ArticleAmerican journal of physiology. Gastrointestinal and liver physiology2026
Roux-en-Y gastric bypass alters microbial circadian rhythms with links to metabolic improvement.
Article in American journal of physiology. Gastrointestinal and liver physiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The circadian clock and gut microbiome are integral regulators of metabolic homeostasis, with disruptions in either system contributing to obesity pathogenesis. Roux-en-Y gastric bypass (RYGB) effectively treats severe obesity, yet the mechanisms underlying its benefits remain incompletely characterized. We investigated the impact of RYGB on cecal gut microbial composition and function using 16S rRNA sequencing in relation to host circadian gene expression and metabolic parameters in diet-induced obese mice. Diet-induced obese mice underwent RYGB or sham surgery and were compared with lean controls across multiple circadian Zeitgeber time (ZT) points (ZT3, ZT9, ZT15, and ZT21). Principal component analysis at the amplicon sequence variant level revealed significant differences in all ZT points (ZT3, ZT9, ZT15, and ZT21) in the lean and sham-operated mice; however, only a significant difference between ZT9 and ZT21 was observed in RYGB mice. Microbial gene counts and microbial pathways were also different between RYGB and sham-operated mice, with several correlating with hepatic
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