A New Genetic Entry Point for Autism Traits
Researchers at The Hospital for Sick Children identified the long non-coding RNA gene PTCHD1-AS on the X chromosome as a contributor to autism traits, specifically affecting social interaction and repetitive behaviors in males without impacting cognitive functions. The study, published in *Nature*, highlights how deletions in this gene disrupt synaptic plasticity and myelination in the striatum, offering a new biological pathway for understanding ASD mechanisms.
A team led by The Hospital for Sick Children (SickKids) has discovered that deletions in the PTCHD1-AS gene, a long non-coding RNA on the X chromosome, increase susceptibility to autism spectrum disorder (ASD) in males. Unlike most ASD-linked genes, which encode proteins and affect broader developmental outcomes, PTCHD1-AS specifically influences social interaction and repetitive behaviors while leaving cognition intact. The findings, published in *Nature*, stem from analyzing genomic data of over 9,300 individuals and mouse models lacking PTCHD1-AS. Male mice showed altered social behavior and repetitive actions but retained normal attention and memory. Researchers traced these changes to disrupted synaptic plasticity and myelination in the striatum, a brain region regulating repetitive behaviors. PTCHD1-AS acts as a regulator of other genes, distinguishing it from the ~100 protein-coding genes already linked to ASD. The study suggests it may provide a new target for understanding ASD’s core traits, as current therapeutics focus on broader developmental outcomes rather than specific behavioral symptoms. Senior author Dr. Stephen Scherer emphasized the gene’s potential as a new entry point for studying ASD biology. The discovery could refine how researchers link genetic pathways to key autism traits, offering insights into why social and repetitive behaviors are central to the disorder. Approximately one in 50 Canadian children and youth have ASD, with social interaction and repetitive behaviors common across the spectrum. The research builds on prior work linking nearby protein-coding genes to ASD and intellectual disability, but PTCHD1-AS’s role in regulating gene expression offers a distinct mechanism. The study highlights the striatum’s involvement in ASD-related behaviors and connects PTCHD1-AS disruptions to reduced activity of protein kinase C in cortical-striatal circuits. This could pave the way for targeted research into modulating these pathways for therapeutic development.
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