Researchers in Taiwan report that a low-dose combination of zinc, serine, and branched-chain amino acids improves neural function and social behaviors across several mouse models of autism spectrum disorder. The nutrient mix, which appears to act synergistically, restores more typical synaptic protein patterns and reduces excessive activity in the amygdala, according to a study in PLOS Biology.
A research team led by Tzyy-Nan Huang and Ming-Hui Lin at Academia Sinica in Taiwan tested a nutrient mixture on mouse models exhibiting autism-like traits. The study, published on December 2 in the open-access journal PLOS Biology, examined synapse-related proteins, amygdala activity using calcium imaging, and social behaviors in the animals.
Working with three autism spectrum disorder (ASD) mouse models, the scientists found that a combined low-dose supplementation of zinc, serine, and branched-chain amino acids shifted synaptic protein expression in autistic mice toward patterns seen in typical mice. The mixture also reduced abnormal neuronal hyperactivity in the amygdala, a brain region involved in emotion and social behavior, as reported by PLOS and summarized by ScienceDaily and other outlets.
Behavioral tests showed that social interactions improved when the animals received the nutrient combination, whereas the same low doses of the individual nutrients given alone did not measurably change behavior. This pattern was reproduced in two additional ASD mouse models, indicating that the three nutrients need to act together to be effective at low doses.
Yi-Ping Hsueh, a senior author of the paper, highlighted the broader implications of the findings. “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,” Hsueh said, according to PLOS.
First author Tzyy-Nan Huang noted that higher doses of individual nutrients have previously been shown to influence synaptic function, but that the low-dose combination proved distinctive in this study. “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,” Huang said.
Co-first author Ming-Hui Lin reported that the effects on neural circuits emerged quickly. “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,” Lin said.
The authors and independent commentators have cautioned that the work was conducted entirely in mice and does not establish that the same nutrient mix would help people with autism. Experts have also noted that aspects of the experimental design, including repeated behavioral testing, could influence some of the observed effects, underscoring the need for replication and further studies in other models and eventually in humans.
According to the study and statements released by PLOS, the research was supported by grants from Academia Sinica and the National Science and Technology Council in Taiwan. The funders did not influence the study design, data collection and analysis, decision to publish, or preparation of the manuscript.
