A major limitation of current methods of gut microbiota analysis (16S rRNA amplicon sequencing and metagenomics) is that preparing the bacterial DNA for sequencing destroys the fine spatial organization of the sample. Researchers have limited tools for 3-dimensional visualization of the anaerobic commensal bacteria in a living host.
Geva-Zatorsky, et al. recently reported that they used metabolic oligosaccharide engineering and click chemistry to tag several commensal bacteria, including Bacteroides fragilis, with a fluorescent marker and observe its activity in a host. Importantly, the method is bio-orthogonal: the compounds involved in tagging were sufficiently small and nonreactive that they did not interfere with processes of interest. The fluorescent labeling method was used for a variety of commensals, as well as one aerobic pathogen (Staphylococcus aureus).
The researchers investigated how B. fragilis distributed and colonized along a host’s intestine, and how it competed for a niche after co-administration with several different species of bacteria. This strategy gives researchers a new way to visualize microbial colonization and host-microbe interactions in real time.
Kristina Campbell Science writer Kristina Campbell (M.Sc.), from British Columbia (Canada), specializes in communicating about the gut microbiota, digestive health, and nutrition. Author of the best selling Well-Fed Microbiome Cookbook, her freelance work has appeared in publications around the world. Kristina joined the Gut Microbiota for Health publishing team in 2014. Find her on: Google • Twitter