Abstract
Hyperuricemia (HUA) is associated with dietary and genetic factors. However, studies on dietary patterns and their interaction effect with genes on the risk of HUA are limited. We aimed to explore the association between dietary patterns and HUA, and dietary patterns—gene interactions on the risk of HUA. A population-based cross-sectional study was conducted in adults aged 18 and older in Liangshan Yi Autonomous Prefecture of China. Dietary consumption was collected using a standard Food Frequency Questionnaire. Vein blood samples were collected after overnight fasting, and DNA was extracted from peripheral blood leukocytes. Dietary patterns were derived using principal component and factor analysis. Of the 2646 participants, the prevalence of HUA was 26.8%. Three dietary patterns were classified. Of them, a dietary pattern with higher meat consumption (defined as meat-based) had the strongest association with HUA than a dietary pattern with plant-based or local special diet-based. A higher frequency of T allele at ABCG2 rs2231142 and SLC2A9 rs11722228 loci was observed in participants with HUA than those without HUA. An additive interaction of meat-based dietary pattern with rs2231142 locus was significantly associated with an increased risk of HUA. The relative excess risks of interaction, attributable proportion of interaction, and synergy index (S) were 0.482 (95% CI: 0.012–0.976), 0.203 (95% CI: 0.033–0.374), and 1.544 (95% CI: 1.012–2.355), respectively. In conclusion, a dietary pattern with meat-based was significantly associated with an increased risk of HUA. There was an additive interaction between a meat-based dietary pattern and the ABCG2 rs2231142 locus. Individuals with rs2231142 T allele were at higher risk of HUA than those with rs2231142 GG allele.
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Introduction
Hyperuricemia (HUA) is a purine metabolic disorder. The most well-known disease induced by HUA is gout, but many studies have reported that HUA also plays an important role in cardiac-kidney-vascular system diseases and metabolic syndromes (Mets)1. A meta-analysis in 2015 reported that the pooled prevalence of HUA is 13.3% in China2. A national survey in the US found that the prevalence of HUA is substantial, with 20.2% in males and 20.0% in females aged 20 years and older3. HUA has become the second most common metabolic disorder after diabetes mellitus1.
The known risk factors for HUA include genetic and environmental factors as well as interactions between them1. Recent genome-wide association studies (GWAS) have identified significant associations between single nucleotide polymorphisms (SNPs) in ABCG2 and SLC2A9 in HUA cases4. Studies have shown that a mutation at the rs2231142 locus of ABCG2 can cause a 53% reduction in ABCG2-mediated serum uric acid (SUA) transport5. It is reported that the variation at the rs11722228 locus of SLC2A9 can also affect the transport and reabsorption of SUA, and the rs11722228 locus of SLC29 can explain 1.03% of the variation in SUA levels in the Chinese population6.
Along with inherited genetic variants, specific dietary components also play a significant role in the development of HUA7. Previous studies have reported that red meat, seafood, and alcohol consumption are associated with the risk of HUA8,9. However, most of the existing research focuses on the effects of a single food or nutrient rather than the interaction between multiple food items, which may be more relevant to the study of disease association10,11. The dietary pattern method uses complex combinations of foods and nutrients to investigate the association between multiple food items and disease12. A cross-sectional study found that the ‘animal and fried foods’ pattern was associated with a higher prevalence of HUA13, while another study demonstrated that there was no significant association between dietary patterns and HUA in the Chinese population11. Hence, the association between dietary patterns and HUA remains unclear.
Potential gene-environment interactions are key features in the development of complex diseases, including HUA and gout14. Evidence has suggested that the intake of sugar-sweetened beverages and SLC2A9 variants interact in the pathogenesis of gout15. However, there are few studies on diet and gene interaction in HUA7,14,15,16. To our best knowledge, no study has examined the relationship of dietary patterns and gene interaction with the risk of HUA among the Chinese population.
The Liangshan Yi Autonomous Prefecture is located in southwestern Sichuan province, where the indigenous Yi ethnic group maintains its unique dietary culture17. Our previous study found that the prevalence of HUA among adult Yi people was 22%, which was significantly higher than that in the other areas of China18. Therefore, we aimed to identify and examine the association between dietary patterns and risk of HUA, as well as to explore whether there is an interaction effect of dietary patterns and gene on the risk of HUA among the adult of Yi population in China.
