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The Landscape of tRNA Modifications in Archaea
Jesse S Leavitt1, Henry Moore1, Thomas J Santangelo2
1Department of Biomolecular Engineering, Baskin School of Engineering, University of California Santa Cruz, Santa Cruz, CA 95064, USA.
Biorxiv : the Preprint Server for Biology
|July 14, 2025
Summary
Transfer RNA (tRNA) modifications are crucial for cellular function. This study reveals coordinated and clade-specific tRNA modification patterns in archaea, linked to evolutionary enzyme changes.
Area of Science:
- Molecular Biology
- Evolutionary Biology
- Genomics
Background:
- Transfer RNA (tRNA) modifications are vital for protein synthesis accuracy and efficiency.
- The evolutionary trajectories and diversity of tRNA modifications are not fully understood.
- High-throughput sequencing methods like Ordered Two-Template Relay sequencing (OTTR-seq) enable genome-wide tRNA modification analysis.
Purpose of the Study:
- To comprehensively profile tRNA modifications across diverse archaeal species using OTTR-seq.
- To investigate the evolutionary dynamics and patterns of tRNA modifications in archaea.
- To correlate tRNA modifications with evolutionary changes in modifying enzymes.
Main Methods:
- Ordered Two-Template Relay sequencing (OTTR-seq) for transcriptome-wide tRNA modification detection.
- Comparative genomic analysis of tRNA modifying enzymes (e.g., Trm14, Trm10, Trm11, Trm1).
- Analysis of tRNA identity elements, including D-stem structures like the G10oU25 pair.
Main Results:
- Identified coordinated and mutually exclusive methylation patterns in hyperthermophilic archaea.
- Discovered clade-specific co-modifications at core positions in Thermoprotei, indicating tolerance of anti-determinants.
- Established associations between tRNA modifications and evolutionary divergence in enzyme domain architectures.
- Provided further insights into D-stem identity elements governing enzyme-substrate interactions.
Conclusions:
- Archaeal tRNA modification patterns exhibit significant evolutionary dynamics and diversity.
- Evolutionary changes in tRNA modifying enzymes are linked to observed modification patterns.
- Findings advance understanding of archaeal tRNA modification biology and evolution.
- This study provides a basis for future biochemical and mechanistic investigations.
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