GABA and glutamate measurements in temporal cortex of autistic children.
Muhammad G Saleh, Luke Bloy, Lisa Blaskey and 1 others
PMID 39529294WHAT IT FOUND
Brain scans of autistic children showed chemical differences in the right temporal lobe only.
Higher inhibitory GABA and lower excitatory glutamate levels were found there. No significant differences appeared in the left hemisphere. These biological markers do not yet translate into clinical tests or treatments.
Key findings
01The left hemisphere showed no significant group differences in GABA, Glu, or GABA/Glu levels.
02The right hemisphere showed significantly higher GABA, lower Glu, and higher GABA/Glu ratios in the autistic group compared to controls.
03Lower Glu levels in the right hemisphere of the autistic group were associated with higher Social Responsiveness Scale scores, indicating more severe social traits.
STILL TO COME
How it was doneWhat they found
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What it does not show
The study is cross-sectional, so it cannot determine if these brain chemical differences cause autism or result from it. The large voxel size used in the scan averages signals from different brain tissues, making it impossible to pinpoint exact cellular locations. The groups differed in IQ, with the autism group having lower scores on average, which may influence brain chemistry. Data from 18 hemispheric regions were excluded due to poor quality, reducing the effective sample size for some analyses. The finding linking glutamate to social scores did not remain significant after correcting for multiple statistical tests.
Declared interests
The study was supported by the National Institutes of Health. No other conflicts of interest are reported in the provided text.
The easy way to misread this
Do not interpret these brain chemical differences as a diagnostic tool or a target for immediate clinical intervention. The study describes a biological group difference, not an individual test result, and the link to symptom severity was not robust enough to survive statistical correction.