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Shieh PB, Hu SC, Bobb K, Timmusk T, Ghosh A: Identification of a signaling pathway involved in calcium regulation of BDNF expression. Neuron 1998, 20:727-740.
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A new locus for hemiplegic migraine maps to chromosome 1q31
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Gardner K, Barmada MM, Ptacek LJ, Hoffman EP: A new locus for hemiplegic migraine maps to chromosome 1q31. Neurology 1997, 49:1231-1238.
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Gardner, K.1
Barmada, M.M.2
Ptacek, L.J.3
Hoffman, E.P.4
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Mapping of a second locus for familial hemiplegic migraine to 1q21-q23 and evidence of further heterogeneity
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Ducros A, Joutel A, Vahedi K, Cecillon M, Ferreira A, Bernard E, Verier A, Echenne B, Lopez de Munain A, Bousser MG et al.: Mapping of a second locus for familial hemiplegic migraine to 1q21-q23 and evidence of further heterogeneity. Ann Neurol 1997, 42:885-890.
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Ducros, A.1
Joutel, A.2
Vahedi, K.3
Cecillon, M.4
Ferreira, A.5
Bernard, E.6
Verier, A.7
Echenne, B.8
Lopez De Munain, A.9
Bousser, M.G.10
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50
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Episodic ataxia/myokymia syndrome is associated with point mutations in the human potassium channel gene, KCNA1
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Browne DL, Gancher ST, Nutt JG, Brunt ER, Smith EA, Kramer P, Litt M: Episodic ataxia/myokymia syndrome is associated with point mutations in the human potassium channel gene, KCNA1. Nat Genet 1994, 8:136-140.
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Smith, E.A.5
Kramer, P.6
Litt, M.7
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Ataxia and epileptic seizures in mice lacking type 1 inositol 1,4,5-trisphosphate receptor
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Matsumoto M, Nakagawa T, Inoue T, Nagata E, Tanaka K, Takano H, Minowa O, Kuno J, Sakakibara S, Yamada M et al.: Ataxia and epileptic seizures in mice lacking type 1 inositol 1,4,5-trisphosphate receptor. Nature 1996, 379:168-171.
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Matsumoto, M.1
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Nagata, E.4
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Takano, H.6
Minowa, O.7
Kuno, J.8
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The type 1 inositol 1,4,5-trisphosphate receptor gene is altered in the opisthotonos mouse
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Street VA, Bosma MM, Demas VP, Regan MR, Lin DD, Robinson LC, Agnew WS, Tempel BL: The type 1 inositol 1,4,5-trisphosphate receptor gene is altered in the opisthotonos mouse. J Neurosci 1997, 17:635-645. Many genes containing CAG repeat expansions encoding polyglutamines cause dominantly inherited neurodegenerative disorders, including Huntington's disease, dentatorubropallidoluysian atrophy, spinobulbar atrophy, and spinocerebellar ataxias. Relatively small and stable expansions of polymorphic CAG repeats in CACNA1A are associated with a progressive cerebellar syndrome of late onset now called SCA6. This is the only SCA in which the involved gene has a known function. SCA6 may not share the same mechanism as those operating in other polyglutamine disorders. Although missense mutations in CACNA1A had been thought to be associated with hemiplegic migraine, these authors identified a missence mutation causing a phenotype that overlaps with EA2 and SCA6. The authors demonstrate decreased P-type current in Purkinje cells and P-and Q-type currents in granule cells using α1A-specific autoantibodies from patients with Lambert-Eaton myasthenic syndrome, a paraneoplastic condition characterized by weakness and fatigability from impaired acetylcholine release at the neuromuscular junction. The authors propose that a 95 kDa protein that coprecipitates with the P/Q-type calcium channels is a truncated α1A subunit because it interacts with β subunits, is recognized by anti-α1A antibodies, and contains sequences present in the first two domains of α1A. Whether this protein is a proteolytic product of α1A has not been definitively ruled out however. Preliminary whole-cell recordings from rabbit α1A subunit mutants containing missense FHM mutations co-expressed with β1a and α2-δ in Xenopus oocytes show an altered rate of recovery from inactivation. Detailed whole-cell, single-channel recordings of heterologously expressed human cDNA containing FHM mutations demonstrate altered biophysical properties of the mutant gene products. The authors propose that state switching of mutant channels between normal and abnormal conductance states triggers episodic attacks, whereas mutations leading to decreased calcium entry cause cerebellar atrophy and progressive ataxia. This is the first demonstration that a defect in a gene encoding a modulatory subunit of the calcium channel complex is responsible for a mouse mutant with ataxia and seizures indistinguishable from another mouse mutant tottering, which has a defective gene encoding a pore-forming calcium channel subunit. The authors identified the underlying genetic defect in a mutant mouse with seizures. The gene product has been named γ2 because it shares structural homology with the calcium channel γ subunit in muscle. The authors demonstrated brain-specific expression of the defective gene, the product of which is predicted to increase calcium entry.
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(1997)
J Neurosci
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, pp. 635-645
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Street, V.A.1
Bosma, M.M.2
Demas, V.P.3
Regan, M.R.4
Lin, D.D.5
Robinson, L.C.6
Agnew, W.S.7
Tempel, B.L.8
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