Analysis of Bacterial Communities during Clostridium difficile Infection in the Mouse

Infection and Immunity
Ekaterina G SemenyukAdam Driks

Abstract

Clostridium difficile infection (CDI) is a major cause of health care-associated disease. CDI initiates with ingestion of C. difficile spores, germination in the gastrointestinal (GI) tract, and then colonization of the large intestine. The interactions between C. difficile cells and other bacteria and with host mucosa during CDI remain poorly understood. Here, we addressed the hypothesis that, in a mouse model of CDI, C. difficile resides in multicellular communities (biofilms) in association with host mucosa. To do this, we paraffin embedded and then sectioned the GI tracts of infected mice at various days postinfection (p.i.). We then used fluorescent in situ hybridization (FISH) with 16S rRNA probes targeting most bacteria as well as C. difficile specifically. The results revealed that C. difficile is present as a minority member of communities in the outer (loose) mucus layer, in the cecum and colon, starting at day 1 p.i. To generate FISH probes that identify bacteria within mucus-associated communities harboring C. difficile, we characterized bacterial populations in the infected mouse GI tract using 16S rRNA gene sequence analysis of bacterial DNA prepared from intestinal content. This analysis revealed the presence of ...Continue Reading

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