Associations of complement factor B and complement component 2 genotypes with subtypes of polypoidal choroidal...

Area of Science:

• Ophthalmology
• Genetics
• Immunology

Background:

• Polypoidal choroidal vasculopathy (PCV) is a subtype of age-related macular degeneration.
• Previous research categorized PCV into polypoidal choroidal neovascularization (CNV) and typical PCV.
• The role of complement genes in PCV subtypes requires further investigation.

Purpose of the Study:

• To investigate the association between complement component 2 (C2) and complement factor B (CFB) genotypes and PCV subtypes.
• To determine if specific C2 and CFB variants differentiate polypoidal CNV from typical PCV.

Main Methods:

• Genotyping of single nucleotide polymorphisms (SNPs) in C2 (rs547154) and CFB (rs541862, rs2072633, rs4151667).
• Case-control studies were conducted on 677 patients with typical age-related macular degeneration (tAMD), PCV, and retinal angiomatous proliferation (RAP), and 282 PCV patients were subtyped.
• Logistic regression analysis was used to adjust for confounding factors.

Main Results:

• SNPs rs547154 and rs2072633 were associated with allele distributions in the overall PCV group.
• Specific C2 and CFB SNPs (rs547154, rs541862, rs2072633) showed significant differences in polypoidal CNV cases compared to controls, indicating a protective effect.
• The A/A genotype of rs2072633 was more common in polypoidal CNV than typical PCV.

Conclusions:

• PCV can be genetically distinguished into polypoidal CNV and typical PCV.
• C2 and CFB gene variants are significantly associated with polypoidal CNV.
• Typical PCV did not show association with the studied C2 and CFB gene variants.