Abstract
Atrial fibrillation (AF) is the most common arrhythmia. In 2014, two new meta-GWAS identified 5 AF loci, including the NEURL locus, GJA1 locus, CAND2 locus, and TBX5 locus in the European ancestry populations and the NEURL locus and CUX2 locus in a Japanese population. The TBX5 locus for AF was reported by us in 2013 in the Chinese population. Here we assessed the association between AF and SNPs in the NEURL, GJA1, CAND2 and CUX2 loci in the Chinese Han population. We carried out a large case-control association study with 1,164 AF patients and 1,460 controls. Significant allelic and genotypic associations were identified between NEURL variant rs6584555 and GJA1 variant rs13216675 and AF. Significant genotypic association was found between CUX2 SNP rs6490029 and AF. No association was found between CAND2 variant rs4642101 and AF, which may be due to an insufficient power of the sample size for rs4642101. Together with our previous findings, seven of fifteen AF loci (<50%) identified by GWAS in the European ancestry populations conferred susceptibility to AF in the Chinese population, and explained approximately 14.5% of AF heritability. On the other hand, two AF loci identified in the Japanese population were both replicated in the Chinese population.
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Introduction
Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia with an incidence rate of 1–2% in the general population1,2. AF is characterized by fast and irregular abnormal atrial electrophysiological activities, which can lead to >15% of strokes, blood clots and heart failure and increases the rate of sudden death3,4,5. AF is caused by genetic factors, environmental factors and interactions among these factors6,7,8. The heritability of AF is 0.629. Mutations in ion channels such as KCNQ1 and Nav1.5 and non-ion channels such as NUP155 and ANF are rare, but can cause AF in isolated AF families10,11. On the other hand, genome-wide association studies (GWAS) have been effective in identification of common single nucleotide polymorphisms (SNPs) that increase risk of AF. Early series of GWAS and meta-GWAS in European ancestry populations identified 10 AF-susceptibility loci, including SNPs rs2200733 and rs10033464 near PITX2c gene, rs2106261 and rs7193343 in ZFHX3, rs13376333 in KCNN3, rs593479 in PRRX1, rs3807989 in CAV1, rs6479562 in C9orf3, rs10824026 in SYNPO2L, rs1152591 in SYNE2, rs7164883 located in HCN4 and rs2040862 in WNT8A12,13,14,15,16. In 2014, meta-GWAS in the European ancestry populations identified additional AF susceptibility variants, including NEURL SNPs rs12415501, CAND2 SNP rs4642101, GJA1 SNP rs13216675 and TBX5 SNP rs1050724817. Also in 2014, GWAS in a Japanese population identified two risk variants for AF, including NEURL SNP rs6584555 and CUX2 SNP rs649002917.
To date, no GWAS were reported for AF in the Chinese population despite the fact that there are over 10 million AF patients in China. Our group previously analyzed the potential association between AF and the 10 AF loci identified in the early series of GWAS and meta-GWAS in the European ancestry populations. We found that three of them, including the PITX2c, ZFHX3 and CAV1 loci, showed significant association with AF in the Chinese Han population, but other loci were not replicated in the Chinese Han population18,19,20. For the TBX5 locus, we reported in 2013 that a genomic variant in TBX5, rs3825214, showed a significant association with AF in the Chinese population21. In this study, we assessed association between AF with other meta-GWAS SNPs identified in European ancestry populations and the Japanese population, including SNP rs6584555 in NEURL, rs13216675 near GJA1, rs4642101 in CAND2 and rs6490029 in CUX2, in the Chinese GeneID population. We identified significant allelic and genotypic association between NEURL rs6584555 and GJA1 SNP rs13216675 and AF, significant genotypic association between CUX2 SNP rs6490029 and AF, but no association between CAND2 SNP rs4642101 and AF.
Results
Significant allelic association between GJA1 SNP rs13216675 and NEURL SNP rs6584555 and AF
We carried out a case control association study for AF with four SNPs, including SNP rs4642101 within the CAND2 gene on chromosome 3p25.2, rs13216675 close to the GJA1 gene on chromosome 6q22.3, rs6584555 near the NEURL gene on chromosome 10q24.33 and rs6490029 within the CUX2 gene on chromosome 12q24.11. Our study population included 1,164 AF patients and 1,460 non-AF controls from the Chinese Han GeneID population. The average age of the case group was 2.6 years younger than the control group (61.27 ± 11.33 vs. 63.8 ± 13.54, P < 0.01). The other characteristics of the case group and the control group are summarized in Table 1. In the control population, the genotypic frequencies for all four SNPs did not deviate from the Hardy-Weinberg equilibrium (P > 0.01). The minor allele frequency (MAF) of each SNP in our control population is similar to the data for the Chinese Han population from the HapMap database (Table 2).
