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Ji-Young Lee 1 Article
Bilirubin and risk of ischemic heart disease in Korea: a two-sample Mendelian randomization study
Christina Jeon, Ji-Young Lee, Sun Ju Lee, Keum Ji Jung, Heejin Kimm, Sun Ha Jee
Epidemiol Health. 2019;41:e2019034.   Published online July 12, 2019
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AbstractAbstract AbstractSummary PDFSupplementary Material
Bilirubin is an endogenous antioxidant that protects cells against oxidative stress. Increased plasma levels of bilirubin have been associated with a reduced risk of ischemic heart disease (IHD) in previous studies. Nonetheless, whether those associations reflect a true protective effect of bilirubin on IHD, rather than confounding or reverse causation, remains unknown. Therefore, we applied two-sample Mendelian randomization to evaluate the causal association between bilirubin levels and IHD risk in a Korean population.
A total of 5 genetic variants—TRPM8 (rs10490012), USP40 (rs12993249), ATG16L1 (rs2119503), SLCO1B1 (rs4149014), and SLCO1B3 (rs73233620)—were selected as genetic instruments for serum bilirubin levels using a communitybased cohort, the Korean Genome and Epidemiology Study, comprising 33,598 subjects. We then evaluated their impact on IHD using the Korean Cancer Prevention Study-II cohort.
Among the 5 instrumental variables that showed significant associations with serum bilirubin levels, rs12993249 (USP40) showed the most significant association (p<2.36×10-105). However, we found no significant association between serum bilirubin levels and IHD. Sensitivity analyses demonstrated a consistent association, suggesting that our observations were robust.
Using two-sample Mendelian randomization, we found no association between serum bilirubin levels and IHD. Further studies that confirm the observed interactions among other ethnicities are warranted.
Korean summary
이 연구는 대규모 한국인 코호트를 이용하여, 빌리루빈과 허혈성 심장질환의 인과성을 규명한 연구결과이다. 특히 두 가지 자료를 이용한 멘델리안 무작위배정 연구방법을 적용하여, 한국인을 대상으로 빌리루빈과 허혈성 심장질환의 인과성을 처음으로 규명한 점이 큰 시사점을 가진다.


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