An international research team has identified at least two distinct biological subtypes of autism based on brain connectivity, using a massive dataset of over 1,900 fMRI scans and 20 mouse models. The findings offer a path toward precision medicine by linking observable brain patterns to specific molecular mechanisms.
How the Study Worked
Co-led by Dr. Alessandro Gozzi at the Istituto Italiano di Tecnologia (IIT) and Dr. Adriana Di Martino at the Child Mind Institute, the team used mouse models as a biological “Rosetta Stone.” They first mapped how specific genetic and molecular flaws affected brain connectivity in mice, creating reference patterns. Then they analyzed human brain scans from 940 autistic individuals and over 1,000 neurotypical controls sourced from the global Autism Brain Imaging Data Exchange (ABIDE). By cross-referencing the human data with the mouse signatures, they isolated two reproducible subtypes.
The Two Subtypes
- Hypoconnectivity subtype: Characterized by reduced communication between brain regions. Gene expression analyses revealed these areas are enriched for genes involved in synaptic pathways and cellular connections.
- Hyperconnectivity subtype: Exhibited excessive signaling between brain regions, linked to immune-related systems. This group scored moderately higher on standardized autism severity measures.
Together, these two profiles accounted for roughly 25% of the individuals examined, and the patterns were consistent across multiple international research sites.
Why It Matters
For decades, autism spectrum disorder has been defined by behavioral criteria, making it hard to develop targeted treatments. This study provides brain-based biomarkers that can guide personalized care — for example, interventions aimed at synaptic function for the hypoconnectivity subtype, or immune-modulating strategies for the hyperconnectivity subtype. The work was published in Nature Neuroscience.
What You Can Do
These discoveries underscore that our brains are wired uniquely. While you can't diagnose subtypes at home, you can explore your own cognitive patterns through evidence-based tools. Stay curious about how your brain works — understanding individual differences is the first step toward optimizing your mental performance.
Source: Neuroscience News
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