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Genome analysis will reveal how bacteria in our guts make themselves at home
Date:6/30/2011

Researchers from the Institute of Food Research and The Genome Analysis Centre have published the genome sequence of a gut bacterium, to help understand how these organisms evolved their symbiotic relationships with their hosts.

The relationship between gut bacteria and the gastrointestinal tract is one of IFR's main research areas. Key to understanding the role of bacteria in establishing and maintaining gut health is knowledge of how the very close relationship between the bacteria and their hosts has evolved to be mutually beneficial to both.

One bacterial species, Lactobacillus reuteri, has been used as a model for studies in this area, and TGAC, a partner of IFR on the Norwich Research Park, has sequenced its genome, funded by the Biotechnology and Biological Sciences Research Council (BBSRC). The collaboration between the two institutes will provide new insights into the genomic basis for host adaptation of L. reuteri to the gut.

L. reuteri inhabits the gastrointestinal tract from a large host range, from humans to rodents and birds. Previous work had shown that each host species has its own subpopulation of L. reuteri strains. These strains differ slightly, and are host specific, and the differences between them are driven by evolutionary pressures from the host.

In close collaboration with IFR scientists, TGAC sequenced and assembled the genome of a L. reuteri strain obtained from pig to a high quality draft standard and also provided a full annotation. The annotation is needed to identify which genes carry out which functions in the sequence. Comparisons between different strains of L. reuteri, which have already been made available in the major international sequence databases, helped identify a set of genes unique to this particular strain.

The IFR and TGAC researchers are now hoping to use this information to elucidate exactly what it is that restricts certain
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Contact: Andrew Chapple
andrew.chapple@nbi.ac.uk
44-160-325-1490
Norwich BioScience Institutes
Source:Eurekalert

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