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Discordant Expression in Monozygotic Twins

Kent W. Small, MD; W. Banks Anderson, Jr, MD

Arch Ophthalmol. 1991;109(10):1408-1410.

Abstract
• We studied a 43-year-old woman affected with pigmented paravenous retinochoroidal atrophy and her unaffected monozygotic twin. The affected twin had stable visual acuity (20/25), typical fundus findings, markedly constricted visual fields, abnormal color vision, and an abnormal electroretinogram, all consistent with pigmented paravenous retino-choroidal atrophy. Results of examinations and studies in her twin were entirely normal. Fingerprinting for DNA performed on the twins strongly supported monozygosity. Our findings suggest that either our patient did not inherit pigmented paravenous retinochoroidal atrophy or that an unusual (nonmendelian) genetic mechanism occurred.

Author Affiliations
From the Departments of Ophthalmology, Medical University of South Carolina, Charleston (Dr Small), and Duke University Medical Center, Durham, NC (Dr Anderson).

Footnotes
Accepted for publication April 22, 1991.

Reprint requests to Department of Ophthalmology, Medical University of South Carolina, 171 Ashley Ave, Charleston, SC 29425-2236 (Dr Small).

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