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Clinical criteria for diagnosing autism inadequate for people with genetic conditions: study

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People with certain genetic conditions are likely to have significant symptoms of autism, even if they do not meet all diagnostic criteria, a study concludes. 

Researchers at Cardiff University say their findings show clinical services need to adapt so that people diagnosed with autism-linked genetic conditions are not denied access to vital support and interventions. 

Published in The American Journal of Psychiatry, the international study analysed data from 547 people who had been diagnosed with one of four genetic conditions, also known as copy number variants (CNVs), associated with a high chance of autism – 22q11.2 deletion, 22q11.2 duplication, 16p11.2 deletion and 16p11.2 duplication.

CNVs happen when a small section of a person’s DNA is missing or duplicated. Certain CNVs have been linked to a range of health and developmental issues. They can be inherited but can also occur at random. 

The results showed a high prevalence of autism in individuals with these four genetic conditions, ranging from 23% to 58%. The prevalence of autism in the general population is 1%. Using clinical cut-offs, the team also found 54% of people with these genetic conditions who did not meet full autism diagnostic criteria nonetheless had elevated levels of autistic symptoms. There was also considerable variability in symptoms of autism between those who had the same genetic condition.

Dr Samuel Chawner, based at Cardiff University’s MRC Centre for Neuropsychiatric Genetics and Genomics said: “Our study shows that an individualised approach is needed when assessing the needs of people with genetic conditions. Although many of those who were included in this study would not have met all of the criteria which define someone as having autism, more than half of those with these genetic conditions had significant symptoms associated with it – such as social and communication difficulties or repetitive behaviours. 

“There is a danger that being too prescriptive with how autism is diagnosed will result in these individuals slipping through the net and being denied important services. Sadly, many families we have met through doing this research describe longstanding struggles in accessing autism support for their child. This is often due to a lack of integration between genetic testing services and autism diagnosis services.

“Low awareness of genetic conditions can also be a barrier. It is important that clinicians are aware of the risk of autism associated with certain genetic conditions in order to improve opportunities for early diagnosis and support.”

Data for the study was pooled from eight clinical research centres around the world, which had used the “Autism Diagnostic Interview – Revised (ADI-R)” and IQ tests on study participants. 

The ADI-R is used internationally in research as well as in clinical settings for making autism diagnoses. It involves an interview with the parent or guardian and asks about the child’s developmental history across areas of social skills, communication skills and repetitive behaviours.

It is estimated that 15% of autistic people and 60% of people with developmental delay have a genetic condition.

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