New Research Links Gut Microbes, Immune Response, and Diabetic Eye Disease

Diabetic retinopathy is damage to the blood vessels in the retina, the light-sensing tissue at the back of the eye. It is a leading cause of vision loss in people with diabetes. Scientists have long known that high blood sugar damages these tiny vessels, but researchers are now exploring whether other factors—like immune system activity and gut health—also play a role.

A team of researchers used a tool called gutMGene to identify genes connected to gut bacteria and the substances they produce. They then compared these genes to blood cell data from people with diabetic retinopathy. Using advanced statistical methods, they narrowed down a list of 238 candidate genes to ten that appeared most consistently linked to diabetic retinopathy across multiple datasets.

One of these genes, FLNA, stood out. It showed up repeatedly in blood cells and retinal tissue samples from people with diabetic retinopathy, particularly in those with type 2 diabetes and in advanced cases with both retinopathy and macular edema (swelling in the center of the retina).

FLNA produces a protein involved in cell structure and immune function. When researchers used computer modeling to predict what would happen if FLNA were turned off, they found it would alter immune-related activity in specific blood cells—including B cells and monocytes—that are involved in inflammation and immune response. This suggests FLNA may help control how the immune system reacts in diabetic retinopathy.

This study identifies a potential biological connection between gut health, immune function, and diabetic retinopathy. However, the research is exploratory; it shows patterns in genetic data but does not prove that gut microbes cause diabetic retinopathy or that changing the microbiome will prevent it.

The findings suggest that diabetic retinopathy may involve more than blood vessel damage alone. Future research will need to test whether the genes identified here actually affect disease progression and whether they could become targets for new treatments.

Source: International journal of molecular sciences. Evidence type: PubMed indexed literature. Type1Cure is an information and intelligence hub, not a medical advice service. This article summarizes published research and does not provide diagnosis, treatment, or personal medical guidance. Always talk to your own care team before changing anything about your Type 1 diabetes management.