Roundabout guidance receptor (Robo)

The Roundabout guidance receptor (Robo) family comprises single-pass transmembrane proteins highly conserved throughout the animal kingdom[1][2]. First discovered in Drosophila, these receptors are well-known for their essential role in axon guidance during nervous system development, particularly by mediating repellent signaling in response to the Slit protein family[1][2][3][4]. Slit-Robo signaling is fundamental in regulating commissural axon midline crossing, olfactory tract formation, optic nerve development, and motor axon fasciculation[1][2][3]. Besides neurodevelopment, Robo receptors also contribute to the development of multiple non-neural organs, including the lung, kidney, liver, muscle, and breast[1][2]. Genetic mutations in ROBO genes are associated with several human neurodevelopmental disorders and may contribute to certain cancers via deregulated cell migration and tissue patterning[1][2][4][5]. The canonical family members include ROBO1, ROBO2, ROBO3 (also known as Rig-1), and ROBO4; each may have slightly different roles but generally function as cell surface receptors mediating repulsive or attractive guidance via ligand-induced signaling[1][2][4]. The overall structure consists of Immunoglobulin-like domains and Fibronectin type-III repeats, essential for ligand binding and downstream signaling[3][5]. No small molecule or biologic drugs are currently known to target Robo receptors directly in the clinic, though their role in disease highlights ongoing research interest for therapeutic targeting[2][4].

Other names

RoboRoundabout receptorRobo1Robo2Robo3Robo4Roundabout gene family