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Microbiome

Multi-level analysis of the gut–brain axis shows autism spectrum disorder-associated molecular and microbial profiles
Published: 2023
SYNOPSIS

Autism spectrum disorder (ASD) is a neurodevelopmental disorder characterized by heterogeneous cognitive, behavioral and communication impairments. Disruption of the gut–brain axis (GBA) has been implicated in ASD although with limited reproducibility across studies.

J. T. Morton, D. Jin, R. H. Mills, Y. Shao, G. Rahman, D. McDonald, Q. Zhu, M. Balaban, Y. Jiang, K. Cantrell, A. Gonzalez, J. Carmel, L. Frankiensztajn, S. Martin-Brevet, K. Berding, B. Needham, M. Fernanda Zurita, M. David, O. V. Averina, A. Kovtun, A. Noto, M. Mussap, M. Wang, D. N. Frank, G. Taroncher-Oldenburg

Autism spectrum disorder (ASD) is a neurodevelopmental disorder characterized by heterogeneous cognitive, behavioral and communication impairments. Disruption of the gut–brain axis (GBA) has been implicated in ASD although with limited reproducibility across studies. In this study, we developed a Bayesian differential ranking algorithm to identify ASD-associated molecular and taxa profiles across 10 cross-sectional microbiome datasets and 15 other datasets, including dietary patterns, metabolomics, cytokine profiles and human brain gene expression profiles. We found a functional architecture along the GBA that correlates with heterogeneity of ASD phenotypes, and it is characterized by ASD-associated amino acid, carbohydrate and lipid profiles predominantly encoded by microbial species in the genera PrevotellaBifidobacteriumDesulfovibrio and Bacteroides and correlates with brain gene expression changes, restrictive dietary patterns and pro-inflammatory cytokine profiles. The functional architecture revealed in age-matched and sex-matched cohorts is not present in sibling-matched cohorts. We also show a strong association between temporal changes in microbiome composition and ASD phenotypes. In summary, we propose a framework to leverage multi-omic datasets from well-defined cohorts and investigate how the GBA influences ASD.

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Autoimmune Diseases and Gut Symbionts: The Unpopular Liaison
Published: 2019
SYNOPSIS

Compelling data have shown that gut microbiota (GM) are closely liaised with various types of autoimmune diseases in the form of dysbiosis- alteration of individual species and/or global communities of the GM (dysbiosis) which can give rise to different outcomes of autoimmune conditions. Certainly, gut microbiome could possibly be applied as a biomarker for autoimmune diseases prediction.

CITATION
S Zulkafli Nor Effa, Shou Jin Phang, Hajar Fauzan Ahmad; Autoimmune Diseases and Gut Symbionts: The Unpopular Liaison; Malaysian Journal of Medicine and Health Sciences; 15(SUPP9): 165-172, Dec 2019.
SUMMARY

In the past few years, compelling data have shown the potential crosstalk between dysbiosis of gut microbiota (GM) and impairment of systemic immune system. Since then, ideas on how GM partake in autoimmune conditions was put forward. Although genetic variability have been proven to contribute towards the pathogenesis of autoimmune conditions, epigenetics control have gained interest among researchers. Current review highlights the crosstalk between autoimmune conditions and GM and its potential regulatory mechanisms. Convincing data from existing literature help in paving ways for more well-defined species in the future studies. The studies should focus on identifying the distinct species involve in different types of autoimmune diseases and their definitive role in autoimmunity. Ultimately, these data can be used for the advancement of therapeutic approach in personalized medicine.

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Differential immune responses and microbiota profiles in children with autism spectrum disorders and co-morbid gastrointestinal symptoms
Published: 2018
SYNOPSIS

Autistic children with gastrointestinal symptoms have an imbalance in their immune response that affects behavior and quality of life.

CITATION

Rose DR, Yang H, Serena G, Sturgeon C, Ma B, Careaga M, Hughes HK, Angkustsiri K, Rose M, Hertz-Picciotto I, Van de Water J, Hansen RL, Ravel J, Fasano A, Ashwood P. Brain, Behavior, and Immunity. 2018;70:354-368.

SUMMARY

Children with autism spectrum disorder (ASD) and concurrent gastrointestinal (GI) symptoms have a more imbalanced immune response, a more disturbed gut microbiome and worse behavioral outcomes (such as irritability, agitation, social withdrawal, lethargy, hyperactivity and noncompliance) than ASD children without GI symptoms. The study additionally looked at typically developing children with and without GI symptoms and found that ASD+GI children stood out compared to those two groups as well. Children with ASD plus GI symptoms may have a “propensity” toward leaky gut that contributes to their other symptoms and clinical outcomes.

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