MicroRNA Regulation in Gene Expression

MicroRNAs (miRNAs) are short, non-coding RNA molecules that modulate gene expression at the post-transcriptional level. By pairing with complementary sequences, usually in the 3′ untranslated region (3′UTR) of messenger RNAs (mRNAs), miRNAs recruit effector proteins to repress translation or promote mRNA degradation. This regulatory layer contributes to the fine-tuning of cellular processes such as development, differentiation, metabolic homeostasis and stress responses. The repertoire of miRNA targets is vast and dynamic, encompassing thousands of transcripts that vary with cell type, developmental stage and environmental cues. Complexities arise from non-canonical binding sites, cooperative interactions among multiple miRNAs and context-dependent modulation by RNA-binding proteins. Advances in high-throughput and single-cell techniques have begun to unravel these intricacies, offering new insights into the role of miRNAs in health and disease. Ongoing research continues to reveal the global significance of miRNA networks, with implications for diagnostics, therapeutics and our understanding of evolutionary pressures on regulatory pathways.

Research from Nature Portfolio

Recent studies have introduced innovative methods to chart miRNA-target interactions at unprecedented resolution. One approach fuses Argonaute2 with an RNA-editing enzyme to enable the direct detection of miRNA targets in single cells. This method not only identifies functional binding sites transcriptome-wide but also captures cell-cycle-dependent shifts in miRNA targeting, paving the way for insights into heterogeneity within complex tissues. In a complementary development, high-throughput mapping of endogenous miRNA–mRNA chimeras has defined expanded rules of target recognition. By ligating native miRNA–target pairs, this strategy has uncovered the importance of 3′-end pairing in Argonaute specificity and demonstrated that auxiliary pairing beyond the seed region contributes substantially to target selection.

MicroRNA Regulation in Gene Expression publication trend

The graph below shows the total number of articles in microrna regulation in gene expression across all publications each year (not limited to Nature Index journals).

Technical terms

MicroRNA (miRNA): A small, non-coding RNA molecule (~22 nucleotides) that regulates gene expression by base pairing with target mRNAs.

Argonaute2: A core component of the RNA-induced silencing complex (RISC) that binds miRNAs and mediates target repression.

3′ Untranslated Region (3′UTR): The non-coding sequence at the end of an mRNA where miRNA binding typically occurs.

Transcriptome-wide: Referring to analyses that survey all RNA transcripts present in a cell or tissue.

Targetome: The complete set of mRNA targets regulated by a specific miRNA or miRNA family.

Seed Region: A conserved sequence (positions 2–7 or 2–8 of the miRNA) critical for initial target recognition and binding specificity.

References

1. Detection of transcriptome-wide microRNA–target interactions in single cells with agoTRIBE. Nature Biotechnology (2023).
2. miRNA–target chimeras reveal miRNA 3′-end pairing as a major determinant of Argonaute target specificity. Nature Communications (2015).
3. The miRNA–target interactions: An underestimated intricacy. Nucleic Acids Research (2023).
4. Experimental capture of miRNA targetomes: disease-specific 3′UTR library-based miRNA targetomics for Parkinson’s disease. Experimental & Molecular Medicine (2024).
5. Bioenergetic costs and the evolution of noise regulation by microRNAs. Proceedings of the National Academy of Sciences of the United States of America (2024).