FBRSL1 and syndromic intellectual disability: Interestingly, mutations in the FBRSL1 paralogue AUTS2 (NG_034133.1, activator of transcription and developmental regulator) were first described in 2013 as causative of an intellectual disability syndrome with microcephaly and, in some cases, additional features like heart defects and contractures (AUTS2 syndrome, OMIM 615834) (Beunders et al. 2013).