Methods
Study design and population
A cross-sectional study was conducted among the Yi people in the Liangshan District, Sichuan Province, China, from July 2014 to February 2016. A randomized sample of 3188 participants aged 18 and older was obtained using a multistage stratified cluster sampling method. Details of the study design were described in our previous study19. In the analysis, we excluded participants who had unretained blood samples and those with incomplete dietary questionnaires. We also excluded participants with cardiovascular diseases or those with medication use that may affect serum uric acid concentration. Therefore, the final study sample size was 2646. The study protocol was approved by the Ethics of Research Committee of Southwest Medical University. All survey methods were performed in accordance with relevant guidelines and regulations. All participants provided informed consent.
Questionnaire survey
The on-site survey was conducted by well-trained investigators through face-to-face interviews. Participants were asked to complete a questionnaire that included demographic and lifestyle information. Dietary intake was assessed using a semi-quantitative 52-item food frequency questionnaire (FFQ) that inquired on the types of food intake, frequency (daily, weekly, monthly, yearly, or never), and the amount of food consumed over the past year (serving size per gram). The FFQ was designed based on culture-specific dishes, tested using a local sample to check and validate its applicability for the Yi culture. Alcohol consumption was calculated based on the frequency of drinking and consumption of different alcoholic beverages.
Physical examination
Height and weight were measured by trained investigators to the nearest 0.1 cm and 0.01 kg. Body mass index (BMI) was calculated by weight/height2 (kg/m2). Blood pressure (BP) was measured twice from the upper left arm after 5 min rest in a seated position. Waist circumference (WC) was measured with a non-retractable tape measure to the nearest 0.1 cm at the umbilical level, with the participants standing and breathing normally. Hip circumference was measured to the nearest 0.1 cm around the symphysis pubis and the posterior gluteus maximus.
Assessment of hyperuricemia and other biomarkers
HUA was defined as serum uric acid (SUA) concentrations > 420 μmol/L (7.0 mg/dL) for males and > 360 μmol/L (6.0 mg/dL) for females1. Overnight fasting blood samples were collected from each participant. SUA, triglycerides (TG), total cholesterol (TC), fasting plasma glucose (GLU), high-density lipoprotein cholesterol (HDL-C), and low-density lipoprotein cholesterol (LDL-C) were measured using an automatic biochemical analyzer (Mindary, BS-820, Shenzhen, China).
Genomic DNA extraction and genotyping
Genomic DNA was extracted from peripheral blood leukocytes, and a Nano Drop 2000 ultraviolet spectrophotometer was used to measure its quantity and quality. Genotyping was performed by Kompetitive Allele Specific PCR (KASP). The detection success rates of the ABCG2 rs2231142 and SLC2A9 rs11722228 loci were 99% and 97.2%, respectively. The SNPs were selected based on the following criteria: (1) SNP with P < 1.0 × 10−5 for all GWAS samples; (2) when multiple SNPs had a strong LD (r2 ≥ 0.8), SNPs previously reported in the literature were used prior to selection; (3) clear genotyping clusters, and (4) Minor Allele Frequency (MAF) ≥ 0.05. Based on quality control criteria, SNPs were excluded when the P < 0.001 for the Hardy–Weinberg equilibrium (HWE) test, MAF < 0.01, or genotype call rate < 95%.
Classification of dietary patterns
According to the Food Composition Table, the similarity of nutrient profiles, and purine contents, we collapsed 52 food items into 17 food groups. The Kaiser–Meyer–Olkin (KMO) measure of sampling adequacy and Bartlett’s sphere test were used to evaluate the adequacy of correlation matrices with the data. Principal component analysis (PCA) and factor analysis (FA) were applied to classify dietary patterns. Varimax rotation was applied to maximize high- and low-value factor loadings and minimize mid-value factor loadings. After evaluation of eigenvalues > 1, the cumulative contribution rate, and the scree plot, three factors were determined. Food items with a factor loading > 0.30 (absolute value) were regarded as the main components of each pattern. The higher the factor loading of a food group, the greater the contribution of that group to the pattern. The labeling of dietary patterns was based on the interpretation of foods with high factor loadings for each pattern20. Dietary pattern scores were calculated by summing the product of the standardized intake for each group multiplied by the regression coefficients before they were categorized into quartiles (Qs).
