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First published online February 2, 2006
Stem Cells Vol. 24 No. 5 May 2006, pp. 1143 -1149
doi:10.1634/stemcells.2005-0345; www.StemCells.com
© 2006 AlphaMed Press

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STEM CELL GENETICS AND GENOMICS: CONCISE REVIEW

Cellular Memory and Hematopoietic Stem Cell Aging

Leonie M. Kamminga, Gerald de Haan

Department of Cell Biology, Section Stem Cell Biology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands

Key Words. Epigenetics • Chromatin • Aging • Cellular memory • Stem cells

Correspondence: Gerald de Haan, Ph.D., Department of Cell Biology, Section Stem Cell Biology, University Medical Center Groningen, University of Groningen, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands. Telephone: +31 50 3632722; Fax: +31 50 3637477; e-mail: g.de.haan{at}med.umcg.nl

Received July 28, 2005; accepted for publication January 23, 2006.
Hematopoietic stem cells (HSCs) balance self-renewal and differentiation in order to sustain lifelong blood production and simultaneously maintain the HSC pool. However, there is clear evidence that HSCs are subject to quantitative and qualitative exhaustion. In this review, we briefly discuss several known aspects of the stem cell aging process, including DNA damage, telomere shortening, and oxidative stress. Besides these known players, there is increasing evidence that higher order chromatin structure, largely defined by the histone code and affecting transcriptional activity, is important. A model is suggested which describes how epigenetic regulation of gene transcription by modulation of the chromatin structure in stem cells can account for regulation of the aging program.




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