A Gene Variant Linked to Type 1 Diabetes Risk in Children

Researchers in Nigeria studied 44 children between ages 1 and 16—22 with Type 1 diabetes and 22 without. They examined a specific location in the CTLA-4 gene where genetic variation naturally occurs, called a polymorphism. This particular spot is labeled +49A/G because it can contain either an A or a G genetic letter at that position.

The G/G version of this gene variant (meaning two copies of the G letter) appeared in 54.55% of children with Type 1 diabetes, compared to only 22.73% of children without diabetes. The opposite pattern held for the A/A variant, which was more common in healthy children. These differences were statistically significant, meaning they were unlikely to occur by chance alone.

Children carrying the G/G genotype tended to develop Type 1 diabetes at younger ages. The researchers also noticed that when one child in a family had the G/G variant, their siblings were more likely to carry it too—a pattern consistent with inheritance.

This clustering suggests the gene variant runs in families and may influence not just whether someone develops Type 1 diabetes, but when symptoms first appear.

CTLA-4 is an immune system gene that helps regulate how aggressively immune cells respond. Type 1 diabetes occurs when the immune system mistakenly attacks the insulin-producing cells in the pancreas. Finding that a CTLA-4 variant is more common in people with Type 1 diabetes fits with this understanding and suggests the gene plays a role in disease development.

However, having the G/G variant does not mean someone will definitely develop Type 1 diabetes. Type 1 diabetes is complex and involves multiple genes plus environmental triggers. This research is one piece of a much larger puzzle scientists are still assembling.

This finding adds to a growing body of knowledge about genetic factors in Type 1 diabetes. As researchers identify more genetic contributors, they build a clearer picture of disease risk. This knowledge may eventually help identify children at higher risk earlier, though much more research is needed before genetic testing becomes routine in clinical care.

Source: Annals of African medicine. 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.