Although our patient who has missense mutation in STK36 does not present with epilepsy at present, he might develop it in adolescence as in patient 3 in Kortum et al. Thus, concordant to previous reports, our data supports the evidence that the mutated KCNH1 is a major cause of TMBTS and ZLS, while other genes can act as disease modifying roles. This evidence concerns the gene KCNH1 and Zimmermann-Laband syndrome.