Identification of Campylobacter jejuni genes involved in commensal colonization of the chick gastrointestinal tract

David R. Hendrixson, Victor J. DiRita

Research output: Contribution to journalArticlepeer-review

304 Scopus citations


Campylobacter jejuni is the leading cause of bacterial gastroenteritis in humans in developed countries throughout the world. This bacterium frequently promotes a commensal lifestyle in the gastrointestinal tracts of many animals including birds and consumption or handling of poultry meats is a prevalent source of C. jejuni for infection in humans. To understand how the bacterium promotes commensalism, we used signature-tagged transposon mutagenesis and identified 29 mutants representing 22 different genes of C. jejuni strain 81-176 involved in colonization of the chick gastrointestinal tract. Among the determinants identified were two adjacent genes, one encoding a methyl-accepting chemotaxis protein (MCP), presumably required for proper chemotaxis to a specific environmental component, and another gene encoding a putative cytochrome c peroxidase that may function to reduce periplasmic hydrogen peroxide stress during in vivo growth. Deletion of either gene resulted in attenuation for growth throughout the gastrointestinal tract. Further examination of 10 other putative MCPs or MCP-domain containing proteins of C. jejuni revealed one other required for wild-type levels of caecal colonization. This study represents one of the first genetic screens focusing on the bacterial requirements necessary for promoting commensalism in a vertebrate host.

Original languageEnglish (US)
Pages (from-to)471-484
Number of pages14
JournalMolecular Microbiology
Issue number2
StatePublished - Apr 2004

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology


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