Alistipes dispar
What's this?
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Its ID gene: the stretch scientists read to tell microbes apart. Each bar is one letter of its DNA. Every species has its own order of letters, so the pattern works like a fingerprint. Close relatives share most of it.
16S rRNA gene, V4 region: the 253 letters between the standard primers (515F/806R), which are the same in every species. One reference sequence; strains can differ by a letter or two. NCBI NR_179296.1
Mid-sized for a gut microbe: longer than 44% of the 2,354 we have genomes for.
61% G+C, higher than 78% of gut microbes.
To scale: if its ID gene were 1 cm long, its genome would stretch 20 meters. Yours would stretch 21 kilometers. One reference genome; strains vary. NCBI GCF_006542685.1
What it can do
We don't have capability data for this microbe yet: it isn't in AGORA2's genome models, BacDive's lab tests or NJC19's published research. That's different from “not seen”: nobody has checked.
In healthy guts
Found in 16% of healthy people.
- largest Segatella copri 6.2%
- 2nd largest Phocaeicola vulgatus 5.0%
- 3rd largest Faecalibacterium prausnitzii 4.7%
- 4th largest Bacteroides uniformis 3.2%
- 5th largest Agathobacter rectalis 2.5%
- 6th largest Alistipes putredinis 2.3%
- 7th largest Bifidobacterium longum 2.1%
- 8th largest Ruminococcus bromii 1.8%
- top 10% Alistipes dispar 0.06%
- 2,169 other microbes, each a sliver 56.6%
- 15.6%
On average, 0.06% of the microbes in a healthy gut: larger than 90% of species’ slices.
Every group, drawn the same way. Only some samples record age or sex, so each group says how many people it comes from. Tap one to see it above.
In conditions
Compared with healthy people in the same studies, it’s less common in 1 condition and more common in 1 condition. Only studies that had both are counted.
A difference is an association: it doesn’t mean this microbe causes, prevents or treats any of these.
Strongest first, then the biggest gap · Each figure is 10 peopleIn studies of how people live
Higher in omnivores than vegans
Fackelmann 2025 · 21,561 people Landmark study
Higher in 5 of 5 cohorts
“Higher” is the study’s measure: on average, a bigger share of gut bacteria across everyone in the group, carriers or not. It isn’t how many people carry it. An association the authors report, measured once per person. It doesn’t mean a diet changes this microbe, or that the microbe affects health.