Key result
ClC-1 mutants M128V and E193K showed a large rightward shift in the current-voltage relationship and severe reduction in channel conductance compared to wild-type channels.
The M128V and E193K mutations in the CLCN1 gene cause a severe reduction in ClC-1 channel conductance, explaining the molecular basis for myotonia in affected patients.
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Hypothesis-generating for myotonia congenita; leaves open human validation before guiding diagnosis or therapy.
Grunnet et al. (2003) studied Myotonia congenita. ClC-1 mutants M128V and E193K vs. Wild-type ClC-1 was evaluated on Electrophysiological characteristics (current-voltage relationship, activation kinetics, reversal potential). ClC-1 mutants M128V and E193K showed a large rightward shift in the current-voltage relationship and severe reduction in channel conductance compared to wild-type channels.