Genetic markers for acute anterior uveitis

Area of Science:

• Immunogenetics
• Ophthalmology
• Rheumatology

Background:

• Acute anterior uveitis (AAU) is an ocular inflammatory condition.
• Ankylosing spondylitis (AS) is a systemic inflammatory disease often associated with AAU.
• Genetic factors are implicated in the pathogenesis of both AAU and AS.

Purpose of the Study:

• To investigate the association of HLA-A2 antigen and alpha-1-antitrypsin (alpha-1-AT) phenotypes with AAU and AS.
• To determine if specific genetic markers are more prevalent in patients with AAU, AS, or both.

Main Methods:

• Patient cohort included 169 individuals: 82 with AAU only, 48 with AAU and AS, and 39 with AS only.
• HLA antigen A2 typing was performed.
• Haplotype analysis (A2 B27) was conducted where family studies were available.
• Alpha-1-antitrypsin (alpha-1-AT) phenotypes were determined for a subset of patients.

Main Results:

• HLA-A2 antigen prevalence did not significantly differ from control populations across the patient groups.
• The A2 B27 haplotype also showed no significant deviation from expected values.
• The MZ phenotype of alpha-1-antitrypsin was found in 8/86 patients (4/30 AAU only, 4/29 AAU + AS), a higher prevalence than in controls.
• This indicates an increased frequency of the MZ alpha-1-AT phenotype in patients with AAU.

Conclusions:

• The MZ alpha-1-AT phenotype is associated with an increased risk of acute anterior uveitis.
• HLA-A2 antigen is not a significant risk factor for AAU in this patient cohort.
• Further research into the role of alpha-1-antitrypsin phenotypes in ocular inflammation is warranted.