Episode 63: A dive into Campylobacter genomics

In this episode of the microbinfie podcast, Dr. Ozan Gundogdu provides an in-depth exploration of Campylobacter genomics, revealing the complex genetic landscape of this important foodborne pathogen.

Our guest today is Dr. Ozan Gundogdu, here for a deeper dive into the foodborne pathogen Campylobacter and how genomics has informed the field over the past 20 years since the publication of the first reference genome in 1999. Dr. Gundogdu leads the foodborne enteric pathogen group at the London School of Hygiene & Tropical Medicine, where they study the physiology and pathogenesis of Campylobacter and other related enteric microorganisms like Listeria and Vibrio.

Dr. Gundogdu's background is in molecular biology and computer science, and he completed his PhD at LSHTM (London School of Hygiene & Tropical Medicine) in 2011. For more information, you can visit his profile here.

Key Points

1. Campylobacter Genome Characteristics

• First genome sequenced in 1999 (strain NCTC1116A)
• Small genome size of 1.64 megabases with 1,654 predicted open reading frames
• Low GC content of approximately 30%
• Unique features include homopolymeric tracts enabling genetic diversity

2. Genomic Complexities and Adaptations

• Approximately 25-30% of strains have type VI secretion system
• Highly complex regulatory mechanisms for surviving non-ambient conditions
• Capable of taking up external DNA easily
• Multiple mechanisms for genetic variation and immune evasion

3. Research and Challenges

• Over 50,000 Campylobacter genomes now available
• Ongoing research into microbiome dynamics in chicken gut
• Challenges in laboratory cultivation and genome stability

Take-Home Messages

• Campylobacter's genome reveals remarkable genetic adaptability
• Genomic research is crucial for understanding pathogen behavior
• Continued investigation is needed to fully comprehend bacterial survival mechanisms