Schema for GTEx Tissue eQTL - Expression QTLs in 44 tissues from GTEx (midpoint release, V6)
  Database: hg19    Primary Table: gtexEqtlTissueArteryTibial    Row Count: 162,090   Data last updated: 2017-10-25
Format description: BED 9+ of expression Quantitative Trait Loci (eQTL). These are variants affecting gene expression
On download server: MariaDB table dump directory
fieldexampleSQL type info description
bin 590int(10) unsigned range Indexing field to speed chromosome range queries.
chrom chr1varchar(255) values Reference sequence chromosome or scaffold
chromStart 719913int(10) unsigned range Start position in chromosome
chromEnd 719914int(10) unsigned range End position in chromosome
name rs187772768/RP11-206L10.2varchar(255) values Variant/gene pair
score 6int(10) unsigned range Score from 0-1000 (highest probabiliity in cluster * 1000)
strand .char(1) values .
thickStart 719913int(10) unsigned range Start position
thickEnd 719914int(10) unsigned range End position
itemRgb 16752800int(10) unsigned range R,G,B color: red +effect, blue -effect. Bright for high, pale for lower (cutoff effectSize 2.0 RPKM).
variant rs187772768varchar(255) values Variant (rsID or GTEx identifier if none)
geneId ENSG00000228327.2varchar(255) values Target gene identifier
gene RP11-206L10.2varchar(255) values Target gene symbol
distance 5908int(11) range Distance from TSS
effectSize 0.622float range Effect size (FPKM)
pValue 9.27float range Nominal p-value
causalProb 0.006float range Probability variant is in high confidence causal set

Sample Rows
 
binchromchromStartchromEndnamescorestrandthickStartthickEnditemRgbvariantgeneIdgenedistanceeffectSizepValuecausalProb
590chr1719913719914rs187772768/RP11-206L10.26.719913719914255,160,160rs187772768ENSG00000228327.2RP11-206L10.259080.6229.270.006
590chr1723818723819rs11804171/ENSG00000224956.531.723818723819160,160,255rs11804171ENSG00000224956.5ENSG00000224956.560292-0.3244.8480.031
590chr1727141727142rs28641938/RP11-206L10.27.727141727142255,160,160rs28641938ENSG00000228327.2RP11-206L10.2131360.6149.3320.007
590chr1729631729632rs116720794/RP11-206L10.27.729631729632255,160,160rs116720794ENSG00000228327.2RP11-206L10.2156260.6149.3320.007
590chr1736288736289rs79010578/RP4-669L17.108.736288736289255,160,160rs79010578ENSG00000237094.7RP4-669L17.104185690.1026.80.008
590chr1746211746211rs201075335/RP11-206L10.233.746211746211255,160,160rs201075335ENSG00000228327.2RP11-206L10.2322050.46610.6730.033
590chr1746211746211rs201075335/RP11-206L10.913.746211746211255,160,160rs201075335ENSG00000237491.4RP11-206L10.9320610.13412.4640.013
590chr1746726746727rs144595511/RP11-206L10.232.746726746727255,160,160rs144595511ENSG00000228327.2RP11-206L10.2327210.46610.6640.032
590chr1746726746727rs144595511/RP11-206L10.913.746726746727255,160,160rs144595511ENSG00000237491.4RP11-206L10.9325770.13312.4510.013
590chr1747753747755rs200313238/RP11-206L10.214.747753747755255,160,160rs200313238ENSG00000228327.2RP11-206L10.2337470.5100.014

Note: all start coordinates in our database are 0-based, not 1-based. See explanation here.

GTEx Tissue eQTL (gtexEqtlTissue) Track Description
 

Description

This track shows genetic variants likely affecting proximal gene expression in 44 human tissues from the Genotype-Tissue Expression (GTEx) V6 data release. The data items displayed are gene expression quantitative trait loci within 1MB of gene transcription start sites (cis-eQTLs), significantly associated with gene expression and in the credible set of variants for the gene at a high confidence level (95%). Each eQTL annotation includes the significance of the association, effect size on gene expression, and the probability the eQTL is a member of the 95% credible set (the set containing all causal variants for the gene locus, at 95% confidence level).

