Biodemographic trajectories of age-specific reproliferation from stationary phase in the yeast Saccharomyces cerevisiae seem multiphasic

被引:10
作者
Gendron, CM
Minois, N
Longo, VD
Pletcher, SD
Vaupel, JW
机构
[1] Max Planck Inst Demog Res, D-18057 Rostock, Germany
[2] Univ So Calif, Div Biogerontol, Ethel Percy Andrus Gerontol Ctr, Los Angeles, CA 90089 USA
[3] Baylor Coll Med, Huffington Ctr Aging & Mol & Human Genet, Houston, TX 77030 USA
关键词
biodemography; Saccharomyces cerevisiae; age-specific reproliferation rates; heterogeneity;
D O I
10.1016/j.mad.2003.08.003
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Ageing is usually seen as a monotonic decline of functions and survival. However, recent studies reported that age-specific mortality rates increased and then leveled off or even declined at later ages in several species including humans. Preliminary data using the yeast, Saccharomyces cerevisiae. demonstrated an even more complicated, non-monotonic pattern of reproliferation after stationary phase (i.e. the ability of a cell to exit stationary phase and form a colony). In the present article, we conducted a study of the age-specific reproliferation rates of yeast populations. Stationary phase yeast cells were maintained in water and the reproliferation rates were estimated by the number of yeast able to exit stationary phase on rich growth media. We showed that the age-specific reproliferation rates in yeast seem to rise, fall and rise again. Furthermore. we observed this pattern in different experiments and in different genotypes and established that this pattern was not due to genetic heterogeneity of the populations. (C) 2003 Elsevier Ireland Ltd. All rights reserved.
引用
收藏
页码:1059 / 1063
页数:5
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