[Cis-regulatory mechanisms and biological effects of translation elongation]

Proteins are biological macromolecules essential for cells to maintain their metabolic activities. Proteins are synthesized during translation elongation, a synergistic process in which ribosomes decode the genetic information transmitted in mRNA, using tRNA. Numerous human diseases, such as neurodegenerative diseases and cancers, are known to be related to abnormal translation elongation. Translation elongation, as one of the two critical steps for the central dogma, used to be the focus of research in molecular biology. However, limitations in methodology had hindered further investigations on the dynamic process of translation elongation and its regulation. Recently, breakthroughs in methodology have revived this research field. Studies in the past decade or so have revealed that, beyond simple decoding of genetic information in mRNA, translation elongation entails sophisticated regulatory mechanisms and multifaceted biological consequences; such insights have provided a novel theoretical framework for understanding the maintenance of protein homeostasis and the development of diseases. In this review, we summarize the most updated methods that can be used to investigate the processes of translation elongation and highlight the mechanisms by which mRNA and protein sequences modulate the local rate of translation elongation. We further enumerate the consequences of dysregulation in translation elongation, from various aspects such as mRNA stability, protein synthesis and degradation, protein subcellular localization, and co-translational protein folding. We anticipate that this review will serve to draw the attention of scholars in various research fields to participate in the study of translation elongation.