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Related Experiment Videos

Dietary restriction in Drosophila.

Linda Partridge1, Matthew D W Piper, William Mair

  • 1UCL Centre for Research on Ageing, Department of Biology, University College London, London WC1E 6BT, UK. l.partridge@ucl.ac.uk

Mechanisms of Ageing and Development
|June 7, 2005
PubMed
Summary

Dietary restriction (DR) extends lifespan in fruit flies by up to 50% through food dilution. This effect is rapid, greater in females, and involves nutrient-sensing pathways, offering a model for aging research.

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Area of Science:

  • Gerontology
  • Molecular Biology
  • Genetics

Background:

  • The fruit fly Drosophila is a valuable model organism for studying aging due to its short lifespan and well-understood biology.
  • Dietary restriction (DR) is known to extend lifespan across various species, but the underlying mechanisms require further elucidation.
  • Understanding how DR impacts lifespan in Drosophila can provide insights into conserved aging processes.

Purpose of the Study:

  • To investigate the effects of dietary restriction (DR) on lifespan and fecundity in the fruit fly Drosophila.
  • To explore the role of nutrient-sensing pathways and other molecular factors in mediating the lifespan-extending effects of DR.
  • To characterize the rapid action of DR on mortality rates in Drosophila.

Main Methods:

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  • Utilizing Drosophila melanogaster with varying degrees of food dilution to induce DR and starvation.
  • Conducting demographic analyses to measure mean and maximum lifespan, as well as daily and lifetime fecundity.
  • Examining the involvement of insulin/IGF-like and TOR pathways, and protein deacetylases (dSir2, Rpd3) in the DR response.
  • Assessing metabolic rate and mitochondrial superoxide/hydrogen peroxide generation.

    • Main Results:

    • Dietary restriction significantly extends both mean and maximum lifespan in Drosophila, with a greater effect observed in females.
    • Lifespan extension plateaus at a certain level of food dilution, beyond which starvation leads to decreased lifespan.
    • Female fecundity is reduced by DR, but lifespan extension occurs even in sterile females.
    • DR rapidly reduces mortality rates within 48 hours, irrespective of prior feeding status.

    Conclusions:

    • Dietary restriction is a potent lifespan-extending intervention in Drosophila, mediated by complex genetic and molecular pathways.
    • The rapid action of DR on mortality suggests acute molecular responses that can be further investigated.
    • Drosophila serves as an excellent model for dissecting the fundamental mechanisms of aging and lifespan regulation by DR.