Challenging behavior in smith-lemli-opitz syndrome: Initial test of biobehavioral influences

Kurt A. Freeman, Rose Eagle, Louise S. Merkens, Darryn Sikora, Kersti Pettit-Kekel, Mina Nguyen-Driver, Robert D. Steiner

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

OBJECTIVE: To study challenging behavior (destruction, aggression, self-injury, stereotypy) in children with Smith-Lemli-Opitz syndrome (SLOS) using a biobehavioral model that helps distinguish biological from socially mediated variables influencing the behavior. BACKGROUND: SLOS is an autosomal-recessive syndrome of multiple malformations and intellectual disability resulting from a genetic error in cholesterol synthesis in all cells and tissues, including brain. The exact cause of the challenging behavior in SLOS is unclear, but defective brain cholesterol synthesis may contribute. Because the precise genetic and biochemical etiology of SLOS is known, this disorder is a good model for studying biological causes of challenging behavior. METHOD: In a preliminary application of a biobehavioral model, we studied the association between cholesterol levels (as a biochemical indicator of disease severity) and behavior subtype ("biological" vs "learned") in 13 children with SLOS. Parents completed a questionnaire that categorized challenging behavior as influenced primarily by social or nonsocial (thus, presumably biological) factors. RESULTS: The severity of the cholesterol synthesis defect correlated significantly with behavior subtype classification for 1 of 2 challenging behaviors. Greater severity of the cholesterol synthesis defect was associated with behavior being classified as primarily influenced by biological factors. CONCLUSION: The interplay between challenging behavior and defective cholesterol synthesis in SLOS may help explain biological influences on the behavior. Our findings have implications for research on the effectiveness of behavioral and medical treatments for behavioral difficulties in SLOS and other neurodevelopmental disorders.

Original languageEnglish (US)
Pages (from-to)23-29
Number of pages7
JournalCognitive and Behavioral Neurology
Volume26
Issue number1
DOIs
StatePublished - Mar 1 2013

Keywords

  • Smith-Lemli-Opitz syndrome
  • behavioral assessment
  • biobehavioral
  • challenging behavior
  • cholesterol

ASJC Scopus subject areas

  • Neuropsychology and Physiological Psychology
  • Cognitive Neuroscience
  • Psychiatry and Mental health

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