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Ophthalmic Molecular Genetics
February 1998

A New 2–Base Pair Deletion in the RPGR Gene in a Black Family With X-Linked Retinitis Pigmentosa

Author Affiliations

From the Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago Eye Center, Chicago, Ill (Drs Fishman and Grover), and the Department of Ophthalmology, W. K. Kellogg Eye Center, University of Michigan, Ann Arbor (Drs Swaroop and Buraczynska and Ms Wu).

 

EDWIN M.STONEMD, PhD

Arch Ophthalmol. 1998;116(2):213-218. doi:10.1001/archopht.116.2.213
Abstract

Objective  To report the genetic and ophthalmic findings in a black family with X-linked retinitis pigmentosa resulting from a newly identified mutation in the RPGR(retinitis pigmentosa GTPase regulator) gene.

Patients  Four affected hemizygotes with retinitis pigmentosa and 2 obligate carriers were examined. Two unaffected family members, 1 woman and her unaffected son, were also examined.

Methods  Patients underwent a routine ocular examination including slitlamp examination and a dilated fundus examination. Certain patients also underwent testing with Goldmann visual field kinetic perimetry and electroretinography. DNA screening from affected male patients, 2 obligate carriers, and 2 unaffected family members was performed to determine the presence of any mutation in the RPGR gene.

Results  A 2–base pair deletion in exon 13 of the RPGR gene that creates a frameshift was found to segregate with the retinal disease in affected males and the carrier state in female heterozygotes in this family. The ophthalmic findings in hemizygotes and carriers were within the spectrum of findings characteristically noted in families with X-linked retinitis pigmentosa. In 2 obligate carriers, a tapetal-like reflex was not clinically apparent.

Conclusions  The described mutation is the first RPGR gene mutation reported in a black family. A 2–base pair deletion in exon 13 segregates with a clinical phenotype of X-linked retinitis pigmentosa.

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