Association of KCTD10, MVK, and MMAB polymorphisms with dyslipidemia and coronary heart disease in Han Chinese population
Lipids in Health and Disease volume 15, Article number: 171 (2016)
Several genome-wide association studies have discovered novel loci at chromosome 12q24, which includes mevalonate kinase (MVK), methylmalonic aciduria (cobalamin deficiency) cbIB type (MMAB), and potassium channel tetramerization domain-containing 10 (KCTD10), all of which influence HDL-cholesterol concentrations. However, there are few reports on the associations between these polymorphisms and HDL-C concentrations in Chinese population. This study aimed to evaluate the associations between functional polymorphisms in three genes (MVK, MMAB and KCTD10) and HDL-C concentrations, as well as coronary heart disease (CHD) susceptibility in Chinese individuals.
We systematically selected and genotyped 18 potentially functional polymorphisms in MVK, MMAB and KCTD10 by using the TaqMan OpenArray Genotyping System in a Chinese population including 399 dyslipidemia cases, 697 CHD cases and 465 controls. Multivariate logistic regression analyses were performed to estimate the relationship between the genotypes and dyslipidemia, CHD risk with adjustment of relevant confounders.
Among six polymorphisms showing significant associations with dyslipidemia, the minor alleles of rs11066782 in KCTD10, rs11613718 in KCTD10 and rs11067233 in MMAB were significantly associated with a decreased risk of CHD (additive model: OR = 0.71, 95 % CI = 0.53–0.97, P = 0.029 for rs11066782; OR = 0.73, 95 % CI = 0.54–0.99, P = 0.044 for rs11613718 and OR = 0.57, 95 % CI = 0.40–0.80, P = 0.001 for rs11067233). Further combined analysis showed that individuals carrying “3-4” favorable alleles presented a 62 % (OR = 0.38, 95 % CI = 0.21–0.66) decreased risk of CHD compared with those carrying “0–2” favorable alleles.
These findings suggest that rs11066782 in KCTD10, rs11613718 in KCTD10 and rs11067233 in MMAB may contribute to the susceptibility of CHD by altering plasma HDL-C levels in Han Chinese.
Coronary heart disease (CHD) is one of the leading causes of morbidity and mortality in the world . In China, it is reported that more than 700,000 people die from CHD each year . CHD is a complex and multifactorial disorder caused by various environmental and genetic factors [3, 4]. Clinical and epidemiological studies have demonstrated that the presence of low levels of high-density lipoprotein-cholesterol (HDL-C) in plasma increases the risk of developing CHD [5–8]. The mechanism by which HDL-C confers protection against atherosclerosis includes reverse cholesterol transport from peripheral tissues to the liver , inhibition of low-density lipoprotein-cholesterol (LDL-C) oxidation, and stabilization of the production of prostacyclin . While smoking, diet and physical activity have a role in determining plasma HDL-C concentrations, family and twin studies have shown that about half of the variation in this trait is genetically determined [11, 12]. In 2008, a genome-wide association study (GWAS) conducted in populations of European descent discovered novel loci at chromosome 12q24, which includes mevalonate kinase (MVK), methylmalonic aciduria (cobalamin deficiency) cbIB type (MMAB), and potassium channel tetramerization domain-containing 10 (KCTD10), all of which influence HDL-C concentrations . This association has been consistently replicated in the subsequent studies [14–16]. MVK encodes the mevalonate kinase, which catalyzes an early step in the biosynthesis of cholesterol . MMAB encodes the enzyme which catalyzes the formation of adenosylcobalamin, a critical factor for degradation of cholesterol . KCTD10, which is close to MVK and MMAB genes, has shown to contribute to the susceptibility of obesity, diabetes and atherosclerosis . Therefore, MVK, MMAB and KCTD10 genes may be candidates as susceptibility genes modulating HDL-C concentrations and then affect the risk of dyslipidemia and CHD.
To determine whether polymorphisms in MVK, MMAB and KCTD10 are independently associated with the risk of dyslipidemia and CHD, we conducted a case–control study with 399 dyslipidemia cases and 465 controls in Han Chinese. In addition, for those loci showing significant associations with dyslipidemia, we further evaluated the associations between these polymorphisms and CHD risk including 697 CHD cases and 465 controls.
