Ruminococcus bromii
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 254 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. One letter wasn’t read clearly in it, so it’s grey, not guessed. NCBI NR_025930.1
Small for a gut microbe: longer than 14% of the 2,354 we have genomes for.
41% G+C, higher than 30% of gut microbes.
To scale: if its ID gene were 1 cm long, its genome would stretch 14 meters. Yours would stretch 21 kilometers. One reference genome; strains vary. NCBI GCF_928721825.1
What it can do
- Can make lactic acid What yogurt bacteria make; other microbes turn it into butyrate.
- Can ferment fiber Breaks down dietary fiber that our own enzymes can't.
- Mixed evidence Can eat inulin A fiber in onions, garlic, leeks, chicory and bananas (also sold as FOS). Published research reports it; genome analysis found it in none of 4 genomes.
- Can eat resistant starch Starch that reaches the colon: cooled potatoes and rice, green bananas, beans.
- Can change bile acids Modifies the bile acids the liver makes to digest fat. 1 of 4 strains can
Not seen in its genomes: make butyrate, make propionate, eat pectin, use lactose, feed on gut mucus, make B vitamins, make hydrogen sulfide, make methane.
All 13 capabilities and their evidence
| Capability | Verdict | Genome analysis | Lab tests | Published research |
|---|---|---|---|---|
| Can make butyrate | Not seen | 0 of 4 genomes | — | No papers |
| Can make propionate | Not seen | 0 of 4 genomes | — | No papers |
| Can make lactic acid | Can | 4 of 4 genomes | — | Papers say yes |
| Can ferment fiber | Can | 4 of 4 genomes | — | Papers say yes |
| Can eat inulin | Mixed evidence | 0 of 4 genomes | — | Papers say yes |
| Can eat resistant starch | Can | 4 of 4 genomes | — | No papers |
| Can eat pectin | Not seen | 0 of 4 genomes | — | No papers |
| Can use lactose | Not seen | 0 of 4 genomes | — | No papers |
| Can feed on gut mucus | Not seen | 0 of 4 genomes | — | No papers |
| Can change bile acids | Some strains | 1 of 4 genomes | — | No papers |
| Can make B vitamins | Not seen | 0 of 4 genomes | — | No papers |
| Can make hydrogen sulfide | Not seen | 0 of 4 genomes | — | No papers |
| Can make methane | Not seen | 0 of 4 genomes | — | No papers |
AGORA2 (Heinken et al. 2023) via VMH, CC BY 4.0 · BacDive (DSMZ), CC BY 4.0 · NJC19 (Lim et al., Scientific Data 2020), CC0
In healthy guts
Found in 63% 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%
- 2,170 other microbes, each a sliver 56.7%
- 15.6%
On average, 1.8% of the microbes in a healthy gut: the 8th largest slice.
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 8 conditions and more common in none. 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 peopleRecent research
Source: PubMed, U.S. National Library of Medicine · 125 linked papers, last 10 years