Autosomal Recessive Intellectual Developmental Disorder, also known as mental retardation, autosomal recessive, is related to intellectual developmental disorder, autosomal recessive 61 and intellectual developmental disorder, autosomal recessive 72. An important gene associated with Autosomal Recessive Intellectual Developmental Disorder is NSUN2 (NOP2/Sun RNA Methyltransferase 2). Affiliated tissues include brain.