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First published online 21 July 2004
doi: 10.1242/dev.01215

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Telomere shortening and chromosomal instability abrogates proliferation of adult but not embryonic neural stem cells

Sacri Ferrón^1,*, Helena Mira^1,*,, Sonia Franco^2,*, Marifé Cano-Jaimez¹, Elena Bellmunt¹, Carmen Ramírez¹, Isabel Fariñas^1, and María A. Blasco²

¹ Departamento de Biología Celular, Universidad de Valencia, 46100 Burjassot, Spain
² Spanish National Cancer Center (CNIO), 28029 Madrid, Spain

Author for correspondence (e-mail: isabel.farinas{at}uv.es)

Accepted 8 April 2004

Chromosome integrity is essential for cell viability and, therefore, highly proliferative cell types require active telomere elongation mechanisms to grow indefinitely. Consistently, deletion of telomerase activity in a genetically modified mouse strain results in growth impairments in all highly proliferative cell populations analyzed so far. We show that telomere attrition dramatically impairs the in vitro proliferation of adult neural stem cells (NSCs) isolated from the subventricular zone (SVZ) of telomerase-deficient adult mice. Reduced proliferation of postnatal neurogenic progenitors was also observed in vivo, in the absence of exogenous mitogenic stimulation. Strikingly, severe telomere erosion resulting in chromosomal abnormalities and nuclear accumulation of p53 did not affect the in vitro proliferative potential of embryonic NSCs. These results suggest that intrinsic differences exist between embryonic and adult neural progenitor cells in their response to telomere shortening, and that some populations of tissue-specific stem cells can bypass DNA damage check points.

Key words: Telomerase knockout, Neural progenitor, Neurogenesis, Differentiation

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