Abstract
Epidemiological studies demonstrate an association between migraine and chronic kidney disease (CKD), while the genetic basis underlying the phenotypic association has not been investigated. We aimed to help avoid unnecessary interventions in individuals with migraine through the investigation of phenotypic and genetic relationships underlying migraine, CKD, and kidney function. We first evaluated phenotypic associations using observational data from UK Biobank (N = 255,896). We then investigated genetic relationships leveraging genomic data in European ancestry for migraine (Ncase/Ncontrol = 48,975/540,381), CKD (Ncase/Ncontrol = 41,395/439,303), and two traits of kidney function (estimated glomerular filtration rate [eGFR, N = 567,460] and urinary albumin-to-creatinine ratio [UACR, N = 547,361]). Observational analyses suggested no significant association of migraine with the risk of CKD (HR = 1.13, 95% CI = 0.85–1.50). While we did not find any global genetic correlation in general, we identified four specific genomic regions showing significant for migraine with eGFR. Cross-trait meta-analysis identified one candidate causal variant (rs1047891) underlying migraine, CKD, and kidney function. Transcriptome-wide association study detected 28 shared expression–trait associations between migraine and kidney function. Mendelian randomization analysis suggested no causal effect of migraine on CKD (OR = 1.03, 95% CI = 0.98–1.09; P = 0.28). Despite a putative causal effect of migraine on an increased level of UACR (log-scale-beta = 0.02, 95% CI = 0.01–0.04; P = 1.92 × 10−3), it attenuated to null when accounting for both correlated and uncorrelated pleiotropy. Our work does not find evidence supporting a causal association between migraine and CKD. However, our study highlights significant biological pleiotropy between migraine and kidney function. The value of a migraine prophylactic treatment for reducing future CKD in people with migraine is likely limited.
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Introduction
The vascular dysfunction basis of migraine, a common neurological disorder, is well established (Gormley et al. 2016; Hautakangas et al. 2022). Accumulating evidence from observational studies has demonstrated a long-term risk of macrovascular complications among individuals with migraine, including a 30% significantly increased risk of stroke and a 36% significantly increased risk of myocardial infarction compared to the general population according to results from the most updated meta-analysis (Ng et al. 2022). Such a link, however, stays weak for microvascular complications with most evidence restricted to retinal abnormalities (Al-Moujahed et al. 2021; Lin et al. 2021). Despite studies having identified an association of migraine with endothelial dysfunction (Tietjen 2009), which might lead to abnormal kidney function (Chauhan et al. 2019), only one nationwide population-based cohort study reports individuals with migraine to be at a 22% increased risk of chronic kidney disease (CKD) compared to individuals without migraine, independent of migraine medications (Weng et al. 2017).
The brain–kidney interconnection has long been identified, as both display similar anatomical and functional microvascular regulations, and are regarded as end organs on parallel trajectories. Both also share cardiometabolic risk factors, with inflammation- and oxidative stress- induced microvascular dysfunctions usually starting in low-resistance vascular beds and endothelial structures (Murray 2009; Seliger and Longstreth 2008). Current progresses from genomic and proteomic studies have highlighted common pathogenic mechanisms underlying migraine and CKD involving vascular development and endothelial function (Carlsson et al. 2017; Gormley et al. 2016; Guo et al. 2020), and loci mapping to genes CPS1 (Choquet et al. 2021; Wuttke et al. 2019) and SMG6 (Hautakangas et al. 2022; Wuttke et al. 2019) are found to affect both migraine and kidney function. All these results suggest the observed phenotypic association be, at least in part, attributable to shared genetic basis.
Investigating the genetic contributions to the epidemiological associations helps to elucidate intrinsic biological mechanisms underlying migraine and CKD, which may aid clinical and public health practice, for example, to help doctors cut rates of unnecessary interventions for individuals with migraine. A genome-wide cross-trait analysis is an efficient approach to understand the intrinsic relationship across complex traits (Zhu et al. 2021). Such analysis leverages summary statistics from genome-wide association studies (GWAS) and cutting-edge statistical methods, including a genetic correlation analysis to quantify global and local genetic overlap, a cross-trait meta-analysis to identify specific shared variants, a transcriptome-wide association study to detect tissue-specific shared genes, and a Mendelian randomization analysis to make causal inference. To the best of our knowledge, no such study has been performed to systematically investigate the shared etiology underlying migraine and CKD.
Therefore, we aim to comprehensively dissect the migraine–CKD relationship, leveraging the hitherto largest observational and genetic data. We first evaluated the phenotypic association using individual-level data from 255,896 participants of UK Biobank (UKB). We next conducted a genome-wide cross-trait analysis to characterize the shared genetic architecture and causality. In addition to the binary diagnostic outcome, we further incorporated two continuous measures on kidney function. The overarching goal of our study was to gain insight into mechanistic links underpinning migraine and CKD. The overall study design is shown in Fig. 1.
