The kidneys integrate information from continuous systemic processes related to the absorption, distribution, metabolism and excretion (ADME) of metabolites. To identify underlying molecular mechanisms, we performed genome-wide association studies of the urinary concentrations of 1,172 metabolites among 1,627 patients with reduced kidney function. The 240 unique metabolite–locus associations (metabolite quantitative trait loci, mQTLs) that were identified and replicated highlight novel candidate substrates for transport proteins. The identified genes are enriched in ADME-relevant tissues and cell types, and they reveal novel candidates for biotransformation and detoxification reactions. Fine mapping of mQTLs and integration with single-cell gene expression permitted the prioritization of causal genes, functional variants and target cell types. The combination of mQTLs with genetic and health information from 450,000 UK Biobank participants illuminated metabolic mediators, and hence, novel urinary biomarkers of disease risk. This comprehensive resource of genetic targets and their substrates is informative for ADME processes in humans and is relevant to basic science, clinical medicine and pharmaceutical research.
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Meta-analysis summary statistics for SNPs that are associated with any metabolite at P < 5 × 10−8 will be integrated into the SNiPA database with its v3.4 release. Genome-wide summary statistics will be made available publicly through the GWAS catalog (https://www.ebi.ac.uk/gwas). Raw data for Extended Data Fig. 5 are available as source data with the supplementary materials.
Each use of software programs has been clearly indicated and information on the options that were used is provided in the Methods section. Source code to call programs is available upon request.
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The work of A.K. was supported by grants KO 3598/3-1 and KO 3598/5-1 (A.K.), Y.L. was supported by grant KO 3598/4-1 (A.K.), the work of M.W., U.T.S., F. Kotsis and A.K. was supported by the Collaborative Research Center (CRC) 1140 project no. 246781735 (A.K.), and the work of P. Schlosser and A.K. was supported by the CRC 992 (A.K.), all German Research Foundation (DFG). U.T.S. and M.W. were also supported by the Else Kroener Fresenius Foundation (NAKSYS project, A.K.). M.K. was funded by the DFG Transregional Collaborative Research Centers (TRR) 152 project no. 239283807 (M.K.) and CRC 1140 project number 246781735 (M.K.). M.K. and G.W. were supported by the Excellence Strategy of the German Federal and State Governments (Center for Integrative Biological Signalling Studies EXC 2189). G.K. was supported by the grants from the National Institute on Aging (NIA): RF1-AG057452-01, RF1-AG059093-01, RF1-AG058942-01 and U01-AG061359-01. Genotyping was supported by Bayer Pharma AG. The GCKD study is supported by the German Ministry of Education and Research (Bundesministerium für Bildung und Forschung, FKZ 01ER 0804, 01ER 0818, 01ER 0819, 01ER 0820 and 01ER 0821) and the KfH Foundation for Preventive Medicine (Kuratorium für Heimdialyse und Nierentransplantation e.V. –Stiftung Präventiv-medizin) and corporate sponsors (www.gckd.org). We are grateful for the willingness of the patients to participate in the GCKD study. The enormous effort of the study personnel of the various regional centers is highly appreciated. We thank the large number of nephrologists who provide routine care for the patients and who collaborate with the GCKD study. The GCKD Investigators are listed in the Supplementary Note. SHIP is part of the Community Medicine Research net of the University of Greifswald, Germany, which is funded by the BMBF (grants 01ZZ9603, 01ZZ0103 and 01ZZ0403), the Ministry of Cultural Affairs as well as the Social Ministry of the Federal State of Mecklenburg-Western Pomerania, and the network ‘Greifswald Approach to Individualized Medicine (GANI_MED)’ funded by the Federal Ministry of Education and Research (grant 03IS2061A). The work of K.S. was supported by the Biomedical Research Program at Weill Cornell Medicine in Qatar, a program funded by the Qatar Foundation. We would like to thank Z. Zheng from GCTA for an update that enables selection of index SNPs based on the Χ2 statistic, and Elizaveta Freinkman for the extracted ion chromatogram and fragmentation spectra used to confirm the identity of X-13689 as α-CMBHC glucuronide.
R.P.M. is an employee of Metabolon and, as such, has affiliations with or financial involvement with Metabolon. All other authors have no competing interests.
Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Schematic representation of the genome-wide screens for single metabolites (a) and eigenmetabolites (b) and their follow up analyses.
Each point represents one of the 240 replicated metabolite-associated mQTLs. Genetic effect size estimates per modeled risk allele including adjustment for eGFR and UACR (x axis) by linear regression, as done in the main analysis, were plotted against those obtained after adjustment for genetic PCs, age and sex only (y axis).
Extended Data Fig. 3 Evaluation of genetic associations of replicated mQTLs from CKD patients in a healthy population sample.
(a) Each point represents the index SNP of one of 90 associations that could be matched between the Metabolon platforms of the GCKD and SHIP-Trend studies (see Supplementary Table 5). Dot size is proportional to the -log10(P value) in GCKD and error bars represent 1.96x standard errors in each study. The red line corresponds to a linear regression based on the effect estimates of the most significant index SNP in each of the 35 unique genetic regions into which the 90 associations map. (b) 81 mQTLs with -log10(P value) >12 are plotted. In subsequent panels, the color codes correspond to the detection mode of the mass spectrometer (c), metabolite super pathway (d), differences in relative standard deviation based on measurements of duplicate samples as a measure of precision (e), and the percent of imputed values in GCKD (f). For strata with at least 10 matched mQTLs, additional regression lines were added with color-coding corresponding to the respective legends.
