Hidden Proteins Found in Long Noncoding RNA

Scientists have long considered long noncoding RNAs (lncRNAs) to be regulatory elements that do not encode proteins. A recent publication by Stav Zok and Professor Michal Linial of the Hebrew University of Jerusalem challenges this view, presenting evidence that many lncRNAs actually contain short open reading frames capable of producing functional peptides. The team used ribosome profiling and mass‑spectrometry data to identify dozens of previously unrecognized micropeptides derived from lncRNA transcripts in human cells.

The study demonstrates that these micropeptides are not merely translational noise; they are expressed at measurable levels, exhibit tissue‑specific patterns, and in some cases interact with known protein complexes. By mapping the peptide sequences back to their lncRNA origins, the researchers revealed that the conventional annotation of the human genome underestimates the coding potential of noncoding regions. The findings suggest that the regulatory roles of lncRNAs may be coupled with, or even mediated by, the peptides they encode.

If confirmed by further research, this expanded understanding of lncRNA function could reshape models of gene regulation and disease mechanisms, prompting a re‑evaluation of genomic annotations and the potential therapeutic targeting of lncRNA‑derived peptides.