In this study, we performed a two-stage case–control study. The first-stage analysis was designed to discover the suggestive variants associated with dyslipidemia in a Chinese population consisting of 399 cases and 465 controls from a community based cohort study of non-infectious diseases in Changzhou and Nantong cities, Jiangsu Province, China. In this study, eligible subjects aged over 30 years old were enrolled in 2004 and 2007, and the baseline information including demographic, disease history and risk factors for chronic disease was obtained and a detailed clinical examination was conducted. Physical examinations, including measurements of height, weight and blood pressure as well as laboratory tests to measure total cholesterol (TC), triglycerides (TG), HDL-C and fasting plasma glucose concentrations, were performed for each subject. Fasting blood samples for routine laboratory examinations were obtained early in the morning after an overnight fast. All biochemical parameters were measured enzymatically on an auto-analyzer (Hitachi 7180 Biochemistry Auto-analyzer, Japan) according to the manufacturer’s instructions.
According to the Guidelines on Prevention and Treatment of dyslipidemia in Chinese Adults , 399 subjects with HDL-C <1.04 mmol/L were defined as cases with dyslipidemia (Low-HDL cholesterolemia), while 465 subjects not meeting this criteria were randomly selected and matched with the cases for age and sex. Subjects were excluded from the study if they had a history of diabetes, coronary heart disease or cancer, or those who were taking lipid-lowering medications.
The second-stage analysis was to determine whether the loci that influence the HDL-C levels in the first-stage also have an effect on CHD susceptibility, which consisted of 697 CHD cases from People's Hospital of Yixing City, Jiangsu Province, China and 465 controls defined in the first-stage. In brief, CHD cases were defined as having angiographic coronary stenosis with ≥50 % lumen reduction in at least one major epicardial coronary artery. All patients were genetically unrelated ethnic Han Chinese from Yixing city. After informed consent was obtained, the information of demographic characteristics, risk factors for CHD, history of vascular events and clinical diagnosis were written from the clinical records. A 5-ml venous blood sample was collected from each patient.
Based on the public HapMap SNP database (phase II + III Feb 09, on NCBI B36 assembly, dbSNP b126) and the HaploView 4.2 software, common SNPs (MAF ≥0.05) in the three genes (MVK, MMAB and KCTD10) were screened in gene regions (including 2-kb up-stream region of each gene) in Chinese Han population. A total of 21 potentially functional SNPs were selected after the prediction by using SNPinfo Web Server (http://snpinfo.niehs.nih.gov/) which is a comprehensive web-based tool designed to select SNPs based on GWAS results, linkage disequilibrium, and predict potential functional characteristics of polymorphisms. Besides, in order to validate the findings of GWAS [13, 15], rs2338104 and rs7134594 were also included. However, three SNPs were excluded for the failed probe design and two SNPs were removed due to genotyping failure (call rates <95 %). As a result, 18 loci were finally included in the current study. The linkage disequilibrium (LD) association for the 18 loci was further analyzed (Additional file 1: Figure S1).
Genomic DNA was isolated from leucocytes of venous blood by proteinase K digestion and phenol/chloroform extraction. All SNPs were genotyped by using the TaqMan OpenArray Genotyping System (Applied Biosystems lnc, USA). Fluorescence-based polymerase chain reaction (PCR) reagents were used to provide qualitative detection of targets using post-PCR (endpoint) analysis. A total volume of 5 μl with 2.5 μl TaqMan OpenArray Master Mix and 2.5 μl normalized human DNA sample (50 ng/μl) were loaded and amplified on customized arrays following the manufacturer’s instructions. Each 48-sample array chip contained two NTCs (no template controls). All 18 SNPs were successfully genotyped with call rates >95 %. Additionally, 10 % of samples were randomly selected for genotyping in duplicates and the results demonstrated a high degree of concordance (>99 %) among the duplicate pairs.
Data were shown as mean ± standard deviation (SD) or n (%). Differences in the distributions of demographic characteristics, selected variables and genotypes frequencies between cases and controls were analyzed by χ 2 test or Student t test. Hardy-Weinberg equilibrium was tested by a goodness-of-fit χ 2 test to compare the observed genotype frequencies to expected frequencies among the control subjects. Associations between the genotypes and dyslipidemia, CHD risk were estimated by computing the odds ratios (OR) and 95 % confidence intervals (CIs) from logistic regression analyses with adjustment for age, sex, smoking status and body mass index (BMI). The Chi-square-based Q test was used to test the heterogeneity of associations between subgroups. The effects of selected loci on plasma TC, TG and HDL-C concentrations were evaluated using the multiple linear regression method with adjustment for age, sex, smoking status and BMI. The significance level was set at P < 0.05 and P values were given for two-sided tests. All statistical analyses were performed using R software (Version 3.0.2, 2013-09-25; R Foundation for Statistical Computing, http://www.cran.r-project.org/). Data in this study was available (Additional file 2).
