Publication Date:
1995-03-03
Description:
Cell cycle checkpoints enhance genetic fidelity by causing arrest at specific stages of the cell cycle when previous events have not been completed. The tumor suppressor p53 has been implicated in a G1 checkpoint. To investigate whether p53 also participates in a mitotic checkpoint, cultured fibroblasts from p53-deficient mouse embryos were exposed to spindle inhibitors. The fibroblasts underwent multiple rounds of DNA synthesis without completing chromosome segregation, thus forming tetraploid and octaploid cells. Deficiency of p53 was also associated with the development of tetraploidy in vivo. These results suggest that murine p53 is a component of a spindle checkpoint that ensures the maintenance of diploidy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cross, S M -- Sanchez, C A -- Morgan, C A -- Schimke, M K -- Ramel, S -- Idzerda, R L -- Raskind, W H -- Reid, B J -- R01CA55814/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1995 Mar 3;267(5202):1353-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, University of Washington, Seattle 98195.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7871434" target="_blank"〉PubMed〈/a〉
Keywords:
Animals
;
Cell Cycle
;
Cells, Cultured
;
DNA/biosynthesis
;
Demecolcine/pharmacology
;
Diploidy
;
Female
;
Genes, p53
;
Male
;
Mice
;
*Mitosis
;
Nocodazole/pharmacology
;
Ploidies
;
Spindle Apparatus/*physiology
;
Tumor Suppressor Protein p53/*physiology
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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