3 questions to learn if your baby's gut is healthy.
By Andy Fell, University News - UC Davis | November 19, 2018
NEWBORN BABY JANE in Sacramento, California, might have access to the best, most modern medical care, but she’s likely missing something else: Friendly gut microbes. Uniquely adapted to human breast milk, these microbes provide optimal nutrition, keep out hostile infections, and may even stop the spread of disease.
Once common in babies, the bacterium Bifidobacterium infantis (B. infantis) has largely disappeared in Western countries. Research from the University of California, Davis, shows that this could have many consequences for health. Significantly, B. infantis could be an ally in the fight against infectious disease.
Exposure to antibiotics and other antimicrobial drugs can lead to drug-resistant “superbugs.” This threat to preventing and treating infections — known as antimicrobial resistance — is spreading globally, with resistance found in every country. It challenges standard treatment of infectious disease and makes surgery and hospital stays more risky and expensive.
Professor Bruce German of the UC Davis Food Science & Technology department has spent the past two decades studying lactation and its role in evolution. Among the findings of a group of scientists from across the campus: human milk contains a large proportion of oligosaccharides — short chains of sugar molecules — that babies can’t digest, so they “run right through them.” (If you have a certain kind of diaper-changing experience, you know what this looks like.) The question was, why? German joined with Professor Carlito Lebrilla from the UC Davis chemistry department and School of Medicine to analyze these amazingly complex oligosaccharides.
German suspected that these oligosaccharides existed to nourish bacteria, not the baby. He turned to colleague Professor David Mills, a UC Davis molecular biologist, to find out which bacteria could digest these human milk oligosaccharides.
It turns out that those sugar molecules are uniquely designed to feed just one bacterial species, B. infantis, and the bacteria is well-adapted to thrive on them. What’s more, this bacterium doesn’t carry antibiotic resistance genes and colonizes babies’ guts rapidly, crowding out other bacteria that can carry resistance genes. Because of this, Dr. Diana Taft, an NIH-funded postdoctoral research fellow in Mills’ lab, describes it as “a gatekeeper.”
To understand the real-world impact of B. infantis, Taft and Mills went on to examine data from two cohorts of babies: a group of almost 300 babies in Bangladesh, and about 100 in Sweden. What they found was revelatory: babies with higher gut levels of B. infantis had fewer antimicrobial resistant genes in their bodies....Read more on ucdavis.edu
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