Histocompatibility antigens and diabetic retinopathy

Area of Science:

• Immunogenetics
• Endocrinology
• Ophthalmology

Background:

• Human leukocyte antigen (HLA) genes play a crucial role in immune regulation and have been implicated in various autoimmune diseases, including diabetes.
• Previous studies suggested associations between specific HLA alleles and the development of diabetic complications, particularly retinopathy.
• The role of HLA in late-onset diabetes and its complications requires further investigation.

Purpose of the Study:

• To investigate the association between HLA-A1 and HLA-B8 alleles and diabetic retinopathy in patients with adult-onset diabetes.
• To examine the relationship between HLA-B8 and HLA-B7 alleles and retinopathy in patients with juvenile-onset diabetes.
• To compare HLA allele prevalences in diabetic patients with and without retinopathy against healthy controls.

Main Methods:

• Case-control study comparing HLA allele frequencies.
• Analysis of 160 patients with adult-onset diabetes (onset ≥30 years) and 90 patients with juvenile-onset diabetes (onset <30 years).
• Comparison groups included patients with and without retinopathy, and 282 healthy blood donors.

Main Results:

• In adult-onset diabetes, HLA-A1 and B8 prevalences were compared between patients with and without retinopathy, and healthy donors.
• In juvenile-onset diabetes, a significant increase in HLA-B8 and decrease in HLA-B7 were confirmed.
• No significant differences in HLA alleles were observed between juvenile-onset diabetics with and without retinopathy.

Conclusions:

• Specific HLA alleles, namely HLA-A1 and B8, may be associated with an increased risk of retinopathy in adult-onset diabetes.
• The previously reported associations of HLA-B8 and B7 with juvenile-onset diabetes were confirmed.
• HLA allele associations with retinopathy differ between adult-onset and juvenile-onset diabetes, suggesting distinct pathogenetic mechanisms.