Why the study?
Despite in vitro and in silico evidence implicating cardiac K+ channel dysregulation in LQTS from calmodulin missense mutations, their effects on native cardiac K+ currents remain unknown.
In a native mouse model of p.N98S-calmodulin mutation, there was no evidence of cardiac K+ channel dysregulation, challenging previous in vitro and in silico findings.
Despite in vitro and in silico evidence implicating cardiac K + channel dysregulation in LQTS associated with missense mutations in genes-encoding calmodulin, their effects on native cardiac K + currents are unknown. Using a knock-in mouse model harboring the p.N98S mutation in the Calm1 gene, we found no evidence for dysregulation of major cardiac K + channels. Although these data do not support mechanistic findings from heterologous systems, our finding impacts efforts to improve therapies for calmodulinopathies.
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Guo et al. (2024) studied Long QT syndrome (LQTS) associated with calmodulin mutations. p.N98S mutation in the Calm1 gene was evaluated on Dysregulation of major cardiac K+ channels.
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