Journal of visualized experiments : JoVESep 4, 2026

Daily Rhythm Patterns in Lab-Grown Mouse Brain Cells Used to Study Internal Clock Genes

Circadian Biology Weekly Brief ↗PubMed ↗DOI ↗

Updated Sep 5, 2026

Abstract

A standardized protocol for synchronizing cultured cells over 24-72 hours improves the reliability of circadian rhythm analysis.

Circadian rhythms are internal cycles that regulate various biological processes, including metabolism and gene expression.
Minor experimental variations can significantly affect the phase, amplitude, and rhythmicity of circadian rhythms.
The proposed workflow includes synchronization methods, time-course sampling, and rigorous data analysis for studying circadian gene expression.
Key considerations for improving reproducibility include synchronization conditions, quality assessment of samples, and selection of reference genes.
This method aids in investigating molecular mechanisms of circadian rhythms in both healthy and disease-related contexts.

Simplified

Circadian rhythms are endogenous oscillations of approximately 24 h that regulate a wide range of cellular and physiological processes, including gene expression, metabolism, and behavior. These rhythms arise from interconnected transcriptional-translational feedback loops that respond to temporal and environmental cues. Because circadian regulation is highly dynamic, even minor experimental variations can influence phase, amplitude, and rhythmicity, making standardized experimental workflows essential for generating reliable and reproducible results. The goal of the present protocol is to provide a practical and reproducible workflow for synchronizing cultured cells, performing time-course sampling, and analyzing circadian clock gene expression under standard laboratory conditions. The protocol describes serum shock-based synchronization, staggered sample collection over 24-72 h to avoid overnight sampling, ribonucleic acid extraction, complementary deoxyribonucleic acid synthesis, quantitative real-time polymerase chain reaction, and circadian rhythm analysis using appropriate statistical approaches. The workflow also highlights critical experimental considerations, including synchronization conditions, sample quality assessment, reference gene selection, and data analysis, to improve reproducibility across experiments. This method provides an accessible approach for investigating molecular circadian mechanisms and evaluating rhythmic gene expression in cultured cells, facilitating studies of circadian regulation in physiological and disease-related experimental models.

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Daily Rhythm Patterns in Lab-Grown Mouse Brain Cells Used to Study Internal Clock Genes

Abstract

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