Ruminococcus bromii is a keystone species for the degradation of resistant starch in the human colon
Open accessAbstract
The release of energy from particulate substrates such as dietary fiber and resistant starch (RS) in the human colon may depend on the presence of specialist primary degraders (or ‘keystone species’) within the microbial community. We have explored the roles of four dominant amylolytic bacteria found in the human colon in the degradation and utilization of resistant starches. Eubacterium rectale and Bacteroides thetaiotaomicron showed limited ability to utilize RS2- and RS3-resistant starches by comparison with Bifidobacterium adolescentis and Ruminococcus bromii. In co-culture, however, R. bromii proved unique in stimulating RS2 and RS3 utilization by the other three bacterial species, even in a medium that does not permit growth of R. bromii itself. Having previously demonstrated low RS3 fermentation in vivo in two individuals with undetectable populations of R. bromii-related bacteria, we show here that supplementation of mixed fecal bacteria from one of these volunteers with R. bromii, but not with the other three species, greatly enhanced the extent of RS3 fermentation in vitro. This argues strongly that R. bromii has a pivotal role in fermentation of RS3 in the human large intestine, and that variation in the occurrence of this species and its close relatives may be a primary cause of variable energy recovery from this important component of the diet. This work also indicates that R. bromii possesses an exceptional ability to colonize and degrade starch particles when compared with previously studied amylolytic bacteria from the human colon.
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There are many key functions that are only carried out by a relatively small number of microbiota species, with examples including oxalate and resistant-starch degradation.
“there are many key functions that are only carried out by a relatively small number of microbiota species. Examples include oxalate 31 and resistant-starch 32 degradation.”
From Human microbiome myths and misconceptions (2023) · cites this paper as [32]
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- Authors
- Ze, X., Duncan, S. H., Louis, P., & Flint, H. J.
- Affiliations
- University of Aberdeen (GB)
- Corresponding author
- Flint, Harry J
- Venue
- The ISME Journal
- Publisher
- Oxford University Press (OUP)
- Published
- 2012-02-16
- Volume
- 6
- Issue
- 8
- Pages
- 1535-1543
- ISSN
- 1751-7362 (ISSN-L)
- 1751-7370
- PMC
- PMC3400402
- OpenAlex
- W2094379365
- Cited by
- 1,060
- References
- 4
- Citations by year
- 2026: 80 · 2025: 97 · 2024: 113 · 2023: 93 · 2022: 115 · 2021: 102 · 2020: 103 · 2019: 71 · 2018: 85 · 2017: 54 · 2016: 57 · 2015: 36 · 2014: 25 · 2013: 24 · 2012: 5
- FWCI
- 11.58
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- The ISME Journal (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Rural and Environment Science and Analytical Services Division
- Scottish Government
- University of Aberdeen
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
- Health Sciences › Nursing › Nutrition and Dietetics › Food composition and properties
- Health Sciences › Nursing › Nutrition and Dietetics › Microbial Metabolites in Food Biotechnology
- Keywords
- Ruminococcus bromii, resistant starch, RS3, RS2, keystone species, amylolytic bacteria, Bifidobacterium adolescentis, Eubacterium rectale, Bacteroides thetaiotaomicron, colonic fermentation, starch degradation
- MeSH terms
- Bacteria, Colon, Feces, Fermentation, Humans, Species Specificity, Starch, Time Factors, Coculture Techniques, Ruminococcus
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