Statistical analyses
The factor scores of each dietary pattern were divided into quartiles, with Q4 and Q1 the highest and lowest categories for the intake of each dietary pattern, respectively. The association between the quartile categories of dietary pattern scores and HUA was examined using logistic regression analysis. Data for continuous variables are presented as mean ± standard deviation. Categorical variables were generally reported as the sum (percentage) and tested using Chi-square test. The Kaiser–Meyer–Olkin (KMO) measure of sampling adequacy (0.727) and Bartlett’s test of sphericity (P < 0.001) showed that the factor model as a whole was significant. The additive interaction was measured using the Delta method described by Rothman et al.21, while the parameter estimates and covariance matrix of the logistic regression model were substituted in the Excel program developed by Andersson et al.22 to calculate the additive interaction index. The indicators used for evaluating the additive interaction included the excess relative risk (RERI), attributable proportion (AP), and synergy index (S). If the 95% CI of RERI and AP were > 0, and the 95% CI of S > 1, there was a synergistic interaction between the dietary pattern and the gene in HUA. Data were analyzed using SPSS software (SPSS Inc. Version 24). All P values were two-tailed, and the difference was considered significant when P < 0.05.
Results
Characteristics of participants
Figure 1 shows the participant flowchart. Of the total analysis sample of 2646 participants (1445 males and 1201 females), the prevalence of HUA was 26.8% in both genders, 34.9% in males, and 17.2% in females. There were significant differences in age, gender, ethnicity, education, and occupation between subjects with and those without HUA. Compared with those without HUA, subjects with HUA had significantly higher means of SUA, TC, and TG, as well as higher WC, WHR, BMI, and BP (Table 1).
Dietary patterns
Three major dietary patterns were identified by factor analysis among the participants (Table 2). Factor 1 was defined as the meat-based dietary pattern and characterized by a high intake of animal organ meats, seafood, fresh meat, and eggs; factor 2 was characterized as a plant-based dietary pattern and included the intake of mushroom algae, beans, and their products, nuts, and fruits; and factor 3, was the local special dietary pattern was characterized by the intake of marinated smoked meat and grease. These three patterns accounted for 33·87% of the total variance, with the ‘meat-based,’ ‘plant-based,’ and ‘local special’ dietary patterns constituting 12.64%, 12.54%, and 8.69% of the total variance, respectively.
Association between dietary patterns and HUA
Table 3 shows that subjects with the meat-based dietary pattern had a significantly high prevalence of HUA. Compared to those in the lowest quartile of the dietary pattern scores, the crude OR of HUA for those in the highest quartile was 1.878 (95% CI = 1.461–2.415, P < 0.001). This association remained significant after adjustment for age, BMI, gender, and ethnicity (OR = 1.389, 95% CI: 1.039–1.858, P = 0.027). There were no significant associations of the other two dietary patterns with the risk of HUA after these adjustments.
Hardy–Weinberg equilibrium test and genotype frequency distribution
The allele frequencies for both SNPs in the ABCG2 case group (\(\chi^{2}\) = 0156, P = 0.925), control group (\(\chi^{2}\) = 0.303, P = 0.859), SLC2A9 case group (\(\chi^{2}\) = 0.156, P = 0.925), and control group (\(\chi^{2}\) = 0.683, P = 0.711) were not significant in Hardy–Weinberg equilibrium (P > 0.05). The results reveal that the participants analyzed in the study had an adequate group representation. Table 4 displays the genotype frequency distribution of the ABCG2 and SLC2A9 genes. For both loci, the T allele in the HUA group was higher than the non-HUA group.
Different genotypes and HUA
Figure 2 shows that compared to the GG wild-type genotype at the rs2231142 locus in ABCG2, the risk of HUA increased with the number of T alleles. Compared to the GG wild-type genotype, the risk of HUA in subjects with GT and TT mutant genotypes was 1.899 times higher (95% CI: 1.578–2.285) and 3.546 times higher (95% CI: 2.425–5.185). After adjustment for age, gender, BMI, ethnicity, occupation, and educational level, the association between the rs2231142 locus and HUA was still significant (P < 0.001).
A similar relationship was observed in the rs11722228 locus in SLC2A9. Compared with the CC wild-type genotype, the CT and TT mutant genotypes increased the risk of HUA by 21.1% (OR = 1.211, 95% CI: 0.999–1.469) and 41.6% (OR = 1.416, 95% CI: 1.037–1.935) after adjustment for the confounders.
Interaction analysis between dietary patterns and genetics
There was no evidence that the three dietary patterns had multiplication interaction effects on HUA risk in combination with the ABCG2 rs2231142 and SLC2A9 rs11722228 loci. Therefore, we further examined whether there were additive interaction effects of dietary patterns and genes on the risk of HUA.