Methods
Data sources
UK Biobank data
UKB is a large population-based prospective cohort study with over 500,000 individuals aged 40–69 years at baseline, recruited in 22 study assessment centers throughout UK between 2006 and 2010 (Sudlow et al. 2015). All participants provided written informed consent, and ethical approval was granted by the National Health Service North West Multi-Centre Research Ethics Committee. We restricted the sample set to 472,050 participants of white descent (data-field 21,000). We defined migraine as self-reported medical conditions code 1265 at baseline (data-field 20,002), the International Classification of Diseases, Ninth Revision (ICD-9) code 346 (data-field 41,271) and ICD-10 code G43 (data-field 41,270), and CKD as ICD-10 code N18. We excluded participants with a diagnosis of other headaches at baseline (self-reported medical conditions code 1436; ICD-10 code G44) or a history of kidney disease at baseline (ICD-9 codes 580–589; ICD-10 codes N00-N29) or reduced estimated glomerular filtration rate (eGFR < 90 mL/min per 1.73 m2) at baseline or had a diagnosis of CKD before migraine during follow-up. In total, 255,896 participants were included.
GWAS summary statistics for migraine and CKD
The hitherto largest GWAS of migraine was conducted by the International Headache Genetics Consortium (IHGC), aggregating five study collections (IHGC, 23andMe, UK Biobank, GeneRISK, Nord-Trøndelag Health Study) totaling ~ 870,000 individuals of European ancestry (102,084 cases and 771,257 controls) (Hautakangas et al. 2022). Migraine in IHGC was ascertained based on clinical phenotyping, while migraine in other studies was verified on self-report. An inverse-variance weighted fixed-effect meta-analysis was performed to combine effect sizes for each variant across studies, adjusted for sex and at least four leading principal components of the genetic population structure. We extracted the information of 123 genome-wide significant (P < 5 × 10–8) independent SNPs and used these SNPs as IVs (Supplementary Tables 1, 2 and 3). We also applied and obtained GWAS summary statistics (48,975 cases and 540,381 controls, excluding 23andMe) for other analyses.
Given the heterogeneity of migraine subtypes, to better reflect the subtype specificity of migraine and to improve the robustness of findings, additional 4 independent SNPs associated with migraine with aura (MA) and 15 independent SNPs associated with migraine without aura (MO) were used as IVs (Hautakangas et al. 2022).
The hitherto largest GWAS of CKD was conducted by the CKD Genetics (CKDGen) Consortium, aggregating 23 participating studies totaling ~ 480,000 individuals of European ancestry (41,395 cases and 439,303 controls) (Wuttke et al. 2019). CKD was defined as an eGFR below 60 ml/min per 1.73 m2. An inverse-variance weighted fixed-effect meta-analysis was conducted to combine effect sizes for each variant across studies. As CKD-associated SNPs were not reported by the original GWAS, we thus identified 27 genome-wide significant independent SNPs using PLINK clumping function (parameters: clump-p1 = 5e−8, clump-p2 = 1e−5, clump-r2 = 0.1, clump-kb = 500, pop = “EUR”) (Hemani et al. 2018).
While CKD represents the disease status, to better reflect different stages of CKD, we also included two critical measures of kidney function, eGFR (Wuttke et al. 2019) and urinary albumin-to-creatinine ratio (UACR) (Teumer et al. 2019). The hitherto largest GWAS of eGFR and UACR were conducted by the CKDGen Consortium, aggregating 42 participating studies totaling 567,460 individuals for eGFR and 18 participating studies totaling 547,361 individuals for UACR. An inverse-variance weighted fixed-effect meta-analysis was conducted to combine effect sizes in log (eGFR) and log (UACR) for each variant across studies, adjusted for sex and age. A total of 256 independent eGFR-associated SNPs and 61 independent UACR-associated SNPs were identified and used as IVs. We extracted the effect size and relevant information of these IVs (Supplementary Tables 4, 5 and 6), as well as downloaded full set GWAS summary statistics for other analyses.
Statistical analysis
Observational analysis
Baseline characteristics of UKB participants were presented as mean ± standard deviation (SD) for continuous variables, and as counts and percentages for categorical variables. Person-years at risk for the migraine-free category (unexposed) were accumulated from baseline until migraine diagnosis, CKD diagnosis, death, loss to follow-up, or end of follow-up, whichever came first. For the migraine category (exposed), person-years at risk were accumulated from baseline or migraine diagnosis during follow-up until CKD diagnosis, death, loss to follow-up, or end of follow-up, whichever came first. We constructed a Cox proportional hazards regression model with exposure to migraine modeled as a time-dependent variable. We used three sets of adjustments. Estimates in model 1 (basic model) were adjusted only for sex and age. Estimates in model 2 (antimigraine use model) were further adjusted for antimigraine medication usage (Anatomical Therapeutic Chemical classification code N02C; data-field 20,003), in addition to sex and age. Estimates in model 3 (full model) were further adjusted for assessment center, income, Townsend deprivation index, smoking, drinking, physical activity, sleep duration, BMI, type 2 diabetes mellitus, hypertension, and dyslipidemia on top of model 2. In the sensitivity analysis, we excluded participants with less than a year of follow-up or a diagnosis of CKD within a year after developing migraine. All statistical analyses were done using SAS version 9.4 (SAS Institute, Cary, NC). A two-sided P value of less than 0.05 was considered statistically significant.
Genome-wide genetic correlation analysis
Genetic correlation represents an average sharing of genetic effect between two traits that is independent of environmental confounders. We first quantified the global genetic correlation (rg) across the genome using software linkage-disequilibrium score regression (LDSC) (Bulik-Sullivan et al. 2015). The method uses only GWAS summary statistics, relying on the fact that the effect size estimate for a given SNP aggregates the effects of all SNPs in LD with that SNP. Genetic correlation ranges between − 1 and + 1. We used pre-calculated HapMap3 LD scores computed from ~ 1.2 million common SNPs in European ancestry, commonly acknowledged as well imputed. A Bonferroni-corrected P-threshold (P < 0.017 = 0.05/3) was used to define statistical significance.
