Brain arteriovenous malformations are associated with interleukin-1 cluster gene polymorphisms

Area of Science:

• Genetics
• Neuroscience
• Immunology

Background:

• Brain arteriovenous malformations (BAVMs) are a rare cause of hemorrhagic stroke in young adults.
• Functional polymorphisms in proinflammatory cytokines are implicated in cerebrovascular diseases.

Purpose of the Study:

• To investigate the association between functional polymorphisms in IL-1α, IL-1β, and IL-1RN genes and BAVM susceptibility.
• To determine if these polymorphisms influence the clinical characteristics of BAVM patients.

Main Methods:

• Analysis of allelic and genotypic frequencies for IL-1α (-889 C>T), IL-1β (-511 C>T), and IL-1RN (VNTR) polymorphisms.
• Comparison of clinical characteristics across different genotypes in 101 BAVM patients and 210 healthy controls.
• Haplotype analyses were performed to confirm findings.

Main Results:

• Significant association found between IL-1α -889 C>T polymorphism and BAVM risk (P < .001), with the T allele increasing risk by 2.47-fold.
• Significant differences in IL-1RN VNTR allele and genotype frequencies between BAVM cases and controls (P = .009), with Allele 1 associated with a twofold increased risk.
• IL-1α and IL-1β genotypes significantly modified several clinical characteristics of BAVM.

Conclusions:

• Functional polymorphisms in the IL-1 gene complex are associated with BAVM susceptibility.
• These genetic variations impact the clinical presentation of BAVMs.
• The study supports a role for proinflammatory cytokines in the etiopathogenesis of BAVMs.