Single nucleotide polymorphisms associated with sporadic brain arteriovenous malformations: where do we stand?

Area of Science:

• Genetics
• Neurology
• Vascular Biology

Background:

• Brain arteriovenous malformations (bAVMs) are abnormal vascular connections in the brain, presenting with hemorrhage, seizures, or neurological deficits.
• While sporadic bAVMs lack a specific genetic cause, genes in angiogenesis and inflammation pathways are implicated.
• Single nucleotide polymorphisms (SNPs) are increasingly investigated for their role in bAVM susceptibility and hemorrhagic risk.

Purpose of the Study:

• To review and analyze polymorphisms associated with sporadic bAVMs in the medical literature.
• To discuss the implications of these genetic findings for predicting hemorrhagic risk and understanding bAVM natural history.
• To present a meta-analysis of existing studies on SNPs and bAVM susceptibility and bleeding risk.

Main Methods:

• Literature review and analysis of genetic association studies on sporadic bAVMs.
• Meta-analysis of risk estimates for specific SNPs and bAVM susceptibility and hemorrhage.
• Focus on polymorphisms in genes related to inflammation and angiogenesis.

Main Results:

• The interleukin 6 -174G>C and tumour necrosis factor alpha -238G>A gene polymorphisms are significantly associated with an increased risk of intracranial hemorrhage.
• The activin-like kinase 1 (ACVRL1) intervening sequence 3 -35A>G gene polymorphism is associated with increased susceptibility to developing bAVMs.
• Several other polymorphisms in inflammatory and angiogenic pathways have been investigated with varying results.

Conclusions:

• Specific SNPs in inflammatory genes (IL-6, TNF-α) and vascular development genes (ACVRL1) are linked to sporadic bAVM risk and outcomes.
• Genetic profiling may aid in predicting bAVM hemorrhage risk and understanding disease progression.
• Further hypothesis-free genome-wide studies are needed to fully elucidate the genetic architecture of bAVMs.