Popular Review,LncRNAs were originally considered transcriptional noise

For decades, the central dogma of molecular biology dictated that RNA primarily served as an intermediary between DNA and protein. However, recent scientific endeavors have unveiled a fascinating paradigm shift: noncoding RNA (ncRNA), once considered mere transcriptional noise, can actively encode peptides. This groundbreaking discovery has opened up a new realm of research, providing profound insights into the noncoding RNA-encoded peptides (ncPEPs) and their multifaceted roles in cellular processes.

Historically, most noncoding RNA (ncRNA) transcripts were understood to function directly as functional RNAs, such as ribosomal RNA (rRNA) and transfer RNA (tRNA), or as regulatory molecules like microRNAs (miRNAs) and long non-coding RNAs (lncRNAs). The prevailing belief was that these transcripts lacked the capacity for protein synthesis. However, the emergent discovery of noncoding RNA-encoded peptides has challenged this long-held notion, urging scientists to view ncRNAs from a new perspective. These short chains of amino acids, often referred to as micropeptides or small peptides, are translated from transcripts previously identified as non-coding.

The field of ncPEPs mining methods in plants is rapidly advancing, with researchers developing sophisticated computational tools and techniques for their prediction, identification, and functional analysis. This has led to the unveiling of secrets surrounding these enigmatic molecules. For instance, lncRNA-encoded micropeptides are gaining significant attention due to their potential involvement in a wide array of biological functions. Studies have shown that ncRNA-encoded peptides can affect cancer cell proliferation, metastasis, the tumor vasculature, stemness, malignant differentiation, senescence, and ferroptosis, highlighting their critical role in disease pathogenesis.

Furthermore, the exploration of non-coding RNA biology has revealed that LncRNAs were originally considered transcriptional noise, but now have gained recognition for their potential to encode functional peptides. These peptides encoded by noncoding genes are not only involved in fundamental cellular processes but also play crucial roles in specific physiological contexts. For example, lncRNA-encoded peptides have been found to influence muscle function, mRNA stability, and gene expression. In mammals, lncRNA-encoded peptides are actively being studied for their regulatory pathways.

The significance of noncoding RNA-encoded peptides extends to various biological systems. In human biology, lncRNAs and their encoded peptides play important roles. The translation of these ncRNAs into peptides is a complex process, and understanding its intricacies is crucial. Research indicates that these peptides/proteins play an important role in regulating tumor energy metabolism and the epithelial to mesenchymal transition of cancer cells. This suggests a significant therapeutic potential for targeting these encoded peptides.

Among the diverse types of ncPEPs, microRNA (miRNA)-encoded peptides (miPEPs) represent a distinct category, translated from their precursor miRNAs. The investigation into non-coding RNA and its ability to produce peptides is a dynamic area of research. The discovery of hidden peptides encoded by putative noncoding RNAs underscores the vast, unexplored potential within the genome. Many mature lncRNAs, for instance, are modified with a 5' cap and 3' poly(A) tail and are exported from the nucleus to the cytoplasm, enabling their translation into peptides.

The exploration into non-coding RNA-encoded peptides is a testament to the evolving nature of biological understanding. As research progresses, we gain deeper insights into the functional implications of these peptides, their intricate regulatory mechanisms, and their potential applications in medicine and beyond. The journey of uncovering the full spectrum of ncPEPs is ongoing, promising further revelations about the hidden language of our genome.