17 Another study including 416 twin pairs suggested a link between host genetics to several bacterial taxa, although the overall degree of similarity between MZ and DZ twins might be of the marginal significance. 19 The largest cohort so far with 1,126 UK twin pairs observed an association between fecal microbiome taxa and genes related to diet, metabolism and olfaction. 18 Nevertheless, the exact role of environmental factors is relatively unexplored in twin cohorts, and the impact of shared household and aging, although suggested, has not been proven so far.
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Gut microbial similarity in twins is driven by shared environment and aging.
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