Aminoacyl-tRNA synthetase organization is crucial for mammalian brain development

Untethering Arginyl-tRNA synthetase (RARS1) from the multi-tRNA synthetase complex in mouse forebrains causes severe oligodendrocyte loss, myelination defects, and profound behavioral abnormalities.

• Why it matters: Spatial control of protein synthesis is essential for CNS development, yet how aminoacyl-tRNA synthetase complex organization supports brain cell function—and white matter integrity—was unclear.
• What they did: The authors engineered a mouse line with RARS1 untethered in forebrains, then assessed behavior, brain anatomy, RARS1 subcellular trafficking, ribosome colocalization, integrated stress response activation, and proteomics of newly made proteins.
• The result: Disrupting the complex mis-trafficked RARS1, reduced its ribosome colocalization, activated integrated stress response, and specifically lowered translation in cellular projections, impairing myelin structural proteins and linking molecular disruption to white matter pathology.

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