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X-linked retinitis pigmentosa.

A C Bird

    The British Journal of Ophthalmology
    |April 1, 1975
    PubMed
    Summary

    X-linked retinitis pigmentosa is a common inherited eye disease, distinct from choroideremia. Heterozygous females show unique ocular changes, differing from affected males.

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    Area of Science:

    • Ophthalmology
    • Genetics
    • Retinal Degenerative Diseases

    Background:

    • Retinitis pigmentosa (RP) is a group of inherited retinal diseases.
    • The genetic basis and prevalence of different RP forms require further clarification.
    • X-linked inheritance patterns are significant in understanding RP transmission.

    Purpose of the Study:

    • To confirm the existence and distinctness of X-linked retinitis pigmentosa (XLRP).
    • To determine the prevalence of XLRP within a patient cohort.
    • To characterize the ocular phenotype in heterozygous females with XLRP.

    Main Methods:

    • Clinical examination of 107 patients with genetically-determined retinitis pigmentosa.
    • Provisional diagnosis of X-linked inheritance in 23 patients.
    • Detailed ocular assessments including fundus examination, visual field testing, dark adaptation, and retinal rhodopsin concentration measurements in affected males and heterozygous females.

    Main Results:

    • X-linked retinitis pigmentosa was confirmed as a distinct entity from choroideremia.
    • XLRP is a common form, accounting for over 20% of RP cases.
    • Heterozygous females exhibit detectable ocular fundus changes, including peripheral retinal pigment epithelial atrophy, and distinct patterns of retinal dysfunction compared to males.

    Conclusions:

    • X-linked retinitis pigmentosa is a prevalent and distinct genetic form of RP.
    • Heterozygous females manifest unique and detectable ocular abnormalities, suggesting a qualitatively different disease presentation than in males.
    • Further research is needed to identify the specific genes and understand the variability in disease severity among heterozygotes.

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