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Circadian Rhythms and Gene Regulation

Circadian Rhythms and Gene Regulation

The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...

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Assaying Locomotor Activity to Study Circadian Rhythms and Sleep Parameters in Drosophila

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Published on: September 28, 2010

Deciphering a Beetle Clock: Individual and Sex-Dependent Variation in Daily Activity Patterns.

Reshma R¹, Tobias Prüser¹, Nora K E Schulz¹

¹Institute for Evolution and Biodiversity, University of Münster, Münster, Germany.

Journal of Biological Rhythms

|July 31, 2024

Summary

The red flour beetle, Tribolium castaneum, possesses a circadian clock regulating daily activity. This study reveals significant individual variations in their rhythms, particularly between males and females.

Keywords:

Clock RNAi circadian rhythm cryptozoic diurnal individual variation light entrainment locomotor activity patterns temperature entrainment

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Last Updated: Jun 18, 2025

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Area of Science:

Chronobiology
Insect Physiology
Behavioral Ecology

Background:

Circadian clocks, regulated by clock genes, govern daily rhythms in most organisms.
The red flour beetle (Tribolium castaneum) is a globally significant stored grain pest whose activity patterns are not fully understood.

Purpose of the Study:

To investigate the circadian behaviors of Tribolium castaneum.
To determine the influence of light and temperature cues on beetle activity.
To explore the role of the Clock gene in regulating these rhythms.

Main Methods:

Observing locomotor activity patterns under different light and temperature conditions.
Utilizing RNA interference (RNAi) to target the Clock gene.
Comparing rhythmic behaviors between male and female beetles.

Main Results:

Tribolium castaneum exhibits distinct daily activity patterns, with reduced morning and increased evening activity.
Locomotor activity rhythms persist under constant dark and constant light, though less robustly.
RNA interference targeting the Clock gene diminished activity rhythms.
Males displayed more robust rhythms than females, with greater individual variation.

Conclusions:

Circadian clocks and clock-controlled behaviors exist in Tribolium castaneum.
Individual variation in circadian activity is substantial and warrants further ecological and evolutionary investigation.