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Differential effect of the rd mutation on rods and cones in the mouse retina

L D Carter-Dawson, M M LaVail, R L Sidman

    Investigative Ophthalmology & Visual Science
    |June 1, 1978
    PubMed

    Insights

    In rd/rd mice retinas, rod cell degeneration rapidly precedes slower cone cell degeneration. Cone cells show prolonged survival, with some remaining even at 18 months of age.

    Area of Science:

    • Ophthalmology
    • Genetics
    • Cell Biology

    Background:

    • Retinal degeneration is a hallmark of several inherited eye diseases.
    • Understanding the sequence of photoreceptor cell loss is crucial for developing therapeutic strategies.
    • The rd/rd mouse model exhibits inherited retinal degeneration.

    Purpose of the Study:

    • To investigate the temporal sequence of rod and cone photoreceptor cell degeneration in the rd/rd mouse retina.
    • To determine if rod degeneration precedes cone degeneration in this model.

    Main Methods:

    • Light and electron microscopy were used to examine retinal tissues.
    • Quantitative analysis of rod and cone nuclei was performed at various postnatal ages and in different retinal regions.

    Main Results:

    • Rapid and near-complete rod degeneration occurred by postnatal day 36.
    • Cone nuclei showed significantly slower degeneration, with approximately 75% remaining at postnatal day 17.
    • A small percentage of cone nuclei persisted in the posterior retina up to 18 months of age.
    • A central-to-peripheral gradient of degeneration was observed for both rod and cone cells.

    Conclusions:

    • Rod photoreceptor degeneration is a rapid process that precedes the slower degeneration of cone photoreceptors in the rd/rd mouse retina.
    • Cone photoreceptors exhibit remarkable resilience and prolonged survival in this model of inherited retinal degeneration.

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