Host-pathobiont interactions in Crohn's disease

Area of Science:

• Microbiology
• Gastroenterology
• Immunology

Background:

• The mammalian intestine hosts a complex gut microbiota, essential for host health.
• Dysbiosis, or imbalance, in the gut microbiota is linked to inflammatory bowel diseases like Crohn's disease.
• The specific roles of pathobionts in Crohn's disease pathogenesis are not fully understood.

Purpose of the Study:

• To review the distinct niches occupied by intestinal symbionts and pathobionts.
• To explore how pathobionts trigger inflammation in Crohn's disease.
• To discuss the impact of host genetics on intestinal homeostasis and pathobiont accumulation.

Main Methods:

• Review of existing literature and animal models.
• Analysis of pathobiont localization within the intestinal environment (mucus layer, epithelium).
• Examination of host genetic factors influencing intestinal barrier function and immune response.

Main Results:

• Evidence suggests pathobionts associated with Crohn's disease reside in specific niches, such as the mucus layer or near the intestinal epithelium.
• Host genetic mutations in Crohn's disease can disrupt intestinal homeostasis, facilitating pathobiont penetration and accumulation.
• These pathobionts can trigger inflammatory responses contributing to colitis.

Conclusions:

• Pathobionts residing in specific intestinal niches play a critical role in Crohn's disease development.
• Host genetic susceptibility influences the interaction between the microbiota and the intestinal environment.
• Microbiome-based interventions offer potential for precision therapeutic strategies in Crohn's disease treatment.