Background The etiology of Autism Spectrum Disorder (ASD) has been recently debated
due to emerging findings on the importance of shared environmental influences. However …

Context Autism is considered the most heritable of neurodevelopmental disorders, mainly
because of the large difference in concordance rates between monozygotic and dizygotic …

Researchers continue to pursue a better understanding of the symptoms, comorbidities, and
causes of autism spectrum disorders. In this article we review more than 30 twin studies of …

Importance Most evidence to date highlights the importance of genetic influences on the
liability to autism and related traits. However, most of these findings are derived from …

BackgroundAutism spectrum disorder (ASD) is a neurodevelopmental disorder of complex
etiology. Although strong evidence supports the causal role of genetic factors, environmental …

The characterizing features of autism spectrum disorder (ASD) are continuously distributed
in nature; however, prior twin studies have not systematically incorporated this knowledge …

OBJECTIVE: This study investigated the etiology of autistic-like traits in the general
population and the etiological overlap between the three aspects of the triad of impairments …

Objective: Autism spectrum disorders are considered to be among the most heritable mental
disorders, a notion based on surprisingly sparse data from small clinical studies. Population …

Background Evidence from twin and molecular genetic studies is accumulating that Autism
Spectrum Disorder (ASD) shares substantial etiological factors with other disorders. This is …

Genetic epidemiological studies of Autism Spectrum Disorders (ASDs) based on twin pairs
ascertained from the population and thoroughly assessed to obtain a high degree of …