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Molecular and Cellular Biology, December 2005, p. 10286-10300, Vol. 25, No. 23
0270-7306/05/$08.00+0     doi:10.1128/MCB.25.23.10286-10300.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

The Neuroplasticity-Associated Arc Gene Is a Direct Transcriptional Target of Early Growth Response (Egr) Transcription Factors

Lin Li,1,{dagger} John Carter,1,{dagger} Xiaoguang Gao,1 Jennifer Whitehead,1 and Warren G. Tourtellotte1,2,3*

Departments of Pathology (Neuropathology),1 Neurology,2 The Institute for Neuroscience, Northwestern University, Chicago, Illinois 606113

Received 3 August 2005/ Accepted 2 September 2005

Early growth response (Egr) transcription factors (Egr1 to Egr4) are synaptic activity-inducible immediate early genes (IEGs) that regulate some aspects of synaptic plasticity-related to learning and memory, yet the target genes regulated by them are unknown. In particular, Egr1 is essential for persistence of late-phase long-term potentiation (L-LTP), for hippocampus-dependent long-term memory formation, and for reconsolidation of previously established memories. Here, we show that Egr1 and Egr3 directly regulate the plasticity-associated activity-regulated cytoskeletal-related (Arc) gene, a synaptic activity-induced effector molecule which is also required for L-LTP and hippocampus-dependent learning and memory processing. Moreover, Egr1-deficient and Egr3-deficient mice lack Arc protein in a subpopulation of neurons, while mice lacking both Egr1 and Egr3 lack Arc in all neurons. Thus, Egr1 and Egr3 can indirectly modulate synaptic plasticity by directly regulating Arc and the plasticity mechanisms it mediates in recently activated synapses.

* Corresponding author. Mailing address: Ward 7-110, Department of Pathology, W127, Northwestern University, 393 E. Chicago Ave., Chicago, IL 60611. Phone: (312) 503-2415. Fax: (312) 503-2459. E-mail: warren{at}northwestern.edu.

{dagger} These authors contributed equally to this work.

Molecular and Cellular Biology, December 2005, p. 10286-10300, Vol. 25, No. 23
0022-538X/05/$08.00+0     doi:10.1128/MCB.25.23.10286-10300.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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