Available online 13 September 2022, 102642
Highlights•D. hominis showed improved growth after 1% succinate addition into the medium.
•Succinate produced by B. thetaiotaomicron improved the growth of D. hominis.
•Succinate was mostly converted to propionate in the mixed culture.
AbstractThis study revealed an interaction between the gut commensal bacterium Bacteroides thetaiotaomicron JCM 5827T and asaccharolytic bacterium Dialister hominis JCM 33369T, which uses succinate instead of carbohydrates for growth. D. hominis usually forms extremely small colonies on Brucella blood agar plates. However, when co-cultured with B. thetaiotaomicron, D. hominis grew noticeably and formed larger colonies than those in the single culture, especially near B. thetaiotaomicron colonies. Although D. hominis barely grew in Gifu anaerobic medium broth, adding 1% succinate improved its growth. In the mixed culture, the succinate produced by B. thetaiotaomicron was mostly converted to propionate. This result was consistent with the single culture of D. hominis in the succinate-containing broth and our previous report on Phascolarctobacterium faecium, a succinate-utilizing gut bacterium. Our series of studies suggests that syntrophy within the human gut microbiota occurs via succinate.
KeywordsBacteroides thetaiotaomicron
Dialister hominis
Succinate consumer
Succinate producer
© 2022 The Authors. Published by Elsevier Ltd.
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