- Open Access
Polymorphisms of genes involved in lipid metabolism and risk of chronic kidney disease in Japanese - cross-sectional data from the J-MICC study
Lipids in Health and Disease volume 13, Article number: 162 (2014)
Chronic kidney disease (CKD) is known to be one of the causes of cardiovascular disease and end-stage renal disease. Among the several treatable risk factors of CKD, that of dyslipidemia is relatively controversial. To clarify the association of polymorphisms in genes involved in lipid metabolism with the risk of CKD in the Japanese population, we used cross-sectional data from the Japan Multi-Institutional Collaborative Cohort (J-MICC) Study.
A total of 3,268 men and women, aged 35–69 years, were selected from J-MICC Study participants for inclusion in this study. Twenty-eight candidate single nucleotide polymorphisms (SNPs) were selected in 17 genes associated with the risk of lipid metabolism disorders, and genotyping of the subjects was conducted using the multiplex PCR-based invader assay. The prevalence of CKD was determined for stages 3–5 (defined as estimated glomerular filtration rate <60 ml/min/1.73 m2).
Logistic regression analysis revealed that SNPs APOA5 T − 1131C (rs662799), APOA5 T1259C (rs2266788), TOMM40 A/G (rs157580), and CETP TaqIB (rs708272) were significantly associated with CKD risk in those individuals genotyped, with age- and sex-adjusted odds ratios (ORs) per minor allele (and 95% confidence intervals (CIs)) of OR 1.22 (95% CI: 1.06–1.39), 1.19 (1.03–1.37), 1.27 (1.12–1.45), and 0.81 (0.71–0.92), respectively. Analysis of the gene–environment interaction revealed that body mass index (BMI) was a significant effect modifier for APOA5 T − 1131C (rs662799) and a marginally significant effect modifier for APOA5 T/C (rs2266788), with the interaction between BMI ≥30 and individuals with at least one minor allele of each genotype of OR 10.43 (95% CI: 1.29–84.19) and 3.36 (0.87–13.01), respectively.
Four polymorphisms in APOA5, TOMM40, and CETP were shown to be significantly associated with CKD risk, and a significant interaction between the two APOA5 SNPs and BMI on CKD risk was also demonstrated. This suggests the future possibility of personalized risk estimation for this life-limiting disease.
Chronic kidney disease (CKD) is emerging as a major public health and financial burden worldwide, and the number of affected patients is increasing in East Asian countries such as Japan, where more than 10 million people currently have CKD stage ≥3. CKD is also known to be a cause of cardiovascular disease (CVD) and end-stage renal disease, so prevention of this potentially life-limiting disease is becoming a pressing issue . CKD has a number of treatable risk factors, such as diabetes mellitus, hypertension, glomerular nephritis, and dyslipidemia . Of these, the effect of dyslipidemia on human CKD risk is relatively controversial, although substantial evidence from animal models is supportive of this association [3, 4], suggesting that dyslipidemia plays an important role in the development and progression of CKD. Additionally, data from 4,483 healthy men participating in the Physician’s Health Study showed that elevated total cholesterol, high non-high-density lipoprotein (HDL) cholesterol, a high ratio of total cholesterol to HDL cholesterol, and low HDL cholesterol in particular were significantly associated with an increased risk of developing renal dysfunction with an initial creatinine level <1.5 mg/dl . Some other reports also suggested that blood lipids modify the decline in renal function as well as hypertension [6, 7].
In 2005, we launched the Japan Multi-Institutional Collaborative Cohort (J-MICC) Study, a large genome cohort study to confirm and detect gene–environment interactions in lifestyle-related diseases, particularly cancer [8, 9]. Considering the potentially important roles of lipid metabolisms in the etiology of CKD, we hypothesized that genetic polymorphisms modulating lipid metabolizing pathways would also affect CKD risk in humans. Accordingly, to clarify the association of polymorphisms in genes involved in lipid metabolism with CKD risk, we examined this in Japanese subjects using the cross-sectional data of the J-MICC Study.
Subject characteristics and allele frequencies of genes involved in lipid metabolism
Subject characteristics are summarized by CKD status in Table 1. The mean age ± standard deviation was 56.6 ± 8.6 years, and 48.6% of all subjects were men. Subjects with CKD accounted for 17.3% (564/3,268) of the entire study population. Estimated glomerular filtration rate (eGFR), age, systolic blood pressure, total cholesterol, uric acid, use of anti-hypertensive or lipid-lowering drugs, history of CVD or cerebrovascular disease, and current smokers were all significantly different between subjects with and without CKD.
