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GLUT4 gene rs5418 polymorphism is associated with increased coronary heart disease risk in a Uygur Chinese population

Abstract

Background

To explore possible associations between glucose transporter 4 (GLUT4) genetic polymorphisms in the patients with coronary heart disease (CHD) in Han and Uygur Chinese populations in Xinjiang, China.

Methods

Two GLUT4 polymorphisms (rs5418 and rs5435) were genotyped in 1262 Han (628 CHD patients and 634 healthy controls) and 896 Uyghur (397 CHD patients and 499 healthy controls) Chinese populations.

Results

In the Han Chinese population, there were no significant differences in allelic or genotypic distribution of rs5418 and rs5435 between the CHD and control groups (all P > 0.05). However, in the Uygur population, there were significant differences in genotype and allele distributions for rs5418 between CHD and the control group (all P < 0.05). Binary Logistic regression analysis showed that carriers with the rs5418 A allele had a higher risk of CHD compared to carriers of the rs5418 G allele (OR = 1.33, 95% CI: 1.069–1.649, P = 0.01), after adjustment for gender, age, drinking and smoking behavior, hypertension and diabetes. Furthermore, haploid association analysis of the two SNP loci of the GLUT4 gene showed that the AC haplotype was associated with CHD in the Uygur population (P = 0.001598; OR = 1.36, 95% CI = 1.1228–1.6406).

Conclusions

rs5418 GLUT4 gene variants are associated with CHD in the Uygur Chinese population.

Peer Review reports

Background

Coronary heart disease (CHD), also known as ischemic heart disease, is caused by myocardial ischemia and hypoxia due to changes in coronary circulation and represents the greatest mortality risk globally of all diseases. Prior reports suggest that ischemic heart disease causes 12.9 million deaths, accounting for one quarter of all global deaths annually, and is the main cause of death [1]. Many factors have been implicated in the development of coronary heart disease including smoking [2], obesity [3], sex [4], metabolic syndrome severity [5], glycerophosphocholine [6], dysglycemia and diabetes [7, 8], and sleep apnea syndrome [9, 10]. In addition to these environmental factors, several gene variants have been linked to the development and progression of CHD [11,12,13].

Glucose transporters (GLUT) are necessary for glucose uptake in cells of nearly all species [14]. Of the 14 known human GLUT genes, GLUT 1, 2, 3, and 4 have been implicated in human disease. In particular GLUT4 has been the subject of significant study as it is the main glucose transporter found in muscles and adipocytes [14]. This 12-transmembrane, 509-amino acid protein contains a large cytoplasmic loop between transmembrane helices 6 and 7 that is normally sequestered intracellularly in the basal state [15]. The cellular localization of GLUT4 is regulated by insulin through a complex mechanism, the aberration of which contributes to obesity [14]. The GLUT4 gene (also known as the solute carrier family 2, member 4 (17p13.2; OMIM 138190) encodes the GLUT4 solute carrier [16]. Many studies across multiple ethnicities have suggested a relationship between GLUT4 polymorphisms and human disease including insulin resistance [17,18,19], type 2 diabetes, [20] and obstructive sleep apnea syndrome [21]. However, few studies have investigated the association between the GLUT4 gene and CHD [22]. Thus, we aimed to evaluate a possible relationship between GLUT4 gene polymorphisms and CHD risk in Han and Uygur populations in Xinjiang, China.

Methods

Subjects

In this case–control study, patients with coronary angiography were recruited from the cardiovascular department of the First Affiliated Hospital of Xinjiang Medical University. The inclusion criteria for CHD are as follows: (1) older than 18 years of age, (2) a diagnosis of CHD according to the World Health Organization (WHO) CHD diagnostic criteria set in 1979, and (3) single vessel stenosis of > 70%, or multiple vessel stenosis of > 50%. The controls consisted of a random sample of adult’s individuals above 18 years of age who were visiting the hospital for a routine checkup and had medical records. The inclusion criteria were being devoid from any type of cardiovascular diseases and having a normal coronary artery with no evidence of plaque or peripheral vascular disease as confirmed by angiography, medical profile, or previous medical history as documented in their medical records. Individuals were excluded if they had the following conditions: cancer, acute or chronic inflammatory disease, cardiomyopathy or heart valve disease, variant angina without fixed coronary stenosis, coronary artery dilatation, X syndrome, serious liver disease (ALT > 2X normal), serious kidney disease (blood CR > 2.5 mg/dl), blood disease and pregnancy.

