tRNA dysregulation and disease

tRNA function and gene expression profiles are dynamically regulated by post-transcriptional tRNA modifications. Here, Orellana et al. discuss the canonical role of tRNAs in mRNA translation, focusing on alterations in tRNA abundance or function implicated in human diseases. tRNAs are key adaptor molecules that decipher the genetic code during translation of mRNAs in protein synthesis. In contrast to the traditional view of tRNAs as ubiquitously expressed housekeeping molecules, awareness is now growing that tRNA-encoding genes display tissue-specific and cell type-specific patterns of expression, and that tRNA gene expression and function are both dynamically regulated by post-transcriptional RNA modifications. Moreover, dysregulation of tRNAs, mediated by alterations in either their abundance or function, can have deleterious consequences that contribute to several distinct human diseases, including neurological disorders and cancer. Accumulating evidence shows that reprogramming of mRNA translation through altered tRNA activity can drive pathological processes in a codon-dependent manner. This Review considers the emerging evidence in support of the precise control of functional tRNA levels as an important regulatory mechanism that coordinates mRNA translation and protein expression in physiological cell homeostasis, and highlights key examples of human diseases that are linked directly to tRNA dysregulation.

Automated summary

tRNA function and gene expression are dynamically regulated by post-transcriptional modifications. tRNAs play an important role in protein synthesis and show tissue-specific and cell type-specific expression patterns. Dysregulation of tRNAs can contribute to various human diseases, and controlling functional tRNA levels is crucial for mRNA translation and protein expression.