The GJA1 SNP rs13216675 showed significant association with AF (observed P obs = 3.9 × 10−3, OR = 1.2) (Table 2). After adjusting for covariates of age, gender, hypertension (HTN), diabetes mellitus (DM) and coronary artery disease (CAD), the association remained significant (P adj = 0.01, OR = 1.19) (Table 2). The common allele T of SNP rs13216675 is the risk allele in the Chinese Han population (Table 2). The significant association between SNP rs13216675 and AF remained after adjusting for multiple testing with Bonferroni correction (corrected P = 0.04) (Table 2).
The NEURL SNP rs6584555 showed significant association with AF (P obs = 5.08 × 10−5, OR = 1.38) (Table 2). After adjusting for covariates of age, gender, HTN, DM and CAD, the association remained significant (P adj = 9.06 × 10−5, OR = 1.39) (Table 2). The minor allele C of SNP rs6584555 is the risk allele in the Chinese Han population (Table 2). The significant association between SNP rs6584555 and AF remained after adjusting for multiple testing with Bonferroni correction (corrected P = 3.62 × 10−4) (Table 2).
The two remaining SNPs, CAND2 SNP rs4642101 and CUX2 SNP rs6490029 did not show significant allelic association with AF in the Chinese Han population before or after adjustment for covariates (P obs and P adj > 0.05) (Table 2).
Significant genotypic association between NEURL SNP rs6584555, GJA1 rs13216675 and CUX2 SNP rs6490029 and AF
We also performed the case control association analysis for genotypic frequencies, which may pinpoint potential genetic models under which a significant association is found for a genetic variant in contrast to allelic association analysis. We analyzed the genotypic association for each SNP under three common genetic models: an additive model, a dominant model, or a recessive model. The results are summarized in Table 3.
Significant genotypic association was identified between NEURL SNP rs6584555 and AF under all three models, although most significant associations were obtained under the dominant and recessive models before and after adjusting for covariates of age, gender, HTN, DM and CAD (P obs = 4.03 × 10−4, P adj = 4.85 × 10−5 under an additive model; P obs = 4.38 × 10−4, P adj = 4.26 × 10−4 under a dominant model; P obs = 5.3 × 10−3, P adj = 1.51 × 10−3 under a recessive model) (Table 3). The significant genotypic association between SNP rs6584555 and AF remained after adjusting for multiple testing with Bonferroni correction (corrected P < 0.05) (Table 3).
For CUX2 SNP rs64990029, although no significant allelic association was found for AF, significant genotypic association was identified for AF under both the additive and the dominant models, but not under the recessive model (P obs = 7.97 × 10−3 under a dominant model; P obs = 0.02 under an additive model) (Table 3). The significant genotypic association between SNP rs64990029 and AF remained under the dominant model and after adjusting for covariates of age, gender, HTN, DM and CAD (P adj = 8.28 × 10−3) and after further adjusting for multiple testing with Bonferroni correction (corrected P = 0.04) (Table 3).
For GJA1 SNP rs13216675, significant genotypic association was identified for AF under an additive model and a dominant model, but not under a recessive model (P obs = 6.72 × 10−3, P adj = 0.01 under an additive model; P obs = 2.28 × 10−3, P adj = 3.04 × 10−3 under a dominant model; P obs = 0.07, P adj = 0.14 under a recessive model) (Table 3). The significant genotypic association between SNP rs13216675 and AF remained after adjusting for multiple testing with Bonferroni correction (P < 0.05) (Table 3).
For CAND2 SNP rs4642101, similar to the data from allelic association analysis, we did not find any significant genotypic association with AF in the Chinese Han population.
Estimation of AF heritability explained by SNPs significantly associated with AF in the Chinese population
For the three SNPs showing significant association with AF in the Chinese Han population (GJA1 SNP rs13216675, NEURL SNP rs6584555 and CUX2 SNP rs6490029), we estimated the heritability of AF explained by each of them. As shown in Table 4, GJA1 SNP rs13216675, NEURL SNP rs6584555 and CUX2 SNP rs6490029 explained 1.8%, 3.7% and 2.6% of AF heritability, respectively. Together, these three variants explained approximately 8.1% of AF heritability. Previously, we reported three other SNPs which also showed significant association with AF in the Chinese Han population, including SNP rs2200733 on 4q25 and near PITX2, rs2106261 on ZFHX3 locus and rs3807989 on CAV118,19,20. SNP rs2200733, rs2106261 and rs3807989 explained about 6.4% of AF heritability (1.8% for rs2200733, 1.7% for rs2106261 and 2.9% for rs3807989). Together, these six SNPs explained 14.5% of AF heritability.
