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First Measurable Molecular Difference Found in Autistic Brains
Autistic adults show about 15% lower mGlu5 receptor availability linked to altered excitatory brain activity measured by EEG, suggesting a molecular basis for autism traits.
- Researchers found PET evidence showing about 15% lower metabotropic glutamate receptor 5 availability in autistic adults versus neurotypical control adults using tracerFPEB.
- To investigate the molecular basis of observed excitatory differences, study authors assessed glutamatergic receptor density with PET and linked it to EEG slope as an index of excitatory‑inhibitory balance.
- In the cerebral cortex, group differences were greatest and lower mGlu5 availability correlated with shallower EEG power‑spectrum slope ; multimethod evidence linked PET and EEG.
- The study suggests lower brain-wide mGlu5 availability may represent a molecular mechanism underlying altered excitatory neurotransmission and help stratify the heterogeneous autism phenotype.
- Using rigorous PET quantification, the study measured volume of distribution with equilibrium analysis and applied mixed-model analyses plus Spearman's rho correlations in a multimethod PET + EEG approach.
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Imaging Metabotropic Glutamate Receptor 5 and Excitatory Neural Activity in Autism
This brain-wide investigation of mGlu5 availability with PET revealed pervasive lower mGlu5 availability across multiple brain areas in autism. Additionally, multimethod analyses revealed associations with a noninvasive electrophysiological index of excitatory neurotransmission. These results indica …
·Washington, United States
Read Full ArticleAutistic Brains Show Measurable Molecular Shift in Glutamate Signaling
For many autistic people, a crowded cafe isn’t just noisy. Every clinking spoon sounds like a bell. Every flickering light feels like a strobe. Clinicians have diagnosed autism through behavioral observation for decades, but the biological mechanisms behind these differences have remained elusive. Now, researchers at Yale School of Medicine report a concrete molecular signature ...
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