A Functionally Conserved Gene Regulatory Network Module Governing Olfactory Neuron Diversity.
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Sensory neuron diversity is required for organisms to decipher complex environmental cues. In Drosophila, the olfactory environment is detected by 50 different olfactory receptor neuron (ORN) classes that are clustered in combinations within distinct sensilla subtypes. Each sensilla subtype houses stereotypically clustered 1-4 ORN identities that arise through asymmetric divisions from a single multipotent sensory organ precursor (SOP). How each class of SOPs acquires a unique differentiation potential that accounts for ORN diversity is unknown. Previously, we reported a critical component of SOP diversification program, Rotund (Rn), increases ORN diversity by generating novel developmental trajectories from existing precursors within each independent sensilla type lineages. Here, we show that Rn, along with BarH1/H2 (Bar), Bric-à-brac (Bab), Apterous (Ap) and Dachshund (Dac), constitutes a transcription factor (TF) network that patterns the developing olfactory tissue. This network was previously shown to pattern the segmentation of the leg, which suggests that this network is functionally conserved. In antennal imaginal discs, precursors with diverse ORN differentiation potentials are selected from concentric rings defined by unique combinations of these TFs along the proximodistal axis of the developing antennal disc. The combinatorial code that demarcates each precursor field is set up by cross-regulatory interactions among different factors within the network. Modifications of this network lead to predictable changes in the diversity of sensilla subtypes and ORN pools. In light of our data, we propose a molecular map that defines each unique SOP fate. Our results highlight the importance of the early prepatterning gene regulatory network as a modulator of SOP and terminally differentiated ORN diversity. Finally, our model illustrates how conserved developmental strategies are used to generate neuronal diversity.
Gene Expression Regulation, Developmental
Gene Regulatory Networks
Olfactory Receptor Neurons
Published Version (Please cite this version)10.1371/journal.pgen.1005780
Publication InfoLi, Qingyun; Barish, Scott; Okuwa, Sumie; Maciejewski, Abigail; Brandt, Alicia T; Reinhold, Dominik; ... Volkan, Pelin Cayirlioglu (2016). A Functionally Conserved Gene Regulatory Network Module Governing Olfactory Neuron Diversity. PLoS Genet, 12(1). pp. e1005780. 10.1371/journal.pgen.1005780. Retrieved from https://hdl.handle.net/10161/13274.
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Associate Professor of Biology
The long-term goal in the lab is to understand the developmental processes that establish the basic organizational and functional principles of the neuronal circuits in the brain. We investigate how the neuronal circuits assemble, functionally mature, remodel in developmental and evolutionary time scales. To understand these processes the Volkan lab uses the olfactory system of the genetically tractable Drosophila melanogaster as a model organism and apply molecular, developmental and systems le