Discussion
In this study, we analyzed four genomic variants associated with AF in either the European ancestry populations or the Japanese population for their association with AF in the Chinese Han population. These variants include NEURL SNP rs6584555, GJA1 SNP rs13216675, CUX2 SNP rs6490029 and CAND2 SNP rs4642101. Our study population consisted of 1,164 AF patients and 1,460 non-AF controls. Three of the four loci, the NEURL locus, GJA1 locus and CUX2 locus, were successfully replicated in the Chinese population (Tables 2 and 3). The CAND2 locus was not replicated in the Chinese population (Tables 2 and 3), which may be due to an insufficient power of the sample size for this variant.
The 2014 meta-GWAS in the European ancestry populations reported four loci for AF, including NEURL (rs12415501), GJA1 (rs13216675), TBX5 (rs10507248) and CAND2 (rs4642101). The TBX5 locus was reported in 2013 by us by studying a Chinese AF population21 before the GWAS report. For the three remaining loci, the NEURL and GJA1 loci were significantly associated with AF in the Chinese population, whereas the CAND2 locus did not show any significant association with AF (Tables 2 and 3). Previously, we showed that only three of the 10 AF GWAS loci identified in the European ancestry populations before 2014 were significantly associated with AF in the Chinese populations18,19,20. Interestingly, the two AF loci reported in the 2014 GWAS in a Japanese population, namely NEURL SNP rs6584555 and CUX2 SNP rs6490029, were both replicated in the Chinese population (Tables 2 and 3). This may be related to the fact that the evolution distance between the Japanese population and the Chinese population is closer that that between the European ancestry populations and the Chinese population.
Our study has a limitation. Our study population of 1,164 AF patients and 1,460 non-AF controls has a sufficient power of 97% and 91% for genomic variants rs6584555 in NEURL and rs6490029 in CUX2, respectively. However, its power for rs13216675 near GJA1 and rs4642101 in CAND2 was 0.40 and 0.39, respectively. Therefore, lack of association between rs4642101 in CAND2 and AF may be due to the small sample size. Future studies with larger AF case control populations may be needed to further clarify the association between rs4642101 in CAND2 and AF in the Chinese Han population.
In conclusion, we found significant associations between AF and NEURL SNP rs6584555, GJA1 SNP rs13216675 and CUX2 SNP rs6490029, but not CAND2 SNP rs4642101. Together with our earlier reports, we show that among the 15 GWAS loci for AF reported in the European ancestry populations and Japanese population, seven loci (PITX2c, ZFHX3, CAV1, NEURL, GJA1, TBX5 and CUX2 loci) also confer a significant risk of AF in the Chinese Han population. Our findings provide an important understanding of the detailed genomic landscape for AF susceptibility in the Chinese Han population. Our data also suggest that although the European ancestry populations share some common susceptibility loci for AF with the Chinese population, different populations may contain their own unique susceptibility loci for AF.
Materials and Methods
Study subjects
The study subjects for this study were from the large GeneID database, which has over 80,000 study subjects with cardiovascular diseases in the Chinese Han population22,23,24,25,26,27. To minimize stratification of population heterogeneity, only study subjects of Han ethnic origin (by self-description) were included. A total of 2,624 subjects were enrolled into this study, including the case group with 1,164 AF patients and the control group with 1,460 non-AF individuals. AF was diagnosed by at least two expert cardiologists based on the criteria of the ACC/AHA/ESC AF guidelines28. The control group includes study subjects without AF based on their ECG data and clinical history. The exclusion criteria for both cases and controls include other types of cardiac arrhythmias, ischemic stroke, valvulopathies, structural heart defects, cardiomyopathies and a left ventricular ejection fraction of <50% by electrocardiograms (ECGs), echocardiography, magnetic resonance imaging (MRI) and computed tomography (CT)19,29.
This study was approved by the ethics committee on human subject research at Huazhong University of Science and Technology and other appropriate local ethics committees on human subject research. This study is conformed to the guidelines set forth by the Declaration of Helsinki. Written informed consent was obtained from the participants.
SNP genotyping
Human genomic DNA was extracted from peripheral blood samples using the Wizard Genomic DNA Purification Kit as described previously by us30.
