Parabacteroides distasonis

RANK: Species

TAXONOMY: Bacteroidetes/Chlorobi group -> Bacteroidetes -> Bacteroidia -> Bacteroidales -> Porphyromonadaceae -> Parabacteroides -> Parabacteroides distasonis


Parabacteroides distasonis (also known as Bacteroides distasonis) is a member of the normal distal human gut microbiota. The distal gut microbiota contain more bacterial cells than all of our body's other microbial communities combined. More than 90% of phylogenetic types belong to two divisions, the Bacteroidetes and the Firmicutes, with the remaining types distributed among eight other divisions. P. distasonis has the smallest genome among the sequenced human gut-associated Bacteroidetes, the smallest repertoire of genes involved in environmental sensing and gene regulation and the smallest number of genes associated with carbon source degradation. It lacks many accessory hemicellulases, pectinases and polysaccharidases that target non-plant carbohydrates. Synonyms : Ristella distasonis, Pseudobacterium distasonis, NCTC 11152, JCM 5825, DSM 20701, CIP 104284, CCUG 4941, Bacteroides fragilis subsp. distasoni, Bacteroides distasonis, ATCC 8503

This species has been identified as a resident in the human gastrointestinal tract based on the phylogenetic framework of its small subunit ribosomal RNA gene sequences.[PMC 4262072]

Gut associated