Concept
Microbiome
The microbiome is the community of microorganisms associated with a host or environment, studied for composition and function.
Microbiomes reshape how we think about organismal biology — composition, function, and intervention.
Evidence
What the evidence shows
Drawn from 10 studies in this library. Each claim links to the studies behind it.
Multiple empirical papers in this library examine microbiome with mechanistic biological findings.
Among ~20 Bacteroidetes strains, some BSHs prefer steroid cores; BtΔ2086 loses deconjugation; colonization changes weight on high-fat diet vs WT.
Cases show B. dorei dominance prior to persistent autoantibodies (mean diagnosis age 16.8 months).
Strain-level gene content varies substantially among individuals for the same species in natural habitats.
Four of eight core gut species dropped; elevated mortality in treated bees; germ-free bees did not show the same antibiotic mortality spike.
Open questions
Where studies disagree
Open questions, not settled findings — worth knowing before you cite any one of these.
Systems and scales differ across microbiome studies (species, tissues, methods), so mechanisms should not be over-generalised.
Common misconceptions
Microbiome findings from one model organism always transfer to humans.
Model systems teach mechanism; transfer to other species is a separate empirical claim.
Exam-style questions
Short-answer questions that ask you to explain or compare, not recall.
What is Microbiome?
The microbiome is the community of microorganisms associated with a host or environment, studied for composition and function.
Why does Microbiome matter for biology undergraduates?
Microbiomes reshape how we think about organismal biology — composition, function, and intervention.
The studies
- Human body microbiome biogeography
Healthy human body sites host distinct bacterial communities across a massive 16S survey.
- Antibiotics hurt bee gut and survival
Tetracycline shrinks the honeybee gut microbiome and elevates mortality after hive return.
- Selective bacterial BSH shifts host metabolism
Bacteroides bile salt hydrolase BT2086 selectively deconjugates bile acids and alters host metabolism.
- Gut microbes, blood metabolites, and metabolic traits
In 531 METSIM men, gut microbiota associate with plasma metabolites and metabolic-syndrome-relevant traits.
- B. dorei rises before T1D autoimmunity
Bacteroides dorei dominates the gut microbiome before autoimmunity in high-risk Finnish children.
- How do gut-bacteria vesicles enter host cells?
B. thetaiotaomicron outer-membrane vesicles are taken up within minutes via dynamin-dependent endocytosis/macropinocytosis and traffic to Golgi/ER/lysosomes.
- Infant diet shapes gut–host immunity
Breast- vs formula-fed infants differ in gut microbiota and host immune gene expression.
- Pesticides reshape honey bee gut microbes
In-hive pesticide exposures change honey bee gut bacterial and fungal community composition.
- How much do gut bacterial gene contents differ?
Same gut bacterial species can differ widely in gene content across people, shaping functional individuality.
- Is the gut microbiome the same along the intestine?
Swine mucosal and luminal microbiomes differ by gut section, with distinct diversity patterns and bile-acid/SCFA environments.
Learn alongside
Flashcards
Study Microbiome properly
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