Gradients of Cell Recognition Molecules Wire Visuomotor Transformation

Area of Science:

• Neuroscience
• Developmental Biology
• Molecular Biology

Background:

• Visuomotor transformations are crucial for action, with Visual Projection Neurons (VPNs) mediating these processes in *Drosophila*.
• A synaptic gradient mechanism underlies directional behaviors driven by VPNs, but the molecular basis of this graded connectivity is unknown.

Purpose of the Study:

• To investigate the molecular mechanisms regulating synaptic connectivity in the LPLC2 Visual Projection Neuron type.
• To identify the molecular players responsible for graded connectivity in visuomotor transformations.

Main Methods:

• Utilized *Drosophila* as a model organism.
• Employed behavioral, physiological, and molecular experiments.
• Investigated cell recognition molecules and their interactions.

Main Results:

• Identified dorsoventral expression gradients of cell recognition molecules (Dpr13 and Beat-VI) in LPLC2 neurons.
• Dpr13 interacts with DIP-ε to regulate LPLC2 synaptic outputs.
• Beat-VI interacts with Side-II to regulate LPLC2 synaptic inputs.
• Demonstrated that these molecular gradients are essential for accurate visuomotor transformation and escape responses.

Conclusions:

• Coordinated molecular gradients of cell recognition molecules regulate synaptic connectivity in LPLC2 neurons.
• This mechanism enables the precise transformation of visual motion into motor commands for escape.
• Graded expression of cell recognition molecules may be a conserved mechanism for synaptic specificity in neuronal circuits, potentially extending to mammals.