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Our previous work revealed that unbalanced dietary intake was an important independent factor associated with constipation and gastrointestinal (GI) symptoms in children with autism spectrum disorder (ASD). Growing evidence has shown the alterations in the gut microbiota and gut microbiota-derived metabolites in ASD. However, how the altered microbiota might affect the associations between unbalanced diets and GI symptoms in ASD remains unknown. We analyzed microbiome and metabolomics data in 90 ASD and 90 typically developing (TD) children based on 16S rRNA and untargeted metabolomics, together with dietary intake and GI symptoms assessment. We found that there existed 11 altered gut microbiota (FDR-corrected P-value &lt;0.05) and 397 altered metabolites (P-value &lt;0.05) in children with ASD compared with TD children. Among the 11 altered microbiota, the  Turicibacter ,  Coprococcus 1 , and  Lachnospiraceae FCS020 group  were positively correlated with constipation (FDR-corrected P-value &lt;0.25). The Eggerthellaceae was positively correlated with total GI symptoms (FDR-corrected P-value &lt;0.25). More importantly, three increased microbiota including  Turicibacter ,  Coprococcus 1 , and Eggerthellaceae positively modulated the associations of unbalanced dietary intake with constipation and total GI symptoms, and the decreased  Clostridium sp. BR31  negatively modulated their associations in ASD children (P-value &lt;0.05). Together, the altered microbiota strengthens the relationship between unbalanced dietary intake and GI symptoms. Among the altered metabolites, ten metabolites derived from microbiota ( Turicibacter ,  Coprococcus 1 , Eggerthellaceae, and  Clostridium sp. BR31 ) were screened out, enriched in eight metabolic pathways, and were identified to correlate with constipation and total GI symptoms in ASD children (FDR-corrected P-value &lt;0.25). These metabolomics findings further support the modulating role of gut microbiota on the associations of unbalanced dietary intake with GI symptoms. Collectively, our research provides insights into the relationship between diet, the gut microbiota, and GI symptoms in children with ASD.

gut microbes

Multi-omics analyses demonstrate the modulating role of gut microbiota on the associations of unbalanced dietary intake with gastrointestinal symptoms in children with autism spectrum disorder