Purpose: To see if there is an association in Japanese between elastin gene (ELN) polymorphisms and neovascular age-related macular degeneration (AMD) or its subtypes, typical AMD (tAMD) and polypoidal choroidal vasculopathy (PCV).
Methods: The authors genotyped five single nucleotide polymorphisms (SNPs), rs2301995, rs2856728, rs868005, rs884843, and rs13239907, at Kyoto University and Saitama Medical University. A case-control study was performed on 1296 patients with AMD and 478 controls.
Results: A statistically significant association was detected between the rs2301995 SNP and AMD (P = 0.018). Furthermore, subtype analysis revealed a significant association of rs2301995 with tAMD (P = 0.0018), but not with PCV. The genotype distribution of rs2301995 also differed significantly between tAMD and PCV (P = 0.00030). The trend in genotype distribution of rs2301995 was similar between the Kyoto and the Saitama studies. The A allele frequency was higher in tAMD, whereas it was similar in PCV and in controls, which is opposite to that reported in a previous study that the A allele frequency is higher in PCV, whereas it is similar in tAMD and in controls. Haplotype analysis also showed that the ELN polymorphism is significantly associated with tAMD (P = 0.0055), but not with PCV.
Conclusions: ELN is associated with AMD in Japanese. Furthermore, the findings suggest that ELN is a susceptibility gene for tAMD but not for PCV, which is opposite to that reported in a previous study that ELN is the susceptibility gene for PCV but not for tAMD.