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Published on: July 14, 2016
Correlation of complement factor H gene polymorphisms with exudative age-related macular degeneration in a Chinese
1Clinical Medical Department of Medical School, Shandong University, Jinan, China.
Insights
This study found that specific variations in the complement factor H (CFH) gene are associated with an increased risk of exudative age-related macular degeneration (AMD) in the Chinese population. These genetic factors may play a role in AMD development.
Area of Science:
- Genetics
- Ophthalmology
- Molecular Biology
Background:
- Age-related macular degeneration (AMD) is a leading cause of vision loss in older adults.
- Complement factor H (CFH) gene is implicated in AMD pathogenesis.
- Understanding genetic risk factors is crucial for AMD prevention and treatment.
Purpose of the Study:
- To investigate the association between CFH gene polymorphisms and exudative AMD risk in a Chinese cohort.
- To identify specific single nucleotide polymorphisms (SNPs) and haplotypes within the CFH gene linked to AMD.
- To analyze genetic variations and their prevalence across different Chinese populations.
Main Methods:
- Case-control study involving 136 exudative AMD patients and 140 controls.
- Genotyping of three common CFH SNPs: -257C>T (rs3753394), Y402H (rs1061170), and IVS15 (rs1329428).
- Haplotype analysis and sequencing of selected PCR products; statistical analysis of genotype and allele data.
Main Results:
- Risk alleles (T, C, G) in the three SNPs showed significant association with increased AMD likelihood (1.72-fold, 3.14-fold, 1.79-fold).
- The heterozygous genotype TC at rs1061170 was significantly associated with AMD; rs3753394 and rs1329428 showed slight associations.
- Risk haplotypes (TCG, CTG) and a protective haplotype (CTA) were identified, with variations observed across Chinese cohorts and low linkage disequilibrium among SNPs.
Conclusions:
- Specific CFH gene polymorphisms and haplotypes are significantly associated with exudative AMD risk in the Chinese population.
- Genetic divergence in CFH risk factors exists among different Chinese cohorts.
- These findings contribute to understanding the genetic basis of AMD and may inform future diagnostic or therapeutic strategies.
Abstract:
To evaluate the association between complement factor H (CFH) gene polymorphism and the risk of exudative age-related macular degeneration (AMD) in a case-control study in a Chinese cohort. One hundred and thirty-six exudative AMD patients and 140 age- and sex-matched control subjects were recruited. We genotyped 3 common single nucleotide polymorphisms (SNPs), namely, -257C>T (rs3753394), Y402H (rs1061170) and IVS15 (rs1329428), genetic analyses were performed on all available genotype data. All the possible haplotypes of these 3 SNPs were detected. Polymerase chain reaction (PCR) and allele-specific restriction endonuclease digestion were performed, some PCR products of these 3 SNPs were sequenced. The risk alleles (T, C or G) of the 3 SNPs conferred 1.72-fold, 3.14-fold, and 1.79-fold of increased likelihood of the disease, respectively (P<0.05). The heterozygous genotype in rs1061170 (TC) revealed significant association, meanwhile rs3753394 and rs1329428 had a slight association with the disease, respectively. Significant differences were shown in the risk alleles in the 3 SNPs among different Chinese cohort. Low linkage disequilibrium was found among the 3 SNPs. The haplotypes TCG and CTG revealed as risk factors, whereas the protective haplotype CTA was over-represented in controls. We found significant association between risk alleles (T, C or G) of the 3 SNPs and the disease. The genetic divergence across multiple populations within Chinese existed. Risk haplotypes and protective haplotype were found in this study.
