This project is designed to reveal basic principles of olfactory system function and development, through a detailed analysis of the recently discovered DOR family of odorant receptor genes. The proposal addresses fundamental issues of receptor function, taking advantage of the strengths of Drosophila as an experimental system. Olfaction is an ancient sensory modality, and many principles of olfactory function and organization are well conserved among invertebrates and vertebrates. Moreover, understanding of insect olfaction may be useful in controlling insect vectors of human disease that find their human hosts or their mates through olfactory cues. The proposal aims first to identify and classify all members of the DOR gene family, including highly divergent members. Extant mutations affecting DOR genes will be sought. The distribution of receptors in the mature olfactory system will be addressed in two ways. First, the recent isolation of an antibody against a DOR protein allows a high-resolution analysis of receptor localization in the olfactory system. Results showing that the DOR22A.2 protein is present in the cavities of olfactory sensilla, as expected of an odorant receptor localized to dendrites, will be confirmed and extended by immunoelectron microscopy and with antibodies against additional DOR proteins. Second, the number of receptors per neuron will be investigated by double-label in situ hybridization. A developmental analysis of receptor expression is proposed. The developmental profiles of all DOR genes will be analyzed, with a view to determining how many genes are expressed early in development, as is DOR22A.2. Preliminary immunohistochemical results indicating that the DOR22A.2 receptor is present on the axons of olfactory receptor neurons will be confirmed and extended. A genetic analysis of selected DOR genes is proposed to test the hypothesis that they encode odorant receptors. DOR gene function will be altered through overexpression and by loss-of-function mutations. These experiments may identify a ligand for a DOR protein. They may also provide functional evidence regarding the number of receptors expressed per neurons, and the possibility of developmental roles for receptors.

Agency
National Institute of Health (NIH)
Institute
National Institute on Deafness and Other Communication Disorders (NIDCD)
Type
Research Project (R01)
Project #
1R01DC004729-01
Application #
6258545
Study Section
Special Emphasis Panel (ZRG1-MDCN-6 (01))
Program Officer
Davis, Barry
Project Start
2001-01-01
Project End
2005-12-31
Budget Start
2001-01-01
Budget End
2001-12-31
Support Year
1
Fiscal Year
2001
Total Cost
$371,686
Indirect Cost
Name
Yale University
Department
Physiology
Type
Schools of Arts and Sciences
DUNS #
082359691
City
New Haven
State
CT
Country
United States
Zip Code
06520
Sun, Jennifer S; Larter, Nikki K; Chahda, J Sebastian et al. (2018) Humidity response depends on the small soluble protein Obp59a in Drosophila. Elife 7:
Park, Joori; Carlson, John R (2018) Physiological responses of the Drosophila labellum to amino acids. J Neurogenet 32:27-36
He, Zhe; Carlson, John R (2017) Molecules That Can Rewire the Taste System. Biochemistry 56:6075-6076
Delventhal, R; Menuz, K; Joseph, R et al. (2017) The taste response to ammonia in Drosophila. Sci Rep 7:43754
Joseph, Ryan M; Sun, Jennifer S; Tam, Edric et al. (2017) A receptor and neuron that activate a circuit limiting sucrose consumption. Elife 6:
Delventhal, Rebecca; Carlson, John R (2016) Bitter taste receptors confer diverse functions to neurons. Elife 5:
Stewart, Shannon; Koh, Tong-Wey; Ghosh, Arpan C et al. (2015) Candidate ionotropic taste receptors in the Drosophila larva. Proc Natl Acad Sci U S A 112:4195-201
Joseph, Ryan M; Carlson, John R (2015) Drosophila Chemoreceptors: A Molecular Interface Between the Chemical World and the Brain. Trends Genet 31:683-695
Kwon, Jae Young; Dahanukar, Anupama; Weiss, Linnea A et al. (2014) A map of taste neuron projections in the Drosophila CNS. J Biosci 39:565-74
Koh, Tong-Wey; He, Zhe; Gorur-Shandilya, Srinivas et al. (2014) The Drosophila IR20a clade of ionotropic receptors are candidate taste and pheromone receptors. Neuron 83:850-65

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