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May 28, 2021 02:02 am

Cities Have Their Own Distinct Microbial Fingerprints

sciencehabit shares a report from Science Magazine: When Chris Mason's daughter was a toddler, he watched, intrigued, as she touched surfaces on the New York City subway. Then, one day, she licked a pole. "There was a clear microbial exchange," says Mason, a geneticist at Weill Cornell Medicine. "I desperately wanted to know what had happened." So he started swabbing the subway, sampling the microbial world that coexists with people in our transit systems. After his 2015 study revealed a wealth of previously unknown species in New York City, other researchers contacted him to contribute. Now, Mason and dozens of collaborators have released their study of subways, buses, elevated trains, and trams in 60 cities worldwide, from Baltimore to Bogota, Colombia, to Seoul, South Korea. They identified thousands of new viruses and bacteria, and found that each city has a unique microbial "fingerprint." They found that about 45% didn't match any known species: Nearly 11,000 viruses and 1,302 bacteria were new to science. The researchers also found a set of 31 species present in 97% of the samples; these formed what they called a "core" urban microbiome. A further 1145 species were present in more than 70% of samples. Samples taken from surfaces that people touch -- like railings -- were more likely to have bacteria associated with human skin, compared with surfaces like windows. Other common species in the mix were bacteria often found in soil, water, air, and dust. But the researchers also found species that were less widespread. Those gave each city a unique microbiomeâ"and helped the researchers predict, with 88% accuracy, which city random samples came from, they report today in Cell. The study's main value isn't in its findings (which are mapped here) so much as its open data, available at metagraph.ethz.ch, says Noah Fierer, a microbiologist at the University of Colorado, Boulder, who was not involved with the research. That will give other researchers the chance to delve into new questions. "Different cities have different microbial communities," Fierer says. "That's not super surprising. The question for me is, why?" Mason sees an opportunity for "awe and excitement about mass transit systems as a source of unexplored and phenomenal biodiversity." Newly discovered species have potential for drug research, he says, and wide-scale mapping and monitoring of urban microbiomes would be a boon for public health, helping researchers spot emerging pathogens early.

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