Study: Weaning Shifts Mouse Gut Microbiome, Epigenetic Immune Memory

A new study has revealed that the transition from breastfeeding to solid foods in early life triggers profound changes in the gut microbiome, leading to epigenetic modifications that shape long-term immune memory in mice. Published this week in Nature Microbiology, the research, led by scientists including Li Yang and Lanlan Shen from institutions such as Baylor College of Medicine and Tongji University, demonstrates how these microbial shifts during weaning create lasting adaptations in the immune system, potentially influencing susceptibility to diseases throughout life.

The study focused on weaning, a critical developmental phase when the gut microbiome undergoes rapid remodeling as dietary sources shift from milk to solid foods. Researchers used advanced multiomics techniques to analyze microbial composition, metabolite production, chromatin accessibility, and gene expression in mice before and after this transition. Their findings show that specific bacteria proliferate in response to the dietary change, producing metabolites such as short-chain fatty acids and alpha-ketoglutarate. These compounds act as signals that induce epigenetic alterations, including histone...