Any Jervell and Lange-Nielsen syndrome in which the cause of the disease is a mutation in the KCNE1 gene. The disease is Jervell and Lange-Nielsen syndrome 2 (MONDO_0012871, a Monarch Disease Ontology id). Also known as: Jervell and Lange-Nielsen syndrome caused by mutation in KCNE1, Jervell and Lange-Nielsen syndrome type 2, KCNE1 Jervell and Lange-Nielsen syndrome.