Study Links X-Linked PTCHD1-AS to Autism Risk in 27 Males, With 2 Mouse Models Mirroring Core Traits
Updated
Updated · Nature.com · May 13
Study Links X-Linked PTCHD1-AS to Autism Risk in 27 Males, With 2 Mouse Models Mirroring Core Traits
5 articles · Updated · Nature.com · May 13
Whole-genome data from 9,349 autism cases and 8,332 controls identified PTCHD1-AS microdeletions in 27 males with autism, supporting the X-linked long non-coding RNA as a susceptibility gene with an odds ratio of 2.56.
Two Ptchd1-as knockout mouse models then reproduced core autism-like traits in males—reduced sociability and communication plus more repetitive grooming—while leaving cognition, locomotion and hippocampal synaptic function largely intact.
Striatal analyses pointed to the likely mechanism: sustained postnatal expression in the dorsal striatum, altered genes tied to myelination and synaptic plasticity, reduced conventional PKC isoforms, and enhanced corticostriatal LTP and LTD.
The study also found PTCHD1 expression was unchanged after PTCHD1-AS disruption, helping separate PTCHD1-AS from the nearby protein-coding gene PTCHD1, which the authors say is more linked to broader neurodevelopmental disorders and intellectual disability.
The findings expand autism genetics beyond protein-coding genes and suggest PTCHD1-AS-related striatal circuit dysfunction may contribute specifically to core social, communicative and repetitive features, especially in males.
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Landmark 2026 Study Identifies X-Linked lncRNA PTCHD1-AS as a Key Genetic Risk Factor for Autism in Males
Overview
In May 2026, researchers at Toronto’s Hospital for Sick Children published a landmark study in Nature, identifying the X-linked long non-coding RNA gene PTCHD1-AS as a crucial risk factor for autism spectrum disorder, especially in males. Previously, long non-coding RNAs like PTCHD1-AS were often overlooked because they do not code for proteins. However, recent advances in genomic technology allowed scientists to investigate these genes with greater accuracy. The study found that microdeletions in PTCHD1-AS are directly linked to autism, marking a major step forward in understanding the genetic basis of the disorder.