Neurons regulate synaptic activity by regulating the differentiation of the postsynaptic face of the synapse, including the amount of glutamate receptors that reach the postsynaptic surface. Do changes in glutamate receptor trafficking underlie behavioral plasticity, learning, and memory in the intact animal? The signaling molecules that regulate glutamate receptor localization need to be completely elucidated to address this question. C. elegans has been an excellent model system for studying glutamate receptors in vivo. The glutamate receptor subunit GLR-1 is required for glutamatergic signaling, and is localized to postsynaptic clusters between C. elegans neurons in a mechanosensory circuit. Using forward genetic screens, we have identified multiple genes that regulate the trafficking of GLR-1 to and from the synapse. One of these genes encodes a PDZ domain protein with orthologs in mammals, and mutations in this gene result in the failure of glutamatergic synapses to recover from habituation. Another of these genes encodes an ubiquitin ligase, and mutations in this gene result in the failure of GLR-1 receptors to be removed from the synapse. We propose three aims for understanding the role of these genes in regulating glutamatergic synapses in response to behavior. First, we will characterize changes in GLR-1 trafficking during habituation and recovery of the mechanosensory circuit. Second, we will characterize the molecular and cell biological function of the ubiquitin ligase with regard to its role in downregulating GLR-1 after habituation. Third, we will characterize the molecular and cell biological function of our PDZ domain protein with regard to its role in upregulating GLR-1 after recovery from habituation. The molecular and cell biological function of these new genes will provide clues to the mechanisms by which glutamate receptors are regulated.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
5R01NS042023-09
Application #
8089415
Study Section
Synapses, Cytoskeleton and Trafficking Study Section (SYN)
Program Officer
Talley, Edmund M
Project Start
2001-07-01
Project End
2013-12-31
Budget Start
2011-07-01
Budget End
2013-12-31
Support Year
9
Fiscal Year
2011
Total Cost
$317,740
Indirect Cost
Name
Rutgers University
Department
Type
Organized Research Units
DUNS #
001912864
City
New Brunswick
State
NJ
Country
United States
Zip Code
08901
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