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Related Experiment Video

Updated: Jan 29, 2026

Time-lapse Microscopy of Early Embryogenesis in Caenorhabditis elegans

Time-lapse Microscopy of Early Embryogenesis in Caenorhabditis elegans

Published on: August 25, 2011

Quantum-like decreased embryogenesis time with increased cold exposure time.

Tarushika Vasanthan^1,2, Joshua P Nederveen³, Jonathon Stone^4,5

¹Department of Biology, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4K1, Canada.

Scientific Reports

|February 6, 2019

Summary

Tardigrades exposed to cold temperatures show delayed embryonic development, indicating their biological age is less than chronological age. This suggests a unique energetic system controls tardigrade embryogenesis.

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Area of Science:

Zoology
Developmental Biology
Cryobiology

Background:

Theoretical models propose dormancy, continued aging, or slowed aging to explain lifespan extension in microscopic animals under extreme conditions.
Tardigrades are known for their resilience to extreme environments, including cold.

Purpose of the Study:

To investigate the effect of cold exposure on the embryonic development and aging of tardigrades.
To test the hypothesis that tardigrades may age at a diminished rate or stop aging under cold stress.

Main Methods:

Tardigrade eggs (Hypsibius dujardini) were reared at 0°C and then returned to 22°C.
Embryonic development and hatching times were compared to control groups reared at a constant 22°C.
Cold exposure durations varied (4, 10, 20, 40 days) to assess dose-dependent effects.

Main Results:

Cold exposure at 0°C retarded embryonic cell divisions in tardigrades.
Juveniles from eggs exposed to 4 days of cold showed a 3-day lag in development at 22°C, indicating reduced biological age.
Increased cold exposure duration led to incrementally shorter incubation periods upon return to optimal temperatures, suggesting a threshold-based control system.

Conclusions:

Tardigrade embryonic development is significantly influenced by cold exposure, leading to a measurable lag in biological age.
The observed response suggests a threshold-determined, energetic-based system regulates tardigrade embryogenesis, potentially contributing to their survival strategies.