| HGNC Family | Non-coding RNAs |
| Name | microRNA 451a |
| Description | microRNAs (miRNAs) are short (20-24 nt) non-coding RNAs that are involved in post-transcriptional regulation of gene expression in multicellular organisms by affecting both the stability and translation of mRNAs. miRNAs are transcribed by RNA polymerase II as part of capped and polyadenylated primary transcripts (pri-miRNAs) that can be either protein-coding or non-coding. The primary transcript is cleaved by the Drosha ribonuclease III enzyme to produce an approximately 70-nt stem-loop precursor miRNA (pre-miRNA), which is further cleaved by the cytoplasmic Dicer ribonuclease to generate the mature miRNA and antisense miRNA star (miRNA*) products. The mature miRNA is incorporated into a RNA-induced silencing complex (RISC), which recognizes target mRNAs through imperfect base pairing with the miRNA and most commonly results in translational inhibition or destabilization of the target mRNA. The RefSeq represents the predicted microRNA stem-loop. [provided by RefSeq, Sep 2009] |
| Summary |
{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRecent studies have revealed that miR‐451a is generated by an unusual, non‐canonical biogenesis pathway that distinguishes it from the vast majority of animal microRNAs. Instead of the typical sequential Drosha–Dicer processing, its maturation depends on Drosha cleavage of a short hairpin precursor followed by direct Ago2‐mediated cleavage and subsequent 3′ trimming by PARN. This alternative processing route not only highlights its evolutionary conservation but also suggests that miR‐451a may serve as a model for Dicer‐independent gene regulation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn diverse cancer types miR‐451a appears to play a multifaceted tumor‐suppressive role. In breast cancer, for example, altered miR‐451a expression is involved in regulating drug resistance through modulation of multidrug transporter proteins such as P‐glycoprotein and the MDR1 gene product, with restoration of miR‐451a enhancing cellular sensitivity to chemotherapeutics."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": " In brain tumors such as glioblastoma, its levels are dynamically tuned in response to glucose availability to govern the balance between proliferation and migration via the LKB1/AMPK pathway."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": " In non‐small cell lung cancer, colorectal, hepatocellular, and papillary thyroid carcinomas, miR‐451a targets key oncogenic effectors—including RAB14, components of the PI3K/Akt/mTOR cascade (via regulators such as CAB39 and TSC1), BAP31, YWHAZ and c‐Myc—to suppress proliferation, invasion, epithelial–mesenchymal transition and to promote apoptosis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "16"}]}, {"type": "t", "text": " Moreover, modulation of miR‐451a expression has been linked to altered cellular responses in additional malignancies: in docetaxel‐resistant lung adenocarcinoma its re‐expression reverses an EMT‐like phenotype"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "17"}]}, {"type": "t", "text": ", while in T cell acute lymphoblastic leukemia and chronic myeloid leukemia deregulated miR‐451a contributes to oncogenic signaling."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "18"}]}, {"type": "t", "text": " Importantly, several reports also highlight its potential diagnostic and therapeutic value: altered miR‐451a levels in cancer stem cell subpopulations, circulating exosomes and tumor tissues (including colorectal cancer, multiple myeloma, pancreatic neoplasms, and hepatocellular carcinoma) correlate with tumor aggressiveness, chemoresistance and prognosis, thus positioning miR‐451a as a promising biomarker and target for tailored anticancer strategies."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "20", "end_ref": "34"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its roles in oncogenesis, miR‐451a is emerging as an important regulator in non‐malignant as well as systemic pathologies. In cardiovascular diseases, for instance, reduced miR‐451a expression has been implicated in the regulation of cardiomyocyte growth, autophagy, and hypertrophy by directly targeting components such as TSC1, thereby modulating mTOR activity."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "35"}]}, {"type": "t", "text": " In parallel, aberrant miR‐451a levels have been observed in autoimmune and neuropsychiatric disorders; its dysregulation in conditions such as autoimmune arthritis, major depression, and even autism spectrum disorders suggests that miR‐451a may influence inflammatory responses and neuroimmune signaling."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "18"}, {"type": "fg_f", "ref": "37"}]}, {"type": "t", "text": " Collectively, these findings underscore the broad physiological relevance of miR‐451a—from its unique biogenesis to its capacity to modulate critical signaling networks in both cancer and systemic diseases—thereby offering new avenues for biomarker development and therapeutic intervention.\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Jr-Shiuan Yang, Thomas Maurin, Nicolas Robine, et al. 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| Synonyms | MIR-451A, HSA-MIR-451A, HSA-MIR-451, MIR451, MIRN451 |
| NCBI Gene ID | 574411 |
| API | |
| Download Associations | |
| Predicted Functions |
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| Co-expressed Genes |
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| Expression in Tissues and Cell Lines |
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MIR451A has 893 functional associations with biological entities spanning 6 categories (molecular profile, disease, phenotype or trait, functional term, phrase or reference, chemical, cell line, cell type or tissue, gene, protein or microRNA) extracted from 18 datasets.
