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A mother's sacrifice: what is she keeping for herself?
Kiersten A Henderson1, Daniel E Gottschling
1Division of Basic Sciences, Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue North, P.O. Box 19024, Seattle, WA 98109, USA.
Abstract:
Individual cells of the budding yeast, Saccharomyces cerevisiae, have a limited life span and undergo a form of senescence termed replicative aging. Replicative life span is defined as the number of daughter cells produced by a yeast mother cell before she ceases dividing. Replicative aging is asymmetric: a mother cell ages but the age of her daughter cells is 'reset' to zero. Thus, one or more senescence factors have been proposed to accumulate asymmetrically between mother and daughter yeast cells and lead to mother-specific replicative senescence once a crucial threshold has been reached. Here we evaluate potential candidates for senescence factors and age-associated phenotypes and discuss potential mechanisms underlying the asymmetry of replicative aging in budding yeast.
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