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“We don’t understand what it is about this disorder that predisposes boys as compared to girls to develop autism,” said Abel. This male bias is also seen in other neurodevelopmental disorders, like attention deficit hyperactivity disorder (ADHD) and specific language impairments.
Nearly one in every 200 cases of autism is caused by the deletion of a section of DNA on a particular chromosome. This type of disorder is also known as a copy number variation (CNV). The mouse model of autism used by the research team is missing the same stretch of DNA.
Researchers tested the mice for abnormalities in reward- learning behaviour – learning to associate actions with rewarding outcomes. This type of learning is mediated by a part of the brain called the striatum and is disrupted in people with autism and other neurodevelopmental disorders.
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“Problems with reward learning could explain why individuals with autism don’t interact socially – because they don’t find it rewarding in the same way,” said Abel.