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Effect of naturally random allocation to lower low-density lipoprotein cholesterol on the risk of coronary heart disease mediated by polymorphisms in NPC1L1, HMGCR, or both: a 2 × 2 factorial Mendelian randomization study

Journal of the American College of Cardiology, 2015-04, Vol.65 (15), p.1552-1561 [Peer Reviewed Journal]

Copyright © 2015 American College of Cardiology Foundation. Published by Elsevier Inc. All rights reserved. ;ISSN: 0735-1097 ;EISSN: 1558-3597 ;DOI: 10.1016/j.jacc.2015.02.020 ;PMID: 25770315

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  • Title:
    Effect of naturally random allocation to lower low-density lipoprotein cholesterol on the risk of coronary heart disease mediated by polymorphisms in NPC1L1, HMGCR, or both: a 2 × 2 factorial Mendelian randomization study
  • Author: Ference, Brian A ; Majeed, Faisal ; Penumetcha, Raju ; Flack, John M ; Brook, Robert D
  • Subjects: Cholesterol, LDL - blood ; Cholesterol, LDL - genetics ; Coronary Disease - blood ; Coronary Disease - genetics ; Female ; Genetic Predisposition to Disease ; Humans ; Hydroxymethylglutaryl CoA Reductases - genetics ; Male ; Membrane Proteins - genetics ; Mendelian Randomization Analysis ; Middle Aged ; Polymorphism, Genetic ; Risk Assessment
  • Is Part Of: Journal of the American College of Cardiology, 2015-04, Vol.65 (15), p.1552-1561
  • Description: Considerable uncertainty exists as to whether lowering low-density lipoprotein cholesterol (LDL-C) by inhibiting the Niemann-Pick C1-Like 1 (NPC1L1) receptor with ezetimibe, either alone or in combination with a 3-hydroxy-3-methylglutaryl-coenzyme A reductase (HMGCR) inhibitor (statin), will reduce the risk of coronary heart disease (CHD). This study evaluated the effect of naturally random allocation to lower LDL-C mediated by polymorphisms in the NPC1L1 gene (target of ezetimibe), the HMGCR gene (target of statins), or both (target of combination therapy) on the risk of CHD. We constructed NPC1L1 and HMGCR genetic LDL-C scores to naturally randomize participants into 4 groups: reference, lower LDL-C mediated by NPC1L1 polymorphisms, lower LDL-C mediated by HMGCR polymorphisms, or lower LDL-C mediated by polymorphisms in both NPC1L1 and HMGCR. We compared the risk of CHD (fatal or nonfatal myocardial infarction) among each group using a 2 × 2 factorial mendelian randomization study design. A total of 108,376 persons (10,464 CHD events) from 14 studies were included. There were no significant differences in baseline characteristics among the 4 groups, thus confirming that allocation was random. Compared to the reference group, the NPC1L1 group had 2.4 mg/dl lower LDL-C and 4.8% lower risk of CHD (odds ratio [OR]: 0.952, 95% confidence interval [CI]: 0.920 to 0.985); whereas the HMGCR group had 2.9 mg/dl lower LDL-C and a similar 5.3% lower risk of CHD (OR: 0.947, 95% CI: 0.909 to 0.986). The group with lower LDL-C mediated by both NPC1L1 and HMGCR polymorphisms had 5.8 mg/dl additively lower LDL-C and a 10.8% log-linearly additive lower risk of CHD (OR: 0.892, 95% CI: 0.854 to 0.932). The effect of lower LDL-C on the risk of CHD mediated by polymorphisms in NPC1L1, HMGCR, or both is approximately the same per unit lower LDL-C and log-linearly proportional to the absolute exposure to lower LDL-C.
  • Publisher: United States
  • Language: English
  • Identifier: ISSN: 0735-1097
    EISSN: 1558-3597
    DOI: 10.1016/j.jacc.2015.02.020
    PMID: 25770315
  • Source: GFMER Free Medical Journals
    MEDLINE
    Alma/SFX Local Collection
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