Mutations in the KCNQ1 gene (also known as KvLQT1 or Kv7.1) are associated with Jervell and Lange-Nielsen (JNL) syndrome (Jervell & Lange-Nielsen, 1957), the phenotypes of which include congenital deafness and long QT intervals in the cardiogram, as well as sudden infant death syndrome and Romano–Ward syndrome (Lee et al, 2000). This evidence concerns the gene KCNQ1 and sudden infant death syndrome.