Gut Microbiota and Gender in Autism Spectrum Disorders.

Gender dimorphism in autism spectrum disorders (ASD) is well known; however, the reasons for gender differences in autism are poorly understood. There are several hypotheses that might explain male prevalence in ASD including increased levels of androgens, "extreme male brain," and a combination of elevated levels of prenatal testosterone in conjunction with prenatal stress. In this review, differences in the gut microbiome and metabolome in humans and animals are described to explain gender differences in individuals with ASD, effects on behavior and social interactions and the impact of antibiotics, probiotics and fecal transplants. The bidirectional relationship between sex hormones and intestinal microbiota could also be relevant. Such interactions have been described in autoimmune diseases, but thus far are not implicated in ASD. We hypothesize that similar cross-talk exists in ASD between gut microbiota and sex hormones. Since intestinal microbiota may affect behavior, it is possible that prevalence of ASD in boys may be associated with more significant changes in the intestinal microbiome than in affected girls. Copyright© Bentham Science Publishers; For any queries, please email at epub@benthamscience.net.