Association between complement factor H gene polymorphisms and neovascular age-related macular degeneration in Koreans
Na Rae Kim 1*,
Ju Hee Kang 2,
Oh Woong Kwon 3,
Seok Joon Lee 4,
Jung Hyub Oh 1,
and
Hee Seung Chin 1
1 Ophthalmology, Inha University Hospital, Incheon, Korea, Republic of
2 Pharmacology, Inha Research Institute for Medical Sciences, Incheon, Korea, Republic of
3 Ophthalmology, Yonsei University College of Medicine, Seoul, Korea, Republic of
4 Ophthalmology, Yonsei University Wonju College of Medicine, Wonju, Korea, Republic of
* To whom correspondence should be addressed. E-mail: nr{at}medimail.co.kr.
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Abstract |
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Purpose: This study was undertaken to investigate the association between the complement factor H (CFH) gene and exudative age-related macular degeneration (AMD) in Korean patients.
Methods: Genomic DNA was isolated from the peripheral leukocytes of exudative AMD patients (n=114) and controls (n=187). Criterion for exudative AMD was confined to the presence of choroidal neovascularization. Four single nucleotide polymorphisms (SNPs: -275C>T, I62V, Y402H, IVS15) located in promoter, exon2, exon9, and intron15 of the CFH gene were genotyped by PCR-based direct sequencing.
Results: The frequency of the C allele of Y402H (AMD: 10.5%, control: 6.5%) was found to be lower in Koreans than in Caucasians. In the present study, difference between the frequencies of Y402H in cases and controls did not reach statistical significance (P=0.071). However, the frequencies of the major alleles of three SNPs (-275C>T, I62V and IVS15) were significantly different in patients and controls, and these SNPs were found to be separately associated with an elevated risk of exudative AMD. Seven haplotypes were identified in Koreans. Haplotype analysis showed that two haplotypes (TGTG, CGTG) conferred significantly higher risks of exudative AMD (P=0.013, 0.035), and one haplotype (CATA) was significantly protective (P<0.001).
Conclusions: In Korean subjects, CFH polymorphism appears to be a considerable hereditary contributor to exudative AMD. Y402H polymorphism which has been suggested to be a major risk factor of AMD in Caucasians was only found to be marginally associated with exudative AMD with low frequency, while three adjacent SNPs in CFH gene were significantly associated with AMD in Koreans.
Key Words:
age-related macular degeneration, complement factor H, CFH, mutation, single nucleotide polymorphism
