48-Hour and 24-Hour Time-lapse Single-nucleus Transcriptomics Reveal Cell-type specific Circadian Rhythms in...

Area of Science:

• Plant Biology
• Chronobiology
• Genomics

Background:

• A functional circadian clock is essential for organismal adaptation and survival.
• Comprehensive single-cell profiling of circadian gene expression in plants remains largely unexplored due to technical challenges.

Purpose of the Study:

• To characterize plant circadian rhythms at the single-cell level.
• To identify cell-type specific rhythmic gene expression patterns.
• To discover novel circadian regulators in plants.

Main Methods:

• Employed time-lapse single-nucleus RNA sequencing (snRNA-seq) on Arabidopsis seedlings over 48-hour and 24-hour windows.
• Collected over 77,000 and 130,000 nuclei for high-resolution temporal analysis.
• Analyzed rhythmic gene expression patterns across distinct cell types.

Main Results:

• Identified four coherent rhythmic cell clusters in the shoot.
• Discovered approximately 3000 genes with cell-type specific rhythmic expression.
• Found core clock genes oscillating in multiple cell types and identified ABF1 as a novel circadian regulator that shortens the circadian period upon overexpression.

Conclusions:

• The study provides a comprehensive single-cell resource for plant circadian rhythms.
• Circadian clock gene expression is dynamic and cell-type specific in plants.
• ABF1 is a newly identified regulator of the plant circadian clock.