Mining chicken ileal microbiota for immunomodulatory microorganisms.

Area of Science:

• Poultry immunology
• Microbiome research
• Infectious disease control

Background:

• The gut microbiota significantly influences host immune system development and pathogen resistance, particularly in early life.
• Limited research exists on the specific immunomodulatory roles of individual gut microbes or microbial communities.
• Understanding these interactions is vital for improving poultry health and production.

Purpose of the Study:

• To investigate the systemic effects of ileal microbiota on chicken immune cell development and function.
• To identify specific gut bacteria involved in modulating the avian immune system.
• To establish a foundation for targeted immunological interventions in poultry.

Main Methods:

• A time-series study design with six time points to analyze ileal microbiota succession and immune cell maturation.
• Antibiotic treatment to observe microbiota perturbation effects on immune development.
• Introduction of commensal ileal microbiota from mature birds to young chickens.
• Screening and validation of specific bacterial strains for immunomodulatory properties.

Main Results:

• Ileal microbiota succession stages are closely linked to immune cell maturation.
• Antibiotics disrupted microbiota succession, impairing immune development.
• Early exposure to mature ileal microbiota enhanced immune cell development and Salmonella Typhimurium clearance.
• Five bacterial strains (Blautia coccoides, Bacteroides xylanisolvens, Fournierella sp002159185, Romboutsia lituseburensis, and Megamonas funiformis) were identified with immunomodulatory effects.

Conclusions:

• Early gut microbiota colonization is a key driver of immune system development in chickens.
• Specific ileal bacteria possess immunomodulatory properties beneficial for poultry health.
• These findings support targeted interventions to enhance poultry immunity and combat infectious diseases.