Which eQTL signal should be paired with the Graves’ disease locus?
Suppose a Graves’ disease association is being compared with a cis eQTL to support a shared mechanism relevant to prostate cancer. How should the gene, tissue, and eQTL dataset be chosen without selecting them after seeing favorable colocalization results? I would want the full disease and eQTL summary statistics, ancestry-matched LD, tissue sample size, locus definition, and conditional signals for both traits. Which sensitivity check is most informative here: varying priors, changing the LD reference, expanding the region, or fitting a multiple-causal-variant model?