While global genetic correlation depicts an average of shared signal across the whole genome, it may fail to identify scenarios where the signal is restricted to particular genomic regions or in opposing directions at different loci. We thus estimated the pairwise local genetic correlation using software SUPERGNOVA (Zhang et al. 2021). This algorithm partitions the whole genome into 2353 approximate LD-independent regions with an average length of 1.6 centimorgans and quantifies genetic correlation confined to these genomic regions. A Bonferroni-corrected P-threshold (P < 2.12 × 10–5 = 0.05/2,353) was used to define statistical significance.
Cross-trait meta-analysis
Genetic correlation reflects either horizontal pleiotropy (pleiotropy) or vertical pleiotropy (causality). In horizontal pleiotropy, a genetic variant has independent effects on multiple traits, whereas in vertical pleiotropy, a genetic variant has an effect on a trait through its genetic effect on an intermediate trait. We next conducted a cross-trait meta-analysis to identify pleiotropic variants that simultaneously influence both traits using software Cross-Phenotype Association (CPASSOC) (Zhu et al. 2015). CPASSOC combines GWAS summary statistics to test the association of each SNP with at least two traits, controlling for population structure or cryptic relatedness. We calculated pairwise SHet based on a fixed-effect model, a test statistic that is more powerful when heterogeneity (including opposite directional allelic effects) exists.
After CPASSOC, we obtained independent shared variants via PLINK clumping (parameters: –clump-p1 5e−8 –clump-p2 1e−5 –clump-r2 0.2 –clump-kb 500). Significant index SNP was defined as PCPASSOC < 5 × 10–8 and Pmigraine or CKD or kidney function < 1 × 10–5. Novel index SNP was defined only if all following three criteria were met: (1) the SNP reached genome-wide significance (PCPASSOC < 5 × 10–8) in CPASSOC; (2) the SNP did not reach genome-wide significance (5 × 10–8 < Pmigraine or CKD or kidney function < 1 × 10–5) in original single-trait GWAS; (3) the SNP was not in LD (\({r}^{2}\) < 0.05) with any of those previously reported genome-wide significant SNPs from both single-trait GWAS.
Ensembl Variant Effect Predictor (VEP, https://grch37.ensembl.org/info/docs/tools/vep/index.html) was used to map the shared SNPs identified by CPASSOC to its nearest gene.
Fine-mapping credible set analysis and colocalization analysis
An index SNP does not represent a causal SNP. We further identified a credible set of variants with a 99% probability of containing the causal variant at each of the identified pleiotropic loci using FM-summary (Huang et al. 2017). Specifically, we extracted variants within 500 kb of the index SNP at each locus and estimated posterior inclusion probability (PIP, the probability of including a SNP as causal) for each variant by setting a flat prior with the steepest descent approximation. A 99% credible set corresponds to ranking SNPs from largest to smallest PIPs and taking the cumulative sum of PIPs until it is at least 99%.
We also conducted Coloc (Giambartolomei et al. 2014) to examine whether cross-trait meta-analysis identified shared loci colocalized at the same causal variant. Coloc is a Bayesian algorithm calculating the posterior probabilities of different causal variant configurations under the hypothesis of a single causal variant at each locus for each trait, i.e., H0 (no causal variant), H1 (causal variant for trait 1 only), H2 (causal variant for trait 2 only), H3 (two different causal variants), and H4 (a common causal variant). A shared locus was considered colocalized if the posterior probability for H4 (PPH4) was greater than 0.7.
Transcriptome-wide association study analysis
Cross-trait meta-analysis identifies pleiotropic variants without considering gene expression and tissue specificity while many genetic variants lead to complex traits via regulating tissue-specific gene expressions. We performed a transcriptome-wide association study (TWAS) analysis using FUSION (Gusev et al. 2016) to identify regulated genes whose expression pattern across tissues implicates shared biological mechanisms. We first conducted single-trait TWAS using the expression weights from 48 post-mortem Genotype–Tissue Expression project (GTEx) tissues and CommonMind Consortium (CMC) brain tissue. The Bonferroni correction (PBonferroni < 0.05) within each tissue was used to identify significant expression–trait associations. We then performed joint/conditional tests for loci with multiple associated features to determine independent genes at each locus. Colocalization analysis was further conducted to examine whether GWAS signals and GTEx expression quantitative trait loci (eQTL) signals were colocalized at the same causal variant. We then integrated these results across traits to identify shared gene–tissue pairs.
Mendelian randomization analysis
We finally performed a bidirectional two-sample Mendelian randomization (MR) analysis to assess putative causal relationships via software TwoSampleMR (Hemani et al. 2018). We applied the inverse-variance weighted (IVW) method (Burgess et al. 2015) as our primary analytical method assuming all IVs to be valid, which provided the greatest statistical power. We next performed sensitivity analyses using MR-Egger regression (Bowden et al. 2015) and weighted-median method (Bowden et al. 2016) to examine the robustness of primary results. We also repeated IVW excluding palindromic IVs (i.e., A/T or G/C alleles) or pleiotropic IVs (SNPs associated with potential confounding traits according to NHGRI-EBI GWAS Catalog, https://www.ebi.ac.uk/gwas/). We further conducted CAUSE (Causal Analysis Using Summary Effect estimates) as a complementary analysis to detect causal relationships while accounting for both correlated and uncorrelated pleiotropic effects (Morrison et al. 2020). We then performed multivariable MR to account for the effect of blood pressure (Evangelou et al. 2018), as a shared causal factor for migraine and CKD (Guo et al. 2020; Zheng et al. 2022).
