A1 Journal article – refereed
Ophthalmologic heterogeneity in subjects with gyrate atrophy of choroid and retina harboring the L402P mutation of ornithine aminotransferase

List of Authors: Peltola KE, Näntö-Salonen K, Heinonen OJ, Jääskeläinen S, Heinänen K, Simell O, Nikoskelainen E
Publication year: 2001
Journal: Ophthalmology: Journal of The American Academy of Ophthalmology
Journal name in source: Ophthalmology
Journal acronym: Ophthalmology
Volume number: 108
Issue number: 4
ISSN: 0161-6420

To investigate clinical variation in a genetically homogenous group of subjects with gyrate atrophy of choroid and retina with hyperornithinemia (GA). The group was made up of homozygotes and compound heterozygotes for mutation L402P in the ornithine aminotransferase (OAT) gene.\nCross-sectional study.\nThirty-five Finnish subjects (18 men) with GA with a mean age of 33 years (range, 5-74 years) carrying the Finnish founder mutation L402P.\nAll subjects were examined between 1993 and 1995. The analysis was composed of, in addition to careful clinical evaluation, studies of visual fields with Goldmann perimeter, photographing of the eye fundi, and corneal electroretinography (ERG) recordings.\nThe changes in eye fundi, visual acuity, cataract changes in the lens, visual field constriction, and ERG responses were determined.\nMyopia, early cataracts, and highly abnormal ERG were typical for the GA subjects. The changes progressed rather uniformly with age. However, visual acuity, funduscopic findings, and visual fields showed great phenotypic variation. Despite the great interindividual variation, both eyes of each subject were always similarly affected.\nThis study of 35 subjects with GA carrying a single mutation shows that the ophthalmologic symptoms and findings vary widely. The data also reveal that GA subjects are already affected by severe visual impairment in young adulthood. However, the diagnosis is often made very late.\nOBJECTIVE/PURPOSE\nDESIGN\nPARTICIPANTS\nMETHODS\nMAIN OUTCOME MEASURES\nRESULTS\nCONCLUSIONS

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