title: Reduced incidence of Prevotella and other fermenters in intestinal microflora of autistic children.
abstract: High proportions of autistic children suffer from gastrointestinal (GI) disorders, implying a link between autism and abnormalities in gut microbial functions. Increasing evidence from recent high-throughput sequencing analyses indicates that disturbances in composition and diversity of gut microbiome are associated with various disease conditions. However, microbiome-level studies on autism are limited and mostly focused on pathogenic bacteria. Therefore, here we aimed to define systemic changes in gut microbiome associated with autism and autism-related GI problems. We recruited 20 neurotypical and 20 autistic children accompanied by a survey of both autistic severity and GI symptoms. By pyrosequencing the V2/V3 regions in bacterial 16S rDNA from fecal DNA samples, we compared gut microbiomes of GI symptom-free neurotypical children with those of autistic children mostly presenting GI symptoms. Unexpectedly, the presence of autistic symptoms, rather than the severity of GI symptoms, was associated with less diverse gut microbiomes. Further, rigorous statistical tests with multiple testing corrections showed significantly lower abundances of the genera Prevotella, Coprococcus, and unclassified Veillonellaceae in autistic samples. These are intriguingly versatile carbohydrate-degrading and/or fermenting bacteria, suggesting a potential influence of unusual diet patterns observed in autistic children. However, multivariate analyses showed that autism-related changes in both overall diversity and individual genus abundances were correlated with the presence of autistic symptoms but not with their diet patterns. Taken together, autism and accompanying GI symptoms were characterized by distinct and less diverse gut microbial compositions with lower levels of Prevotella, Coprococcus, and unclassified Veillonellaceae.
authors.affiliation: Swette Center for Environmental Biotechnology, Biodesign Institute, Arizona State University, Tempe, Arizona, United States of America.
authors.forename: Dae-Wook
authors.initials: DW
authors.lastname: Kang
authors.forename: Jin Gyoon
authors.initials: JG
authors.lastname: Park
authors.forename: Zehra Esra
authors.initials: ZE
authors.lastname: Ilhan
authors.forename: Garrick
authors.initials: G
authors.lastname: Wallstrom
authors.forename: Joshua
authors.initials: J
authors.lastname: Labaer
authors.forename: James B
authors.initials: JB
authors.lastname: Adams
authors.forename: Rosa
authors.initials: R
authors.lastname: Krajmalnik-Brown
mesh_terms: D000293:Adolescent; D001321:Autistic Disorder / Q000150:complications* / Q000453:epidemiology*; D016866:Bacteroidaceae Infections / Q000150:complications* / Q000453:epidemiology*; D044822:Biodiversity; D002648:Child; D002675:Child, Preschool; D016000:Cluster Analysis; D005260:Female; D005767:Gastrointestinal Diseases / Q000150:complications / Q000453:epidemiology / Q000382:microbiology; D041981:Gastrointestinal Tract / Q000382:microbiology*; D006801:Humans; D015994:Incidence; D008297:Male; D054892:Metagenome; D064307:Microbiota; D010802:Phylogeny; D018720:Prevotella / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D012372:ROC Curve