We computed the phenotypic variance explained by IVs (\({r}^{2}\)) (Shim et al. 2015) and calculated F-statistics (Pierce et al. 2011) to assess the strength of IVs (Supplementary Table 7). We also computed the statistical power of MR (https://shiny.cnsgenomics.com/mRnd/).
Results
Phenotypic association
The baseline characteristics of UKB participants included in the observational analysis are presented in Supplementary Table 8. Participants were followed for 3,122,499 person-years (12.1 ± 2.0 years), during which 97 migraine patients and 2,461 migraine-free individuals developed CKD (Table 1). After adjusting for sex and age, migraine patients showed a significantly increased hazard of CKD (HR = 1.32, 95% CI = 1.07–1.61). With further adjustment of antimigraine medication usage, the effect attenuated to some extent (10.33%), but remained statistically significant (HR = 1.28, 95% CI = 1.02–1.60). In fully adjusted model, the effect attenuated to null (HR = 1.13, 95% CI = 0.85–1.50). No significant association (HR = 1.05, 95% CI = 0.78–1.40) was observed in sensitivity analysis.
Global and local genetic correlation
As shown in Fig. 2A, no significant global genetic correlation between migraine and CKD (\({r}_{g}\) = − 0.01, P = 0.84) was found. For kidney function, no significant global genetic correlation was observed for migraine with either eGFR (\({r}_{g}\) = − 0.01, P = 0.75) or UACR (\({r}_{g}\) = 0.01, P = 0.82).
Genome-wide genetic correlation between migraine and chronic kidney disease. The boxes (A) denote point estimates of the global genetic correlation, and the error bars denote 95% confidence intervals (CI). The blue color indicates a positive genetic corralation and the green color indicates a negative genetic corralation. In the QQ plots (B–D) and Manhattan plots (E–G), each point presents a specific genomic region, while red points represent genomic regions that contribute significant local genetic correlation as estimated by SUPERGNOVA (P < 0.05/2353). CKD, chronic kidney disease; eGFR, estimated glomerular filtration rate; UACR, urinary albumin-to-creatinine ratio
Partitioning the whole genome into 2353 LD-independent regions and after correcting for multiple testing (P < 2.12 × 10–5), no significant local signal was identified between migraine and CKD (Fig. 2B–G and Supplementary Table 9). For kidney function, significant local signal was observed for migraine with eGFR at four genomic regions (4q24, 9q34.1, 11q14.1, 12q24.1). Of note, 4q24 (chromosome 4: 103,388,441–104,802,530), with the strongest local effect, harbors gene NFKB1 encoding the subunits of nuclear factor‑κB (NF‑κB) transcription factor, known to associate with migraine (Reuter et al. 2002), kidney function, and CKD (O'Brown et al. 2015).
Cross-trait meta-analysis
Given the evidence of significant local genetic overlap, we further performed pairwise CPASSOC to identify pleiotropic loci (Table 2 and Supplementary Table 10). In total, 11 independent pleiotropic SNPs reached genome-wide significance (PCPASSOC < 5 × 10–8) in cross-traits and suggestive significance (Pmigraine/CKD/kidney function < 1 × 10–5) in single traits, including one locus shared between migraine and CKD (rs1047891), seven loci shared between migraine and eGFR (rs1566225, rs41272663, rs1047891, rs13099628, rs6776700, rs62576116, rs9894634), and three loci shared between migraine and UACR (rs1047891, rs1971819, rs4909945). Of note, rs1047891 was shared across all traits. This SNP is located near CPS1, previously reported to associate with migraine in women (Choquet et al. 2021) and eGFR (Kottgen et al. 2010).
After excluding SNPs that reached genome-wide significance in single traits (Pmigraine/CKD/kidney function < 5 × 10–8) or were in LD (\({r}^{2}\) ≥ 0.05) with any of the previously reported genome-wide significant SNPs (Supplementary Table 11), two novel SNPs (rs41272663, rs13099628) were identified to be shared between migraine and eGFR. SNP rs41272663 was mapped to LANCL1, an antioxidant gene protecting neurons from oxidant damage (Huang et al. 2014). SNP rs13099628 was mapped to SCN11A, encoding a voltage-gated sodium ion channel (Nav1.9) associated with pain perception (Leipold et al. 2013). Detailed annotations for all 11 shared loci are shown in Supplementary Table 12.
For each of the 11 shared loci, a 99% credible set of the causal variant (Supplementary Table 13) was determined, including a median of 22 variants (ranges: 1–197). Notably, at the locus of index SNP rs1047891, the 99% credible set consisted of only one single variant (rs1047891 itself) for migraine–eGFR and migraine–UACR, and of only two variants (rs1047891 and rs715) for migraine–CKD, stressing again its putative causal role.
Furthermore, for the 11 shared loci, a majority (seven, 64%) colocalized at the same candidate causal variant (PPH4 > 0.7), while four colocalized at different candidate causal variants (PPH3 > 0.7). Of note, both fine-mapping and colocalization analyses supported a shared causal variant for migraine with CKD, eGFR, and UACR at rs1047891 (Supplementary Table 14).
