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Extension of life duration by dietary ethanol in drosophila melanogaster response to selection in 2 strains of different origins

, : Extension of life duration by dietary ethanol in drosophila melanogaster response to selection in 2 strains of different origins. Genetica (Dordrecht) 63(1): 61-70

Lines homozygous for the AdhS and AdhF alleles were extracted from a French and an African natural population of D. melanogaster. The lines from each geographic region were then crossed and the Medelian F2 constituted the 1st generation subjected to selection for an increase in adult survival in the presence of 2% ethanol. The responses to selection were similar in the 2 strains, in spite of their different ethanol tolerance. In < 10 generations, life span with ethanol increased from .apprx. 7 to > 12 days, with realized heritabilities of 0.14 and 0.18. This extension of longevity was also observed with other concentrations of ethanol but not with water alone. The increase in life span in presence of alcohol appears to result from unknown metabolic processes, which are not obligatorily related to the capacity of the flies to tolerate starvation, nor to their size, their lipid content or their ethanol tolerance. In the 2 lines the AdhS allele was quickly eliminated, suggesting a selective advantage for the F allele.

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