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Photoreceptor calcium channels: Insight from night blindness

Published online by Cambridge University Press:  06 December 2005

CATHERINE W. MORGANS ,
PHILIPPA R. BAYLEY ,
NICHOLAS W. OESCH ,
GAOYING REN ,
LAKSHMI AKILESWARAN  and
W. ROWLAND TAYLOR
CATHERINE W. MORGANS
Affiliation:
Neurological Sciences Institute, Oregon Health and Science University, Beaverton
PHILIPPA R. BAYLEY
Affiliation:
Neurological Sciences Institute, Oregon Health and Science University, Beaverton
NICHOLAS W. OESCH
Affiliation:
Neurological Sciences Institute, Oregon Health and Science University, Beaverton
GAOYING REN
Affiliation:
Neurological Sciences Institute, Oregon Health and Science University, Beaverton
LAKSHMI AKILESWARAN
Affiliation:
Neurological Sciences Institute, Oregon Health and Science University, Beaverton
W. ROWLAND TAYLOR
Affiliation:
Neurological Sciences Institute, Oregon Health and Science University, Beaverton
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Abstract

The genetic locus for incomplete congenital stationary night blindness (CSNB2) has been identified as the CACNA1f gene, encoding the α1F calcium channel subunit, a member of the L-type family of calcium channels. The electroretinogram associated with CSNB2 implicates α1F in synaptic transmission between retinal photoreceptors and bipolar cells. Using a recently developed monoclonal antibody to α1F, we localize the channel to ribbon active zones in rod photoreceptor terminals of the mouse retina, supporting a role for α1F in mediating glutamate release from rods. Detergent extraction experiments indicate that α1F is part of a detergent-resistant active zone complex, which also includes the synaptic ribbons. Comparison of native mouse rod calcium currents with recombinant α1F currents reveals that the current–voltage relationship for the native current is shifted approximately 30 mV to more hyperpolarized potentials than for the recombinant α1F current, suggesting modulation of the native channel by intracellular factors. Lastly, we present evidence for L-type α1D calcium channel subunits in cone terminals of the mouse retina. The presence of α1D channels in cones may explain the residual visual abilities of individuals with CSNB2.

Keywords

Calcium channelCSNB2PhotoreceptorSynaptic transmissionRibbon synapse
Type
Research Article
Information
Visual Neuroscience , Volume 22 , Issue 5 , September 2005 , pp. 561 - 568
Copyright
© 2005 Cambridge University Press

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