These include Klinefelter syndrome,[93, 94, 95]NRXN1 deletion,[96, 97, 98] and 15q11.2 deletion syndrome.[99] The association with seizures is of particular interest as there is evidence from our previous studies, as well as others, that seizures and epilepsy are linked to SIDS and SUDC, perhaps as a direct cause of death or perhaps because of a shared pathogenesis due to a heightened susceptibility to other conditions such as arrhythmogenic sudden cardiac death or other mechanism.[7, 41, 96, 100, 101, 102, 103, 104]. This evidence concerns the gene NRXN1 and Klinefelter syndrome.