Autism Spectrum Disorders and the Gut Microbiota

Area of Science:

• Microbiology
• Neuroscience
• Gastroenterology

Background:

• Emerging research suggests the gut microbiota plays a role in autism spectrum disorders (ASDs) via the gut-brain axis.
• Alterations in gut microbiota composition are linked to gastrointestinal and neurobehavioral symptoms in children with ASD.

Purpose of the Study:

• To review current knowledge on gut dysbiosis and gastrointestinal disorders in ASD.
• To assess the evidence for probiotics and non-pharmacological treatments in children with ASD.

Main Methods:

• Narrative review of existing literature.
• Analysis of studies on gut microbiota, dysbiosis, and ASD treatments.

Main Results:

• Gut dysbiosis is frequently observed in ASD, though no single microbial profile is specific to ASD.
• Dysbiosis may contribute to systemic inflammation in ASD patients with gastrointestinal comorbidities.

Conclusions:

• Probiotic administration (e.g., Bifidobacteria, Streptococci, Lactobacilli) is a promising avenue for managing ASD neurobehavioral and bowel symptoms.
• Further well-designed, randomized, placebo-controlled trials are necessary to validate probiotic efficacy, optimal strains, dosage, and treatment duration for ASD.