BACKGROUND & AIMS: Previous small studies have appraised the gut microbiome (GM) in steatosis, but large-scale studies are lacking. We studied the association of GM diversity and composition, plasma metabolites, predicted functional metagenomics and steatosis. Approach & Results This is a cross-sectional analysis of the prospective population-based Rotterdam Study. We used 16Sribosomal-RNA gene sequencing and determined taxonomy using the Silva-reference database. Alpha-and beta-diversity were calculated using Shannon-index and Bray-Curtis dissimilarities. Differences were tested across steatosis using PerMANOVA. Hepatic steatosis was diagnosed by ultrasonography. We subsequently selected genera using regularized regression. The functional metagenome was predicted based on the GM using KEGG-pathways. Serum metabolomics were assessed using high-throughput proton nuclear magnetic resonance. All analyses were adjusted for age, sex, BMI, alcohol, diet, and proton-pump inhibitors. We included 1355 participants of which 472 had steatosis. Alpha-diversity was lower in steatosis (P=1.1∙10-9 ) and beta-diversity varied across steatosis strata (P=0.001). Lasso selected 37 genera of which three remained significantly associated after adjustment (Coprococcus3: β=-65; Ruminococcus Gauvreauiigroup: β=62; and Ruminococcus Gnavusgroup: β=45, Q-value =0.037). Predicted metagenome analyses revealed that pathways of secondary bile-acid synthesis and biotin metabolism were present and D-alanine metabolism was absent in steatosis. Metabolic profiles showed positive associations for aromatic-and branched chain amino acids and glycoprotein acetyls with steatosis and R. Gnavusgroup, whereas these metabolites were inversely associated with alpha-diversity and Coprococcus3. CONCLUSIONS: We confirmed, for the first time on a large-scale, the lower microbial diversity and association of Coprococcus and Ruminococcus Gnavus with steatosis. We additionally showed that steatosis and alpha-diversity share -opposite- metabolic profiles. This article is protected by copyright. All rights reserved.
BACKGROUND & AIMS: Previous small studies have appraised the gut microbiome (GM) in steatosis, but large-scale studies are lacking. We studied the association of GM diversity and composition, plasma metabolites, predicted functional metagenomics and steatosis. Approach & Results This is a cross-sectional analysis of the prospective population-based Rotterdam Study. We used 16Sribosomal-RNA gene sequencing and determined taxonomy using the Silva-reference database. Alpha-and beta-diversity were calculated using Shannon-index and Bray-Curtis dissimilarities. Differences were tested across steatosis using PerMANOVA. Hepatic steatosis was diagnosed by ultrasonography. We subsequently selected genera using regularized regression. The functional metagenome was predicted based on the GM using KEGG-pathways. Serum metabolomics were assessed using high-throughput proton nuclear magnetic resonance. All analyses were adjusted for age, sex, BMI, alcohol, diet, and proton-pump inhibitors. We included 1355 participants of which 472 had steatosis. Alpha-diversity was lower in steatosis (P=1.1∙10-9 ) and beta-diversity varied across steatosis strata (P=0.001). Lasso selected 37 genera of which three remained significantly associated after adjustment (Coprococcus3: β=-65; Ruminococcus Gauvreauiigroup: β=62; and Ruminococcus Gnavusgroup: β=45, Q-value =0.037). Predicted metagenome analyses revealed that pathways of secondary bile-acid synthesis and biotin metabolism were present and D-alanine metabolism was absent in steatosis. Metabolic profiles showed positive associations for aromatic-and branched chain amino acids and glycoprotein acetyls with steatosis and R. Gnavusgroup, whereas these metabolites were inversely associated with alpha-diversity and Coprococcus3. CONCLUSIONS: We confirmed, for the first time on a large-scale, the lower microbial diversity and association of Coprococcus and Ruminococcus Gnavus with steatosis. We additionally showed that steatosis and alpha-diversity share -opposite- metabolic profiles. This article is protected by copyright. All rights reserved.
Entities:
Keywords:
gut microbiome; hepatic steatosis; liver stiffness; metabolomics; metagenomics
Authors: Tomas Hrncir; Lucia Hrncirova; Miloslav Kverka; Robert Hromadka; Vladimira Machova; Eva Trckova; Klara Kostovcikova; Pavlina Kralickova; Jan Krejsek; Helena Tlaskalova-Hogenova Journal: Microorganisms Date: 2021-04-29
Authors: Meredith A J Hullar; Isaac C Jenkins; Timothy W Randolph; Keith R Curtis; Kristine R Monroe; Thomas Ernst; John A Shepherd; Daniel O Stram; Iona Cheng; Bruce S Kristal; Lynne R Wilkens; Adrian Franke; Loic Le Marchand; Unhee Lim; Johanna W Lampe Journal: Gut Microbes Date: 2021 Jan-Dec
Authors: Erica Ma; Gertraud Maskarinec; Unhee Lim; Carol J Boushey; Lynne R Wilkens; V Wendy Setiawan; Loïc Le Marchand; Timothy W Randolph; Isaac C Jenkins; Keith R Curtis; Johanna W Lampe; Meredith A J Hullar Journal: Br J Nutr Date: 2021-08-09 Impact factor: 4.125