Why the study?
Does the M1592V mutation alter the activation properties of human skeletal muscle Na+ channels compared to wild-type?
Population
Xenopus laevis oocytes expressing human skeletal muscle Na+ channel alpha-subunits with the beta1-subunit
Comparison
M1592V mutant alpha-subunits vs Human wild-type alpha-subunits
Design
Preclinical
Authors
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Supports gain-of-function mechanism in hyperkalemic periodic paralysis; leaves open in vivo validation and therapeutic translation.
Does the M1592V mutation alter the activation properties of human skeletal muscle Na+ channels compared to wild-type?
The M1592V mutation in human skeletal muscle Na+ channels causes a hyperpolarized shift in activation, leading to sustained Na+ currents that explain the phenotype of hyperkalemic periodic paralysis.
Rojas et al. (1999) studied this question.
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