Genome-scale profiling of gene function by genetic interactions and single-cell phenotyping

<strong>Cellular and organismal phenotypes are controlled by complex gene regulatory networks. However, reference maps of gene function are still scarce across different organisms. Here, we generated synthetic genetic interaction and cell morphology profiles of more than 6,800 genes in cultured </strong><em><strong>Drosophila</strong></em><strong> cells. The resulting map of genetic interactions was used for machine learning-based gene function discovery, assigning function to genes in 47 modules. Further, we developed Cytoclass, as a method to analyze genetic interactions for discrete cell states at the single cell level. This approach identified an interaction of Cdk2 and the Cop9 signalosome complex, triggering senescence-associated secretory phenotypes and immunogenic conversion in hemocytic cells. Together, our data represent a genome-scale resource of functional gene profiles to uncover mechanisms underlying genetic interactions and their plasticity at the single cell level.</strong>