It has been thought previously that agricultural transitions in the past have affected the oral microbiota. A recent study has reported that rapid mutation rates within a human salivary agglutinin gene is associated with dietary changes that resulted from domestication and agricultural strategies among different populations.  The study shows that extensive CNV(Copy number of variation) of DMBT1, a rapidly mutating  human salivary agglutinin gene, which affects gene expression strongly correlates to the agricultural history of a population.

Original publication can be found here.