Phototransduction in a Transgenic Mouse Model of Nougaret Night Blindness
| Autor: | Nikolai O. Artemyev, Marie E. Burns, Ching-Kang Chen, James B. Hurley, Janis Lem, Rebecca Reh, Desheng Chen, Vasily Kerov, Mustapha Moussaif, W.W. Rubin |
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| Rok vydání: | 2006 |
| Předmět: |
Genetically modified mouse
genetic structures Transgene Blotting Western Gene Expression Dark Adaptation Mice Transgenic Biology medicine.disease_cause Retina Membrane Potentials Mice Night Blindness Retinal Rod Photoreceptor Cells Electroretinography medicine Animals Transducin Eye Proteins Vision Ocular Genetics Mutation General Neuroscience Phosphodiesterase Articles Immunohistochemistry Phenotype Cell biology Mice Inbred C57BL Disease Models Animal medicine.anatomical_structure Guanosine 5'-O-(3-Thiotriphosphate) Sensory Thresholds sense organs Photic Stimulation Visual phototransduction |
| Zdroj: | Journal of Neuroscience. 26:6863-6872 |
| ISSN: | 1529-2401 0270-6474 |
| Popis: | The Nougaret form of dominant stationary night blindness is linked to a G38D mutation in the rod transducin-alpha subunit (Talpha). In this study, we have examined the mechanism of Nougaret night blindness using transgenic mice expressing TalphaG38D. The biochemical, electrophysiological, and vision-dependent behavioral analyses of the mouse model revealed a unique phenotype of reduced rod sensitivity, impaired activation, and slowed recovery of the phototransduction cascade. Two key deficiencies in TalphaG38D function, its poor ability to activate PDE6 (cGMP phosphodiesterase) and decreased GTPase activity, are found to be the major mechanisms altering visual signaling in transgenic mice. Despite these defects, rod-mediated sensitivity in heterozygous mice is not decreased to the extent seen in heterozygous Nougaret patients. |
| Databáze: | OpenAIRE |
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