scTraitReg: a single-cell multi-omic database of trait-relevant transcription factor eRegulons.

Genome-wide association studies (GWAS) identify loci associated with human diseases and disease-related traits, but the regulators and cellular contexts linked to these signals remain difficult to resolve. We present scTraitReg, a database of trait-relevant transcription factor (TF) eRegulons-TFs with their target genes and linked cis-regulatory regions-at single-cell resolution. scTraitReg integrates 655 sets of curated GWAS summary statistics covering 122 Medical Subject Headings (MeSH) disease terms with 111 human single-cell multi-omic datasets profiling RNA and chromatin accessibility in the same cells. The resource spans 34 tissues, 252 cell types, 2 081 538 cells, and 2208 curated GWAS-single-cell analysis pairs. Across these analyses, it contains 2 840 939 TF-cell-type records for 886 regulators; 67 666 records met all three criteria-cell-type specificity, genetic relevance, and the trait-associated regulon score-and were included as candidate trait-relevant eRegulon records. Each record links to the TF-target regulatory network with its cis-regulatory regions, cell-type-resolved evidence, per-cell regulon module scores, and target-gene enrichment, all available as downloadable tables. Users can search by disease, tissue, cell type, or regulator and examine these associations through interactive visualizations. scTraitReg thus provides a searchable and reusable resource linking genetic associations to cell-type-specific regulatory programs, and is freely available at https://www.sctraitreg.bio/.