SCN4A and sudden infant death syndrome: An independent study performed in another sample of 73 infants with SIDS reported two inherited heterozygous missense variants (p.Lys724Arg in DIIS5S6 and p.Phe103Val in N-terminus) in SCN4A in two infants, but the biophysical characterization of the variant channels has yet to be done (Rochtus et al., 2020).