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ABSTRACT: Intestinal epithelial transcription factor HNF4A protects against microbiota-dependent spontaneous colitis associated with expansion of Akkermansia muciniphila

PROVIDER: PRJNA945427 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR23877100_1.fastq.gz	Fastqsanger.gz
	SRR23877100_2.fastq.gz	Fastqsanger.gz
	SRR23877200_1.fastq.gz	Fastqsanger.gz
	SRR23877200_2.fastq.gz	Fastqsanger.gz
	SRR23877300_1.fastq.gz	Fastqsanger.gz

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Akkermansia muciniphila

Project description:Intestinal epithelial transcription factor HNF4A protects against microbiota-dependent spontaneous colitis associated with expansion of Akkermansia muciniphila

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Interspecies commensal interactions have nonlinear impacts on host immunity

Project description:The impacts of individual commensal microbes on immunity and disease can differ dramatically depending on the surrounding microbial context, yet the specific bacterial combinations that dictate divergent immunological outcomes in humans remain largely undefined. We isolated a novel Allobaculum strain from an inflammatory bowel disease (IBD) patient that elicited antigen-specific mucosal and systemic antibody responses at homeostasis and exacerbated colitis in gnotobiotic mice. Using human microbiota-associated mouse models, we uncovered an inverse correlation between Allobaculum and the taxonomically-divergent immunostimulatory species Akkermansia muciniphila, which was also reflected in human cohorts. Co-colonization with Allobaculum and A. muciniphila reprogrammed the immune responses evoked by each microbe on its own, ameliorated Allobaculum-induced colitis, and blunted A. muciniphila-induced T and B cell responses. These studies thus identify a reciprocal ‘epistatic’ interaction between unique immunostimulatory human gut bacteria and establish a generalizable framework to dissect the role of microbial context in strain-specific microbial effects on human disease.

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Project description:Akkermansia muciniphila protects against psychological disorder-induced gut microbiota-mediated colonic mucosal barrier damage and aggravation of colitis

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Project description:Histone lysine lactylation (Klac) is a new posttranslational modification (PTM) that is installed by acetyltransferase to modulate specific immune responses1 and oncogenesis2,3. Akkermansia muciniphila (A. muciniphila) is a beneficial bacterium that blunts ulcerative colitis (UC) in a mouse model by secreting extracellular vesicles (SEVs)4. Although many histone sites are known to contain lysine lactylation, whether this modification is regulated to modulate specific biological functions by exogenous acetyltransferase or intestinal microbiota is not well understood. Here, we discovered that SEV from A. muciniphila, rather than A. muciniphila per se, has anti-Th17 (T helper 17) differentiation activity. We further screened the composition of SEV and found that Amuc_2172 is the key active component. As a GCN5-related acetyltransferase of A. muciniphila, Amuc_2172 is accessible to naïve T cells and functions as a lactylation transferase on Lys4 of histone H3. Accelerated histone H3 lactylation (H3Klac) on Lys4 competitively blocks trimethylation (H3Kme3) on Il17a loci in the process of Th17-cell differentiation. Additionally, intraperitoneal application of recombinant Amuc_2172 also inhibited Th17 and dextran sulfate sodium (DSS)-induced UC phenotypes in vivo; moreover, bioengineered Amuc_2172 showed improved colitis site delivery and higher Th17 inhibition potential compared to Amuc_2172 alone. Our study reveals not only a potential therapeutic strategy for treating colitis but also a model via which lysine lactylation is regulated by the intestinal microbiota, which may be broadly applicable to understand the crosstalk of bacteria and immunity.

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