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MUFAs are unsaturated FAs with one double bond and are derived from endogenous synthesis and dietary intake. Accumulating evidence has suggested that plasma and erythrocyte MUFA levels are associated with cardiometabolic disorders, including CVD, T2D, and metabolic syndrome (MS). Previous genome-wide association studies (GWASs) have identified seven loci for plasma and erythrocyte palmitoleic and oleic acid levels in populations of European origin. To identify additional MUFA-associated loci and the potential functional variant at each locus, we performed ethnic-specific GWAS meta-analyses and trans-ethnic meta-analyses in more than 15,000 participants of Chinese and European ancestry. We identified novel genome-wide significant associations for vaccenic acid atFADS1/2andPKD2L1[log10(Bayes factor) ≥ 8.07] and for gondoic acid atFADS1/2andGCKR[log10(Bayes factor) ≥ 6.22], and also observed improved fine-mapping resolutions atFADS1/2andGCKRloci. The greatest improvement was observed atGCKR, where the number of variants in the 99% credible set was reduced from 16 (covering 94.8 kb) to 5 (covering 19.6 kb, including a missense variant rs1260326) after trans-ethnic meta-analysis. We also confirmed the previously reported associations ofPKD2L1,FADS1/2,GCKR, andHIF1ANwith palmitoleic acid and ofFADS1/2andLPCAT3with oleic acid in the Chinese-specific GWAS and the trans-ethnic meta-analyses. Pathway-based analyses suggested that the identified loci were in unsaturated FA metabolism and signaling pathways. Our findings provide novel insight into the genetic basis relevant to MUFA metabolism and biology.

Original publication

DOI

10.1194/jlr.P071860

Type

Journal article

Journal

J Lipid Res

Publication Date

05/2017

Volume

58

Pages

974 - 981

Keywords

fatty acid/biosynthesis, fatty acid/desaturases, fatty acid/metabolism, genetics, monounsaturated fatty acid, Asian Continental Ancestry Group, Chromosome Mapping, European Continental Ancestry Group, Fatty Acids, Monounsaturated, Genetic Loci, Genome-Wide Association Study, Humans