Display Conventions

The eQTL item color indicates the effect size attributed to the eQTL:

    red  high positive
    light red  moderate positive
    light blue  moderate negative
    blue  high negative
    mixed  positive and negative effect in combined eQTL
Effect size is the regression slope, computed from the effect of the alternative allele vs. the reference in FPKM units, based on quantile normalized expression tables. For display purposes, An arbitrary cutoff of +- 2.0 FPKM defines high effect size.

Combined eQTL track

Gene/variant pairs occurring in multiple tissues are combined into a single item in the display. The item label shows the number of tissues where the eQTL was identified, or the tissue name and the GTEx-convention tissue color if the eQTL was identified solely in one tissue. Mouseover lists all tissues affected and the effect size. The item color reflects the largest effect size in any tissue.

Track configuration supports filtering by gene, effect size, or probability. Tissues can be selected via checkboxes or from the UCSC GTEx Body Map graphic.
GTEx Combined eQTL Track Settings: hg19.

Tissue eQTL tracks

This track is a composite track containing 44 subtracks representing the GTEx eQTL tissues. Each subtrack contains all GTEx/CAVIAR eQTLs identified for that tissue.
GTEx 44 Tissues eQTL Track Settings: hg19.

Methods

Laboratory and RNA-seq analysis methods for GTEx V6 are summarized in the GTEx Gene Track description page.

Cis-eQTL's were identified from GTEx RNA-seq and genotype data (variants with minor allele frequency >= 1%) in 44 tissues (those with sample size >=70) using the FastQTL mapper at 5% FDR threshold, by the GTEx Laboratory, Data Analysis and Coordinating Center (LDACC), as part of the GTEx project v6p analysis. These cis-eQTL's were then analyzed together with genome variation information (LD) using the CAVIAR statistical framework to quantify the probability a variant is causal, at the Eskin lab at UCLA, as part of GTEx downstream analysis. The UCSC track was created using the CAVIAR 95% credible set, with significance p-values and effect sizes from the LDACC analysis.

Raw data for these analyses are available from dbGaP (phs000424.v6.p1).

Credits

Thanks to GTEx investigators and analysts -- particularly Farhad Hormozdiari (currently at the Price lab, Harvard), the Eskin lab at UCLA, the GTEx Laboratory, Data Analysis and Coordinating Center and analysts and portal team for providing this data, and to Christopher Brown (U Penn) , for input on design of the track.

References

GTEx Consortium., Laboratory, Data Analysis &Coordinating Center (LDACC)—Analysis Working Group., Statistical Methods groups—Analysis Working Group., Enhancing GTEx (eGTEx) groups., NIH Common Fund., NIH/NCI., NIH/NHGRI., NIH/NIMH., NIH/NIDA., Biospecimen Collection Source Site—NDRI. et al. Genetic effects on gene expression across human tissues. Nature. 2017 Oct 11;550(7675):204-213. PMID: 29022597

Ongen H, Buil A, Brown AA, Dermitzakis ET, Delaneau O. Fast and efficient QTL mapper for thousands of molecular phenotypes. Bioinformatics. 2016 May 15;32(10):1479-85. PMID: 26708335; PMC: PMC4866519

Hormozdiari F, Kostem E, Kang EY, Pasaniuc B, Eskin E. Identifying causal variants at loci with multiple signals of association. Genetics. 2014 Oct;198(2):497-508. PMID: 25104515; PMC: PMC4196608

GTEx Consortium. The Genotype-Tissue Expression (GTEx) project. Nat Genet. 2013 Jun;45(6):580-5. PMID: 23715323; PMC: PMC4010069

GTEx Portal Documentation