Article
Cross-talks between Metabolic and Translational Controls during Beige Adipocyte Differentiation

Published in
Nature Communications

Abstract
How metabolism and translation influence one another during cell differentiation is largely unexplored. Combining transcriptomic, translatomic, and proteomic analyses, the authors uncovered selective translational remodeling that shapes thermogenic adipocyte metabolism. A pivotal observation was that altered glutamate metabolism lowers glutamate availability for tRNA charging, which increases ribosome pausing at glutamate codons. This slowdown reduced the synthesis and stability of glutamate-codon-rich transcripts, notably genes governing actin cytoskeleton organization. The data demonstrate that amino acid availability and tRNA charging can directly steer translation elongation and differentiation programs.

Results

• Beige adipocyte differentiation involves extensive remodeling of translation and protein expression.
• OXPHOS component genes are selectively downregulated at the translational level, while TCA cycle genes gain translation.
• High-resolution ribosome profiling reveals increased pausing at glutamate codons during differentiation.
• Stalling stems from altered glutamate metabolism that lowers intracellular glutamate for charging cognate tRNA-Glu.
• Reduced tRNA-Glu charging impairs elongation and lowers protein synthesis efficiency.
• Glutamate-codon-rich transcripts, including actin cytoskeleton genes, show reduced translation and mRNA stability.
• Manipulating glutamate metabolism alters cytoskeletal organization and adipocyte differentiation, tying metabolic state directly to translational control.

trna-charging-analysis-in-metabolism-beige-adipocyte-differentiation_1.png

Fig. 1. Altered glutamate metabolism reduces tRNA-Glu charging, increases ribosome pausing at glutamate codons, and suppresses translation of glutamate-rich genes during beige adipocyte differentiation.

Conclusion
tRNA charging stands out from this study as the mechanistic bridge between metabolism and translational regulation during cellular differentiation. Metabolic remodeling in differentiating adipocytes limits glutamate availability, reduces tRNA-Glu aminoacylation, and promotes ribosome pausing at glutamate codons. These translational effects selectively reshape protein synthesis and gene expression needed for adipocyte development. The findings underscore tRNA charging as an important regulatory layer through which metabolic states influence cell fate decisions, thermogenic function, and energy metabolism.

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