Intellectual Developmental Disorder, Autosomal Recessive 5, also known as mental retardation, autosomal recessive 5, is related to intellectual developmental disorder, autosomal recessive 7 and autosomal recessive non-syndromic intellectual disability. An important gene associated with Intellectual Developmental Disorder, Autosomal Recessive 5 is NSUN2 (NOP2/Sun RNA Methyltransferase 2). Affiliated tissues include brain, and related phenotypes are hypertelorism and wide nasal bridge