A multi-tissue epigenomic atlas links the sheep non-coding genome to domestication and complex traits

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Abstract Non-coding regulatory variation drives complex traits, domestication, and evolutionary adaptation, yet the sheep genome lacks high-resolution functional annotation. Here we present SheepEpimap, a multi-tissue regulatory atlas harmonizing 516 CUT&Tag histone modifications, ATAC-seq, and RNA-seq datasets across 43 adult tissues in sheep. We annotated 2.93 million cis -regulatory elements, yielding 557,441 enhancer–gene pairs and 145,407 variants with allele-specific effects. By training a sequence-to-function deep-learning model, we decoded the base-pair syntax of chromatin accessibility, annotated transcription factor motif instances genome-wide, and constructed 12,210 tissue-specific gene regulatory networks (GRNs). Integrating this resource with multi-tissue expression quantitative trait loci, selection sweeps, and genome-wide association studies prioritized non-coding variants driving domestication and complex traits. Finally, cross-species analysis revealed that sequence-conserved, tissue-matched enhancers were significantly enriched in heritability of complex traits and diseases in humans. In summary, SheepEpimap ( https://genome.ucsc.edu/s/mengzhu/SheepEpimap ) provides an open-access foundational ecosystem for sheep functional genomics, precision breeding, and comparative biology.

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