Researchers Identify Potential Therapeutic Strategy for Autism Spectrum Disorder
Two new studies published in major journals advance understanding of autism spectrum disorder (ASD) from different angles: one identifies at least two biologically distinct autism subtypes based on brain connectivity patterns, while another demonstrates that silencing a specific glycine transporter gene can reverse autism-related brain deficits in mice and human organoids. The subtype study, published in Nature Neuroscience, analyzed brain scans from 940 individuals with autism and over 1,000 neurotypical controls alongside 20 mouse models, linking hypoconnectivity to synaptic pathways and hyperconnectivity to immune-related mechanisms. The therapy study, published in Nature Communications, used antisense oligonucleotides (ASOs) to suppress the Slc6a20a/SLC6A20 glycine transporter, restoring NMDA receptor function and reversing behavioral deficits in adult mice and CRISPR-edited human cortical organoids without the dangerous side effects seen in prior approaches.
An international team led by the Italian Institute of Technology and the Child Mind Institute identified two reproducible autism subtypes by cross-referencing fMRI brain connectivity data from 940 autistic individuals with biological signatures derived from 20 mouse models. One subtype showed reduced connectivity tied to synaptic gene pathways, while the other showed elevated connectivity linked to immune-related mechanisms; together these two subtypes accounted for roughly 25% of the autistic individuals studied. The findings, published in Nature Neuroscience, represent the first systematic effort to map human brain imaging patterns back to specific biological mechanisms identified in animal models, offering a potential framework for precision medicine in autism. Separately, a team at the IBS Center for Synaptic Brain Dysfunctions published findings in Nature Communications showing that ASO-mediated suppression of the glycine transporter Slc6a20a normalizes NMDA receptor (NMDAR) hypofunction—a core pathology implicated in ASD, schizophrenia, and intellectual disability. Unlike prior approaches that targeted GlyT1, a transporter densely expressed in brainstem regions governing breathing and motor control, Slc6a20a is concentrated in the cortex and hippocampus, allowing the intervention to boost glycine levels in cognition-relevant areas without respiratory side effects. A single ASO dose remained effective for at least eight weeks in adult mice with SHANK2 and SHANK3 mutations, and the effect was replicated in CRISPR-edited human cortical organoids, with phospho-proteomic analyses revealing that the therapy normalizes aberrant protein phosphorylation patterns rather than simply altering protein levels. Both studies underscore that autism is biologically heterogeneous and that targeted, mechanism-specific interventions may offer safer and more effective routes than broad-spectrum approaches.
Limitations & open questions
The subtype study notes that the two identified subtypes represent only about 25% of the autistic individuals analyzed, leaving the biological basis of the remaining 75% unexplained. For the ASO therapy study, the research was conducted exclusively in male mice, and the abstract explicitly notes 'model-dependent rescue profiles,' meaning the intervention did not work uniformly across all autism mouse models tested—a caveat underemphasized in the secondary coverage. Neither study has yet entered human clinical trials, and long-term safety data in humans are absent.
How coverage differed
Medical Xpress and Neuroscience News both cover the ASO/SLC6A20 therapy study and frame it positively, but Neuroscience News provides substantially more technical detail and includes a Q&A format that emphasizes the therapy's advantages over prior approaches, while Medical Xpress offers a briefer, more cautious summary. SciTechDaily covers an entirely different study on autism subtypes and does not overlap with the other two sources.
What different sources said
- Medical XpressCenter
Novel therapy may reverse autism-related brain deficits, study suggests
- SciTechDailyCenter
A Surprising Discovery Suggests Autism Is Not One Condition
- Neuroscience NewsCenter
Silencing One Brain Gene May Reverse Autism Deficits
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