Transcriptome-wide association study
To investigate specific tissue–gene pairs shared by migraine, CKD, and kidney function, we performed TWAS using two different data sources of gene expression (GTEx and CMC). No overlapping tissue–gene pair was found for migraine and CKD using either tissue. For kidney function, 19 significant tissue–gene pairs were found for migraine and eGFR using GTEx tissues, including four genes (TREX1, SHISA5, PRR13, TMA7) mainly expressed in tissues of the nervous and cardiovascular system (Table 3). Among these genes, TREX1 remained significant using CMC brain tissues, previously reported to associate with migraine (Sutherland and Griffiths 2017). Furthermore, nine significant tissue–gene pairs were found for migraine and UACR using GTEx tissues, including four genes (NBEAL1, FAM117B, ICA1L) mainly expressed in tissues of the nervous and cardiovascular system. Among these genes, ICA1L remained significant using CMC brain tissues, which was also identified by our cross-trait meta-analysis and the previous UACR GWAS (Teumer et al. 2019).
Mendelian randomization analysis
Finally, we performed a bidirectional two-sample MR to make causal inference (Fig. 3). Genetically predisposed migraine did not seem to affect CKD risk (OR = 1.03, 95% CI = 0.98–1.09; P = 0.28). Conversely, genetically predisposed CKD also did not seem to influence migraine onset (OR = 1.03, 95% CI = 0.99–1.08; P = 0.17). For kidney function, genetically predisposed migraine was significantly associated with a higher level of UACR (beta = 0.02, 95% CI = 0.01–0.04; P = 1.92 × 10–3), while the effect attenuated to null when accounting for correlated and uncorrelated pleiotropy (beta = 0.01, 95% CI = − 0.001–0.02; P = 0.23) or adjusting for systolic blood pressure (beta = 0.01, 95% CI = − 0.01–0.02; P = 0.29; Supplementary Table 15). Conversely, genetically predicted UACR was not associated with migraine (OR = 0.90, 95% CI = 0.74–1.11; P = 0.33). There was no significant association between migraine and eGFR. The results remained consistent when restricting analyses for MA and MO (Supplementary Fig. 1).
Bidirectional mendelian randomization analysis between migraine and chronic kidney disease. The blue boxes denote point estimates of the causal effects, and the error bars denote 95% confidence intervals (CI). CKD chronic kidney disease; eGFR estimated glomerular filtration rate; UACR urinary albumin-to-creatinine ratio
The mean F-statistics of our IVs were larger than 50 (Supplementary Table 7), indicating strong instruments. With the current sample size of outcome, assuming 0.81% (migraine) and 0.32% (CKD) of phenotypic variance explained by IVs based on the data we used, our study had more than 80% statistical power to detect an OR of 1.16 for migraine on CKD and 1.24 for CKD on migraine, respectively.
Discussion
To the best of our knowledge, this is the most comprehensive observational and genetic analysis that systematically investigates the phenotypic association, genetic correlation, pleiotropic loci, expression–trait association, and causal relationship between migraine, CKD, and kidney function. In observational analysis, we found no strong phenotypic link between migraine and CKD. Genetic analysis suggested a weak genetic relationship between migraine and CKD with merely one candidate pleiotropic variant identified, while four specific genomic regions showing significant local signals were found for migraine and eGFR, relaxing the binary disease status to the continuous physiological measure. Such genetic overlap was further substantiated by 10 pleiotropic loci and 28 shared expression–trait associations for migraine and kidney function, primarily tagging tissues of nervous and cardiovascular systems. However, we found limited evidence to support a causal effect of migraine on CKD and kidney function. These findings advance our understanding of the relationship underlying migraine and CKD, providing potential implications for disease prevention strategies.
In contrast to previous observational studies, we found a minimal phenotypic and genetic link underlying migraine and CKD. In observational analysis, the age and sex-adjusted hazard of CKD was 1.32 (95% CI = 1.07–1.61), which was largely consistent with one (and the only) existing observational study reporting a relatively small effect (HR = 1.22, 95% CI = 1.02–1.47) (Weng et al. 2017). When we further adjusted for other covariates in the subset of participants with more complete data on risk factors, the effect attenuated with adjustment for antimigraine medication usage and was null in fully adjusted model. Such a weak phenotypic link was corroborated by genetic findings of neither significant a genetic correlation nor a putative causal association, with merely one pleiotropic causal variant (rs1047891) identified. These findings are perhaps not very surprising as similar patterns have been observed for migraine with macrovascular diseases, while observational studies consistently indicate strong phenotypic associations between migraine, coronary artery disease, and stroke (Ng et al. 2022), genetic analyses show minimal shared basis (Pickrell et al. 2016; Siewert et al. 2020) with significant results only found at the individual variant level.
Despite the ambiguous findings for migraine with CKD, we found consistent and robust evidence supporting for a shared genetic architecture between migraine and kidney function. This is not against our expectation as the latter reflects a continuous physiological measure, a measurement of higher granularity that could be used to determine a binary disease outcome. We identified four significant local signals for migraine and eGFR, supporting a brain–kidney interconnection driven by a shared genetic basis. The strongest local signal was at 4q24 harboring NFKB1, a gene encoding the subunits of NFκB transcription factor, activation of which contributes to local inflammation and headaches (Reuter et al. 2002), as well as to age-related decline in kidney function (O'Brown et al. 2015).
