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    # GTEx Database Skill Summary

## Purpose
This skill enables querying the Genotype-Tissue Expression (GTEx) portal to investigate tissue-specific gene expression, expression quantitative trait loci (eQTLs), and splicing QTLs—critical for connecting GWAS variants to regulatory mechanisms.

## Primary Use Cases
The documentation identifies several key applications:
- Linking non-coding GWAS variants to regulated genes via eQTL analysis
- Comparing expression patterns across 54 human tissues
- Testing whether GWAS and eQTL signals share causal variants
- Identifying variants affecting RNA splicing ratios

## Core Technical Components

**API Foundation**: The GTEx REST API v2 (base: `https://gtexportal.org/api/v2/`) provides JSON responses without authentication and supports pagination.