Click the + buttons to view associations for MIR451A from the datasets below.
If available, associations are ranked by standardized value
| Dataset | Summary | |
|---|---|---|
| CCLE Cell Line Gene CNV Profiles | cell lines with high or low copy number of MIR451A gene relative to other cell lines from the CCLE Cell Line Gene CNV Profiles dataset. | |
| ChEA Transcription Factor Binding Site Profiles | transcription factor binding site profiles with transcription factor binding evidence at the promoter of MIR451A gene from the CHEA Transcription Factor Binding Site Profiles dataset. | |
| ChEA Transcription Factor Targets | transcription factors binding the promoter of MIR451A gene in low- or high-throughput transcription factor functional studies from the CHEA Transcription Factor Targets dataset. | |
| COSMIC Cell Line Gene CNV Profiles | cell lines with high or low copy number of MIR451A gene relative to other cell lines from the COSMIC Cell Line Gene CNV Profiles dataset. | |
| CTD Gene-Disease Associations | diseases associated with MIR451A gene/protein from the curated CTD Gene-Disease Associations dataset. | |
| ENCODE Histone Modification Site Profiles | histone modification site profiles with high histone modification abundance at MIR451A gene from the ENCODE Histone Modification Site Profiles dataset. | |
| ENCODE Transcription Factor Binding Site Profiles | transcription factor binding site profiles with transcription factor binding evidence at the promoter of MIR451A gene from the ENCODE Transcription Factor Binding Site Profiles dataset. | |
| ENCODE Transcription Factor Targets | transcription factors binding the promoter of MIR451A gene in ChIP-seq datasets from the ENCODE Transcription Factor Targets dataset. | |
| GeneRIF Biological Term Annotations | biological terms co-occuring with MIR451A gene in literature-supported statements describing functions of genes from the GeneRIF Biological Term Annotations dataset. | |
| GeneSigDB Published Gene Signatures | PubMedIDs of publications reporting gene signatures containing MIR451A from the GeneSigDB Published Gene Signatures dataset. | |
| GEO Signatures of Differentially Expressed Genes for Small Molecules | small molecule perturbations changing expression of MIR451A gene from the GEO Signatures of Differentially Expressed Genes for Small Molecules dataset. | |
| GEO Signatures of Differentially Expressed Genes for Transcription Factor Perturbations | transcription factor perturbations changing expression of MIR451A gene from the GEO Signatures of Differentially Expressed Genes for Transcription Factor Perturbations dataset. | |
| Klijn et al., Nat. Biotechnol., 2015 Cell Line Gene CNV Profiles | cell lines with high or low copy number of MIR451A gene relative to other cell lines from the Klijn et al., Nat. Biotechnol., 2015 Cell Line Gene CNV Profiles dataset. | |
| MGI Mouse Phenotype Associations 2023 | phenotypes of transgenic mice caused by MIR451A gene mutations from the MGI Mouse Phenotype Associations 2023 dataset. | |
| MotifMap Predicted Transcription Factor Targets | transcription factors regulating expression of MIR451A gene predicted using known transcription factor binding site motifs from the MotifMap Predicted Transcription Factor Targets dataset. | |
| MPO Gene-Phenotype Associations | phenotypes of transgenic mice caused by MIR451A gene mutations from the MPO Gene-Phenotype Associations dataset. | |
| Roadmap Epigenomics Histone Modification Site Profiles | histone modification site profiles with high histone modification abundance at MIR451A gene from the Roadmap Epigenomics Histone Modification Site Profiles dataset. | |
| WikiPathways Pathways 2014 | pathways involving MIR451A protein from the Wikipathways Pathways 2014 dataset. | |