The genotype frequencies included in the analyses were in accordance with Hardy–Weinberg equilibrium (HWE), except for the following: apolipoprotein A5 gene (APOA5) G553T (Cys185Gly, rs2075291) (T allele = 0.066, χ2 = 4.791, P = 0.029), apolipoprotein E gene (APOE) T471C (Cys112Arg, rs429358) (C allele = 0.099, χ2 = 6.833, P = 0.009), APOE T − 219G (rs405509) (G allele = 0.307, χ2 = 8.666, P = 0.003), and the translocase of outer mitochondrial membrane 40 homolog gene (TOMM40) A/G (rs157580) (G allele = 0.473, χ2 = 6.626, P = 0.010). The genotype call rate was more than 99.6% for all individuals with serum creatinine (SCr) data (n = 3,326).
Polymorphisms involved in lipid metabolism and risk of CKD
The potential confounders tested did not fulfill the significance criteria of change in estimate (CIE) >0.1 (10%), so we adopted the odds ratios (ORs) adjusted only for age and sex. Logistic regression analysis revealed that APOA5 T − 1131C (rs662799), APOA5 T1259C (rs2266788), TOMM40 A/G (rs157580), and cholesterol ester transfer protein gene (CETP) TaqIB (rs708272) were significantly associated with the risk of CKD, with age- and sex-adjusted ORs (aORs) and 95% confidence intervals (95% CIs) of aOR 1.22 (95% CI: 1.06–1.39), 1.19 (1.03–1.37), 1.27 (1.12–1.45), and 0.81 (0.71–0.92), respectively (Table 2). Because the two APOA5 SNPs (rs662799 and rs2266788) are reported to be closely linked, we also conducted haplotype analysis for these loci. This confirmed that the two SNPs were tightly linked, with linkage disequilibrium (LD) coefficients D’ = 0.99, r2 = 0.72, while the C-C haplotype was found to be significantly associated with an increased risk of CKD (aOR 1.18 (95% CI: 1.02–1.36)) (Additional file 1: Table S1). We also conducted the analysis of serum lipid levels according to these genotypes found to be significant, as it may provide important information about the possible underlying mechanisms for the associations found (Additional file 2: Table S2).
To detect the lifestyle factors involved in gene–environment interactions with the genes significantly associated with CKD risk, we evaluated the interaction term for effect measure modification using the Breslow–Day (B–D) test of homogeneity with α = 0.05. Body mass index (BMI) was extracted as the only covariate that significantly contributed to the outcome prediction. Gene–environment interactions were then assessed by the logistic model incorporating a multiplicative interaction term, which revealed that BMI was a significant effect modifier for APOA5 T − 1131C (rs662799) and a marginally significant effect modifier of APOA5 T1259C (rs2266788). The interaction between high BMI (≥30) and individuals with at least one minor allele of each SNP was OR 10.43 (95% CI: 1.29–84.19) and 3.36 (0.87–13.01), respectively. Stratified analyses of the CKD risk for the APOA5 T − 1131C (rs662799) SNP by BMI resulted in a strikingly higher OR for individuals with at least one C allele of APOA5 T − 1131C (rs662799) when only those individuals with BMI ≥30 were included (OR 12.39 (95% CI: 1.55–99.09); Table 3). Additionally, we conducted an exhaustive investigation of the gene–environment interactions for all SNPs tested, which revealed several statistically significant interactions in addition to the one described above (Additional file 3: Table S3).
The present study examined the associations between polymorphisms in genes involved in lipid metabolism and the risk of CKD in the Japanese population, and identified a total of four SNPs (two in APOA5 (T − 1131C [rs662799] and T1259C [rs2266788]), TOMM40 A/G (rs157580), and CETP TaqIB (G > A) (rs708272)) that were significantly associated with CKD risk. While the functional implications of some of these polymorphisms are well-known, others have not yet been sufficiently clarified.
The APOA5 SNP T − 1131C (rs662799) is located in the APOA5 promoter region and is thought to modulate gene expression, with minor allele carriers found to have high triglyceride levels. It is also reported to be in strong LD with the APOA5 SNP rs2266788 [10, 11]. There exist a considerable number of reports supporting these effects of APOA5 SNPs on blood triglyceride levels [10, 12, 13], and given the potentially important roles of blood triglyceride concentrations in the development of human CKD [13, 14], the modulation of blood triglyceride levels due to these APOA5 SNPs may contribute to the genesis of CKD in humans. The result of our haplotype analysis of APOA5 SNPs (rs662799 and rs2266788) suggested the potentially substantial role of rs662779. As this rs662779 (T-1131C) SNP in APOA5 is located in the promoter region of the APOA5 gene, it is speculated to modulate the expression of APOA5, although further biological investigations will be required to confirm it.