Each SNP was genotyped using a Rotor-Gene 6000 High Resolution Melt system as described by us previously31,32. The HRM technology is based on the different molecular physical properties of DNA molecules on the fragment length, GC content and GC distribution, which makes DNA molecules with different genotypes (two different homozygotes and the heterozygote) have different shapes and positions of its dissolution curves when heated at different temperatures. The three different genotypes for a genomic variant can then be distinguished based on their different dissolution curves. The polymerase chain reactions (PCR) for genotyping was performed in a 25 μl mixture with 2.5 μl of 10 × PCR buffer, 10 mM dNTP (0.5 μl), 25 mM Mg2+ (1.5 μl), 5 pmol of each primer, 25 ng of genomic DNA and 0.7 μl of 5 mM SYTO9. PCR was performed on an ABI9700 System (Applied Biosystems, Foster City, CA) with a thermal profile of 95 °C for 5 minutes, 40 cycles of 95 °C for 15 seconds, 60.3 °C or other appropriate annealing temperatures for 15 seconds and 72 °C for 20 seconds and 72 °C for 10 minutes. Primers for PCR are listed in Table 5. PCR products were directly genotyped using the high resolution melting (HRM) analysis on a Rotor-Gene 6000 System (Corbett Life Science, Australia). DNA samples from 100 study subjects were randomly selected for each SNP for direct Sanger sequencing analysis and the sequencing data completely matched the HRM genotyping data.
Statistical analysis
We used PLINK version 1.07 to perform the Hardy–Weinberg linkage equilibrium test in the control group as described by us previously18,27,33,34,35. Pearson 2 × 2 and 2 × 3 contingency table χ2 tests were performed with SPSS (version 17.0; SPSS, Inc., Chicago, IL) to analyze allelic association and genotypic association, respectively and to compute odds ratios (ORs) and corresponding 95% confidential intervals (CIs). Multiple logistic regression analysis was used to adjust significant covariates of age, gender, hypertension (HTN), coronary artery disease (CAD) and diabetes mellitus (DM) for AF using SPSS (version 17.0; SPSS, Inc., Chicago, IL).
We estimated the heritability of AF explained by each significant SNP using the multifactorial liability threshold model based on OR estimates using the R package as described previously36. The computation of heritability was based on the frequency of the risk allele, relative risk of one risk allele (Aa) over that of no risk allele (aa) (OR: Aa/aa), relative risk of two risk alleles (AA) over that of no risk allele (aa) (OR:AA/aa) and the overall prevalence rate of AF in the population. We assumed a disease prevalence estimate of 0.73% for AF in the Chinese population.
Statistical power analysis of the study population was conducted using program PS (Power and Sample size Calculations, version 3.0.43)37. For power analysis, we utilized the reported OR values in the European ancestry populations (GJA1 SNP rs1321667 and CAND2 SNP rs4642101) or the Japanese population (NEURL SNP rs6584555 and CUX2 SNP rs6490029)16,17, the minor allele frequencies for the studied variants in the Chinese population from the HapMap database and a type I error of 0.05.
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Acknowledgements
We thank the study subjects for their participation and support of this study and all members of the GeneID team for help and assistance. This study was supported by the China National Natural Science Foundation grants (31430047, 81630002, 81600263 and 91439129), 2016 Top-Notch Innovative Talent Development Project from the Bureau of Human Resources and Social Security of Wuhan City, the Chinese National Basic Research Program (973 Project 2013CB531101), NIH/NHLBI grants R01 HL121358 and R01 HL126729, Hubei Province Natural Science Programs (2016CFB224 and 2014CFA074), and the Hubei Province’s Outstanding Medical Academic Leader Program.
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Design of the study: Q.C., C.X. and Q.K.W. Experiments and data analysis: P.X.W., W.Q., P.Y.W., Y.H., Y.L., R.Z., S.L., Q.Y., X.W., F.C., J.L., B.Y., X.C., Y.L., Y.W., T.K., X.T., X.R., Y.Y., Y.X., X.L., M.L., J.L., Y.X., Q.C., C.X. and Q.K.W. Drafting of the manuscript: P.X.W. and C.X. Critical revision of the manuscript: H.L., C.X., Q.C. and Q.K.W. Study supervision: Q.K.W.
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Wang, P., Qin, W., Wang, P. et al. Genomic Variants in NEURL, GJA1 and CUX2 Significantly Increase Genetic Susceptibility to Atrial Fibrillation. Sci Rep 8, 3297 (2018). https://doi.org/10.1038/s41598-018-21611-7
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DOI: https://doi.org/10.1038/s41598-018-21611-7
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