Autism risk test is 70 percent accurate
U. MELBOURNE (AUS) — A new genetic test can predict a person’s risk of developing an autism spectrum disorder, and could allow for earlier intervention.
“This test could assist in the early detection of the condition in babies and children and help in the early management of those who become diagnosed,” says lead researcher Professor Stan Skafidas, Director of the Center for Neural Engineering at the University of Melbourne.
“It would be particularly relevant for families who have a history of autism or related conditions such as Asperger’s syndrome,” he says.
Autism affects around one in 150 births and is characterized by abnormal social interaction, impaired communication, and repetitive behaviors.
The test correctly predicted autism spectrum disorder (ASD) with more than 70 percent accuracy in people of central European descent. Ongoing validation tests are continuing including the development of accurate testing for other ethnic groups.
Clinical neuropsychologist Renee Testa from the University of Melbourne and Monash University says the test would allow clinicians to provide early interventions that may reduce behavioral and cognitive difficulties that children and adults with ASD experience.
“Early identification of risk means we can provide interventions to improve overall functioning for those affected, including families,” she says.
A genetic cause has been long sought with many genes implicated in the condition, but no single gene has been adequate for determining risk.
Using US data from 3,346 individuals with ASD and 4,165 of their relatives from Autism Genetic Resource Exchange (AGRE) and Simons Foundation Autism Research Initiative (SFARI), the researchers identified 237 genetic markers (SNPs) in 146 genes and related cellular pathways that either contribute to or protect an individual from developing ASD.
Senior author Professor Christos Pantelis of the Melbourne Neuropsychiatry Center at the University of Melbourne and Melbourne Health says the discovery of the combination of contributing and protective gene markers and their interaction had helped to develop a very promising predictive ASD test.
As reported today in Molecular Psychiatry, the test is based on measuring both genetic markers of risk and protection for ASD. The risk markers increase the score on the genetic test, while the protective markers decrease the score. The higher the overall score, the higher the individual risk.
“This has been a multidisciplinary team effort with expertise across fields providing new ways of investigating this complex condition,” Pantelis says.
The study was undertaken in collaboration with Professor Ian Everall, chair in psychiatry and Gursharan Chana from the University of Melbourne and Melbourne Health, and Daniela Zantomio from Austin Health.
The next step is to further assess the accuracy of the test by monitoring children who are not yet diagnosed over an extended study.
Source: University of Melbourne
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