December 1992
Volume 33, Issue 13
Free
Articles  |   December 1992
X-linked retinitis pigmentosa: functional phenotype of an RP2 genotype.
Author Affiliations
  • S G Jacobson
    Department of Ophthalmology, University of Miami School of Medicine, Bascom Palmer Eye Institute, Florida 33136.
  • A J Roman
    Department of Ophthalmology, University of Miami School of Medicine, Bascom Palmer Eye Institute, Florida 33136.
  • A V Cideciyan
    Department of Ophthalmology, University of Miami School of Medicine, Bascom Palmer Eye Institute, Florida 33136.
  • M G Robey
    Department of Ophthalmology, University of Miami School of Medicine, Bascom Palmer Eye Institute, Florida 33136.
  • T Iwata
    Department of Ophthalmology, University of Miami School of Medicine, Bascom Palmer Eye Institute, Florida 33136.
  • G Inana
    Department of Ophthalmology, University of Miami School of Medicine, Bascom Palmer Eye Institute, Florida 33136.
Investigative Ophthalmology & Visual Science December 1992, Vol.33, 3481-3492. doi:
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    • Get Citation

      S G Jacobson, A J Roman, A V Cideciyan, M G Robey, T Iwata, G Inana; X-linked retinitis pigmentosa: functional phenotype of an RP2 genotype.. Invest. Ophthalmol. Vis. Sci. 1992;33(13):3481-3492.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Rod- and cone-mediated function was studied with psychophysics and electroretinography in members of an X-linked retinitis pigmentosa pedigree with the RP2 genotype. An asymptomatic hemizygote with an early stage of the disease had cone dysfunction in the mid-periphery and an abnormal cone electroretinogram (ERG); rod function was normal. Hemizygotes with more advanced disease had cone and rod dysfunction in the mid-peripheral retina and cone dysfunction in the far periphery; cone and rod ERGs were abnormal. At very advanced stages, there was an absolute mid-peripheral scotoma and marked cone and rod dysfunction in the far peripheral and central retina. Cone and rod ERGs were severely abnormal or not detectable. Heterozygotes showed tapetal-like reflexes, patches of pigmentary retinopathy, and a range of functional findings from no detectable abnormalities to moderate levels of retinal dysfunction. There were regions of normal function adjacent to dysfunctional patches that had greater cone than rod sensitivity losses or comparable cone and rod losses. The results suggest that the phenotype of this RP2 genotype of X-linked retinitis pigmentosa, unlike other forms of retinitis pigmentosa, is first expressed as a cone photoreceptor system dysfunction, and as the disease progresses, both rod and cone systems are involved.

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