X-linked retinitis pigmentosa: Functional phenotype of an RP2 genotype

S. G. Jacobson, A. J. Roman, A. V. Cideciyan, M. G. Robey, T. Iwata, George Inana

Research output: Contribution to journalArticle

17 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)3481-3492
Number of pages12
JournalInvestigative Ophthalmology and Visual Science
Volume33
Issue number13
StatePublished - Jan 1 1992

Fingerprint

Vertebrate Photoreceptor Cells
Retinitis Pigmentosa
Genotype
Phenotype
Hemizygote
Retinal Cone Photoreceptor Cells
Psychophysics
Electroretinography
Scotoma
Pedigree
Heterozygote
Reflex
Retina

Keywords

  • cone photoreceptor
  • electroretinogram
  • retinitis pigmentosa
  • rod photoreceptor
  • X chromosome

ASJC Scopus subject areas

  • Ophthalmology

Cite this

Jacobson, S. G., Roman, A. J., Cideciyan, A. V., Robey, M. G., Iwata, T., & Inana, G. (1992). X-linked retinitis pigmentosa: Functional phenotype of an RP2 genotype. Investigative Ophthalmology and Visual Science, 33(13), 3481-3492.

X-linked retinitis pigmentosa : Functional phenotype of an RP2 genotype. / Jacobson, S. G.; Roman, A. J.; Cideciyan, A. V.; Robey, M. G.; Iwata, T.; Inana, George.

In: Investigative Ophthalmology and Visual Science, Vol. 33, No. 13, 01.01.1992, p. 3481-3492.

Research output: Contribution to journalArticle

Jacobson, SG, Roman, AJ, Cideciyan, AV, Robey, MG, Iwata, T & Inana, G 1992, 'X-linked retinitis pigmentosa: Functional phenotype of an RP2 genotype', Investigative Ophthalmology and Visual Science, vol. 33, no. 13, pp. 3481-3492.
Jacobson SG, Roman AJ, Cideciyan AV, Robey MG, Iwata T, Inana G. X-linked retinitis pigmentosa: Functional phenotype of an RP2 genotype. Investigative Ophthalmology and Visual Science. 1992 Jan 1;33(13):3481-3492.
Jacobson, S. G. ; Roman, A. J. ; Cideciyan, A. V. ; Robey, M. G. ; Iwata, T. ; Inana, George. / X-linked retinitis pigmentosa : Functional phenotype of an RP2 genotype. In: Investigative Ophthalmology and Visual Science. 1992 ; Vol. 33, No. 13. pp. 3481-3492.
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