Association between extreme autistic traits and intellectual disability: insights from a general population twin study.

The British Journal of Psychiatry : the Journal of Mental Science
Rosa A HoekstraAngelica Ronald

Abstract

Autism is associated with intellectual disability. The strength and origin of this association is unclear. To investigate the association between extreme autistic traits and intellectual disability in children from a community-based sample and to examine whether the association can be explained by genetic factors. Children scoring in the extreme 5% on measures of autistic traits, IQ and academic achievement were selected from 7965 7/8-year-old and 3687 9-year-old twin pairs. Phenotypic associations between extreme autistic traits and intellectual disability were compared with associations among the full-range scores. Genetic correlations were estimated using bivariate DeFries-Fulker extremes analyses. Extreme autistic traits were modestly related to intellectual disability; this association was driven by communication problems characteristic of autism. Although this association was largely explained by genetic factors, the genetic correlation between autistic traits and intellectual disability was only modest. Extreme autistic traits are substantially genetically independent of intellectual disability.

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American Journal of Medical Genetics. Part B, Neuropsychiatric Genetics : the Official Publication of the International Society of Psychiatric Genetics
Rosa A HoekstraAngelica Ronald
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