A Gene Variant Linked to Type 1 Diabetes Risk in Kurdish Populations

Type 1 diabetes develops when the immune system mistakenly attacks the insulin-producing cells in the pancreas. Scientists have long suspected that genes controlling immune function play a key role in this process. One gene that gets a lot of research attention is CTLA-4, which helps regulate how aggressive our immune cells become.

Small variations—called polymorphisms—in the CTLA-4 gene are known to differ between people and may influence diabetes risk. Researchers wanted to know whether specific CTLA-4 variants were more common in people with Type 1 diabetes, particularly in the Kurdish population of Iraq.

This preliminary study compared 52 patients with Type 1 diabetes to 21 healthy control subjects. Researchers tested two common CTLA-4 gene variants to see which were associated with diabetes.

One variant, called A>G (rs231775), showed a significant difference between the two groups. The G allele was present in 36.5% of people with Type 1 diabetes but appeared less frequently in healthy controls. This suggests the G allele may be linked to higher diabetes risk in this population.

A second variant tested (called -318 C>T) showed no meaningful differences between the diabetes and control groups, indicating it is unlikely to influence diabetes risk in this population.

Researchers also measured anti-GAD antibodies—markers the immune system produces when it begins attacking insulin-producing cells—and tested whether CTLA-4 gene expression differed between groups.

While the GG genotype of the A>G variant appeared more often in people who tested positive for anti-GAD antibodies, the difference was not statistically significant, meaning it could have occurred by chance. CTLA-4 mRNA expression (a measure of how active the gene is) was slightly higher in people with Type 1 diabetes, but this difference also did not reach statistical significance.

This study adds evidence that CTLA-4 gene variants may influence Type 1 diabetes risk, at least in Kurdish populations. However, this was a small, preliminary study, and findings in one population do not necessarily apply to others.

Genetic research like this helps scientists map the biological pathways involved in Type 1 diabetes. Understanding which genes influence risk brings us closer to new ways to identify people at high risk and eventually develop better prevention and treatment strategies. More research in larger and more diverse populations is needed to confirm these findings and explore how this variant affects diabetes development.

Source: Frontiers in endocrinology. 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.