To examine associations between vitamin A status and sleep problems, core symptoms, and clock genes in children with ASD, and to explore the mechanistic role of RARβ in regulating core clock genes, particularly focusing on its influence on sleep disturbances.
Key Findings:
Children with lower vitamin A levels exhibited more severe sleep problems and autistic symptoms, highlighting the potential impact of vitamin A on ASD.
Vitamin A levels showed a weak positive correlation with the expression of RARβ and BMAL1, suggesting a possible regulatory relationship.
RARβ knockdown reduced the expression of RARβ and clock genes in mouse brain tissue, indicating the functional role of RARβ.
RARβ was confirmed to occupy a regulatory region of the CLOCK gene, supporting its regulatory function.
Interpretation:
Vitamin A status is linked to sleep problems and symptom severity in ASD, with RARβ signaling potentially regulating clock gene expression.
Limitations:
Observational design limits causal inferences, making it difficult to establish direct relationships.
Sample size may not be representative of all children with ASD, which could affect the generalizability of the findings.
Further functional studies are needed to confirm findings and elucidate the mechanisms involved.
Conclusion:
Vitamin A levels are associated with sleep disturbances and core symptoms in ASD, suggesting a role for RARβ in regulating circadian genes, which warrants further investigation to understand the implications for treatment and management.
A small observational study in collegiate football players found microbiome associations after nonconcussive head impacts, though findings were limited by severe underpowering and high attrition
