Characterizing the interactions between a naturally primed immunoglobulin A and its conserved Bacteroides thetaiotaomicron species-specific epitope in gnotobiotic mice.

The Journal of Biological Chemistry
Daniel A PetersonJeffrey I Gordon

Abstract

The adaptive immune response to the human gut microbiota consists of a complex repertoire of antibodies interacting with a broad range of taxa. Fusing intestinal lamina propria lymphocytes from mice monocolonized with Bacteroides thetaiotaomicron to a myeloma fusion partner allowed us to recover hybridomas that captured naturally primed, antigen-specific antibody responses representing multiple isotypes, including IgA. One of these hybridomas, 260.8, produced a monoclonal antibody that recognizes an epitope specific for B. thetaiotaomicron isolates in a large panel of hospital- and community-acquired Bacteroides. Whole genome transposon mutagenesis revealed a 19-gene locus, involved in LPS O-antigen polysaccharide synthesis and conserved among multiple B. thetaiotaomicron isolates, that is required for 260.8 epitope expression. Mutants in this locus exhibited marked fitness defects in vitro during growth in rich medium and in gnotobiotic mice colonized with defined communities of human gut symbionts. Expression of the 260.8 epitope was sustained during 10 months of daily passage in vitro and during 14 months of monocolonization of gnotobiotic wild-type, Rag1-/-, or Myd88-/- mice. Comparison of gnotobiotic Rag1-/- mice with and ...Continue Reading

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