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1 Stem Cell Research Institute, H. S. Raffaele, Via Olgettina 58, Milan, I-20132, Italy
2 Department of Biological and Technological Research (DIBIT), Istituto Scientifico H. San Raffaele, via Olgettina 58, Milan, I-20132, Italy
3 Department of Scienze Morfologiche e Medico Legali, University of Modena and Reggio Emilia, Via del Pozzo 71, Modena, I-41100, Italy
*Authors for correspondence (e-mail: galli.rossella{at}hsr.it and vescovi.angelo{at}hsr.it)
Accepted 9 January 2002
The appropriate control of proliferation of neural precursors has fundamental implications for the development of the central nervous system and for cell homeostasis/replacement within specific brain regions throughout adulthood. The role of genetic determinants in this process is largely unknown.
We report the expression of the homeobox transcription factor Emx2 within the periventricular region of the adult telencephalon. This neurogenetic area displays a large number of multipotent stem cells. Adult neural stem cells isolated from this region do express Emx2 and down-regulate it significantly upon differentiation into neurons and glia. Abolishing or, increasing Emx2 expression in adult neural stem cells greatly enhances or reduces their rate of proliferation, respectively. We determined that altering the expression of Emx2 affects neither the cell cycle length of adult neural stem cells nor their ability to generate neurons and glia. Rather, when Emx2 expression is abolished, the frequency of symmetric divisions that generate two stem cells increases, whereas it decreases when Emx2 expression is enhanced.
Key words: CNS stem cell, Emx2, Cell proliferation, Mouse
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