Key result
The R672S mutation in the SCN4A gene caused a hyperpolarizing shift in steady-state fast inactivation and enhanced slow inactivation, explaining hypokalemic periodic paralysis and acetazolamide worsening.
Population
A family with hypokalemic periodic paralysis and human embryonic kidney 293 cells expressing R672S mutant…
Design
Preclinical
Authors
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May guide genetic testing in hypokalemic periodic paralysis families; leaves open therapeutic translation pending larger validation studies.
The R672S mutation in the SCN4A gene alters sodium channel inactivation, providing a potential mechanism for hypokalemic periodic paralysis and its exacerbation by acetazolamide.
Bendahhou et al. (2001) studied Hypokalemic periodic paralysis. R672S mutation in SCN4A gene was evaluated on Channel inactivation defects (steady-state fast inactivation and slow inactivation). The R672S mutation in the SCN4A gene caused a hyperpolarizing shift in steady-state fast inactivation and enhanced slow inactivation, explaining hypokalemic periodic paralysis and acetazolamide worsening.
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