A reference map of the human protein interactome

Abstract Global insights into cellular organization and function require comprehensive understanding of interactome networks. Similar to how a reference genome sequence recently revolutionized human genetics, a reference map of the human interactome network is critical to fully understand genotype-phenotype relationships. Here, we present the first human “all-by-all” binary reference interactome map, or “HuRI”. With ∼53,000 high-quality protein-protein interactions (PPIs), HuRI is approximately four times larger than the information curated from small-scale studies available in the literature. Integrating HuRI with genome, transcriptome and proteome data enables the study of cellular function within essentially any physiological or pathological cellular context. We demonstrate the use of HuRI in identifying specific subcellular roles of PPIs and protein function modulation via splicing during brain development. Inferred tissue-specific networks reveal general principles for the formation of cellular context-specific functions and elucidate potential molecular mechanisms underlying tissue-specific phenotypes of Mendelian diseases. HuRI thus represents an unprecedented, systematic reference linking genomic variation to phenotypic outcomes.