A demographic analysis of the fitness cost of extended longevity in Caenorhabditis elegans.

Authors: Chen J; Senturk D; Wang JL; Müller HG; Carey JR; Caswell H; Caswell-Chen EP

Abstract: We monitored survival and reproduction of 1000 individuals of Caenorhabditis elegans wild type (N2) and 800 individuals of clk-1 and daf-2, and used biodemographic analysis to address fitness as the integrative consequence of the entire age-specific schedules of survival and reproduction. Relative to N2, the mutants clk-1 and daf-2 extended average life span by 27% and 111%, respectively, but reduced net reproductive rate by 44% and 18%. The net result of differences in survival and fertility was a significant differential in fitness, with both clk-1 (lambda = 2.74) and daf-2 (lambda = 3.78) at a disadvantage relative to N2 (lambda = 3.85). Demographic life table response experiment (LTRE) analysis revealed that the fitness differentials were due to negative effects in mutants on reproduction in the first 6-7 days of life. Fitness costs in clk-1 and daf-2 of C. elegans are consistent with the theory of antagonistic pleiotropy for the evolution of senescence.

Keywords: Aging; Animals; Caenorhabditis elegans/genetics/growth & development/*physiology; Caenorhabditis elegans Proteins; *Longevity; Mathematical Computing; Models, Animal; Mutation; Receptor, Insulin; Reproduction; Survival Analysis
Journal: The journals of gerontology. Series A, Biological sciences and medical sciences
Volume: 62
Issue: 2
Pages: 126-35
Date: March 7, 2007
PMID: 17339638
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Citation:

Chen J, Senturk D, Wang JL, Müller HG, Carey JR, Caswell H, Caswell-Chen EP (2007) A demographic analysis of the fitness cost of extended longevity in Caenorhabditis elegans. The journals of gerontology. Series A, Biological sciences and medical sciences 62: 126-35.


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