SCN5A and cardiac arrhythmia: Nav1.5 mutations have recently been linked to the development of atypical phenotypes associating cardiac arrhythmias and dilated cardiomyopathy (Bezzina et al., 2003; McNair et al., 2011; Laurent et al., 2012; Mann et al., 2012; Nair et al., 2012; Beckermann et al., 2014; Gosselin-Badaroudine et al., 2014; Moreau et al., 2014a, 2015).