NMDA receptors mediate olfactory learning and memory in Drosophila

Xia, S., Miyashita, T., Fu, T. F., Lin, W. Y., Wu, C. L., Pyzocha, L., Lin, I. R., Saitoe, M., Tully, T., Chiang, A. S. (April 2005) NMDA receptors mediate olfactory learning and memory in Drosophila. Curr Biol, 15 (7). pp. 603-15. ISSN 0960-9822 (Print)

DOI: 10.1016/j.cub.2005.02.059

Abstract

BACKGROUND: Molecular and electrophysiological properties of NMDARs suggest that they may be the Hebbian "coincidence detectors" hypothesized to underlie associative learning. Because of the nonspecificity of drugs that modulate NMDAR function or the relatively chronic genetic manipulations of various NMDAR subunits from mammalian studies, conclusive evidence for such an acute role for NMDARs in adult behavioral plasticity, however, is lacking. Moreover, a role for NMDARs in memory consolidation remains controversial. RESULTS: The Drosophila genome encodes two NMDAR homologs, dNR1 and dNR2. When coexpressed in Xenopus oocytes or Drosophila S2 cells, dNR1 and dNR2 form functional NMDARs with several of the distinguishing molecular properties observed for vertebrate NMDARs, including voltage/Mg(2+)-dependent activation by glutamate. Both proteins are weakly expressed throughout the entire brain but show preferential expression in several neurons surrounding the dendritic region of the mushroom bodies. Hypomorphic mutations of the essential dNR1 gene disrupt olfactory learning, and this learning defect is rescued with wild-type transgenes. Importantly, we show that Pavlovian learning is disrupted in adults within 15 hr after transient induction of a dNR1 antisense RNA transgene. Extended training is sufficient to overcome this initial learning defect, but long-term memory (LTM) specifically is abolished under these training conditions. CONCLUSIONS: Our study uses a combination of molecular-genetic tools to (1) generate genomic mutations of the dNR1 gene, (2) rescue the accompanying learning deficit with a dNR1+ transgene, and (3) rapidly and transiently knockdown dNR1+ expression in adults, thereby demonstrating an evolutionarily conserved role for the acute involvement of NMDARs in associative learning and memory.

Item Type: Paper
Uncontrolled Keywords: Amino Acid Sequence Animals Association Learning physiology Base Sequence Cells Cultured Cloning Molecular Drosophila melanogaster genetics physiology Immunohistochemistry Memory physiology Molecular Sequence Data Mushroom Bodies metabolism Mutation genetics Receptors N-Methyl-D-Aspartate genetics metabolism Sequence Analysis DNA Smell genetics physiology Transgenes genetics Xenopus
Subjects: organism description > animal > insect > Drosophila
organs, tissues, organelles, cell types and functions > organs types and functions > brain
Investigative techniques and equipment > electrophysiology
organism description > animal > Frog > xenopus
CSHL Authors:
Depositing User: CSHL Librarian
Date: 12 April 2005
Date Deposited: 21 Dec 2011 17:01
Last Modified: 21 Dec 2011 17:01
URI: http://repository.cshl.edu/id/eprint/22736

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