Overview
- Researchers report in Nature that PTCHD1-AS, an X-linked long non-coding RNA that does not make a protein, raises autism risk in males.
- Whole-genome data from 9,349 cases and 8,332 controls flagged 27 males with X-chromosome deletions at PTCHD1-AS linked to ASD risk (odds ratio 2.56, P=0.01).
- Male mice lacking Ptchd1-as showed impaired social behavior and more repetitive actions while learning, memory, and attention stayed normal.
- The gene acts in the dorsal striatum, where disruption boosted synaptic plasticity, altered myelination, and lowered conventional protein kinase C activity in the cortex-to-striatum pathway.
- Because the gene sits on the X chromosome, males lack a second copy to offset deletions, and the team frames this as a new entry point for precision therapies pending further human validation.