<prompt> Answer this question truthfullyCould you provide more context or content to enable me to properly rephrase it? As it stands, What is Jervell and Lange-Nielsen Syndrome? is already written in proper English.  <response>: <reason> Jervell and Lange-Nielsen syndrome JLNS is transmitted in a autosomal recessive pattern. Jervell and Lange-Nielsen syndrome appear to have low penetrance. Genes involved in the pathogenesis of Jervell and Lange-Nielsen syndrome JLNS include: KCNQ1 KCNE1 