ASD Comorbidity in Fragile X Syndrome: Symptom Profile and Predictors of Symptom Severity in Adolescent and Young Adult Males

Leonard J Abbeduto, Angela John Thurman, Andrea McDuffie, Jessica Klusek, Robyn Tempero Feigles, W. Ted Brown, Danielle J Harvey, Tatyana Adayev, Giuseppe LaFauci, Carl Dobkins, Jane E. Roberts

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5 Scopus citations


Many males with FXS meet criteria for ASD. This study was designed to (1) describe ASD symptoms in adolescent and young adult males with FXS (n = 44) and (2) evaluate the contributions to ASD severity of cognitive, language, and psychiatric factors, as well as FMRP (the protein deficient in FXS). A few ASD symptoms on the ADOS-2 were universal in the sample. There was less impairment in restricted and repetitive behaviors (RRB) than in the social affective (SA) domain. The best predictor of overall ASD severity and SA severity was expressive syntactic ability. RRB severity was best predicted by the psychiatric factors. Implications for clinical practice and for understanding the ASD comorbidity in FXS are discussed.

Original languageEnglish (US)
JournalJournal of Autism and Developmental Disorders
StateAccepted/In press - Jan 1 2018



  • Autism spectrum disorder
  • FMRP
  • Fragile X syndrome
  • IQ
  • Language
  • Psychiatric symptoms

ASJC Scopus subject areas

  • Developmental and Educational Psychology

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