First insights into microbial changes within an Inflammatory Bowel Disease Family Cohort study

Area of Science:

• Microbiome research
• Gastroenterology
• Human genetics

Background:

• Inflammatory Bowel Disease (IBD) affects a significant population, with a strong genetic predisposition and environmental influences.
• Understanding the gut microbiota's role in IBD pathogenesis is crucial for developing targeted therapies.
• The Kiel Inflammatory Bowel Disease (IBD) Family Cohort Study (KINDRED cohort) was established to investigate IBD development in high-risk families.

Purpose of the Study:

• To characterize factors influencing gut microbiota composition in health and IBD.
• To identify microbial dysbiosis patterns associated with IBD pathologies and inflammation.
• To assess the heritability and intrafamily transmission of gut microbial communities in the context of IBD.

Main Methods:

• Prospective cohort study design with systematic data and biosample collection from IBD patients and relatives.
• Longitudinal follow-ups to gather updated health, lifestyle, and incidence data.
• Ecological analyses combining longitudinal microbial data with anthropometric, medical, nutritional, and social information.

Main Results:

• Microbial dysbiosis metric identified generalizable community gradients across IBD cohorts.
• These gradients strongly correlated with IBD pathologies, inflammation markers (e.g., Bristol stool score, ASCA), and genetic risk.
• Fecal transit time, influenced by anthropometric/medical factors, significantly altered bacterial communities.
• IBD-specific communities characterized by Enterobacteriaceae, opportunistic Clostridia, and oral taxa.
• Early-stage IBD development showed subtle microbial and physiological changes.

Conclusions:

• IBD is associated with broad-scale ecological shifts in gut microbial communities, indicating drastic state transitions.
• These microbial patterns are universal across cohorts and influence inflammation.
• Gut microbial communities in IBD exhibit increased resilience but limited heritability or intrafamily transmission.