Pseudoflavonifractor

Abstract

Pseu.do.fla.vo.ni.frac'tor. Gr. adj. pseudês , false; N.L. masc. n. Flavonifractor , a bacterial genus name; N.L. masc. n. Pseudoflavonifractor , a false Flavonifractor. Firmicutes / Clostridia / Clostridiales / Oscillospiraceae / Pseudoflavonifractor Pseudoflavonifractor is a genus in the phylum Firmicutes , class Clostridia , order Clostridiales , family Oscillospiraceae . It currently comprises three species with validly published names. Pseudoflavonifractor capillosus , was proposed in 2010 to reclassify Bacteroides capillosus based on its phylogenetic position, biochemical properties, and DNA G + C content. Two other species, Pseudoflavonifractor gallinarum and Pseudoflavonifractor hominis , were described in 2021. Although phylogenetically linked to typical Gram‐positive bacteria, members of this genus stain Gram‐negative. Cells are strictly anaerobic, nonmotile, and non‐spore‐forming rods, occasionally ovoid ( P. hominis ). Optimal growth is described after at least 48 h of anaerobic incubation in nutrient‐rich broth or on sheep/horse blood agar. Colonies are minute, circular, colorless, smooth, and translucent. Members of the genus Pseudoflavonifractor are asaccharolytic although able to weakly ferment some sugars. They produce acetic and succinic acids when grown in TGY (trypticase/glucose/yeast extract) broth. The dominant fatty acids are C 14:0 and C 16:0 dimethyl acetal (DMA). They are described as members of the human and animal gut microbiota. P. capillosus has also been recovered from clinical samples as an opportunistic pathogen. DNA G + C content (mol%) : 49.22–60 ( T m and HPLC). Type species : Pseudoflavonifractor capillosus Carlier et al. 2010 VP (basonym: Bacteroides capillosus (Tissier 1908) Kelly 1957 AL ).