The Apolipoprotein E ε4 Allele Is Unlikely to Be a Major Risk Factor of Age-Related Macular Degeneration in Chinese

Apolipoprotein E (ApoE) is a major transporter of lipids and cholesterol in the nervous system. Age-related macular degeneration (ARMD), characterized by drusen containing lipids, was reported to show a lower frequency of the ApoE ε4 allele than control subjects. We sought to examine the association of this polymorphism with ARMD in Hong Kong Chinese. Among 98 ARMD subjects, the frequency of ε4 carriers showed a trend toward a decrease compared to controls, but it was not significant (11.2 vs. 15.0%, p < 0.52). The association of ε4 with an apparent reduced risk of ARMD was reported previously in the exudative form of the disease, however among 39 exudative ARMD patients there was also no significant difference in ε4 frequency (12.8%, p < 0.93). The lack of a statistically significant effect of ε4 may be due to the lower frequency of ε4 in Chinese than Europeans. Thus we cannot exclude a possible effect of this allele on ARMD risk, but we can conclude that this allele is likely not a major factor influencing ARMD risk in the Chinese.