Genetics and its potential to improve type 1 diabetes care

Area of Science:

• Immunogenetics
• Molecular genetics
• Diabetes research

Background:

• Type 1 diabetes (T1D) is an autoimmune disease with a significant genetic component.
• Understanding genetic susceptibility is crucial for prediction and intervention strategies.

Purpose of the Study:

• To review the current understanding of genes and variants associated with T1D risk.
• To explore the application of genetic information in T1D prediction, intervention, and clinical care.

Main Methods:

• Fine mapping and functional studies to identify T1D risk loci.
• Evaluation of single nucleotide polymorphisms (SNPs) for cell type specificity.
• Development and application of genetic risk scores (GRS).

Main Results:

• Human leukocyte antigen (HLA) genes are the primary contributors to T1D heritability.
• Non-HLA genes also play a role, with genetic effects often restricted to specific immune cell types.
• T1D-associated SNPs can be used to create GRS for distinguishing T1D from T2D and for prediagnostic screening.

Conclusions:

• Genetic susceptibility accounts for approximately half of T1D risk.
• While T1D GRS show high accuracy in white populations, their utility is limited by T1D's low prevalence.
• Identifying individuals with the highest genetic risk enables early immune monitoring and diagnosis before clinical onset.