Ipant, and the study protocol was approved by the ethics committees of Zhongnan Hospital of Wuhan University and Asia Heart Hospital. After an overnight fast, samples of venous blood were drawn from each subject into EDTA tubes. The tubes were immediately placed on ice until they arrived at the laboratory. Then, the blood specimens were separated into plasma, and stored at 280uC until analysis.Results General characteristics, plasma fatty acids and desaturase activity of the control and CAD patientsThe general 
characteristics of the control and CAD SIS-3 web patients are summarized in Table 2. Except for gender, age and diastolic, all the characteristics were different between the two groups (p,0.01). Figure S1 shows the Chromatograms of plasma fatty acids. The plasma fatty acid concentration differed between controls and CAD patients in several instances (Table 3). After adjustment for gender, age, body mass index (BMI), blood pressure, Total-cholesterol (TC), Triglyceride (TG), HDL-cholesterol (HDL-C) and LDL-cholesterol (LDL-C), CAD patients had higher concentrations of C16:0, 15481974 C16:1, C18:1n-9, AA, total Table 1. Characteristics of SNPs in FADS gene cluster.Position1 61552680 61629122 61627881 61657110 61641542 Minor allele Major allele MAF2 T T C C C G C T T A 0.333 0.454 0.143 0.474 0.Measurement of fatty acid levels and desaturase activityThe fatty acids were extracted from 200 ml of plasma and converted into their methyl esters by transesterification using the methods described previously [14].The fatty acid methyl esters were analyzed using gas chromatography (Varian 450-GC, varian Inc., USA) on a 10 m60.1 mm60.1 mm polyethylene glycol column (DB-WAX, Agilent Technologies, USA). Peaks were identified by comparison with fatty acid methyl ester standards (Sigma-Aldrich, USA) using a mass spectrometer (Varian 320-MS TQ Mass spectrometer, varian Inc., USA). The concentration of each fatty acid was expressed as a percentage of total fatty acids. D5D activity was estimated as the ratio of AA to DGLA. D6D activity was estimated as the ratio of AA to LA [15]. D9D activity was estimated as the ratio of palmitoleic acid (C16:1) to palmitic acid (C16:0) for D9D-16 and the ratio of oleic acid (C18:1n-9) toSNP rs174537 rs174616 rs174611 rs174460 rsGene near FADS1 FADS2 FADS2 FADS3 FADS1: Position in basepairs was derived from dbSNP Build 137. Based on NCBI 
Human Genome Build 37.3 (November, 2012) of chromosome 11. 2: MAF, minor allele frequency. doi:10.1371/journal.pone.0055869.tFADS Gene, Desaturase Activity and CADmonounsaturated fatty acids, and lower concentrations of LA, DHA, as well as total polyunsaturated n-3 and n-6 fatty acids. As a consequence, D6D activity, presented as AA/LA, was higher in CAD patients (p,0.001). D9D activities, estimated as the ratio of both C16:1/C16:0 and C18:1n-9/C18:0, were all increased in CAD patients (p,0.001). No significant difference in D5D activity (AA/DGLA) or n-3/n-6 was found between control and CAD patients.Genotype distribution of five selected SNPsThe genotype distributions of the five SNPs were in HardyWeinberg Equilibrium, with p.0.05 in control subjects. Figure S2 shows the normalized melting curves and peaks of small amplicons. As shown in Table 4, logistic regression analysis revealed that rs174537 was purchase 64849-39-4 associated with CAD in both additive model [OR = 0.548, 95 CI (0.385, 0.780), p = 0.001] and dominant model [OR = 0.732, 95 CI (0.555, 0.967), p = 0.028], rs174460 was also associated with CAD in bot.Ipant, and the study protocol was approved by the ethics committees of Zhongnan Hospital of Wuhan University and Asia Heart Hospital. After an overnight fast, samples of venous blood were drawn from each subject into EDTA tubes. The tubes were immediately placed on ice until they arrived at the laboratory. Then, the blood specimens were separated into plasma, and stored at 280uC until analysis.Results General characteristics, plasma fatty acids and desaturase activity of the control and CAD patientsThe general characteristics of the control and CAD patients are summarized in Table 2. Except for gender, age and diastolic, all the characteristics were different between the two groups (p,0.01). Figure S1 shows the Chromatograms of plasma fatty acids. The plasma fatty acid concentration differed between controls and CAD patients in several instances (Table 3). After adjustment for gender, age, body mass index (BMI), blood pressure, Total-cholesterol (TC), Triglyceride (TG), HDL-cholesterol (HDL-C) and LDL-cholesterol (LDL-C), CAD patients had higher concentrations of C16:0, 15481974 C16:1, C18:1n-9, AA, total Table 1. Characteristics of SNPs in FADS gene cluster.Position1 61552680 61629122 61627881 61657110 61641542 Minor allele Major allele MAF2 T T C C C G C T T A 0.333 0.454 0.143 0.474 0.Measurement of fatty acid levels and desaturase activityThe fatty acids were extracted from 200 ml of plasma and converted into their methyl esters by transesterification using the methods described previously [14].The fatty acid methyl esters were analyzed using gas chromatography (Varian 450-GC, varian Inc., USA) on a 10 m60.1 mm60.1 mm polyethylene glycol column (DB-WAX, Agilent Technologies, USA). Peaks were identified by comparison with fatty acid methyl ester standards (Sigma-Aldrich, USA) using a mass spectrometer (Varian 320-MS TQ Mass spectrometer, varian Inc., USA). The concentration of each fatty acid was expressed as a percentage of total fatty acids. D5D activity was estimated as the ratio of AA to DGLA. D6D activity was estimated as the ratio of AA to LA [15]. D9D activity was estimated as the ratio of palmitoleic acid (C16:1) to palmitic acid (C16:0) for D9D-16 and the ratio of oleic acid (C18:1n-9) toSNP rs174537 rs174616 rs174611 rs174460 rsGene near FADS1 FADS2 FADS2 FADS3 FADS1: Position in basepairs was derived from dbSNP Build 137. Based on NCBI Human Genome Build 37.3 (November, 2012) of chromosome 11. 2: MAF, minor allele frequency. doi:10.1371/journal.pone.0055869.tFADS Gene, Desaturase Activity and CADmonounsaturated fatty acids, and lower concentrations of LA, DHA, as well as total polyunsaturated n-3 and n-6 fatty acids. As a consequence, D6D activity, presented as AA/LA, was higher in CAD patients (p,0.001). D9D activities, estimated as the ratio of both C16:1/C16:0 and C18:1n-9/C18:0, were all increased in CAD patients (p,0.001). No significant difference in D5D activity (AA/DGLA) or n-3/n-6 was found between control and CAD patients.Genotype distribution of five selected SNPsThe genotype distributions of the five SNPs were in HardyWeinberg Equilibrium, with p.0.05 in control subjects. Figure S2 shows the normalized melting curves and peaks of small amplicons. As shown in Table 4, logistic regression analysis revealed that rs174537 was associated with CAD in both additive model [OR = 0.548, 95 CI (0.385, 0.780), p = 0.001] and dominant model [OR = 0.732, 95 CI (0.555, 0.967), p = 0.028], rs174460 was also associated with CAD in bot.