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- W2156859668 abstract "Light accelerates progression of retinal degeneration in many animal models of retinitis pigmentosa (RP). A sequence variant in the Rpe65 gene (Rpe65(450Leu) or Rpe65(450Met)) can act as a modulator of light-damage susceptibility in mice by influencing the kinetics of rhodopsin regeneration and thus by modulating the photon absorption. Depending on exposure duration and light intensity applied, white fluorescent light induces photoreceptor apoptosis and retinal degeneration in wild-type mice by the activation of one of two known molecular pathways. These pathways depend, respectively, on activation of the transcription factor c-Fos/AP-1 and on phototransduction activity. Here we tested Rpe65 as a genetic modifier for inherited retinal degeneration and analysed which degenerative pathway is activated in a transgenic mouse model of autosomal dominant RP. We show that retinal degeneration was reduced in mice expressing the Rpe65(450Met) variant and that these mice retained more visual pigment rhodopsin than did transgenic mice expressing the Rpe65(450Leu) variant. In addition, lack of phototransduction slowed retinal degeneration whereas ablation of c-Fos had no effect. We conclude that sequence variations in the Rpe65 gene can act as genetic modifiers in inherited retinal degeneration, presumably by regulating the daily rate of photon absorption through the modulation of rhodopsin regeneration kinetics. Increased absorption of photons and/or light sensitivity appear to accelerate retinal degeneration via an apoptotic cascade which involves phototransduction but not c-Fos." @default.
- W2156859668 created "2016-06-24" @default.
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- W2156859668 date "2006-02-01" @default.
- W2156859668 modified "2023-10-16" @default.
- W2156859668 title "<i>Rpe65</i> as a modifier gene for inherited retinal degeneration" @default.
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- W2156859668 doi "https://doi.org/10.1111/j.1460-9568.2006.04639.x" @default.
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