Clinical data collection

Baseline characteristics of all patients, such as sex, age, and smoking status were collected and are summarized in Table 1. Height and body mass were measured by a unified standard method, and patients' previous medical history such as hypertension, diabetes, abnormal blood lipid metabolism, and medications were recorded and used to diagnose related diseases in accordance with relevant Chinese or international standards [23, 24]. Habitual activities such as smoking and alcohol consumption behavior were collected from questionnaire.

Table 1 Baseline characteristic of the Han population

Blood biochemical indexes and DNA extraction

Cubital venous blood was collected from subjects after fasting for > 12 h. Blood biochemical indexes were tested by the Medical Laboratory Center of the First Affiliated Hospital of Xinjiang Medical University using the Abbott C16000 biochemical immunity instrument (United States). The Whole Blood Genome Extraction Kit (Tiangen Biochemical Co., Ltd.) was used to extract DNA from whole blood samples. A Nanodrop ND-2000 Ultramicro Nucleic Acid Analyzer was used to detect the concentration and purity of DNA, which was then diluted to 20 ng/ul.

Genotyping

In this study, single nucleotide polymorphisms (SNPs) were typed using the TM Multiple SNP Typing Kit (Shanghai Genesky Biotechnology). The SNP allelic site was identified using a high specificity ligase reaction. Then, the ligated products of different lengths were obtained by introducing varied length non-specific sequences at the end of the ligase probe and using a ligase addition reaction. The ligated products were PCR amplified using universal primers labeled with fluorescence, as shown in Supplementary material, and the amplified products were separated by fluorescence capillary electrophoresis. Finally, the genotypes of each SNP locus were obtained by analyzing the electrophoretic patterns.

Data analyses

SPSS 20.0 software was used for statistical analysis. Student t-test is applied for the continuous variables, while Pearson chi-square test is for categorical variables. Wilcoxon Rank-Sum test was applied for body mass index (BMI). The software program SHEsis or chi-square test (http://analysis.bio-x.cn) was used to assess Hardy- Weinberg equilibrium (HWE). PLINK (http://pngu.mgh.harvard.edu/purcell/plink/) software was used to analyze the allelic and genotypic association with disease [25]. Linkage disequilibrium (LD) plot was generated from Haploview version 4.2 (Broad Institute, Cambridge, MA, United States) [26]. Haplotype association analyses were performed with PLINK. Binary logistic regression, with the adjustment of covariates was applied to calculate the odds ratios (ORs) and 95% confidence intervals (CIs). Three logistic regression models (additive, dominant, and recessive) were also used to analyze the SNPs. All tests were two-tailed, and the results were considered significant when P ≤ 0.05.

Results

Baseline characteristics

The clinical characteristics of study subjects in the Han and Uygur populations are shown in Tables 1 and 2, respectively. Significant differences between both populations were noted in regard to gender (P < 0.001), age (P < 0.001), drinking and smoking behavior (P < 0.001), hypertension (P < 0.001) and diabetes (P < 0.001). Accordingly, these variants were used as the covariates in the following binary logistic regression analysis. No statically significant difference in the BMI was found between CHD patients and controls.

Table 2 Baseline characteristic of the Uygur population

Hardy–Weinberg analysis of the investigated SNPs

The Hardy–Weinberg analysis showed no deviations from Hardy–Weinberg Equilibrium for rs5418 and rs5435 in either the Han or Uygur populations.

