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"The p.Q7R mutation reduced binding to the Na V 1.5 C-terminus and Na + channel current density, leading to Na + channel loss-of-function phenotype consistent with that in BrS.12, 13 Furthermore, Musa etal reported that a variation in SCN5A (p.H1849R) blocks the regulation of FGF12 and causes human arrhythmia.14 This evidence highlighted that the variations in FGF12 may affect the interaction between FGF12 and Na + channel, leading to arrhythmia."