Most of the millions of SNPs in the human genome are non-coding, and many overlap with putative regulatory elements. Genome-wide association studies (GWAS) have linked many of these SNPs to human traits or to gene expression levels, but rarely with sufficient resolution to identify the causal SNPs. Functional screens based on reporter assays have previously been of insufficient throughput to test the vast space of SNPs for possible effects on regulatory element activity. Here we leveraged the throughput and resolution of the survey of regulatory elements (SuRE) reporter technology to survey the effect of 5.9 million SNPs, including 57% of the known common SNPs, on enhancer and promoter activity. We identified more than 30,000 SNPs that alter the activity of putative regulatory elements, partially in a cell-type-specific manner. Integration of this dataset with GWAS results may help to pinpoint SNPs that underlie human traits.
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Raw SuRE sequencing data are available at GEO (https://www.ncbi.nlm.nih.gov/geo/) under accession GSE128325. SuRE count tables, BigWig files for visualization of SuRE data tracks in genome browsers, lists of raQTLs and a table with SuRE data for all 5.9 million SNPs are available from the Open Science Framework (https://osf.io/w5bzq/wiki/home/?view). SuRE data can also be queried and visualized at https://sure.nki.nl. URLs to external data sources are listed in Supplementary Table 3.
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We thank the NKI Genomics Core Facility and Research IT team for technical support, the RHPC facility of the Netherlands Cancer Institute for providing computational resources and members of our laboratories for helpful discussions. Supported by ERC Advanced Grant no. 694466 (to B.v.S.); ERC Starting Grant no. 637587 (to E.d.W.); NIH grant no. R01HG003008 and Columbia University’s Vagelos Precision Medicine Pilot Program (to H.J.B.). F.C. was supported by a Swiss National Science Foundation postdoctoral fellowship (no. P2EZP3_165206). J.v.A., L.P., M.d.H., M.P.B., F.C., R.H.v.d.W., H.T., E.d.W., M.V. and B.v.S. are part of the Oncode Institute, which is partly funded by the Dutch Cancer Society (KWF).
J.v.A. is founder of Gen-X B.V. (http://www.gen-x.bio/). E.d.W. is co-founder and shareholder of Cergentis B.V. F.C. is a co-founder of enGene Statistics GmbH.
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Integrated supplementary information
a. Inserted fragment size distribution for each SuRE library (bin size 25 bp). b. Histogram showing the coverage of each SNP position in the combined SuRE libraries. c. Same as (b) but now for each SNP allele. d. Representative ~0.5-Mb genomic region showing SuRE signals of HG02601, SuRE library 1 in K562 cells, together with DNase-seq and H3K27ac signals in K562 cells (Encode Project Consortium, 2012, Nature 489, 57-74). e. qq plot showing the distribution of Wilcoxon rank-sum test P-values for SNPs in SuRE in K562 (y-axis) compared to distribution of Wilcoxon rank-sum test P-values obtained after random shuffling the SuRE expression values for each SNP (x-axis). Shown is a random subset of 100,000 SNPs. Gray line indicates y=x diagonal. f. Same as (e) but for HepG2. g. Volcano plot showing for all raQTLs in K562 (n=19,237) the log2 difference in SuRE signals for the REF and the ALT allele (x-axis) and the associated Wilcoxon rank-sum test P-values (y-axis). h. Same as (g) but for HepG2 (n=14,183). i. Histogram showing for all raQTLs in K562 the probability of the nearest neighbor SNP also being a raQTL, as a function of their distance. The dotted gray line indicates probability 0.5. j. SuRE Wilcoxon rank-sum test P-values in K562 and HepG2 cells for all SNPs that are raQTLs in at least one of the two cell types (See Fig. 1e). Gray lines indicate the P-value cut-offs for each cell type. k. Histogram showing for all K562 specific raQTLs the SuRE signal of the strongest allele in K562 (blue) and in HepG2 (yellow). l. Same as (k) but for all HepG2 specific raQTLs.
a. Comparison of allelic imbalance of SuRE signals and H3K27ac ChIP-seq signals (normalized for genomic DNA allelic read counts) for raQTLs for which K562 cells are heterozygous and at least 10 H3K27ac reads covered the raQTL. REF: reference allele; ALT: alternative allele; OR: odds-ratio. b. Same as (a.) but for ATAC-seq. c-e. Average profile of DNase-seq (c), ATAC-seq (d) and H3K27ac (e) signal for all raQTLs that are heterozygous in K562 cells. The vertical gray lines indicate the raQTL position and the horizontal gray lines indicate the approximate background signal. Note how the signal relative to background is much better for DNase-seq than for these ATAC-seq or H3K27ac signals.
a. Frequencies of raQTLs in K562 cells (n=19,237; dark color) or matching control SNPs (n=19,237; pale color) among all non-exonic SNPs within 100 kb of TSSs of loss-of-function tolerant genes or loss-of-function intolerant genes (Lek et al. 2016, Nature 536, 285-291). b. Same as (a) but for HepG2 cells (n=14,183). c. Distributions of minor allele frequencies according to the 1000 Genomes Project (1000 Genomes Project Consortium, 2015. Nature 526, 68-74) for raQTLs (dark color) and matched control SNPs (pale color) in K562 cells. P-values are obtained with a Wilcoxon rank-sum test d. Same as (c) but for HepG2.
a. Odds ratios of concordance of whole blood eQTL and K562 raQTL SNPs, as a function of maximum distance to the TSS of the associated eGene. All odds ratios are significantly larger than 1 (one-sided Fisher’s exact test, P<3.6e-3 for all distance cutoffs). Analysis based on 623,210 SNPs that overlap between SuRE and eQTL datasets. b. Same as (a) but for liver eQTL SNPs that are raQTLs in HepG2. All odds ratios are significantly larger than 1 (P<2.3e-4 for all distance cutoffs). Analysis based on 186,613 SNPs that overlap between SuRE and eQTL datasets. c. Genome track plot combining SuRE data and eQTL mapping data for LYZ in whole blood, similar to main Fig. 4e. d. Protein binding analysis for rs554591, similar to main Fig. 4f. e. Barplots indicating fraction of reads containing each of the two alleles for rs623853 in K562 genomic DNA (left) and K562 DNase-seq reads (Encode Project Consortium, 2012, Nature 489, 57-74) (right). P-values are from one-sided Fisher exact test. f. Same as (e) but for rs554591.
Supplementary Figure 5 Unexplained allele-specific variation of NR_125431 expression before editing of rs3748136.
a. The A and G alleles of rs1053036 in NR_125431 are cis-linked to the A and G alleles of rs3748136, respectively. Linkage model is based on TLA mapping. This locus in K562 cells is most likely triploid. b. Fraction of reads containing each of the two alleles of SNP rs1053036 in NR_125431 in K562 genomic DNA (left) and K562 RNA-seq reads (right). P-value was obtained by a one-sided Fisher exact test. The complete lack of expression of the A allele of NR_125431 is unexpected and may point to a genetic defect of the A allele in K562 cells. c. Clonal lines derived from K562 cells show extreme expression variation of NR_125431. For CRISPR-based editing we proceeded with clone BL_2.
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van Arensbergen, J., Pagie, L., FitzPatrick, V.D. et al. High-throughput identification of human SNPs affecting regulatory element activity. Nat Genet 51, 1160–1169 (2019). https://doi.org/10.1038/s41588-019-0455-2
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