Non-Syndromic X-Linked Intellectual Disability 77, also known as mrx77, is related to intellectual developmental disorder, x-linked 77 and alpha-thalassemia/impaired intellectual development syndrome, x-linked. An important gene associated with Non-Syndromic X-Linked Intellectual Disability 77 is RPS6KA6 (Ribosomal Protein S6 Kinase A6).