Associations between Apolipoprotein A1 Structural Variants and High-Density Lipoprotein Function

Project: Research project

Project Details


High-density lipoprotein cholesterol (HDL-C) concentration is inversely associated with atherosclerotic cardiovascular disease (ASCVD) risk. However, recent data suggest that a measure of HDL particle function, HDL efflux capacity, may be a stronger predictor of ASCVD risk than HDL cholesterol level. HDL particles are composed of apolipoprotein A1 (apoA1) and enzymes embedded in a spherical phospholipid layer that surrounds a lipid core. One of the hypothesized protective functions of HDL particles is reverse cholesterol transport (RCT), which is the flux of cholesterol from peripheral tissues to the liver, where it is metabolized or excreted. HDL efflux capacity is the rate-limiting step of RCT. We posit that variation in HDL efflux capacity is due to variation in apoA1 structure, which is a key mediator of this complex biochemical process. Recently, Top Down Proteomics has been developed, which allows for highly detailed characterization of apoA1 structural variants (proteoforms). The scientific aims of this K23 proposal are to: 1) define the spectrum of apoA1 and apoC3 proteoforms that are present in a community-based sample, 2) determine the stability of proteoform expression over time, and 3) quantify the associations among apoA1 proteoforms, traditional risk factors, high-density lipoprotein (HDL) function, and subclinical atherosclerosis. I am a practicing cardiologist and epidemiologist with interest in life course patters in cardiovascular disease and lipid-associated atherosclerotic cardiovascular risk. Although I have training and expertise in long-term risk estimation and methods to describe patterns in cardiovascular risk across the life course, I aim to develop expertise in a molecular epidemiologic approach to quantifying lipid-associated atherosclerotic risk. To achieve the translational aims of this proposal I have assembled a mentorship and advisory committee of world leaders in in clinical lipidology, cardiovascular risk estimation, HDL biology and function, Top Down Proteomics, and biometric analytic approaches to proteomic data. Upon completion of this award I will be able to transition to become an independent molecular epidemiologist with a focus on lipid-associated atherosclerotic risk. I am confident that I can achieve the scientific and career development aims of this proposal.
Effective start/end date1/1/168/31/16


  • American Heart Association (16SDG27250022)


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