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Transgenerational memory effect of ageing in Drosophila
1Laboratoire Evolution, Génomes et Spéciation, UPR 9034, CNRS, Avenue de la Terrasse, Gif sur Yvette, France.
Journal of Evolutionary Biology
|February 13, 2010
Summary
Parental age negatively impacts offspring intelligence and increases disease risk. This study shows older parents cause memory impairment in fruit fly offspring, linked to oxidative stress.
Area of Science:
- Evolutionary biology
- Genetics
- Neuroscience
Background:
- Parental age is linked to offspring health issues, including lower intelligence and increased risk for neurodevelopmental disorders like autism and schizophrenia.
- The evolutionary implications of age-related damage passed from parents to offspring are under-explored.
- Understanding these transgenerational effects is crucial for evolutionary theory and reproductive health.
Purpose of the Study:
- To investigate the impact of parental age on offspring cognitive function, specifically memory, in a model organism.
- To determine if parental age-related cognitive deficits are heritable and passed to subsequent generations.
- To identify potential underlying mechanisms, such as oxidative stress, contributing to these effects.
Main Methods:
- Utilized Drosophila melanogaster (fruit fly) as a model system to study parental age effects.
- Quantified memory impairment in offspring of young versus old parents.
- Assessed the heritability of memory impairment by examining the F2 generation.
- Investigated the role of oxidative stress by comparing memory function in offspring from lines selected for oxidative stress resistance.
Main Results:
- Offspring of older parents exhibited a significant 25% impairment in short-term memory.
- This memory impairment was heritable, affecting the F2 generation.
- The deficit was specific to memory and not a general decline in offspring health or condition.
- Lines of fruit flies selected for resistance to oxidative stress did not show memory impairment in offspring of old parents, implicating oxidative stress.
Conclusions:
- Parental age significantly impairs offspring short-term memory in Drosophila, with effects extending to the F2 generation.
- Oxidative stress is identified as a key causal factor in parental age-related memory impairment.
- These findings bridge mechanistic studies of aging with evolutionary perspectives on offspring fitness and transgenerational inheritance.
