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Brief Report
p21Waf1/Cip1 Deficiency Stimulates Centriole Overduplication
Anette Duensing, Louis Ghanem, Richard A. Steinman, Ying Liu and Stefan Duensing
volume 5 | issue 24
15 december 2006Pages: 2899 - 2902
This is an open-access article
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Inactivation of the cyclin-dependent kinase (CDK) inhibitor p21Waf1/Cip1 (CDKN1; hereafter p21) has previously been implicated in the induction of numerical centrosome alterations. It is unclear, however, whether p21 deficiency deregulates the centrosome duplication cycle itself or causes an accumulation of centrosomes due to cell division failure and/or polyploidization. Using a novel marker for maternal centrioles, Cep170, we show here that knock-down of p21 protein expression in murine myeloblasts can stimulate excessive centriole numbers in the presence of only one or two mature centrioles. These results indicate that p21 deficiency can trigger a bona fide overduplication of centrioles and that aberrant centrosome numbers cannot solely be explained by polyploidization as suggested by previous studies. Our findings underscore that impaired p21 expression may function as a driving force for chromosomal instability and highlight the importance of markers for maternal centrioles such as Cep170 to elucidate the pathogenesis of numerical centriole aberrations in tumor cells.
Authors
Anette Duensing
University of Pittsburgh School of Medicine, Pittsburgh, PA
Louis Ghanem
University of Pittsburgh School of Medicine, Pittsburgh, PA
Richard A. Steinman
University of Pittsburgh School of Medicine, Pittsburgh, PA
Ying Liu
University of Pittsburgh School of Medicine
Stefan Duensing
University of Pittsburgh School of Medicine, Pittsburgh, PA
This is an open-access article
Download PDFIf the document does not open, please right-click on the link (control-click on a Macintosh) and select the option to save the file to disk.