10779/crick.12497969.v1
Holger Apitz
Holger
Apitz
Iris Salecker
Iris
Salecker
Spatio-temporal relays control layer identity of direction-selective neuron subtypes in Drosophila
The Francis Crick Institute
2020
Alleles
Animals
Axons
Drosophila Proteins
Drosophila melanogaster
Female
Gene Expression Regulation, Developmental
Male
Motion Perception
Nerve Tissue Proteins
Neurons
Nuclear Proteins
Protein Domains
RNA Interference
Signal Transduction
T-Box Domain Proteins
Vision, Ocular
Wings, Animal
Wnt1 Protein
Salecker FC001151
2020-06-25 15:16:20
Journal contribution
https://crick.figshare.com/articles/journal_contribution/Spatio-temporal_relays_control_layer_identity_of_direction-selective_neuron_subtypes_in_Drosophila/12497969
Visual motion detection in sighted animals is essential to guide behavioral actions ensuring their survival. In Drosophila, motion direction is first detected by T4/T5 neurons. Their axons innervate one of the four lobula plate layers. How T4/T5 neurons with layer-specific representation of motion-direction preferences are specified during development is unknown. We show that diffusible Wingless (Wg) between adjacent neuroepithelia induces its own expression to form secondary signaling centers. These activate Decapentaplegic (Dpp) signaling in adjacent lateral tertiary neuroepithelial domains dedicated to producing layer 3/4-specific T4/T5 neurons. T4/T5 neurons derived from the core domain devoid of Dpp signaling adopt the default layer 1/2 fate. Dpp signaling induces the expression of the T-box transcription factor Optomotor-blind (Omb), serving as a relay to postmitotic neurons. Omb-mediated repression of Dachshund transforms layer 1/2- into layer 3/4-specific neurons. Hence, spatio-temporal relay mechanisms, bridging the distances between neuroepithelial domains and their postmitotic progeny, implement T4/T5 neuron-subtype identity.