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Young dentate granule cells mediate pattern separation, whereas old granule cells facilitate pattern completion |
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| Authors: | Nakashiba Toshiaki Cushman Jesse D Pelkey Kenneth A Renaudineau Sophie Buhl Derek L McHugh Thomas J Rodriguez Barrera Vanessa Chittajallu Ramesh Iwamoto Keisuke S McBain Chris J Fanselow Michael S Tonegawa Susumu |
| Institution: | 1 Departments of Biology and Brain and Cognitive Sciences, RIKEN-MIT Center for Neural Circuit Genetics at The Picower Institute for Learning and Memory, Massachusetts Institute of Technology, Cambridge, MA 02139, USA 2 Department of Psychology, Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, Los Angeles, CA 90095, USA 3 Laboratory of Cellular and Synaptic Neurophysiology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA 4 Department of Radiation Oncology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA |
| Abstract: | Adult-born granule cells (GCs), a minor population of cells in the hippocampal dentate gyrus, are highly active during the first few weeks after functional integration into the neuronal network, distinguishing them from less active, older adult-born GCs and the major population of dentate GCs generated developmentally. To ascertain whether young and old GCs perform distinct memory functions, we created a transgenic mouse in which output of old GCs was specifically inhibited while leaving a substantial portion of young GCs intact. These mice exhibited enhanced or normal pattern separation between similar contexts, which was reduced following ablation of young GCs. Furthermore, these mutant mice exhibited deficits in rapid pattern completion. Therefore, pattern separation requires adult-born young GCs but not old GCs, and older GCs contribute to the rapid recall by pattern completion. Our data suggest that as adult-born GCs age, their function switches from pattern separation to rapid pattern completion. |
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