(a): Resampling based enrichment testing showed that the murine homologs of the 90 associated genes are enriched for cell type-specific expression in proximal tubule in mice (see Supplementary Table 8). The vertical line indicates the statistical significance threshold after Bonferroni adjustment; the arrow indicates a P value<1e-8. (b): Heatmap illustrates the relative expression of each associated gene across the murine kidney cell types; only genes with z-score >2 in at least one cell type are plotted. The mouse gene homologs are provided in parentheses. EC: endothelial cells; PT: proximal tubule; LOH: loop of Henle; DCT: distal convoluted tubule; PC: principal cells; IC: Intercalated cells; CD-Trans: collecting duct transient cells; NK: natural killer cells.
Extended Data Fig. 5 Association between the index SNP at SLC7A9 and pair-wise metabolite ratios reveals transported substrates in vivo.
The figure uses color coding to show the strength of associations (coefficient’s t-test statistics scaled to [-1,1]) between genotype and the 83 ratios that contained information beyond the associations of their individual components (P-gain >6,728,320, Methods), based on linear regression analysis of 672,832 pair-wise metabolite ratios (1172*1171/2, excl. 13,374 ratios with <300 measurements). Coefficient’s test statistics of results that did not confer additional information (P-gain ≤ 6,728,320) are uniformly presented in gray. The metabolite on the y axis represents the numerator and on the x axis the denominator of the respective ratio. Super-pathways: 01 amino acid, 02 carbohydrate, 04 energy, 05 lipid, 06 nucleotide, 08 peptide, 09 unknown. Metabolites that are a member of more than four associated metabolite ratios with a scaled test statistic >0.5 (absolute) are marked in bold. The T allele at rs12460876 was associated with higher gene expression, in agreement with greater tubular reuptake of lysine, resulting in lower urinary levels. Source data underlying this figure including number of values per ratio (column O) can be found in SourceDataEDF5.xlxs.
(a) shows the dendrogram of the metabolite clustering. The band of color indicates membership of each of the 1,172 metabolites in one of 212 clustered metabolite modules. (b) illustrates module ME193, for which metabolites are labeled. (c) displays the distribution of the eigenmetabolite of ME193 (y axis) with genotype at rs2147896 in PYROXD2 (x axis). (d) illustrates module ME161, for which metabolites are labeled. (e) displays the distribution of the eigenmetabolite of ME161 (y axis) with genotype at rs13538 in NAT8 (x axis). In (c) and (e) horizontal lines indicate medians, violin plots are clipped to the range of the 1,627 samples.
The light red band shows the –log10(P value) for genetic associations with eigenmetabolite levels, representing their respective module, by chromosomal position. Associations of all 212 eigenmetabolites in the 1627 samples are overlaid in the red band, are based on linear regressions, and association P values are capped at 1e-60. The blue line indicates genome-wide significance (P = 2.4e-10). For detail about significant associations see Supplementary Table 12. Black gene labels indicate genetic regions in which all members of a given module were also identified in the single metabolite mGWAS, orange labels indicate genetic regions where additional metabolites were implicated as members of a module. The light green band shows the maximum variance in eigenmetabolite levels explained by the index SNP at each genetic region by dark green circles, with the sizes of circles corresponding to different ranges of explained variance. The inner blue band shows a stacked representation of the number of implicated metabolites in each genetic region, is colored according to the super-pathways to which they belong, and the number of modules in the genetic region is given next to it. Color keys of metabolite super-pathways are presented in the middle.
Extended Data Fig. 8 Identification of the unknown metabolite X-13689 as the glucuronide of alpha-CMBHC.
The extracted ion chromatograms (upper right) show the same retention time for both the unknown metabolite in a reference urine matrix (“neat urine”) and the candidate molecule in a neat solution (“neat synthetic”). The MS/MS fragmentation spectra of the candidate molecule (lower left) and of the unknown metabolite (lower right) show the same fragments with equal relative intensities; consequently, the candidate molecule is verified. The m/z (observed) for X-13689 is 495.22438, and the m/z (predicted) for alpha-CMBHC glucuronide is 495.22357, representing a 1.6 ppm error. The 319.1921 fragment peak represents the loss of glucuronic acid (a loss of 176), from which a loss of CO2 (-43.9898) yields the 275.201 fragment peak.
Extended Data Fig. 9 Presence of colocalizing association signals for urinary metabolites and phenotypes and diseases in the UK Biobank.
Colocalizing associations (H4≥0.8, Methods) that showed associations at genome-wide significance (P<5e-8) with both metabolites and traits and diseases in the UK Biobank were found between 68 traits and 66 of the index SNPs. The strength of the associations based on their association P values with the UK Biobank trait are indicated by cross or asterisk as described in the legend. The traits are sorted into five groups: blood count-based parameters, anthropometry, lifestyle, medical conditions, and skin color (left to right). SNPs are sorted by gene and within gene by position. Genes where incorporation of existing biochemical and biological knowledge would have led to prioritization of another most likely causal gene are marked with a # (see Supplementary Note).
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Schlosser, P., Li, Y., Sekula, P. et al. Genetic studies of urinary metabolites illuminate mechanisms of detoxification and excretion in humans. Nat Genet 52, 167–176 (2020). https://doi.org/10.1038/s41588-019-0567-8
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