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The migration of primordial germ cells (PGCs) from their place of origin to the embryonic gonad is an essential reproductive feature in many animal species. In Drosophila melanogaster , a single G protein-coupled receptor, Trapped in endoderm 1 (Tre1), mediates germ cell polarization at the onset of active migration and directs subsequent migration of PGCs through the midgut primordium. How these different aspects of cell behavior are coordinated through a single receptor is not known. We demonstrate that two highly conserved domains, the E/N/DRY and NPxxY motifs, have overlapping and unique functions in Tre1. The Tre1-NRY domain via G protein signaling is required for reading and responding to guidance and survival cues controlled by the lipid phosphate phosphatases Wunen and Wunen2. In contrast, the Tre1-NPIIY domain has a separate role in Rho1- and E-cadherin-mediated polarization at the initiation stage independent of G protein signaling. We propose that this bifurcation of the Tre1 G protein-coupled receptor signaling response via G protein-dependent and independent branches enables distinct spatiotemporal regulation of germ cell migration.

Domain-specific control of germ cell polarity and migration by multifunction Tre1 GPCR