STEEP1 and syndromic X-linked intellectual disability Nascimento type: The clinical effects of WSCD1 haploinsufficiency are unknown, whereas the deletion of CXorf56 and UBE2A was related to “Intellectual developmental disorder, X-linked 107” (#301013) and to “UBE2A deficiency syndrome” or “X-linked Nascimento-type intellectual disability syndrome” (#300860), respectively.