TOMM40 is located within 15 kb of APOE, and this is reflected by the strong LD of TOMM40 polymorphisms, including SNP rs157580, with the ϵ4 allele. TOMM40 polymorphisms are therefore very interesting targets to study in association with human disorders such as Alzheimer’s disease . A recent genome-wide association study revealed that the TOMM40 SNP rs157580 was significantly associated with low triglyceride levels , although another study reported a significant association between the TOMM40 rs157580 minor (G) allele and increased levels of triglycerides in the Chinese population . Given that population-specific effects appear to exist between different ethnicities in East Asian countries for the same polymorphism , our present finding may provide valuable information for future genetic investigations and help prevent publication bias .
The CETP TaqI B polymorphism was previously shown to be associated with an effect on HDL cholesterol concentrations , as well as subsequent CVD risk , which is thought to result from LD between this SNP and an as yet unknown functional mutation in the regulatory region of CETP. The functional roles of this CETP SNP in the regulation of human blood cholesterol levels have been well established by a number of previous studies [23, 24]. Taking into considerations the important roles of blood cholesterol levels in the risk of renal dysfunction, this CETP SNP is considered to be involved in the CKD development through the modulation of blood cholesterol concentrations.
To date, only a few associations between SNPs in lipid metabolizing genes and CKD risk have been reported, with recent studies reporting a role for apolipoprotein L1 variants in the risk and progression of CKD in African American populations [25, 26], and associations of the apolipoprotein A1 gene (APOA1) and APOA5 with CKD risk. Associations between the four SNPs and CKD risk have not previously been reported, so this study provides novel evidence for the effect of genetic variations in these genes involved in lipid metabolism and CKD risk. Moreover, a previous significant association observed between APOE rs405509 and CKD risk was not replicated in the present study. The associations of some, but not all, of the SNPs in our study with CKD followed a similar trend to that previously reported for CVD [27, 28], which might be expected given that CKD is considered to be a form of CVD. The differences could reflect the existence of etiologies specific to each vascular disease, and different gene–environment or gene–gene interactions between races/ethnicities. Nevertheless, the present research appears to confirm the previously reported findings of the possible influence of lipid disorders on the risk of CKD in humans [3, 22].
SNPs shown to be marginally significant in the present study, liver X receptor-alpha gene (NRIH3) rs2167079, dedicator of cytokinesis 7 gene (DOCK7) rs1167998, and CETP rs70827, suggest a possible involvement of these genes in CKD development. NRIH3 inhibits cholesterol absorption, while CETP mediates the exchange of lipids between lipoproteins, resulting in the net transfer of cholesteryl ester from HDL cholesterol to other lipoproteins. Considering the important roles of these genes in lipid metabolism and subsequent CKD onset, the involvement of their functional polymorphisms in CKD risk seems biologically plausible. However, their marginal significance could have been detected as a result of a type I error, which necessitates further investigation with sufficiently larger sample sizes. The remaining SNPs found not to be associated with CKD risk may not play a major role in CKD development, thus discouraging us from their further investigation.
One of the most marked as well as important findings of the present study is the significant interaction between the APOA5 SNP and BMI on CKD risk, considering its possible future application in the personalized prevention of CKD. BMI can be regarded as a convenient proxy for energy intake and consumption, as demonstrated by the association between dietary fat and obesity , which was represented in a study of the interaction between a polymorphism in the nitric oxide synthase 3 (NOS3) gene and BMI on the risk of type 2 diabetes  and in other studies . APOA5 polymorphisms have previously been reported to be associated with elevated serum triglyceride levels by several studies [10, 12, 13], and an interaction between the APOA5 polymorphism and BMI on high serum triglyceride levels was reported in the East Asian population . Taking these findings into consideration, we speculate that the synergistic effect of obesity and dyslipidemia caused by APOA5 polymorphisms may confer the increased risk of CKD.
Our additional exhaustive investigations of the gene-environment interactions using all polymorphisms tested revealed several statistically significant associations. Although we didn’t take all these interactions into further considerations in the present study, these findings may suggest the way for our future investigations.
