Plasma Amino Acid Profile in Children with Autism Spectrum Disorder in Southern China: Analysis of 110 Cases.
Wen-Xiong Chen, Yi-Ru Chen, Min-Zhi Peng and 8 others
PMID 36652126WHAT IT FOUND
Children with autism showed distinct plasma amino acid levels compared to healthy controls, including elevated glutamate and reduced tryptophan.
Higher tryptophan levels were associated with greater autism severity, suggesting a potential biological marker rather than a direct cause.
Key findings
01Plasma levels of 17 amino acids differed significantly between children with ASD and healthy controls, with elevated glutamate, glutamine, and glycine, and reduced tryptophan, lysine, and histidine.
02Within the ASD group, higher plasma tryptophan levels were significantly associated with greater severity of autism, even after adjusting for age and sex.
03No significant associations were found between plasma amino acid levels and cognitive ability, adaptability, or regression in children with ASD.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study is retrospective and cross-sectional, so it cannot determine whether amino acid differences cause autism or result from it. No data was collected on the children's diet or nutritional status, which strongly influences amino acid levels. The control group consisted of children visiting for routine check-ups, who may not represent the general healthy population. The sample was limited to children aged 1 to 14 years from a single region in China, limiting generalizability. Many previous studies show inconsistent results, and this study did not measure downstream metabolites like serotonin, which are crucial for understanding the biological mechanism.
Declared interests
No specific funding sources or conflicts of interest were declared in the provided text.
The easy way to misread this
Do not interpret these amino acid differences as evidence that dietary supplements or specific diets can treat autism. The study identifies associations in a specific population but does not prove causation or therapeutic benefit.