Same bacteria, but other effect on human health because of structural variation in the bacteria's genome
Genetic instability of the microbiome makes the difference for our health - health short science news

The same microbiome might act differently in different people due to instable bacterial genomes, a new study shows.

Unlike our own genetic material, the DNA of bacteria is not fixed, but changes over time due to losses, or acquirement of new bits of DNA from other microorganisms. This has now been shown to be at the basis of sugar metabolism in the gut, which might be efficient in some, but less so in others, so that people with similar life styles and the same bacteria species in the gut have different weights.

This new sort of analysis of the microbiome makes it possible to pinpoint the mechanisms underlying the presence of certain bacteria in the gut and human pathology, including cancer and diabetes.

Read the full story: Weizmann Institute
Scientific publication: Nature