LncRNA-Encoded Micropeptides: Expression Validation, Translational Mechanisms, and Roles in Cellular Metabolism.

The discovery of functional micropeptides encoded by long noncoding RNAs (lncRNAs) has challenged the traditional view that these transcripts lack coding potential. With the advancement of high-resolution translation profiling combined with enhanced MS-based techniques, numerous lncRNAs have been found to harbor small open reading frames (sORFs) that give rise to bioactive micropeptides. These peptides participate in diverse biological processes, particularly in cellular metabolism, by modulating enzymatic activity and metabolic pathways. However, the identification and functional characterization of these micropeptides remain technically challenging due to their small size, low abundance, and the need for rigorous downstream validation studies. This review encompasses a comprehensive overview of the biogenesis of lncRNA-derived micropeptides, methodologies for detecting and validating their expression, the molecular mechanisms governing their translation, and their emerging roles in metabolic regulation. By integrating current findings and technological advancements, we highlight the potential physiological and pathological implications of these micropeptides and outline future research directions in the field.