In the analysis, three dietary pattern scores were dichotomized as two quantiles, with the low quantile as the reference and the rs2231142 locus referenced with the GG wild-type genotype. There was an additive interaction between meat-based dietary pattern and the rs2231142 locus on the risk of HUA; the RERI, AP, and S were 0.482 (95% CI: 0.012–0.976), 0.203 (95% CI: 0.033–0.374), and 1.544 (95% CI: 1.012–2.355), respectively (Table 5, Fig. 3). The other two dietary patterns had no additive interactions with the rs2231142 locus, with 95% CIs of RERI and AP including 0, and the interaction coefficient S including 1. Using the CC wild-type genotype as a reference, the results showed no additive interaction between the rs11722228 locus and the three dietary patterns.
When the average SUA levels of each genotype at the ABCG2 rs2231142 locus were compared under the "animal diet pattern" quartile, that SUA levels increased with the number of T risk alleles (GG → GT → TT). In addition, the SUA level increased as the "meat-based dietary pattern" factor score increased in the same genotype (Fig. 4).
Discussion
In this study, three dietary patterns were identified among the Yi people who lived in the Liangshan District of Sichuan Province, China. These three dietary patterns were meat-based, plant-based, and specific cuisine. The main finding of this study is that the meat-based food pattern, which is characterized by a high intake of animal organ meats, seafood, fresh meat, and eggs, was positively associated with an elevated risk of HUA, whereas no significant association was observed between the other two dietary patterns and HUA risk.
To date, several studies have explored the association between diet and HUA. A cross-sectional study demonstrated that animal products and fried food patterns that are rich in pork, eggs, animal giblets, poultry, and fried wheat, was positively associated with a higher prevalence of HUA13. He et al.23 found that a meat food pattern characterized by the intake of poultry, beef, processed and cooked meat, eggs, and fats, was associated with an elevated risk of HUA. In contrast, a study in Taiwan showed that after adjusting for age, gender, and body mass index, the significant level of the relationship between the dietary pattern and HUA were attenuated11. Another study suggested that compared with individuals in the lowest quintile, those in the highest quintile of meat and seafood intake experienced an increased risk of gout8. Our results also show that the proportion of alcohol consumption in those with HUA was much higher than that in those without HUA24. Alcohol consumption may increase the risk of HUA. The higher rate of alcohol consumption was largely related to the local lifestyles where people like to have alcohol consumption17.
Our study observed a positive and significant association between the meat-based dietary pattern and the prevalence of HUA. This finding is consistent with previous reports13,23. The mechanism that has been proposed to explain this association is that animal meat-based foods contain high purines. Excessive intake of purines would lead to an increase in SUA levels, subsequently increasing the risk of HUA8. Our previous study found that people in the Liangshan area are more likely to drink broth, and the meat consumed is mainly fresh pork fat17, which contains more purines and saturated fatty acids. The consumption of animal foods, especially the calories and fat in red meat, leads to centripetal obesity that is an established factor for an increase in plasma insulin levels. Studies have shown that plasma insulin concentrations are significantly associated with HUA13,25. A previous study observed that a dietary pattern with increased soybean product and fruit intakes was negatively associated with the prevalence of HUA13. Fruits and vegetables can provide rich dietary fiber and their antioxidant components, which have protective effects against HUA10. However, in the study, we did not observe a significant association of plant-based and local dietary patterns with a risk reduction of HUA. We are unable to explain this finding using the current dataset. Further research is warranted.
The heritability of SUA concentration is approximately 40–70%26. Previous GWAS studies suggested an association between HUA susceptibility relative to dysfunctional ABCG2 variants, with the rs2231142 locus being the most common variant27. In our study, we found that individuals with the ABCG2 rs2231142 T allele had a higher frequency of HUA and SUA than those with the rs2231142 GG allele. This finding was consistent with results reported in the United States28 and in Mexico29. ABCG2 is a high-capacity urate transporter that plays a key role in renal urate overload27. The risk of HUA that is attributed to ABCG2 variants is 29.2%, which is much higher than other typical environmental risks30. Our findings suggest that the rs2231142 locus variants in ABCG2 might be extremely important in the pathogenesis of HUA. This result supports the important strategy of ABCG2 genotyping applied in the screening of individuals with a high risk of HUA27.
