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[Mendelian randomization study of the relationship between high-density lipoprotein cholesterol and age-related
Xue-ying Qin1, Jun Tian, Kai Fang
1Department of Epidemiology and Biostatistics, Peking University School of Public Health, Beijing, China.
Insights
This Mendelian randomization study investigated high-density lipoprotein cholesterol (HDL-C) and age-related macular degeneration (AMD). Findings suggest HDL-C is not a causal risk factor for AMD, contradicting observational analyses.
Area of Science:
- Genetics
- Ophthalmology
- Cardiovascular Science
Background:
- High-density lipoprotein cholesterol (HDL-C) levels are associated with cardiovascular health.
- The relationship between HDL-C and age-related macular degeneration (AMD) remains unclear.
- Mendelian randomization (MR) offers a method to explore causal relationships using genetic variants.
Purpose of the Study:
- To investigate genetic variants associated with HDL-C using MR analysis.
- To determine the causal association between HDL-C and AMD.
Main Methods:
- AMD cases (545) and controls (480) were recruited from multiple hospitals.
- Serum HDL-C levels were measured, and demographic data were collected.
- The LIPC rs10468017 genetic locus was utilized as an instrumental variable for HDL-C in MR analysis.
Main Results:
- Conventional analysis indicated a positive association between HDL-C and AMD (OR=2.00, 95%CI: 1.41-2.86).
- MR analysis, using LIPC rs10468017, did not support a causal link between elevated HDL-C and AMD (OR=7.15, 95%CI: 0.80-64.13).
- LIPC genotypes were confirmed to be unrelated to measured confounding factors.
Conclusions:
- This MR study does not support elevated serum HDL-C as a causal risk factor for age-related macular degeneration.
- Findings contrast with previous observational studies, highlighting the importance of genetic approaches in establishing causality.
Objective:
To explore genetic variants robustly associated with high-density lipoprotein cholesterol (HDL-C) by Mendelian randomization analysis and to examine its causal association with age-related macular degeneration (AMD).
Methods:
AMD cases and controls were selected from several hospitals nationwide. Their AMD was diagnosed by eye examination, serum HDL-C levels were examined by blood tests, and other informations were also collected including demographic characteristics, high risk behaviors and so on. The genetic loci hepatic lipase gene (LIPC) rs10468017 was used as instrumental variables for HDL-C.
Results:
The study population contained hospital-based 545 AMD patients and 480 controls. The LIPC genotypes were unrelated to all potentially confounding factors measured in this study. In conventional multivariable analyses, the HDL-C level was positively associated with AMD. The odds ratio was 2.00 (95%CI: 1.41-2.86). Instrumental variable analyses (Mendelian randomization approach) showed an increasing odds ratio of HDL-C and AMD, which was 7.15 (95%CI: 0.80-64.13).
Conclusion:
Being different with previous observational analysis, this study did not support the status of increasing serum HDL-C level as a risk factor for AMD by Mendelian randomization analysis.
