The aim of this case series was to assess and characterize cognitive abilities, autistic traits, and adaptive behaviour in Tatton-Brown-Rahman syndrome (TBRS). The sample included 18 individuals with a clinical and genetic diagnosis of TBRS (11 males, seven females; mean age 17y 7mo, SD 9y 5mo, range 7y 2mo-33y 10mo). The British Ability Scales, Third Edition and the Autism Diagnostic Observation Schedule, Second Edition (ADOS-2) were administered to all participants. The Social Responsiveness Scale, Second Edition and the Vineland Adaptive Behaviour Scales, Third Edition were completed by a parent/caregiver. The majority of participants (n=15) had intellectual disability and General Conceptual Ability scores ranged from 39 to 76 (mean 53.17, SD 12.13). Participants displayed a profile of better verbal ability compared with non-verbal reasoning ability and spatial ability. Autistic traits were prevalent and eight participants scored above the cut-off on the ADOS-2, although symptoms were less pronounced in older individuals. Adaptive functioning was impaired but commensurate with intellectual ability. Overall, TBRS is associated with an uneven cognitive profile and a high prevalence of autistic traits. This has implications for identifying appropriate services and support that may be beneficial for individuals with TBRS. WHAT THIS PAPER ADDS: Tatton-Brown-Rahman syndrome is associated with intellectual disability and impaired adaptive functioning. Autistic traits were prevalent within the sample. Lower intellectual ability and adaptive behaviour were associated with greater severity of autistic traits.
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