The broad long-term objective of this research is to determine the molecular mechanisms underlying detection of volatile odorants and pheromones in Drosophila melanogaster. This work is significant because insects transmit devastating diseases to humans and they use olfaction to find hosts and mates. Understanding these mechanisms will facilitate new approaches for its disruption. Drosophila is an excellent model system to reveal mechanisms underlying olfaction due to its wealth of genetic tools, including unbiased genetics screens. We recently found lipid translocation, mediated by the phosphatidylserine (PS) flippase dATP8B, is essential for normal odorant sensitivity. We are now leveraging this discovery to identify the components and pathways underlying lipid translocation and its relation to odorant sensitivity. This work represents a new path of investigation. Using a genetic screen, we identified a protein kinase C that genetically interacts with dATP8B and appears to transduce most of the effects of PS localization. We propose experiments to decipher how this kinase impacts olfaction.
Aim 1 is to explore the role of PKC98E in olfaction by characterizing its localization in olfactory neurons, and evaluating the phenotype of null and dominant alleles to analyze the olfactory consequences.
Aim 2 explores the role of conserved PKC phosphorylation sites in ORCO on olfactory sensitivity and receptor trafficking, and whether phosphorylation is odorant-dependent in vivo.
Aim 3 is to identify additional components involved in this process from a pool of 35 pre-selected candidates to gain a more complete understanding of this mechanism. Successful completion of these aims will significantly advance our understanding of insect olfaction and may provide exciting insights into the role of lipid translocation in modulating olfactory signal transduction.

Public Health Relevance

Arthropods transmit human diseases that produce significant human mortality and morbidity, and these disease vectors find their human hosts and mates using olfaction. A detailed understanding of how the insect olfactory system functions will lead to new approaches to disrupt mating and host seeking that are less harmful on the environment than current approaches. We recently discovered that lipid translocation plays a key role in olfactory sensitivity. The work proposed here seeks to advance our understanding of this phenomenon.

National Institute of Health (NIH)
National Institute on Deafness and Other Communication Disorders (NIDCD)
Research Project (R01)
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Somatosensory and Chemosensory Systems Study Section (SCS)
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Sullivan, Susan L
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University of Texas Sw Medical Center Dallas
Schools of Medicine
United States
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Guo, Hao; Kunwar, Kishor; Smith, Dean (2017) Odorant Receptor Sensitivity Modulation in Drosophila. J Neurosci 37:9465-9473
Guo, Hao; Smith, Dean P (2017) Odorant Receptor Desensitization in Insects. J Exp Neurosci 11:1179069517748600
Pitts, Svetlana; Pelser, Elizabeth; Meeks, Julian et al. (2016) Odorant Responses and Courtship Behaviors Influenced by at4 Neurons in Drosophila. PLoS One 11:e0162761
You, Yinwei; Smith, Dean P; Lv, Mingyue et al. (2016) A broadly tuned odorant receptor in neurons of trichoid sensilla in locust, Locusta migratoria. Insect Biochem Mol Biol :
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Ha, Tal Soo; Xia, Ruohan; Zhang, Haiying et al. (2014) Lipid flippase modulates olfactory receptor expression and odorant sensitivity in Drosophila. Proc Natl Acad Sci U S A 111:7831-6
Ronderos, David S; Lin, Chun-Chieh; Potter, Christopher J et al. (2014) Farnesol-detecting olfactory neurons in Drosophila. J Neurosci 34:3959-68
Lvovskaya, Svetlana; Smith, Dean P (2013) A spoonful of bitter helps the sugar response go down. Neuron 79:612-4
Li, Qingyun; Ha, Tal Soo; Okuwa, Sumie et al. (2013) Combinatorial rules of precursor specification underlying olfactory neuron diversity. Curr Biol 23:2481-90