SLC4A3 and Familial short QT syndrome: In addition to some mutations in the above four genes that have pathogenic effects on SQTS, three other genes reported in the literature have possible pathogenic mutations of SQTS or mutations of uncertain importance, namely the voltage-gated calcium channel subunit coding genes CACNA1C [25] and CACNB2 [26], and the anion exchange protein coding gene SLC4A3 [27].