Optimised Ribosome Profiling Reveals New Insights Into Translational Regulation in Synchronised Chlamydomonas...

Area of Science:

• Molecular Biology
• Genomics
• Algal Research

Background:

• Ribosome profiling (Ribo-seq) is crucial for understanding mRNA translation and the translatome.
• Optimized Ribo-seq protocols are needed for specific model organisms like Chlamydomonas reinhardtii.
• Previous methods had limitations in mapping efficiency and bias.

Purpose of the Study:

• To develop and validate an optimized Ribo-seq protocol and analysis pipeline for Chlamydomonas.
• To investigate translational regulation of gene expression during the diurnal cycle in Chlamydomonas.
• To identify novel regulatory elements like upstream open reading frames (uORFs) in the Chlamydomonas translatome.

Main Methods:

• Developed an optimized Ribo-seq protocol for Chlamydomonas reinhardtii.
• Utilized deep sequencing to analyze ribosome-protected fragments.
• Integrated Ribo-seq with RNA-seq for comparative transcriptomic and translatomic analysis.
• Applied bioinformatics pipeline for improved mapping rates and footprint periodicity analysis.

Main Results:

• The optimized protocol yielded high mapping rates and 3-nt periodicity of ribosome footprints.
• Identified significant enhancement of translation efficiency for core cell cycle genes during the S/M stage.
• Discovered differentially regulated upstream open reading frames (uORFs) potentially involved in diurnal regulation.
• Generated a high-quality Ribo-seq dataset for Chlamydomonas genomics.

Conclusions:

• Translational regulation plays a significant role in cell cycle control in Chlamydomonas.
• Upstream open reading frames (uORFs) are regulated and may contribute to diurnal responses.
• The optimized Ribo-seq protocol provides a valuable resource for Chlamydomonas research and translatome analysis.