Differences in locomotor activity across the lifespan of Drosophila melanogaster

The identification of differential patterns of change across the lifespan i n quantitative traits is of abiding interest in the biological and gerontol ogical research communities. These differential phenotypic patterns in comp lex systems illuminate developmental processes and form the foundation for the identification of putative biomarkers of aging. The goal of the present study was to explore changes in locomotor activity through the lifespan of Drosophila melanogaster. A replicated serial cross-sectional sampling desi gn was used to test activity in five genetically independent inbred strains at 7, 14, 21, 28, 35, and 42 days of age. Differences were observed in act ivity level across ages and strains, suggesting that patterns of activity t hroughout the lifespan of D. melanogaster are influenced by genetic factors . Observed sex differences in change in activity level indicate that the ag ing processes may proceed differently in males and females. (C) 1999 Elsevi er Science Inc. All rights reserved.