Abstract
Autism spectrum disorders (ASD) have a high degree of heritability, but there is still much debate about specific causal genes and pathways. To gain insight into patterns of transmission, research has focused on the relatedness of quantitative autism traits (QAT) between family members, mostly using questionnaires. Yet, different kinds of bias may influence research results. In this paper, we focus on possible informant effects and, taking these into account, on possible intergenerational transmission of QAT. This study used multiple informant data retrieved via the Social Responsiveness Scale from 170 families with at least one member with ASD. Using intraclass correlations (ICCs) and mixed model analyses, we investigated inter-informant agreement and differences between parent and teacher reports on children and between self- and other-reports on adults. Using structural equation modelling (SEM), we investigated the relatedness of QAT between family members in ASD families. Parent–teacher agreement about social responsiveness was poor, especially for children with ASD, though agreement between parents was moderate to strong for affected and unaffected children. Agreement between self- and other-report in adult men was good, but only moderate in women. Agreement did not differ between adults with and without ASD. While accounting for informant effects, our SEM results corroborated the assortative mating theory and the intergenerational transmission of QAT from both fathers and mothers to their offspring.
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Acknowledgments
We would like to thank all participating families; V. Stevens and C. Aerts for the recruitment and assessment of the families; and all students for the accurate data-entry.
This research was supported by the research foundation flanders, FWO (Grant Number G.0609.07 to JS; BB is postdoctoral fellow of the FWO) and by a grant from the research council of the KU Leuven (IDO/08/013).
IN, JS and WD receive royalties from Hogrefe Uitgeverij for the SRS-A (although not for the questionnaires used in this research).
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The authors have no other conflicts of interest to declare.
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De la Marche, W., Noens, I., Kuppens, S. et al. Measuring quantitative autism traits in families: informant effect or intergenerational transmission?. Eur Child Adolesc Psychiatry 24, 385–395 (2015). https://doi.org/10.1007/s00787-014-0586-z
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DOI: https://doi.org/10.1007/s00787-014-0586-z