Results from cross-trait meta-analysis suggest that the intrinsic link observed for migraine and kidney function may largely be explained by biological pleiotropy. We highlight a candidate causal variant (rs1047891) shared for migraine with kidney function as well as with CKD. This pleiotropic SNP is located near CPS1, encoding a mitochondrial enzyme named carbamoyl-phosphate synthase 1 that controls the synthesis of carbamoyl phosphate from ammonia in the initial step of urea cycle. Individuals with a CPS1 deficiency typically present hyperammonemia with a wide range of clinical manifestations, including migraine, abdominal pain, vomiting, and decreased urea production (Haberle et al. 2019; Raina et al. 2020). Follow-up experimental studies are needed to validate the role of the identified candidate causal variant. Of note, we found several shared genetic variants whose signs of effect estimates are opposite to the direction that would be predicted from the global genetic correlation. This likely implies the heterogeneous pathways shared by migraine and kidney function.
TWAS analysis takes us one level down from the variant-based association to the gene-based association in disease-related or potentially pathological tissues. We found multiple shared expression–trait associations between migraine and kidney function. Here, we highlight two pleiotropic genes (TREX1 and ICA1L) replicated by using the CMC brain tissue. TREX1, shared by migraine and eGFR, and expressed in the brain, artery, spleen, and many other tissues, encodes a 3’ to 5’ DNA exonuclease known to regulate immunity and repair DNA. In human neural cells, deficiency of TREX1 contributes to the accumulation of extranuclear DNA, thereby inducing neurotoxicity through increased type I interferon secretion (Thomas et al. 2017), which may play a role in the etiology of migraine (Yazgan and Naziroglu 2021). Furthermore, mutations in TREX1 may contribute to renal thrombotic microangiopathy through increased type I interferon secretion and concurrent autoimmune activation (Gulati et al. 2018). In addition, ICA1L, shared by migraine and UACR, and expressed in the brain, artery, pancreas, and skin tissues, encodes islet cell autoantigen 1-like (ICA1L) protein that is involved in protein domain specific binding activity and regulation of transport. Findings from cell-type specificity analysis in the brain have identified enrichment in the ICA1L expression in glutamatergic excitatory neurons (Ou et al. 2021), while malfunctioning of the glutamatergic system may cause symptoms of migraine (Gasparini et al. 2016). Previous proteome-wide association studies have discovered the brain protein abundance of ICA1L to affect cerebral small vessel diseases (Cullell et al. 2022) and Alzheimer’s disease (Ou et al. 2021). To date, little is known regarding the exact biological functions of TREX1 and ICA1L in migraine and kidney function, and future functional studies are worth revealing their roles.
Our findings provide potential public health as well as clinical implications. First, migraine does not seem to cause CKD. The excess risk of CKD among individuals with migraine is probably attributed to shared environmental factors. For people with migraine to be identified as high CKD risk, the coexistence of shared risk factors is required and such established risk factors (e.g., hypertension) should be treated as clinical guideline recommendations. Avoiding unnecessary intervention makes sense for individuals with migraine because triptans as a first-line treatment for moderate or severe migraine attacks have the potential kidney toxicity to do harm (Mobasheran et al. 2020). Second, migraine, CKD, and kidney function are inherently linked through biological pleiotropy. SNP rs1047891 is a candidate causal variant shared by migraine, CKD, and kidney function. Our findings may provide implications for the design of future functional experiments. Prospectively, the identification of specific pleiotropic loci modulating common biological pathways may facilitate the discovery of broad-spectrum therapeutic targets that would benefit both the precision prevention and treatment of chronic comorbidities.
We acknowledge several potential limitations. First, our findings were restricted to individuals of European ancestry, which may not be generalizable to other ancestral populations. Further research of this topic leveraging data from other ethnicities is warranted. Second, a substantial sample overlap (59.2%) exists across GWAS of migraine and GWAS of UACR. However, the lower end of the one-sided 95% CI for F-statistic remained high (55.6 for migraine IVs and 48.1 for UACR IVs), thus considerable weak instrument bias in our two-sample MR was not expected (Burgess et al. 2016). Sample overlap is another issue that might introduce bias due to an inflated type 1 error rate (false positive findings). This, however, was not a concern in our two-sample MR analysis as all findings were null (negative findings). Future research with independent samples to derive IV-exposure and IV-outcome associations is needed. Nevertheless, the genome-wide cross-trait analytical approaches we have applied (e.g., LDSC, SUPERGNOVA, CPASSOC) are all robust to sample overlap (Bulik-Sullivan et al. 2015; Zhang et al. 2021; Zhu et al. 2015). Third, our cross-phenotype results were restricted to overall migraine without subtyping, as the sample size of the hitherto available genetic studies on migraine subtypes was too small to withstand the statistical burdens of genome-wide cross-trait analysis. Future GWAS of migraine subtypes with larger sample sizes are required to understand the subtype-specific effect. Fourth, notwithstanding substantial efforts to enhance the total sample size, we still had limited power to detect the causal effect of migraine on CKD through traditional MR, perhaps due to a small phenotypic variance explained by IVs. However, we replicated the results with an increased power by relaxing the outcome from a binary disease status (CKD) to a continuous physiological measure (eGFR and UACR), and obtained consistent findings.
