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Several outcomes have been reported on the role of gut microbiota in health promotion and disease prevention. Kyotango, one of the longevity areas with various centenarians, is a provincial city located in the northern part of Kyoto Prefecture in Japan. To understand the relationship between gut microbiota and urbanization, we compared the diversity, abundance, and function of gut microbiota in older healthy subjects between Kyotango and Kyoto cities; Kyoto is an urban city located in the southern part of Kyoto Prefecture. In total, 51 subjects at Kyotango and 51 subjects at Kyoto matched by age and gender were recruited, and their fecal samples were obtained to analyze the gut microbiota using 16S rRNA gene sequencing. Principal coordinate analysis for β-diversity revealed significant differences in the gut microbiota between two cities. In contrast, the analysis of α-diversity revealed no significant differences between the groups. On comparison at the phylum levels, the abundance of Firmicutes was decreased with the urbanization, whereas that of Proteobacteria and Bacteroidetes increased. On comparison at the genus levels, with urbanization, a significant decrease was observed in Lachnospiraceae families including genus Roseburia and Coprococcus , and significant increases was observed in Bacteroides , Oscillospira , Parabacteroides , and Ruminococcus . The most markedly increased functional pathway with urbanization was lipopolysaccharide biosynthesis proteins and lipopolysaccharide biosynthesis, and decreased pathway was transporters and ABC transporters. In conclusion, the present findings indicate significant differences in the gut microbiota between the provincial city and urban cities at Kyoto Prefecture. These alterations in the microbiota may provide new insights to consider the relationship between longevity and gut microbiota.

Gut microbiota differences in elderly subjects between rural city Kyotango and urban city Kyoto: an age-gender-matched study