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Related Experiment Video

Updated: Oct 27, 2025

Analysis of Circadian Photoresponses in Drosophila Using Locomotor Activity

Analysis of Circadian Photoresponses in Drosophila Using Locomotor Activity

Genomic heterogeneity affects the response to Daylight Saving Time.

Jonathan Tyler^1,2, Yu Fang³, Cathy Goldstein⁴

¹Department of Mathematics, University of Michigan, Ann Arbor, MI, 48109, USA.

Scientific Reports

|July 21, 2021

Summary

Genetic differences impact how quickly individuals adjust their internal body clocks to abrupt time changes like daylight saving time. Morning-inclined people adapt faster than evening-inclined individuals, affecting jet lag and shift work resilience.

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Area of Science:

Chronobiology
Human Physiology
Genetics

Background:

Circadian clocks regulate daily physiological rhythms.
Abrupt external time shifts cause circadian misalignment, leading to health issues.
Individual differences in adapting to circadian misalignment are not well understood.

Purpose of the Study:

To investigate how genetic variation influences adaptation to abrupt external time shifts.
To utilize the daylight saving time (DST) transition as a natural experiment.

Main Methods:

Studied sleep/wake cycle shifts in response to a one-hour DST advance.
Examined individual heterogeneity in adaptation to the time change.

Main Results:

Individuals with a genetic morning tendency adjusted their circadian clocks within days.
Individuals with a genetic evening tendency showed minimal adjustment after the one-hour shift.
Significant differences in adaptation based on genetic predisposition were observed.

Conclusions:

Genetic factors play a crucial role in an individual's ability to adjust to circadian rhythm disruptions.
Understanding these genetic differences is vital for managing issues like jet lag and shift work.
Individual heterogeneity in circadian adaptation has significant health implications.