Type 1 Diabetes May Not Be Just One Disease: What a New Study Found

Type 1 diabetes has traditionally been treated as one autoimmune disease, in which the body's immune system mistakenly attacks and destroys insulin-producing beta cells in the pancreas. But a major international study suggests that the condition may actually include different biological subtypes.

The findings could eventually change how type 1 diabetes is studied, diagnosed, and treated, although more research is needed before they can influence routine medical care. What did the new study find?

Researchers from the US and UK investigated genetic differences among people with type 1 diabetes. They focused on two genetic patterns known as HLA-DR3 and HLA-DR4, both of which are associated with an increased risk of developing the disease.

The researchers carried out the first genome-wide association study to analyse people with type 1 diabetes separately according to these genetic signatures. The study published in Diabetologia included 9,091 people with type 1 diabetes and 14,157 controls.

The results showed enough genetic differences between the groups to suggest that type 1 diabetes may have distinct subtypes rather than following exactly the same biological pathway in everyone.

How Could The Two Forms Be Different?

The researchers found differences in the immune mechanisms associated with the two genetic backgrounds.

• In people with the HLA-DR3 pattern, the findings pointed towards a stronger involvement of mast cells. These immune cells are involved in processes such as inflammation and responses to potential threats.
• In people with the HLA-DR4 pattern, the study found stronger evidence involving T cells. These immune cells can attack other cells and are known to play an important role in the destruction of pancreatic beta cells in type 1 diabetes.

This suggests that although the final outcome may be type 1 diabetes, the biological events leading to it could differ between people.

Also Read: A Popular Diabetes Drug Slows Ageing? What New Research Finds

Why does this matter?

Type 1 diabetes does not develop at exactly the same speed in everyone. Some people develop the disease during early childhood, while others are diagnosed as adults.

The researchers say their findings provide further evidence that different biological mechanisms may contribute to this variation.

Understanding these differences could eventually allow researchers to develop more personalised treatments. Instead of assuming that one treatment will work equally well for everyone with type 1 diabetes, future therapies could potentially target the specific biological pathway involved in an individual.

The findings could also help researchers design clinical trials more effectively by analysing participants according to their HLA-DR3 or HLA-DR4 status.

Could This Change Type 1 Diabetes Treatment?

The study does not mean that people with type 1 diabetes should currently receive different treatments based on their genetic profile. It provides evidence for possible subtypes that need to be investigated further.

Researchers also pointed out that people without the DR3 or DR4 patterns may have other genetic and biological pathways involved in their disease. This means type 1 diabetes could involve several overlapping mechanisms rather than just two.

Future studies will need to examine how these genetic differences relate to the development and progression of the disease, including the role of autoantibodies and environmental factors.

Also Read: Can Diabetes Damage Your Heart Before Symptoms Appear?

What Does This Mean For People With Type 1 Diabetes?

For now, the findings are mainly important for research rather than changing everyday diabetes management.

People with type 1 diabetes still require appropriate insulin treatment and regular monitoring as advised by their healthcare team. The new research could, however, contribute to a more detailed understanding of why the disease develops differently in different people.

The long-term goal is more personalised care, where treatment and prevention strategies can be matched more closely to the biology of each individual.

Final Word

The study provides an important clue that type 1 diabetes may be more biologically diverse than previously thought. Further research will determine whether these differences can eventually be translated into better ways to predict, prevent, or treat the disease.