
28/07/2025
A new era in multiple sclerosis (MS) research has arrived, as scientists have pinpointed two gut bacteria strains that may play a crucial role in triggering the disease. In a carefully designed study at Ludwig Maximilian University of Munich, researchers compared 81 pairs of identical twins, one with MS, one without revealing differences that couldn’t be explained by genes or environment alone. The answer, it turns out, may lie in the gut microbiome.
The twin pairs showed a striking pattern: Eisenbergiella tayi and Lachnoclostridium were consistently more abundant in the MS-affected siblings. Taking the research a step further, the team transferred these specific bacteria into mice, which then began showing symptoms of an MS-like condition. This discovery is the strongest evidence yet that certain gut microbes don’t just reflect disease—they may actively help cause it by influencing the immune system’s attack on the brain and spinal cord.
While previous research has hinted at a gut-brain link in MS, this is the first time specific bacterial “culprits” have been identified and shown to trigger disease in animal models. With further validation in human studies, these findings could transform MS treatment. Doctors may one day move beyond immune-suppressing drugs to target the gut itself, offering new hope for slowing, stopping, or even preventing MS before it starts.
Credits/Sources: Rojas, O. L., et al. (2025). Identification of MS-associated gut bacterial strains using identical twins discordant for disease. Proceedings of the National Academy of Sciences.