Gender specific association of a complement component 3 polymorphism with polypoidal choroidal vasculopathy.

Area of Science:

• Ophthalmology
• Genetics
• Molecular Biology

Background:

• Neovascular age-related macular degeneration (AMD) and polypoidal choroidal vasculopathy (PCV) are primary causes of irreversible vision loss.
• The complement component 3 (C3) gene is implicated in inflammatory eye diseases.

Purpose of the Study:

• To investigate the association between C3 gene single nucleotide polymorphisms (SNPs) and the risk of neovascular AMD and PCV.
• To explore potential epistatic interactions between C3 SNPs and gender in the pathogenesis of these conditions.

Main Methods:

• Genotyping of eight haplotype-tagging SNPs in the C3 gene.
• Analysis of 708 subjects, including 200 neovascular AMD patients, 233 PCV patients, and 275 controls.
• Statistical analysis to assess SNP associations and gene-gender interactions.

Main Results:

• SNP rs17030 in the C3 gene was significantly associated with PCV risk (P = 0.008), with a notable gene-gender interaction (P = 0.02).
• The rs17030 G allele increased PCV risk specifically in males (P = 0.010), but not in females.
• The C3 haplotype AG showed association with PCV in males (P = 0.010).
• No significant associations were found between the studied C3 SNPs and neovascular AMD.

Conclusions:

• The C3 gene, particularly SNP rs17030, plays a role in the development of PCV, especially in males.
• Gender acts as an epistatic factor with C3 in the pathogenesis of PCV.
• Further research into C3's role could inform targeted therapies for PCV.