Conclusions
To conclude, leveraging large-scale observational and genetic data of European ancestry, our work does not find evidence to support a causal association between migraine and CKD. However, our study highlights significant biological pleiotropy between migraine and kidney function. Our findings provide novel insights into precision prevention and medicine for cardiovascular comorbidities with migraine.
Data availability
Data from UK Biobank is available for open access to scientific researchers (www.biobank.ac.uk). The UK Biobank analysis was conducted within the application 50,538. GWAS summary statistics for migraine excluding 23 and Me are available for bona fide researchers (contact Dale R Nyholt, d.nyholt@qut.edu.au), and GWAS summary statistics for CKD, eGFR, and UACR are available through the CKDGen Consortium (https://ckdgen.imbi.uni-freiburg.de/).
Abbreviations
- BMI:
-
Body mass index
- CKD:
-
Chronic kidney disease
- CMC:
-
CommonMind Consortium
- CPASSOC:
-
Cross-Phenotype Association
- eGFR:
-
Estimated glomerular filtration rate
- GTEx:
-
Genotype-Tissue Expression Project
- GWAS:
-
Genome-wide association study
- IHGC:
-
International Headache Genetics Consortium
- IV:
-
Instrumental variable
- IVW:
-
Inverse-variance weighted
- MA:
-
Migraine with aura
- MO:
-
Migraine without aura
- MR:
-
Mendelian randomization
- PIP:
-
Posterior inclusion probability
- TWAS:
-
Transcriptome-wide association study
- UACR:
-
Urinary albumin-to-creatinine ratio
- UKB:
-
UK Biobank
- VEP:
-
Variant effect predictor
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Acknowledgements
We would like to thank the participants and researchers from the International Headache Genetics Consortium who contributed or collected data. We are grateful to the CKDGen Consortium for making the complete meta-GWAS summary statistics publicly available. International Headache Genetics Consortium: Verneri Anttila1,2,3, Ville Artto4, Andrea C Belin5, Anna Bjornsdottir6, Gyda Bjornsdottir7, Dorret I Boomsma8, Sigrid Børte9,10,11, Mona A Chalmer12, Daniel I Chasman13,14, Bru Cormand15, Ester Cuenca-Leon16, George Davey-Smith17, Irene de Boer18, Martin Dichgans19,20, Tonu Esko21, Tobias Freilinger22,23, Padhraig Gormley24, Lyn R Griffiths25, Eija Hämäläinen26, Thomas F Hansen12,27, Aster VE Harder18,28, Heidi Hautakangas26, Marjo Hiekkala29, Maria G Hrafnsdottir30, M. Arfan Ikram31, Marjo-Riitta Järvelin32,33,34,35, Risto Kajanne26, Mikko Kallela4, Jaakko Kaprio26, Mari Kaunisto29, Lisette JA Kogelman12, Espen S Kristoffersen36,37,38, Christian Kubisch39, Mitja Kurki40, Tobias Kurth41, Lenore Launer42, Terho Lehtimäki43, Davor Lessel39, Lannie Ligthart8, Sigurdur H Magnusson7, Rainer Malik19, Bertram Müller-Myhsok44, Carrie Northover45, Dale R Nyholt46, Jes Olesen12, Aarno Palotie26,47, Priit Palta26, Linda M Pedersen48, Nancy Pedersen49, Matti Pirinen26,50,51, Danielle Posthuma52, Patricia Pozo-Rosich53, Alice Pressman54, Olli Raitakari55,56,57, Caroline Ran5, Gudrun R Sigurdardottir6, Hreinn Stefansson7, Kari Stefansson7, Olafur A Sveinsson30, Gisela M Terwindt18, Thorgeir E Thorgeirsson7, Arn MJM van den Maagdenberg18,28, Cornelia van Duijn58, Maija Wessman26,29, Bendik S Winsvold9,48,59, John-Anker Zwart9,10,48. 1Analytical and Translational Genetics Unit, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA; 2Program in Medical and Population Genetics, Broad Institute of MIT and Harvard, Cambridge, Massachusetts, USA; 3Stanley Center for Psychiatric Research, Broad Institute of MIT and Harvard, Cambridge, Massachusetts, USA; 4Department of Neurology, Helsinki University Central Hospital, Helsinki, Finland; 5Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden; 6Neurology private practice, Laeknasetrid, Reykjavik, Iceland; 7deCODE genetics/Amgen Inc., Reykjavik, Iceland; 8Netherlands Twin Register, Department of Biological Psychology, Vrije Universiteit, Amsterdam, the Netherlands; 9K.G. Jebsen Center for Genetic Epidemiology, Department of Public Health and Nursing, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway; 10Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway; 11Research and Communication Unit for Musculoskeletal Health, Department of Research, Innovation and Education, Division of Clinical Neuroscience, Oslo University Hospital, Oslo, Norway; 12Danish Headache Center, Department of Neurology, Copenhagen University Hospital, Copenhagen, Denmark; 13Department of Medicine, Division of Preventive Medicine, Brigham and Women's Hospital, Boston, Massachusetts, USA; 14Harvard Medical School, Boston, Massachusetts, USA; 15Department of Genetics, Spain Centre for Biomedical Network Research on Rare Diseases, University of Barcelona, Barcelona, Spain; 16Pediatric Neurology Research Group, Vall d'Hebron Research Institute, Barcelona, Spain; 17University of Bristol/Medical Research Council Integrative Epidemiology Unit, University of Bristol, Bristol, UK; 18Department of Neurology, Leiden University Medical Centre, Leiden, the Netherlands; 19Institute for Stroke and Dementia Research, University Hospital, LMU Munich, Munich, Germany; 20Munich Cluster for Systems Neurology, Munich, Germany; 21Estonian Biobank Registry, the Estonian Genome Center, University of Tartu, Tartu, Estonia; 22Department of Neurology, Klinikum Passau, Passau, Germany; 23Department of Neurology and Epileptology, Hertie Institute for Clinical Brain Research, University of Tuebingen, Tuebingen, Germany; 