Syndromic X-Linked Intellectual Disability 14, also known as lujan fryns syndrome, is related to intellectual developmental disorder, x-linked, syndromic, lujan-fryns type and lujan syndrome, and has symptoms including constipation and seizures. An important gene associated with Syndromic X-Linked Intellectual Disability 14 is UPF3B (UPF3B Regulator Of Nonsense Mediated MRNA Decay).