The SLC2A9 gene encodes two GLUT9 isoforms of class II facilitative glucose transport family7. A previous study reported that the rs11722228 locus of SLC29 can explain 1.03% of the variation in SUA levels in the Chinese population6,31. Doring et al. reported that the most significant SNPs associated with SUA were within the SLC2A9 gene32. Our study also found that the SUA level in individuals with the rs11722228 locus showed increased instances of the T allele and was higher in the HUA population than in the non-HUA population.
Longitudinal studies have found that some individuals are more sensitive to unhealthy diets, reflecting the complex interaction between genetic factors and diet14. In this study, we found an additive interaction between a meat-based dietary pattern and the rs2231142 locus of ABCG2. Under the same dietary pattern factor score, the increase of the T allele at the rs2231142 locus was associated with increased SUA levels. Moreover, individuals with this genotype also exhibited SUA levels that increased with the dietary pattern factor score. Similar to our results, Beydoun et al.7 reported that 12 SNP sites (including ABCG2 and SLC2A9) are closely related to SUA and found that there was a synergistic interaction between the genetic risk score (GRS) and red meat intake that increased the risk of increased SUA among women. In addition, a population-based study in Malaysia33 showed that SUA concentration is affected by the interaction of a ‘fruit diet pattern’ and the VEGFR-2 rs2071559 locus, suggesting that fruit consumption may play a role in enhancing or suppressing the effects of VEGFR-2 polymorphisms. Studies have shown that people of Han-Chinese could be inherently predisposed to higher risk for HUA and gout compared with other populations, which may partly explain the finding of no association between a plant-based diet and the ABCG234.
To the best of our knowledge, there are four main studies that examined the interaction effect of diet and gene expression on HUA7,14,15,16. These results support the hypothesis that different dietary intakes can enhance or weaken the impact of genes on blood UA level and HUA. However, only one study included the rs2231142 and rs11722228 loci7, and none of these studies were conducted among a Chinese population. Our study used a large sample size and careful study design to add new evidence of diet and genetic interactions on HUA prevalence in the Chinese people to the field. The findings of this study will provide new and necessary insight into HUA and assist in developing intervention strategies.
Most studies on the interaction between diet and genetics in China have focused on diseases such as Mets35 and obesity36. Our study is among the few to explore the influence of dietary patterns and gene interactions on HUA. We also evaluated dietary patterns using FFQ, which consists of purine-containing foods and beverages commonly consumed by the Chinese population. This is important because the dietary structure is a key factor for assessing the prevalence of HUA within populations37. In addition, information from the questionnaires was collected by trained investigators, and thus our results are reliable.
This study had several limitations. First, it is a cross-sectional study, and the SUA level was only a one-time measurement. Second, the information about food consumption may have recall bias. Although we adjusted for potential confounding variables, we were unable to control for the effect of unmeasured confounding factors. Third, we only focused on two SNPs closely related to HUA. There could be other SNPs in different genes that may also contribute to diet-gene interactions, limiting analyses to these two genes could have biased the results. Therefore, more SNPs will be considered in further research.
In conclusion, a higher adherence to a meat-based dietary pattern was associated with a higher prevalence of HUA in the Yi ethnic group of the Chinese population. There was a significant additive interaction between the meat-based dietary pattern and the ABCG2 rs2231142 locus on the risk of HUA. The findings of the study provide new insights into intervention strategies and health policy for controlling the risk of HUA among the Chinese population. Further prospective studies are needed to confirm these findings.
Data availability
Data described in the manuscript, codebook, and analytic codes cannot be made available due to the University Institution Review Board requirement.
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Acknowledgements
We would like to express our great appreciation to all the participants in the study for their time and cooperation. Our thanks also go to the support from the Center of Disease Control and Prevention (CDC) of the Liangshan Prefecture, faculty members and research students from Southwest Medical University, and Editage (www.editage.cn) for English language editing.
Funding
This work was supported by the Danone Dietary Nutrition Research and Education Fund of Danone Institute (China) under Grant Number DIC2013-03.
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H.J.: designed the research project; L.J.L.: provided comments and critical review of the manuscript; T.T.L.: analyzed the data and was primarily responsible for the final content of the manuscript. All authors wrote the paper and read and approved the final manuscript.
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Li, T., Li, S., Tian, T. et al. Association and interaction between dietary patterns and gene polymorphisms in Liangshan residents with hyperuricemia. Sci Rep 12, 1356 (2022). https://doi.org/10.1038/s41598-021-04568-y
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DOI: https://doi.org/10.1038/s41598-021-04568-y
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