24GSK Inc., Cambridge, Massachusetts, USA; 25Centre for Genomics and Personalised Health, Queensland University of Technology, Brisbane, Queensland, Australia; 26Institute for Molecular Medicine Finland, Helsinki Institute of Life Science, University of Helsinki, Helsinki, Finland; 27Novo Nordic Foundation Center for Protein Research, Copenhagen University, Copenhagen, Denmark; 28Department of Human Genetics, Leiden University Medical Centre, Leiden, the Netherlands; 29Folkhälsan Research Center, Helsinki, Finland; 30Landspitali University Hospital, Reykjavik, Iceland; 31Department of Epidemiology, Erasmus University Medical Center, Rotterdam, the Netherlands; 32Department of Epidemiology and Biostatistics, MRC-PHE Centre for Environment and Health, School of Public Health, Imperial College London, London, UK; 33Center for Life Course Health Research, Faculty of Medicine, University of Oulu, Oulu, Finland; 34Unit of Primary Health Care, Oulu University Hospital, OYS, Oulu, Finland; 35Department of Life Sciences, College of Health and Life Sciences, Brunel University London, London, UK; 36Research and Communication Unit for Musculoskeletal Health, Department of Research, Innovation and Education, Division of Clinical Neuroscience, Akershus University Hospital and University of Oslo, Oslo, Norway; 37Department of General Practice, Institute of Health and Society, University of Oslo, Oslo, Norway; 38Department of Neurology, Akershus University Hospital, Lørenskog, Norway; 39Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; 40Psychiatric and Neurodevelopmental Genetics Unit, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA; 41Institute of Public Health, Charité – Universitätsmedizin, Berlin; 42Laboratory of Epidemiology and Population Sciences, Intramural Research Program, National Institute on Aging, Bethesda, Maryland, USA; 43Department of Clinical Chemistry, Fimlab Laboratories, and Finnish Cardiovascular Research Center - Tampere, Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland; 44Max Planck Institute of Psychiatry, Munich, Germany; 4523&Me Inc., Mountain View, California, USA; 46School of Biomedical Sciences, Faculty of Health, Centre for Genomics and Personalised Health, Centre for Data Science, Queensland University of Technology, Brisbane, Queensland, Australia; 47University of Helsinki, Helsinki, Finland; 48Department of Research, Innovation and Education, Division of Clinical Neuroscience, Oslo University Hospital, Oslo, Norway; 49Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; 50Department of Mathematics and Statistics, University of Helsinki, Helsinki, Finland; 51Department of Public Health, University of Helsinki, Helsinki, Finland; 52Department of Complex Trait Genetics, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University, Amsterdam, The Netherlands; 53Headache Unit, Neurology Department, Vall d'Hebron University Hospital, Barcelona, Spain; 54Sutter Health, Sacramento, California, USA; 55Centre for Population Health Research, University of Turku, Turku University Hospital, Turku, Finland; 56Research Centre of Applied and Preventive Cardiovascular Medicine, University of Turku, Turku, Finland; 57Department of Clinical Physiology and Nuclear Medicine, Turku University Hospital, Turku, Finland; 58Department of Epidemiology, Erasmus University Medical Centre, Rotterdam, the Netherlands; 59Department of Neurology, Oslo University Hospital, Oslo, Norway.
Funding
Open access funding provided by Karolinska Institute. This study was supported by the National Key R&D Program of China (2022YFC3600600, 2022YFC3600604), the National Natural Science Foundation of China (U22A20359, 81874283, 81673255), the Recruitment Program for Young Professionals of China, the Promotion Plan for Basic Medical Sciences and the Development Plan for Cutting-Edge Disciplines, Sichuan University, and other Projects from West China School of Public Health and West China Fourth Hospital, Sichuan University. The sponsors of this study had no role in study design, data collection, analysis, interpretation, writing of the report, or the decision for submission.
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BZ and XJ conceived and supervised the study. WZ, LZ, CX, XW, PY, HC, CY, JZ, XW, MT, YW, LC, YL, and YZ did the analyses. WZ, BZ, and XJ drafted the manuscript with significant contributions from LY, LZ, CY, YY, JL, and ZL. All authors contributed to the interpretations of the findings, critically revised the paper, and had final responsibility for the decision to submit for publication.
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UK Biobank participants provided written informed consent, and ethical approval was granted by the National Health Service North West Multi-Centre Research Ethics Committee (11/NW/0382). All GWAS summary statistics are publicly available, and the corresponding studies have obtained proper IRB approval and participants’ consent.
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Members of the International Headache Genetics Consortium are listed in the Acknowledgements section.
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Zhang, W., Zhang, L., Yang, L. et al. Migraine, chronic kidney disease and kidney function: observational and genetic analyses. Hum. Genet. 142, 1185–1200 (2023). https://doi.org/10.1007/s00439-023-02575-9
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DOI: https://doi.org/10.1007/s00439-023-02575-9