Characteristics of the subjects
The characteristics of the subjects are shown in Table 1. There were no statistically significant differences between the cases with dyslipidemia and the controls in terms of age, sex, and smoking status. BMI (P < 0.0001), TC (P < 0.0001) and TG (P < 0.0001) were significantly higher in cases with dyslipidemia compared with the controls. Mean HDL-C concentration in cases with dyslipidemia (0.81 ± 0.18 mmol/L) was significantly lower than that in controls (1.81 ± 0.31 mmol/L). Additionally, the mean age of the CHD cases (67.61 ± 11.13 years) were significantly higher than that of controls (49.48 ± 12.46 years). The proportion of male in the CHD cases (57.96 %) was higher as compared with those in controls (46.45 %) (P = 0.0001), whereas similar distributions of smokers were observed between groups (P = 0.051). Besides, TC (P < 0.0001) and TG (P < 0.0001) were significantly higher in the CHD cases than that in controls. HDL-C (P < 0.0001) concentration was significantly lower in the CHD cases compared with the controls.
Association analyses for dyslipidemia
The association results of 17 SNPs in codominant and additive models were described in Table 2. The SNP rs4499061 deviated from Hardy-Weinberg equilibrium among controls (P < 0.05) and was excluded from subsequent analyses. After adjustment of age, sex, smoking status and BMI, five polymorphisms (KCTD10 rs1477117, KCTD10 rs11066782, KCTD10 rs11613718, KCTD10 rs11615336 and MMAB rs12817689) showed significant associations with dyslipidemia risk in the codominant model (minor homozygote vs. major homozygote) and MMAB rs11067233 was significantly associated with dyslipidemia risk in the additive model.
Association analyses for plasma lipid concentrations
We examined the effect of these six loci on plasma TC, TG, or HDL-C concentrations, respectively, using a linear regression model with adjustment for age, sex, smoking status and BMI (Table 3). We found significant associations between rs11066782, rs11613718, rs11615336 and rs12817689 and TC (codominant model: P = 0.035, 0.025, 0.005 and 0.038, respectively), between rs1477117, rs11066782 and rs11615336 and TG (recessive model: P = 0.028, 0.015 and 0.031, respectively), between rs1477117, rs11066782, rs11613718 and rs11615336 and HDL-C (recessive model: P = 0.024, 0.007, 0.031 and 0.025, respectively), between rs11067233 and HDL-C (dominant model: P = 0.047). Additionally, the minor alleles of these associated SNPs were consistently associated with lower TC or TG levels and higher HDL-C levels.
Association analyses for CHD
To further evaluate the associations of the significant polymorphisms and CHD risk, we genotyped these six promising SNPs in another 697 CHD cases. As shown in Table 4, after adjustment of age, sex and smoking status, the minor alleles of rs11066782 in KCTD10, rs11613718 in KCTD10 and rs11067233 in MMAB were significantly associated with a decreased risk of CHD (additive model: OR = 0.71, 95 % CI = 0.53–0.97, P = 0.029 for rs11066782; OR = 0.73, 95 % CI = 0.54–0.99, P = 0.044 for rs11613718 and OR = 0.57, 95 % CI = 0.40–0.80, P = 0.001 for rs11067233).
Combined analyses were conducted to evaluate the cumulative effect of the three significant loci (Table 5). Intriguingly, we found a significant allele-dosage association between the number of favorable alleles and CHD risk (P trend < 0.001). Compared with individuals carrying no favorable allele, those who carried “1–2” and “3–4” favorable alleles had lower risk of CHD with adjusted ORs of 0.71 (0.50–0.99) and 0.33 (0.18–0.58), respectively. Individuals carrying “3–4” favorable alleles had a 62 % (OR = 0.38, 95 % CI = 0.21–0.66) decreased risk of CHD compared with those carrying “0–2” favorable alleles.
We also performed stratification analyses for the effect of rs11066782, rs11613718 and rs11067233 based on age, sex and smoking status (Additional file 3: Table S1). In ≥48 years group, rs11066782, rs11613718 and rs11067233 were significantly associated with a decreased risk of CHD after adjustment for the other covariates (OR = 0.70, 95 % CI = 0.50–0.97; OR = 0.71, 95 % CI = 0.51–0.99 and OR = 0.55, 95 % CI = 0.39–0.79, respectively). Sex stratification analysis indicated that rs11613718 had statistically associated with CHD in male (OR = 0.61, 95 % CI = 0.38–0.98) while rs11067233 had statistically associated with CHD in female (OR = 0.35, 95 % CI = 0.20–0.62) after adjustment for covariates respectively. Besides, rs11067233 was significantly associated with a decreased risk of CHD in never-smokers after adjustment for relevant covariates (OR = 0.37, 95 % CI = 0.23–0.59).
