KCNQ1 and cardiac arrhythmia: During the post-test genetic counseling, the patient disclosed that a member of their close family had passed away “due to complications from arrhythmia.” Other patients were also found to carry variants associated with long QT or other channelopathies; patient 12 and their parent carried a pathogenic variant (c.914G > C; p.Trp305Ser; rs120074186) in the KCNQ1 gene, whilst in patient 30 we identified a potentially pathogenic variant (c.5434C > T; p.Arg1812Trp; rs121912706) in the ANK2 gene associated with sudden death of the young (Methner et al., 2016).