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WEBINAR SERIESHost-microbes Symbioses in Autistic Spectrum Disorders


Welcome to Episode 6 in the CosmosID Microbiome Webinar Series where we’ll be exploring host-microbe symbiosis in autism spectrum disorders.

The onset of Autistic Spectrum Disorders is not yet clearly understood. With genetic predisposition playing only a minor role, the uncontrolled increase in the incidence of autism over the past few decades strongly supports the impact of environmental factors. Sometimes considered as such, the intestinal microbiota has been suggested as a key player in the etiology of autism. Variations in the composition of the intestinal microbiota reported in subjects with ASD have however been inconsistent. Many factors may explain this, such as the heterogeneity of analytical methods.

Conversely, more than the microbiota alone, alterations in host-microbes symbiosis could act as a key determinant, as is apparently the case for many immune-mediated chronic diseases. We will examine the potential association of an altered microbiota with intestinal permeability, inflammation and oxidative stress that could link intestinal disorders to brain-centered disorders and thus modify neuronal function and development.

The association between host-microbes symbiosis and autism could reconcile a rather large set of observations among which :

  • the much higher prevalence of gastrointestinal symptoms in autism compared to the general population (more than 50% versus 10-15%)

  • the ability to induce behavioural changes by transferring of the intestinal microbiota to germ-free animals

  • the occasional impact of antibiotics or probiotics on the symptoms of autism, their progression, or their ability to alleviate behavioural or cognitive specificities.

Clearly, from nutrition to dietary supplements to more radical interventions aimed at restoring host-microbes symbiosis through microbiota transfer, biologically targeted approaches should be evaluated in terms of their potential for improvement associated with the effectiveness of behavioral approaches. This would provide unique insights, as modulation of host-microbes symbiosis could affect gut health and, in turn, facilitate the alleviation of disorders.

Joel Dore, PHD

Joël is Research Director at INRAE Micalis Institute “Food and Gut Microbiology for Human Health” ( and Scientific Director of MetaGenoPolis (, a pre-industrial demonstrator in quantitative and functional metagenomics of the national “Futures Investment” program. Gut microbial ecologist by training, Joel pioneered intestinal metagenomics towards food-microbe-host interactions as well as diagnostic applications. With > 30 years of academic research and > 220 publications (H Index 69), Joël aims to provide a better understanding of man-microbes symbiosis towards personalized preventive nutrition and precision medicine. Joel is laureate of the ERC-Advanced Homo.symbiosus ; co-founder and scientific advisor of, a startup company dedicated to provide safe and standardized microbiotherapy solutions for the reconstruction of host-microbes symbiosis in the context of programmed clinical interventions inducing dysbiosis. Member of the BoD of GMfH, Joël supports the scientific web-platform.