In this study, we investigated the relationship of 17 SNPs located in three genes (MVK, MMAB and KCTD10) with HDL-C concentrations and CHD risk in a Chinese population. We found that rs11067233 in MMAB, rs11066782 and rs11613718 in KCTD10 were associated with HDL-C concentrations and with CHD risk.
The KCTD10 gene, located on chromosome 12q24, is a member of the polymerase delta-interacting protein 1 gene family . Reports showed that KCTD10 was highly expressed in human heart, skeletal muscle, and placenta, and play a vital role in DNA synthesis by interacting with proliferating cell nuclear antigen and polymerase δ . In A549 lung adenocarcinoma cells, down-regulation of KCTD10 could inhibit cell proliferation . Transcription factors SP1 and AP-2α could bind to the promoter region of human KCTD10, and regulate its expression . A recent study revealed KCTD10 as a novel prognostic biomarker in gastrointestinal stromal tumor . According to Chen et al., Murine Kctd10 has been implicated in a metabolic network perturbed by loci contributing to the susceptibility of obesity, diabetes, and atherosclerosis . And by extension, the involvement of human KCTD10 in this metabolic network supports its association with HDL-C concentrations and CHD development. In the present study, we found, for the first time, that the minor alleles of rs11066782 and rs11613718 in KCTD10 were associated with higher HDL-C concentrations and lower CHD risk in a Chinese population. Since high levels of HDL-C could reduce the risk of ischaemic heart disease [8, 25], it is reasonable that the variant genotypes of the two polymorphisms may affect CHD susceptibility by increasing HDL-C concentrations. Located at intron 1 of KCTD10 gene, the two SNPs are in high linkage disequilibrium with each other (r 2 = 0.92), and both of them may affect gene expression by altering transcription factor binding sites (TFBS) of KCTD10 based on SNPinfo Web Server (http://snpinfo.niehs.nih.gov/). Analysis of Encyclopedia of DNA Elements data as implemented in online tool, RegulomeDB (http://regulomedb.org/), indicated that the two polymorphisms may influence the histone modifications and the expression of KCTD10, which may serve as regulatory variants in the development of coronary heart disease. Moreover, data from GTEx (http://www.gtexportal.org/home/) revealed that variant genotypes of the two potential SNPs were significantly associated with higher expression levels of KCTD10 in liver tissues in all HapMap subjects (P = 0.041 for rs11066782 and P = 0.038 for rs11613718, respectively; Additional file 4: Figure S2a, b). Besides, stratified analyses subsequently demonstrated that the protective effects of the variant genotypes were greater in those aged ≥48 years for rs11066782 and rs11613718, and greater in men for rs11613718 compared with other individuals. Since the prevalence of CHD increases with advancing age [26, 27] and is greater in men than women , it is reasonable that such genetic effects are more evident among the older people and men. Nevertheless, larger sample size and multi-ethnic population studies are warranted to support our findings.
In humans, MVK and MMAB are arranged in a head-to-head orientation on chromosome 12. Through a shared common promoter, MVK and MMAB are both regulated by sterol-responsive element-binding protein 2 (SREBP2), which is a transcription factor that controls cholesterol homeostasis . Furthermore, it is also reported that these two neighboring genes participate in metabolic pathways associated with HDL metabolism. MVK encodes for mevalonate kinase, which catalyzes an early step in the biosynthesis of cholesterol . Homozygosity for milder mutations in MVK could cause hyperimmunoglobulinemia D syndrome (HIDS), which is characterized by fever and increased levels of immunoglobulin D and A [29, 30]. In keeping with GWAS findings [13, 14], patients with HIDS have low HDL-C concentrations. However, in our study, neither rs3759387 in MVK nor rs2287218 in MVK showed a consistent result with the previous studies. The effects of SNPs on dyslipidemia might differ according to different ethnic background, as the rs3759387 T allele and rs2287218 T allele were found to be more enriched in the Caucasians than in Asians; Additionally, these discrepancies may be due to differences in lifestyle across populations. Functional characterizations are warranted to determine the causal variants related to plasma lipid concentrations in Asian populations. MMAB encodes the cob(I)alamin adenosyltransferase, an enzyme involved in the formation of adenosylcobalamin, necessary for degradation of cholesterol . In humans, deficiency of cob(I)alamin adenosyltransferase results in methylmalonic aciduria , and a negative correlation between urinary methylmalonic acid and red blood cell membrane cholesterol concentrations was also found in patients with schizophrenia . According to Junyent et al., homozygotes for major alleles at SNPs MMAB 3U3527G > C displayed lower HDL-C concentrations than carriers of the minor alleles when they consumed diets rich in carbohydrates . Besides, Marie et al. observed significant allelic expression imbalance of 22 % in MMAB (transcribed SNP rs11067231) and the allele associated with