Could Yersinia bacteria play a role in inflammatory bowel disease?

What is it about?

Yersinia enterocolitica and Yersinia pseudotuberculosis are bacteria usually responsible for short-lived gut infections, often from contaminated food. Some studies have also found them in patients with inflammatory bowel disease (IBD), such as Crohn's disease, especially in people with a genetic predisposition. In this review we examine whether these bacteria cause IBD, simply take advantage of an already inflamed gut, or accumulate there by chance. Most evidence comes from DNA detection (PCR), with few studies confirming live bacteria, so it cannot prove active infection or causation. We describe how Yersinia exploit a weakened intestinal barrier and impaired mucosal immunity, using molecular 'syringes' to trigger inflammation and cell death, and how variants in genes involved in autophagy, such as NOD2 and ATG16L1, may hamper bacterial clearance. We also discuss rising antibiotic resistance and the potential, still unproven, of probiotics.

Featured Image

Photo by Sasun Bughdaryan on Unsplash

Photo by Sasun Bughdaryan on Unsplash

Why is it important?

The causes of IBD remain incompletely understood, and microbes are thought to be key triggers in susceptible people. By critically weighing the evidence on Yersinia, this review clarifies what is known and what is not, and points to the studies needed - culture-confirmed and sequencing-based - to establish a causal role. Understanding the interplay between Yersinia and host genetics could pave the way for precision diagnostics and microbiota-targeted therapies.

Perspectives