An Update on the Role and Potential Molecules in Relation to Ruminococcus gnavus in Inflammatory Bowel Disease, Obesity and Diabetes Mellitus

Jinni Hong,1,2 Tingting Fu,1,2 Weizhen Liu,1,2 Yu Du,1,2 Junmin Bu,1,2 Guojian Wei,1,2 Miao Yu,1,2 Yanshan Lin,1,2 Cunyun Min,1,2 Datao Lin3 1Department of Traditional Chinese Medicine, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, Guangdong, 510080, People’s Republic of China; 2Guangdong Provincial Institute of Geriatric, Guangzhou, Guangdong, 510080, People’s Republic of China; 3Department of Parasitology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, Guangdong, 510080, People’s Republic of ChinaCorrespondence: Jinni Hong, Department of Traditional Chinese Medicine, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, Guangdong, 510080, People’s Republic of China, Tel/Fax +86 02083827812, Email hongjinni@gdph.org.cn Datao Lin, Department of Parasitology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, 510080, People’s Republic of China, Tel/Fax +86 02087330118, Email lindt5@mail.sysu.edu.cnAbstract: Ruminococcus gnavus (R. gnavus) is a gram-positive anaerobe commonly resides in the human gut microbiota. The advent of metagenomics has linked R. gnavus with various diseases, including inflammatory bowel disease (IBD), obesity, and diabetes mellitus (DM), which has become a growing area of investigation. The initial focus of research primarily centered on assessing the abundance of R. gnavus and its potential association with disease presentation, taking into account variations in sample size, sequencing and analysis methods. However, recent investigations have shifted towards elucidating the underlying mechanistic pathways through which R. gnavus may contribute to disease manifestation. In this comprehensive review, we aim to provide an updated synthesis of the current literature on R. gnavus in the context of IBD, obesity, and DM. We critically analyze relevant studi