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30 1 Rhodopsin Mutations in Congenital Night Blindness

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cause of desensitization, the patients will never recover sensitivity similar to the Xenopus G90D rods after addition of exogenous chromophore because there is always (at best) a 1:1 molar ratio of rhodopsin to 11-cis retinal (Dowling 1960) so that in situ the RPE and retina together never recreate the experimental situation created with excess chromophore in the single-cell experiments.

30.4 Future Studies

Further work is needed to resolve the remaining uncertainties concerning the mechanisms by which rhodopsin mutations lead to night blindness. The degree to which constitutive activity is a causative factor in retinal degeneration is a matter to explore further. While some G90D rhodopsin mutation patients undergo slight degeneration with age (Sieving et al. 1995), the T94I, A295V and A292E rhodopsin mutant patients show quite minimal degeneration (Dryja et al. 1993; al-Jandal et al. 1999; Zeitz et al. 2008). K296M/E rhodopsin mutants display a high level of constitutive activity in vitro (Robinson et al. 1992), and those mutations are found in patients with ADRP (Keen et al. 1991; Sullivan et al. 1993).

Acknowledgments The authors thank T.G. Wensel and V.E. Wotring for critical comments on this manuscript. Our research is supported by grants from the EyeSight Foundation of Alabama, the Karl Kirchgessner Foundation, and by NIH grant EY019311.

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