Allelic and genotypic association with CHD

In the Han population, neither rs5418 nor rs5435 variants showed any significant differences in allelic frequencies and genotypic distribution between the CHD and control groups (all P > 0.05). However, in the Uygur population, the allelic frequencies of A and G at the rs5418 locus were 46.22 and 53.78% in the CHD group, and 39.28 and 60.72% in the control group, respectively, representing a significant difference in allelic distribution (P = 0.003, 95% CI = 1.10–1.61). The risk of having CHD in patients with the A allele was 1.33 times greater than that of the controls. The frequencies of the T and C alleles at the rs5435 locus in the Uygur CHD group were 33.12 and 66.88%, respectively, compared to 37.37 and 62.63% in the control group, respectively, representing no significant difference in the distribution of the alleles and genotypes between the two groups at the rs5435 locus (P = 0.06, OR = 0.83, 95% CI = 0.68–1.01). We conducted further binary logistic regressions based on the additive, dominant and recessive model after controlling for the influence of gender, age, drinking and smoking behavior, hypertension and diabetes, which revealed a significant association between the rs5418 locus and the risk of CHD under all the genetic models. Compared with the G allele, the A allele increased the risk of coronary heart disease 1.33×. These data are summaries in Tables 3, 4 and 5.

Table 3 Allelic association analysis between two SNPs and CHD
Table 4 Genotypic association analysis between two SNPs and CHD
Table 5 Logistic regression analysis of GLUT4 polymorphisms and risk of coronary heart disease in the Uygur population

We explored the correlations between rs5418 and other risk factors. There are no association identified between rs5418 and most of the risk factors. In Uygur population, genotype of rs5418 was significantly correlated with smoking behavior (Additional file 1: Tables S1, S2).

Haplotypes associated with CHD

Additional file 2: Figure S1 was included to show the linkage disequilibrium for the two investigated SNPs. In the Han population, haploid frequency analysis of two GLUT4 SNP loci identified three haplotypes at the two loci, yet there was no significant difference in the distribution of these haplotypes in the Han population (P > 0.05). In the Uygur population, haploid frequency analysis of two GLUT4 SNP loci identified four haplotypes. In particular, AC haplotype distribution was significantly different between the CHD and control groups in the Uygur population (P < 0.05) and the risk of developing CHD increased 1.36 for the AC haplotype carriers (Table 6).

Table 6 Association of haplotypes with CHD

Discussion

Previous studies have shown close relationships between the incidence of CHD and LAP (liver-enriched transcriptional activator protein), (IL)-1 (interleukin 1), IL-18 (interleukin 18), ANGPTL4 (Angiopoietin-like 4), and PIN1 (Peptidylprolyl Cis/Trans Isomerase, NIMA-Interacting 1) [27,28,29,30,31] but few studies have investigated the association between GLUT4 polymorphisms and CHD. We studied GLUT4 polymorphisms and potential associations with CHD in multiple ethnic groups within a Chines population and identified a specific GLUT4 gene polymorphism that is significantly associated with the risk of developing CHD in the Uygur Chinese population.

GLUT4 is the primary glucose transporter in the human heart, which accounts for approximately 70% of all glucose transport [32]. In heart diseases like cardiac hypertrophy, heart failure, and myocardial ischemia different perturbations in expression of glucose transporters are observed, especially in GLUT1 and GLUT4, due to changes in heart glucose metabolism. GLUT4 is translocated to the cell surface in response to ischemia, insulin, and catecholamines, allowing it to increase glucose transport into cardiomyocytes. However, in the absence of stimulation, GLUT4 is trapped intracellularly [33]. Ischemia, as seen in CHD, results in increased myocardial glucose utilization derived from glycogen breakdown [34] and also leads to increased glucose transport activity [35]. The increase in glucose uptake is due to the transport of GLUT1 and GLUT4 from the intracellular ventricle to the sarcolemma. Many studies have reported GLUT4 gene polymorphisms in association with type 2 diabetes [20, 36,37,38], but there are few investigations of possible GLUT4 gene polymorphisms in CHD patients.

