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• W2038027706 abstract "The first mutations of the GABA(A) receptor channel linked to familial epilepsy in humans were reported in the gamma2L subunit. When expressed in Xenopus oocytes, the gamma2 subunit R43Q mutation abolished current enhancement by the benzodiazepine, diazepam, and the gamma2 subunit K289M mutation decreased current amplitudes. In this study, single channel recording and concentration jump techniques were used to evaluate the effects of these mutations on GABA(A) receptor currents from receptors expressed in human embryonic kidney cells. When co-expressed with alpha1 and beta3 subunits, the mutated gamma2 subunits did not alter current activation rates or rates or extent of desensitization during prolonged (400 ms) GABA application (1 mM). Deactivation following brief (5 ms) or prolonged (400 ms) GABA application was accelerated for the K289M, but not the R43Q mutation. Single channel analysis showed shorter mean open duration, suggesting that the faster deactivation was likely caused by altered gating efficacy. Interestingly, the R43Q mutation did not alter diazepam potentiation. However, significantly smaller current amplitudes were observed that were not explained by decreased single channel conductance or open time, suggesting this mutation resulted in reduced surface expression of functional receptors. These two gamma mutations likely produce disinhibition and familial epilepsy by distinct mechanisms, suggesting that maintenance of normal neuronal inhibition depends on both the peak amplitude of IPSCs and their time course." @default.
• W2038027706 created "2016-06-24" @default.
• W2038027706 creator A5038357518 @default.
• W2038027706 creator A5044198884 @default.
• W2038027706 creator A5048772790 @default.
• W2038027706 date "2003-11-01" @default.
• W2038027706 modified "2023-09-25" @default.
• W2038027706 title "Mutations linked to generalized epilepsy in humans reduce GABAA receptor current" @default.
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• W2038027706 doi "https://doi.org/10.1016/j.expneurol.2003.08.011" @default.
• W2038027706 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/14597328" @default.
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