SCN5A and long QT syndrome 3: An intriguing and widely studied mutation among the mutations in SCN5A associated with LQT3 is 1795insD, which is characterized by the insertion of 3 nucleotides (TGA) at position 5537 in the DNA sequence of the SCN5A gene, causing an insertion of aspartic acid (1795insD) in the C-terminal domain of the NaV1.5 protein [18].