Intellectual Developmental Disorder, Autosomal Recessive 19, is also known as mental retardation, autosomal recessive 19. An important gene associated with Intellectual Developmental Disorder, Autosomal Recessive 19 is MRT19 (Mental Retardation, Non-Syndromic, Autosomal Recessive, 19). Related phenotypes are abnormal foot morphology and delayed speech and language development