The present study has several potential limitations. Serum lipid levels, such as cholesterol and/or triglyceride, could be considered as covariates to be adjusted; however, they can also be regarded as causal intermediates that link the polymorphisms involved in lipid metabolism and CKD risk. Therefore, because adjusting for even a partially causal intermediate phenotype would incorrectly remove a true association and potentially bias the true association , we chose not to adjust for these variables in this study. Second, although the genotype frequencies of some of the SNPs investigated significantly deviated from HWE, the actual differences in the number of subjects for all genotypes compared with that expected from the equilibrium were small (up to 2.5%), or the deviation was caused by the relatively small frequency of the minor allele (<10%). Increasing the sample size may have resulted in more robust findings, but it was not easy to do this because of study design constraints. Third, we chose not to adopt the correction of multiple comparisons by Bonferroni procedures because this study was conducted under an exploratory context, and because such adjustments can be regarded as too conservative . Fourth, all CKD cases were diagnosed from SCr data, which potentially differ from the actual GFR based on renal measurements, so could have diluted the effect of each genotype on CKD risk. Finally, albuminuria was not detected in the present study. Further investigations with improved study designs are therefore required.
The present study found that two APOA5 polymorphisms (T − 1131C [rs662799] and T1259C [rs2266788]), as well as TOMM40 A/G (rs157580) and CETP TaqIB (G > A) (rs708272) were significantly associated with CKD risk in the Japanese population. A significant interaction between the APOA5 T − 1131C SNP and BMI on CKD risk was also demonstrated, indicating the future possibility of personalized risk estimation for this life-limiting disease.
Subjects were participants of the J-MICC Study, initially conducted in 10 areas of Japan, in which around 75,000 voluntarily enrolled participants aged 35–69 years provided blood samples, health check-up data, and lifestyle data through a questionnaire after providing their written informed consent .
In the present analysis, 4,519 randomly selected participants (about 500 subjects from each of the 10 areas) were analyzed for whom 108 selected polymorphisms had been genotyped . Of these individuals, six were excluded because of ineligibility or withdrawal from the study. SCr had been measured in 3,326 respondents from eight of the 10 areas of Japan. Of these, 58 were excluded because of genotyping failure, and the remaining 3,268 were included in the analyses. Informed consent was obtained from all subjects and the study protocol was approved by the Institutional Review Board (IRB) of Nagoya University Graduate School of Medicine (IRB approval no. 253-6) and the affiliated Medical Universities.
Evaluation of lifestyle exposure
Lifestyle exposures were evaluated by a self-administered questionnaire that was checked by trained staff. The questionnaire included items on smoking status, alcohol consumption, and medical history. Smoking status was classified as current, former, or never, and the level of exposure was evaluated in pack-years. Former smokers were defined as people who had quit smoking for at least 1 year. Alcohol consumption for each type of beverage was determined by average intake frequency and quantity, then converted into the Japanese sake unit gou (180 ml), which is equivalent to 23 g of ethanol. The participants were categorized into non-habitual drinkers, habitual drinkers who drank less than 1 gou per day, and those who drank at least 1 gou per day; the latter two groups were coded as indicator variables. Intakes of energy and macronutrients were estimated based on responses to a food frequency questionnaire (FFQ), for which its reproducibility and validity to estimate nutrient intakes had been tested and confirmed [33–36]. Correlation coefficients between the FFQ and 3-day food records were 0.49 for energy, 0.61 for % energy from fat, and 0.86 for % energy from carbohydrate in men. The corresponding figures in women were 0.44, 0.48, and 0.66, respectively .
eGFR and definitions of CKD
SCr was measured in all participants using an enzymatic method. The eGFR of each participant was calculated based on SCr, age, and sex using the following Japanese eGFR equation proposed by the Japanese Society of Nephrology : eGFR (ml/min/1.73 m2) = 194 × SCr (mg/dl)–1.094 × age–0.287 (×0.739 if female). The prevalence of CKD was determined for CKD stages 3–5 (defined as eGFR <60 ml/min/1.73 m2).
Selection of SNPs
We selected 28 candidate SNPs in 17 genes based on the notion that they are well characterized and reported to be associated with the risk of lipid metabolism disorders using public databases such as PubMed and Online Mendelian Inheritance in Man. The selected SNPs were as follows: APOA1 Ala61Thr (G219A) (rs12718465), APOA5 G553T (Cys185Gly) (rs2075291), APOA5 T − 1131C (rs662799), APOA5 C/A (rs6589567), APOA5 T1259C (rs2266788), apolipoprotein B gene (APOB) A/G (rs673548), APOE Arg158Cys (C609T) (rs7412), APOE Cys112Arg (T471C) (rs429358), APOE T − 219G (rs405509), APOE cluster A/G (rs4420638), TOMM40 A/G (rs157580), 3-hydroxy-3-methylglutaryl-CoA reductase gene (HMGCR) G/A (rs3846662), lipoprotein lipase gene (LPL) G/A (rs331), LPL G1791C (Ser474Stop) (rs328), NR1H3 G/A (rs7120118), NR1H3 A/G (rs2167079), melatonin receptor 1B gene (MTNR1B) A/G (rs1447352), fatty acid desaturase 2 gene (FADS2) C/T (rs174570), potassium channel, subfamily J, member 11 gene (KCNJ11) A1577G (Ile337Val) (rs5215), macoilin gene (TMEM57) A/G (rs10903129), DOCK7 A/C (rs1167998), cadherin gene (CELSR2) C/T (rs4970834), hepatic lipase gene (LIPC) Val95Met (G340A) (rs6078), LIPC T − 514C (rs1800588), CETP TaqIB (G > A) (rs708272), CETP G/T (rs3764261), CETP Ile405Val (G > A) (rs5882), and CETP A − 629C (rs1800775).
