Table 5.
Genes associated with LQTs.
| Gene | Phenotype | ClinGen classification |
| KCNQ1 | LQTs, JLNs | Definitive |
| KCNH2 | LQTs | Definitive |
| SCN5A | LQTs | Definitive |
| CALM1 | LQTs | Definitive |
| CALM2 | LQTs | Definitive |
| CALM3 | LQTs | Definitive |
| CACNA1C | Ts | Definitive in Ts |
| KCNE1 | LQTs, JLNs, a-LQTs | Definitive in JLNs, Strong in a-LQTs |
| KCNJ2 | ATs | Definitive in ATs |
| TRDN | Recessive LQTs | Strong |
| KCNE2 | a-LQTs | Strong |
LQTs, long QT syndrome; JLNs, Jervell Lange-Nielsen syndrome; ATs, Andersen-Tawil syndrome; a-LQTS, acquired long QT syndrome; Ts, Timothy syndrome.