Association between CTLA-4 gene polymorphism and ankylosing spondylitis: a case-control study.

Area of Science:

• Immunogenetics
• Rheumatology
• Molecular Biology

Background:

• Ankylosing spondylitis (AS) is a chronic inflammatory disease.
• Genetic factors, including polymorphisms in immune response genes, are implicated in AS pathogenesis.
• CTLA-4 plays a crucial role in T-cell regulation and immune tolerance.

Purpose of the Study:

• To investigate the association between specific CTLA-4 gene polymorphisms (+49A/G, -318C/T, and CT60A/G) and the susceptibility to ankylosing spondylitis.
• To determine if these genetic variations influence the risk of developing AS.

Main Methods:

• Case-control study involving 120 AS patients and matched healthy controls.
• Genotyping of CTLA-4 polymorphisms using Polymerase Chain Reaction-Restriction Fragment Length Polymorphisms (PCR-RFLP).
• Statistical analysis using Odds Ratios (OR) and 95% Confidence Intervals (CI) to assess risk association.

Main Results:

• The AA genotype of the CTLA-4 +49A/G polymorphism was associated with an increased risk of AS (OR=2.357).
• The AA genotype and A allele of the CTLA-4 CT60A/G polymorphism were also linked to higher AS susceptibility (OR=2.610 and OR=1.751, respectively).
• The T allele of the CTLA-4 -318C/T polymorphism demonstrated a protective effect against AS (OR=0.383).

Conclusions:

• Significant associations were found between CTLA-4 gene polymorphisms and altered susceptibility to ankylosing spondylitis.
• Specific CTLA-4 variants may act as risk factors, while others may be protective for AS.
• These findings contribute to understanding the genetic underpinnings of AS.