This article is a US Government work and, as such, is in the public domain in the United States of America.
Neurogranin null mutant mice display performance deficits on spatial learning tasks with anxiety related components †
Article first published online: 1 NOV 2001
Copyright © 2001 Wiley-Liss, Inc.
Volume 11, Issue 6, pages 763–775, 2001
How to Cite
Miyakawa, T., Yared, E., Pak, J. H., Huang, F. L., Huang, K.-P. and Crawley, J. N. (2001), Neurogranin null mutant mice display performance deficits on spatial learning tasks with anxiety related components . Hippocampus, 11: 763–775. doi: 10.1002/hipo.1092
- Issue published online: 1 NOV 2001
- Article first published online: 1 NOV 2001
- Manuscript Accepted: 22 MAR 2001
- National Institute of Mental Health Intramural Research Program
- National Institute of Child Health and Human Development Intramural Research Program
- targeted gene mutation;
- Morris water maze;
- Barnes maze
Neurogranin/RC3 is a protein that binds calmodulin and serves as a substrate for protein kinase C. Neuronally distributed in the hippocampus and forebrain, neurogranin is highly expressed in dendritic spines of hippocampal pyramidal cells, implicating this protein in long-term potentiation and in learning and memory processes. Null mutation of the neurogranin gene Ng generated viable knockout mice for analysis of the behavioral phenotype resulting from the absence of neurogranin protein. Ng −/− mice were normal on measures of general health, neurological reflexes, sensory abilities, and motor functions, as compared to wild type littermate controls. On the Morris water task, Ng −/− mice failed to reach acquisition criterion on the hidden platform test and did not show selective search on the probe trial. In the Barnes circular maze, another test for spatial navigation learning, Ng −/− mice showed impairments on some components of transfer, but normal performance on time spent around the target hole. Abnormal and idiosyncratic behaviors were detected, that appeared to represent an anxiogenic phenotype in Ng −/− mice, as measured in the lightdark exploration test and the open field center time parameter. These findings of apparent deficits in spatial learning and anxiety-like tendencies in Ng −/− support a role for neurogranin in the hippocampally-mediated interaction between stress and performance. Hippocampus 2001;11:763–775. Published 2001 Wiley-Liss, Inc.