Researchers led by Tzyy-Nan Huang and Ming-Hui Lin at Academia Sinica in Taiwan have found that a low-dose combination of zinc, serine, and branched-chain amino acids may ease behavioral difficulties in three mouse models of autism. The study, published December 2nd in the open-access journal PLOS Biology, reports that these supplements work together to strengthen communication between neurons and lead to better social interactions in the animals.
Exploring How Nutrition Influences ASD
Autism spectrum disorder (ASD) is associated with atypical neural development that disrupts how neurons form connections. Nutrition is also recognized as a factor that can influence ASD. Zinc, serine, and branched-chain amino acids have each been linked to potential improvements in neural connectivity. The researchers proposed that combining the three could produce a stronger effect than any single nutrient and might reduce the amount of each needed. To test this, they worked with three mouse models of ASD and examined synapse-related protein levels, tracked amygdala activity using calcium imaging, and evaluated social behavior.
In their experiments, the combined supplements shifted synaptic protein expression in autistic mice so that it more closely resembled that of typical mice. The mixture also reduced the abnormal overactivity of neurons in the amygdala. Social behaviors improved as well, but only when the nutrients were given as a mixture; the same doses of individual supplements produced no measurable change. Two additional autism mouse models showed the same pattern, indicating that the three nutrients must work together to be effective at low doses.
Researchers Highlight Broader Potential of Multi-Nutrient Approaches
Yi-Ping Hsueh explained, “As hundreds of genes are implicated in autism, each with distinct molecular functions, a ‘one gene-one therapy’ approach is impractical for addressing the complexity of ASD. Our findings show that a low-dose nutrient mixture containing zinc, branched-chain amino acids (BCAAs), and serine — working synergistically to improve synaptic function and social behaviors across three ASD mouse models — offers a safer and more practical strategy for long-term, broad application, even beginning in childhood.”
Tzyy-Nan Huang, a first author of the study, added, “High doses of individual nutrient supplements such as zinc, branched-chain amino acids, and serine can improve synaptic function through different mechanisms, but low doses of any single nutrient alone are ineffective. It is exciting to see that combining these nutrients at low doses successfully restores synaptic proteomes and enhances social behaviors in three different mouse models of autism.”
Rapid Neural Circuit Changes Observed
Co-first author Ming-Hui Lin said, “I was thrilled to observe that just seven days of treatment with the nutrient mixture significantly modulated neuronal circuit activity and connectivity in real time. These results provide strong support for the beneficial effects of low-dose nutrient supplement combinations.”
This work was supported by grants from Academia Sinica, Taiwan (AS-IA-111-L01 to Y.-P.H.) and the National Science and Technology Council, Taiwan (NSTC 113-2326-B-001-008 and 114-2326-B-001-005 to Y.-P.H.). The funding organizations did not influence the study design, data collection and analysis, the decision to publish, or the preparation of the manuscript.
