Key result
Mutations in the Kir2.6 channel associated with non-familial hypokalemic periodic paralysis reduced whole-cell currents by 43% to 100% compared with the wild type channel.
Mutations in Kir2.6 (V168M, R43C, A200P) are associated with sporadic and thyrotoxic periodic paralysis and cause loss of channel function, predisposing to hypokalemia-induced muscle inexcitability.
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KCNJ18 testing may aid sporadic hypoKPP diagnosis; leaves open causal contribution pending larger validation studies.
Cheng et al. (2011) studied Non-familial Hypokalemic Periodic Paralysis (n=4). KCNJ18 (Kir2.6) mutations vs. Wild type channel was evaluated on Whole-cell currents. Mutations in the Kir2.6 channel associated with non-familial hypokalemic periodic paralysis reduced whole-cell currents by 43% to 100% compared with the wild type channel.
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