Toronto Team Finds Autism Gene After 15-Year Search

After 15 years of searching, researchers in Toronto have found what they hoped existed but couldn't prove until now: a gene that directly influences the social and repetitive behaviors at the heart of autism.

The team at the Hospital for Sick Children analyzed genetic data from over 17,000 people, roughly half with autism and half without. What they discovered surprised even experienced geneticists.

The newly identified gene, called PTCHD1-AS, affects how brain cells strengthen and weaken their connections over time. This process, known as synaptic plasticity, is how we learn and remember things.

Dr. Stephen Scherer, who led the study published in Nature, says this is the first time scientists have found a gene uniquely linked to autism's social and behavioral traits rather than general learning or cognitive differences. That distinction matters because it means the discovery could help explain all forms of autism.

The team used whole genome sequencing technology that older methods would have missed. The findings were so unexpected that Scherer believes many scientists wouldn't have believed them without publication in one of the world's top scientific journals.

Testing in lab mice showed that disrupting PTCHD1-AS changed how brain connections adapted to new information. The same process, interestingly, is the model for how artificial intelligence neural networks function.

The Ripple Effect

This breakthrough is already changing how researchers worldwide approach autism. Scientists are pivoting their work to study these newly discovered genetic pathways, and Scherer expects industry partners to join the effort.

The SickKids team is now building a precision therapeutics program to develop treatments targeting these specific genetic and cellular pathways. While discoveries like this typically take a decade to reach patients, new technology is speeding up the timeline significantly.

The impact would be meaningful. Autism affects roughly 1 in 50 children and adults in Canada, creating widespread need for specialized support in healthcare, education, housing, and employment.

Scherer calls this discovery "the best entry point into developing therapeutics" his team could have hoped for, and they're working full steam ahead on turning scientific understanding into real help for families.