely detectable. In contrast, the RHO 150-base pair insertion was associated with the later onset of mild night vision difficulties; in two individuals, mild night vision difficulties were first noticed in the second decade while a third, a 25-year-old woman, was asymptomatic. Dark-adapted static threshold perimetry of this latter individual revealed a "regional" or class 2 pattern of retinal functional loss associated with equal loss of rod and cone electroretinographic responses. CONCLUSION: The RHO Leu-40-Arg mutation causes symptomatic retinal dysfunction by the end of the first decade while the insertion disrupting the 5'-splice junction of RHO exon 5 causes later onset "regional" or class 2 retinal dysfunction.
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