Comparative analysis of Campylobacter populations within individual market-age broilers using Fla gene typing method

Area of Science:

• Microbiology
• Genetics
• Immunology

Background:

• Campylobacter species are leading causes of human gastrointestinal infections.
• Poultry serves as a significant reservoir for Campylobacter transmission.
• Understanding Campylobacter's intestinal colonization is crucial for public health.

Purpose of the Study:

• To investigate the genetic diversity of Campylobacter populations within individual chickens.
• To analyze the nature of Campylobacter intestinal colonization in poultry.
• To explore potential immune evasion mechanisms.

Main Methods:

• Genotyping Campylobacter using short variable regions (SVR) of the flaA gene.
• DNA sequencing of SVR fragments from cecal samples of broiler chickens.
• Analysis of genetic mutations and amino acid sequence alterations.

Main Results:

• An average of 23.25% of sequenced clones exhibited mutations within individual chickens.
• Mutations displayed a random pattern, suggesting stochastic genetic changes.
• Approximately 20.57% of strains showed altered amino acid sequences, including nonsense mutations leading to truncated FlaA proteins.

Conclusions:

• Multiple Campylobacter genotypes coexist and colonize the chicken cecum.
• Truncated FlaA protein production may be a novel mechanism for immune evasion.
• This genetic diversity impacts Campylobacter's host-pathogen interactions and persistence.