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Updated: Jul 28, 2025
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Surveying Low-Cost Methods to Measure Lifespan and Healthspan in Caenorhabditis elegans
Published on: May 18, 2022
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Long ant life span is maintained by a unique heat shock factor.
Karl M Glastad1,2, Julian Roessler3, Janko Gospocic1,2
1Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
Genes & Development
|May 31, 2023
Summary
In ants, reproductive females live longer by activating heat shock response genes. A specific heat shock factor (hsalHSF2) enhances survival and extends lifespan, even in flies.
Area of Science:
- Insect biology
- Genetics
- Aging research
Background:
- Eusocial insects exhibit caste-based lifespan differences despite genetic similarity.
- In the ant Harpegnathos saltator, worker to gamergate transition leads to a fivefold lifespan extension.
- The mechanisms driving this facultative lifespan extension are not well understood.
Purpose of the Study:
- To investigate the molecular mechanisms behind the extended lifespan of Harpegnathos saltator gamergates.
- To determine the role of heat shock response (HSR) genes and heat shock factor 2 (HSF2) in ant longevity.
- To explore the transferability of lifespan-extending mechanisms between species.
Main Methods:
- Comparative gene expression analysis between ant workers and gamergates.
- Chromatin immunoprecipitation to assess transcription factor binding.
- Functional studies involving gene expression in Drosophila melanogaster.
Main Results:
- Gamergates exhibit elevated expression of HSR genes and enhanced survival under heat stress.
- A truncated heat shock factor, hsalHSF2, is upregulated in gamergates and binds to HSR genes even without heat stress.
- Expression of hsalHSF2 in Drosophila melanogaster increased heat shock survival and extended lifespan.
Conclusions:
- Upregulation of hsalHSF2 and constitutive activation of HSR genes are key to gamergate longevity.
- hsalHSF2 mediates caste-specific heat stress resilience and facultative lifespan extension in ants.
- The conserved function of hsalHSF2 highlights the role of proteostasis in aging and suggests potential for interspecies transfer of longevity mechanisms.
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