Of the known GLUT4 polymorphisms, rs5418 is located in the gene promoter region [39]. One prior study in a south India population found that the GLUT4 gene was detected in normal glucose tolerance and type 2 diabetes, and found differences in the ACGT haplotype of rs5418 [20]. Another study found that the rs5418 locus is associated with HBA1c levels in Japanese males [40]. The rs5418 locus has also been linked with obesity despite a similar allelic and genotypic distribution in extremely obese children and adolescents compared to normal and underweight patients, suggesting that these alleles are not involved in weight regulation [41]. The rs5435 locus was reported associated with risk of CHD in Han population in Guangdong province [22]. However, no significant association with CHD in Han and Uygur population in our study in allice and genotype distribution. The reason might be low sample size decreased the statistical power, since a significant trend was identified in logistic model under dominant model.

In this study, we found that the genotypic and allelic frequencies of rs5418 locus were not significantly different in either the CHD or the control group of a Han Chinese population. However, in the Uygur population, we found that the distribution frequencies of the three genotypes and alleles in the two groups were significantly different. Differences in findings between these populations are likely related to the races studied. As a multi-ethnic region, Xinjiang has 45 ethnic groups, in addition to the Han and Uygur populations. In addition to the different genetic backgrounds of these groups, there are a variety of cultural and lifestyle differences that may also play a contributing role. Our findings that the AA genotype and the A allele at the rs5418 site GLUT4 gene are associated with susceptibility to CHD in the Uygur Chinese population, it may be beneficial provide for future clinical diagnosis and treatment. This study was limited to only patients from two ethnic groups in Xinjiang, China. Future studies should include more ethnic groups from this area or study populations in other regions of China or worldwide. Further functional validation of increased susceptibility to CHD development is also needed to confirm a definitive role of rs5418 site mutations in the GLUT4 gene and elucidate the effects of these mutations on CHD pathogenesis or etiology.

Conclusions

GLUT4 gene polymorphisms at the rs5418 site were associated with CHD susceptibility in the Uygur, but not Han, Chinese population of Xinjiang, China.

Availability of data and materials

The datasets of genotyping data in the current study are available as the PLINK binary format in the Github repository [https://github.com/2022yufei/genotyping].

Abbreviations

CHD:

Coronary heart disease

GLUT4 :

Glucose transporter 4 gene

SNPs:

Single nucleotide polymorphisms

PCR:

Polymerase chain reaction

HWE:

Hardy–Weinberg equilibrium

OR:

Odds ratio

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Acknowledgements

In this study, the authors thank all the organizations, individuals, and participants who supported this project.

Funding

This study was supported in part by grants from the National Natural Science Foundation of China (#8170020548 and #8177021253).

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Authors and Affiliations

Authors

Contributions

YNY and FL conceived and designed the experiment. JYZ, QZ, and JYL collected blood samples and extracted DNA. Study quality control and modification were performed by XML, YNY and FL. Data analyzing and paper writing were done by FY. In the final version of the manuscript, all authors approved.

Corresponding author

Correspondence to Yi-Ning Yang.

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This study was approved by the ethics committee of the First Affiliated Hospital of Xinjiang Medical University (Amend number: 20100116-01). All patients who participated in this study signed informed consent.

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The authors declare that they have no competing interests.

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Supplementary Information

Additional file 1: Table S1.

Baseline characteristic of the Han population according to the genotype of rs5418. Table S2. Baseline characteristic of the Uygur population according to the genotype of rs5418.

Additional file 2: Figure S1.

Haploview analysis for D' and r2 pairwise measures of LD between rs5418 and rs5435. D' values and confidence levels (LOD) are represented as black for D' = 1, LOD > 2; shades of pink for high D', LOD < 2; white for D' < 1, LOD < 2. r2 values are represented as black for r2 = 1, white for r2 = 0, with intermediate values for 0 < r2 < 1 indicated by shades of grey. The numbers within the squares represent the D' or r2 scores for pairwise LD.

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Yu, F., Liu, F., Li, XM. et al. GLUT4 gene rs5418 polymorphism is associated with increased coronary heart disease risk in a Uygur Chinese population. BMC Cardiovasc Disord 22, 191 (2022). https://doi.org/10.1186/s12872-022-02630-9

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Keywords

  • Coronary heart disease
  • Glucose transporter 4 gene
  • Single nucleotide polymorphism
  • Susceptibility gene