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Specific deficit of the ON response in visual transmission by targeted disruption of the mGluR6 gene.

Cell | Mar 10, 1995

Taking advantage of the restricted expression of metabotropic glutamate receptor subtype 6 (mGluR6) in retinal ON bipolar cells, we generated knockout mice lacking mGluR6 expression. The homozygous mutant mice showed a loss of ON responses but unchanged OFF responses to light. The mutant mice displayed no obvious changes in retinal cell organization nor in the projection of optic fibers to the brain. Furthermore, the mGluR6-deficient mice showed visual behavioral responses to light stimulation as examined by shuttle box avoidance behavior experiments using light exposure as a conditioned stimulus. The results demonstrate that mGluR6 is essential in synaptic transmission to the ON bipolar cell and that the OFF response provides an important means for transmitting visual information.

Pubmed ID: 7889569 RIS Download

Mesh terms: Animals | Electrophysiology | Female | Male | Mice | Mice, Inbred C57BL | Mice, Knockout | Nerve Fibers | Optic Nerve | Photic Stimulation | Receptors, Metabotropic Glutamate | Retina | Synaptic Transmission | Vision, Ocular | Visual Pathways | Visual Perception

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