title: Mutation associated with an autosomal dominant cone-rod dystrophy CORD7 modifies RIM1-mediated modulation of voltage-dependent Ca2+ channels.
abstract: Genetic analyses have revealed an association between the gene encoding the Rab3A-interacting molecule (RIM1) and the autosomal dominant cone-rod dystrophy CORD7. However, the pathogenesis of CORD7 remains unclear. We recently revealed that RIM1 regulates voltage-dependent Ca(2+) channel (VDCC) currents and anchors neurotransmitter-containing vesicles to VDCCs, thereby controlling neurotransmitter release. We demonstrate here that the mouse RIM1 arginine-to-histidine substitution (R655H), which corresponds to the human CORD7 mutation, modifies RIM1 function in regulating VDCC currents elicited by the P/Q-type Ca(v)2.1 and L-type Ca(v)1.4 channels. Thus, our data can raise an interesting possibility that CORD7 phenotypes including retinal deficits and enhanced cognition are at least partly due to altered regulation of presynaptic VDCC currents.
authors.affiliation: Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, Japan.
authors.forename: Takafumi
authors.initials: T
authors.lastname: Miki
authors.forename: Shigeki
authors.initials: S
authors.lastname: Kiyonaka
authors.forename: Yoshitsugu
authors.initials: Y
authors.lastname: Uriu
authors.forename: Michel
authors.initials: M
authors.lastname: De Waard
authors.forename: Minoru
authors.initials: M
authors.lastname: Wakamori
authors.forename: Aaron M
authors.initials: AM
authors.lastname: Beedle
authors.forename: Kevin P
authors.initials: KP
authors.lastname: Campbell
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Mori
mesh_terms: D000818:Animals; D020746:Calcium Channels, L-Type / Q000235:genetics / Q000378:metabolism*; D020864:Calcium Channels, N-Type / Q000235:genetics / Q000378:metabolism*; D002460:Cell Line; D019204:GTP-Binding Proteins / Q000235:genetics* / Q000378:metabolism; D005838:Genotype; D006801:Humans; D008564:Membrane Potentials; D051379:Mice; D009154:Mutation; D010641:Phenotype; D017729:Presynaptic Terminals / Q000378:metabolism; D012174:Retinitis Pigmentosa / Q000235:genetics* / Q000378:metabolism; D014162:Transfection
chemical_list: D020746:Calcium Channels, L-Type; D020864:Calcium Channels, N-Type; D019204:GTP-Binding Proteins; C491490:Rims1 protein, mouse