Metabolic basis of the astrocyte-synapse interaction governs dopaminergic-motor connection

Perisynaptic astrocyte processes are constitutive attachments of synapses in the central nervous system. However, the molecular mechanisms that control perisynaptic astrocyte ensheathment and their implications in the wiring of neural circuits remain unclear. Here, we report that glycolysis controls astrocyte-synapse contact. In the Drosophila larval dopaminergic (DAergic) circuit, blocking astrocyte glycolysis stimulated perisynaptic ensheathment by attenuating astrocyte-to-DAergic neuron neuroligin 2-neurexin 1 signaling. As a result, the larvae executed more reorientation actions during locomotion. At the circuit level, behavioral alterations were found to arise from increased DAergic neuronal synaptogenesis and DAergic-motor connection. Our research uncovers an ancient metabolic basis that determines perisynaptic astrocyte ensheathment abundance through a conserved neuroligin-neurexin signaling pathway and demonstrates the role of astrocyte glycolysis in controlling DAergic-motor circuit assembly and function.