Key result
KCNQ2 A196V mutation decreases M-current function via a 20 mV rightward shift in activation voltage.
Why the study?
Mutations in KCNQ2 and KCNQ3 genes cause benign familial neonatal convulsions, but the functional consequences of mutations in uncharged residues in the S4 region of KCNQ2 are not fully understood.
Effect estimate: 20 mV rightward shift
Absolute Event Rate: -16.6% vs -39.7%
p-value: p=<0.05
The KCNQ2 A196V mutation causes a rightward shift in activation voltage dependence, decreasing M-current function and likely contributing to neuronal hyperexcitability in benign familial neonatal convulsions.
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KCNQ2 A196V gating defect may promote hyperexcitability; leaves open its role in benign familial neonatal convulsions pending human validation.
Soldovieri et al. (2007) studied Benign Familial Neonatal Convulsions (n=54). KCNQ2 A196V mutation vs. Wild-type KCNQ2 was evaluated on Half-activation potential (V1/2) of homomeric channels (20 mV rightward shift, p=<0.05). The KCNQ2 A196V mutation caused a 20 mV rightward shift in activation voltage dependence and atypical prepulse-dependent activation kinetics, decreasing M-current function.
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