lower HDL-C level displayed greater MMAB transcript level. This result indicated that MMAB was a likely susceptibility gene influencing HDL-C levels . In addition, MMAB can affect TG levels through adenosylcobalamin, methylmalonyl-CoA mutase  and homocysteine [36, 37] based on several related function researches. In this study, we found that the variant genotypes of rs11067233 were associated with higher HDL-C concentrations and lower CHD risk. According to SNPinfo Web Server, rs11067233 may affect MMAB gene expression by altering microRNA binding at the 3′UTR of MMAB. Meanwhile, rs11067233 C > G could result in the loss of hsa-miR-603 binding to MMAB with energy change of 20.90, as predicted by miRNASNP v2.0 (http://bioinfo.life.hust.edu.cn/miRNASNP2/), which is a online database that predicts the effect (loss or gain of function) of miRNA-related SNPs based on miRNA expression data, GWAS information and experimental validation results. Additionally, data from GTEx project suggested that the variant genotypes of rs11067233 showed relatively lower expression levels of MMAB in liver tissues compared with homozygotes, although the difference did not reach the statistical significance level (P = 0.078; Additional file 4: Figure S2c). Moreover, Fogarty et al. also found that the C allele of rs11067233 demonstrated 15 % higher MMAB expression than the G allele in human hepatocytes . Taken together, it is plausible that rs11067233 is associated with MMAB gene expression, which therefore could alter serum lipid concentrations, and accordingly modify the risk of coronary artery disease. Notably, we found that rs11067233 genotypes were significantly associated with lower risk of CHD among never-smokers and females. As cigarette use is a well-established risk factor for CHD [38, 39] and most of the never-smokers in China are females, the protective effect of rs11067233 may be diluted by environmental risk factors if they do not have a joint effect. Anyhow, further investigations in relation to biological mechanisms may lead to important insights for these findings.
Several limitations of our study should be considered. Though we observed significantly main effects of three polymorphisms on CHD risk, only rs11067233 remained significant after Bonferroni correction for multiple comparisons (P < 0.010, Bonferroni-adjusted), suggesting that larger well-designed studies are warranted to confirm the associations identified in our study. Secondly, the sample size was moderate with limited power to detect significant associations. Thirdly, inherent selection bias could not be completely excluded due to the unbalanced matching in age and sex. Finally, some other confounding factors may potentially mediate the effect of selected polymorphisms on dyslipidemia and CHD risk such as alcohol consumption, physical activity, family history of cardiovascular diseases and so on. However, we applied a rigorous epidemiological design and laboratory tests and statistically adjusted for several known risk factors to minimize potential bias.
In conclusion, we found that rs11067233 in MMAB, rs11066782 and rs11613718 in KCTD10 were associated with higher HDL-C concentrations and lower CHD risk in a Chinese population. Further studies incorporating diverse populations and functional assays are required to validate and extend these findings.
Body mass index
Coronary heart disease
Genome-wide association study
Minor allele frequency
Polymerase chain reaction
Single nucleotide polymorphism
Transcription factor binding sites
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This study was financially supported by grants from the National Natural Science Foundation of China (No. 81102180 and No. 81390543), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) and Jiangsu Government Scholarship for Overseas Studies. The funders had no role in the design of the study and collection, analysis, and interpretation of data and in writing the manuscript.
Availability of data and materials
The dataset supporting the conclusions of this article is included within the article’s additional file.
SL, CS and HS designed the experiments. JS, YJ and JC performed the experiments. JD and GJ analyzed the data. JS, YQ and JW wrote the main manuscript. ZH and SL revised the manuscript. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
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Ethics approval and consent to participate
This study was approved by the Ethical Committee of Nanjing Medical University. Written informed consent was obtained from each participant before investigation.
The LD figure for the 18 loci included in this study. (DOCX 112 kb)
The dataset of this article. (CSV 145 kb)
Stratification analysis on the associations of rs11066782, rs11613718 and rs11067233 with coronary heart disease risk. (DOCX 16 kb)
Box plots showing gene expression levels by different variant genotypes identified from GTEx database. (DOCX 101 kb)
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Sun, J., Qian, Y., Jiang, Y. et al. Association of KCTD10, MVK, and MMAB polymorphisms with dyslipidemia and coronary heart disease in Han Chinese population. Lipids Health Dis 15, 171 (2016). https://doi.org/10.1186/s12944-016-0348-7