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Multiple behavioral anomalies in GluR2 mutant mice exhibiting enhanced LTP
R Gerlai1, J T Henderson, J C Roder
1Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ont., Canada. gerlai@gene.com
Behavioural Brain Research
|October 1, 1998
Summary
Mice lacking the ionotropic glutamate receptor type 2 (GluR2) gene exhibit abnormal behaviors and impaired learning. This suggests GluR2 is crucial for normal brain function and cognitive processes.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- The ionotropic glutamate receptor type 2 (GluR2) plays a critical role in synaptic transmission.
- Previous studies generated GluR2-deficient mice, revealing enhanced hippocampal long-term potentiation and kainate-induced Ca2+ permeability.
Purpose of the Study:
- To investigate the behavioral and neuroanatomical consequences of GluR2 deficiency in homozygous null mutant mice.
- To understand the broader neurological impact of lacking the GluR2 gene product.
Main Methods:
- Gene targeting in embryonic stem cells to create GluR2 null mutant mice.
- Behavioral analyses including novel arena exploration, rotarod performance, and water maze tasks.
- Neuroanatomical assessment of gross brain morphology.
Main Results:
- GluR2-deficient mice displayed altered object exploration, rearing, grooming, and locomotion.
- Abnormalities were observed in eye-closure reflex, motor coordination, and spatial/non-spatial learning.
- Despite normal gross brain morphology, widespread behavioral deficits suggest broader neurological impact.
Conclusions:
- Absence of GluR2 leads to diverse neurological phenotypes affecting multiple brain regions, including the hippocampus, cortex, and cerebellum.
- GluR2 deficiency may result in generalized neuronal hyperexcitability, impacting cognitive functions.
- These findings highlight the essential role of GluR2 in regulating neuronal excitability and cognitive processes.