DNA was extracted from buffy coat using a BioRobot® M48 Workstation (QIAGEN, Tokyo, Japan), or from whole blood samples using an automatic nucleic acid isolation system (NA-3000, Kurabo Industries Ltd., Osaka, Japan). Genotyping was performed by the RIKEN institute (Wako, Japan) using the multiplex PCR-based invader assay (Third Wave Technologies, Madison, WI) as described previously .
Differences in the distribution of each characteristic variable between individuals with and without CKD were examined by the Student’s t-test or χ2 test. Accordance with HWE, indicating an absence of discrepancy between genotype and allele frequencies, was determined using the χ2 test. Logistic regression analysis was performed to estimate age- and sex-adjusted ORs and 95% CIs for CKD by genotype. All other potential confounding variables, including BMI, systolic blood pressure, diastolic blood pressure, fasting plasma glucose, glycated hemoglobin, total cholesterol, HDL cholesterol, triglycerides, uric acid, past history of cardiovascular or cerebrovascular diseases, use of anti-hypertensive, glucose-lowering, or lipid-lowering drugs, smoking status, and drinking habit were tested  to determine if they produced significant CIEs, as described previously [40, 41].
We next evaluated the interaction term for effect measure modification using the B–D test of homogeneity with α = 0.05 . Using the variables extracted by the process above, gene–environment interactions were assessed by the logistic model, which included a multiplicative interaction term as well as variables for genotypes, environment factors, age, and sex. Age adjustments in the analyses were performed with ages regarded as continuous variables. Analyses by genotype based on per allele model were carried out with genotypes for each polymorphism coded as ordinal–categorical variables according to the number of minor alleles. Differences of serum lipid levels by genotype were analyzed with Kruskal-Wallis test. All P values were two-sided, and all calculations were performed using Stata® version 10 software (StataCorp, College Station, TX).
We all agree that every author is the co-first author of the paper.
Chronic kidney disease
High-density lipoprotein cholesterol
Cholesteryl ester transfer protein
Translocase of the outer mitochondrial membrane 40
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We thank Kyota Ashikawa, Tomomi Aoi, and other members of the Core for Genomic Medicine, Center for Integrative Medical Sciences, RIKEN for support with genotyping in the study, Yoko Mitsuda, Keiko Shibata, and Etsuko Kimura at the Department of Preventive Medicine of Nagoya University Graduate School of Medicine, Miki Watanabe and Isao Oze at the Division of Epidemiology and Prevention of the Aichi Cancer Center Research Institute, Fusako Katsurada at the Department of Health Science of Shiga University of Medical Science, and Mitsuhiko Matsushita and Yasunobu Sagara at the Tokushima Prefecture Health Examination Center for their cooperation, technical assistance, and valuable comments. This study was supported in part by Grant-in-Aid for Scientific Research on Priority Areas of Cancer (No. 17015018) and on Innovative Areas (No. 221S0001) from the Ministry of Education, Culture, Sports, Science and Technology of Japan.
The authors declare that they have no competing interests.
AH did the data analysis and drafted the manuscript. KW, NH and HT designed and supervised the study. MK conducted the genotyping of the entire study subjects. MN, S. Suma, TS, SH, MH, TCT, S. Suzuki, TSK, HM, KO, IW and HU all contributed to the collection of data. All authors read and approved the final manuscript.
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Hishida, A., Wakai, K., Naito, M. et al. Polymorphisms of genes involved in lipid metabolism and risk of chronic kidney disease in Japanese - cross-sectional data from the J-MICC study. Lipids Health Dis 13, 162 (2014). https://doi.org/10.1186/1476-511X-13-162
- Lipid metabolism
- Chronic kidney disease
- Single nucleotide polymorphism