Non-Coding RNA Functions in Cellular Processes

Non-coding RNAs (ncRNAs) constitute a diverse class of RNA molecules that do not encode proteins but exert critical regulatory roles in virtually all aspects of cellular physiology. MicroRNAs (miRNAs) guide post-transcriptional repression by base-pairing with target messenger RNAs, thereby fine-tuning gene expression networks involved in development, stress responses and homeostasis. Long non-coding RNAs (lncRNAs) modulate chromatin architecture, recruit specialised protein complexes to genomic loci and act as molecular scaffolds or decoys, thus influencing transcriptional programmes and epigenetic states. Circular RNAs (circRNAs) arise from back-splicing events and serve as miRNA sponges or interact with RNA-binding proteins to regulate splicing and translation. A distinct family of small ncRNAs, the Y RNAs, are essential for DNA replication initiation and assemble into ribonucleoprotein particles that contribute to RNA quality control and cellular responses to stress. Collectively, these ncRNA species partake in the regulation of cell proliferation, differentiation, apoptosis and immune modulation, with dysregulation implicated in cancer, neurodegeneration, cardiovascular disorders and infectious diseases. The capacity of ncRNAs to shuttle between cellular compartments and to populate extracellular vesicles underpins their emerging utility as minimally invasive biomarkers and as therapeutic agents or targets in precision medicine.

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Recent work has illuminated mechanisms by which ncRNAs are dynamically processed during programmed cell death. A study demonstrated that polypyrimidine tract-binding protein 1 shields Y RNAs from caspase 3-mediated cleavage, thereby regulating the biogenesis of Argonaute-bound small RNAs in apoptosis and linking RNA turnover to immune homeostasis. In another report, hypoxia-induced alterations in Y RNA fragments were profiled in canine oral melanoma, revealing decreased Y RNA levels in metastatic versus primary tumours and identifying these fragments in plasma and extracellular vesicles as high-accuracy biomarkers for metastatic progression. Foundational investigations into POLIII-derived ncRNAs have further uncovered their dual roles as scaffolds that nucleate ribonucleoprotein assemblies and as decoys that compete with other RNAs for binding to RNA-binding proteins, thus orchestrating mRNA fate and gene expression programmes across eukaryotic cells.

Non-Coding RNA Functions in Cellular Processes publication trend

The graph below shows the total number of articles in non-coding rna functions in cellular processes across all publications each year (not limited to Nature Index journals).

Technical terms

Non-coding RNA (ncRNA): An RNA molecule that does not encode a protein but regulates gene expression or other cellular processes.

MicroRNA (miRNA): A ~22-nucleotide ncRNA that post-transcriptionally represses target mRNAs by base pairing and recruiting effector complexes.

Long non-coding RNA (lncRNA): A heterogeneous class of ncRNAs longer than 200 nucleotides that modulate chromatin, transcription and RNA processing.

Circular RNA (circRNA): A covalently closed RNA species generated by back-splicing, functioning as molecular sponges or protein interactors.

Y RNA: A small (~100 nt) ncRNA involved in the initiation of DNA replication and forming ribonucleoprotein complexes with Ro60 and La proteins.

Ribonucleoprotein complex (RNP): A structural assembly of RNA and associated proteins that underlies the function and stability of RNA molecules.

References

1. PTBP1 protects Y RNA from cleavage leading to its apoptosis-specific degradation. Cell Death Discovery (2024).
2. Hypoxia-related Y RNA fragments as a novel potential biomarker for distinguishing metastatic oral melanoma from non-metastatic oral melanoma in dogs. Veterinary Quarterly (2024).
3. POLIII-derived non-coding RNAs acting as scaffolds and decoys. Journal of Molecular Cell Biology (2019).