| HGNC Family | Non-coding RNAs |
| Name | microRNA let-7d |
| 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": "\nMiR‐let‑7d exerts multifaceted tumor‐suppressive functions in several cancers. In oral squamous cell carcinoma and renal cell carcinoma, its downregulation is associated with enhanced epithelial–mesenchymal transition, increased migration/invasion and chemoresistance, while experimental overexpression reverses these malignant traits. In ovarian cancer and triple‐negative breast cancer, miR‐let‑7d suppresses cell proliferation, promotes apoptosis and increases chemosensitivity by targeting key oncogenic regulators such as HMGA1, cyclin D1/Akt1/Wnt1 and other effectors. Similarly, in osteosarcoma cancer stem cells, overexpression of miR‐let‑7d reduces stemness and proliferation, albeit sometimes concomitantly enhancing migratory potential, underscoring a context‐dependent dual role in tumor biology."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "8"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn fibrotic pathologies, miR‐let‑7d plays a key antifibrogenic role. In idiopathic pulmonary fibrosis and related models, reduced miR‐let‑7d levels impair epigenetic gene silencing and promote transforming growth factor‐β–driven epithelial–mesenchymal transition, whereas restoration of miR‐let‑7d expression—as also observed in intrauterine adhesion models where it represses HMGA2—attenuates fibrogenesis and EMT processes."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "9", "end_ref": "11"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMiR‐let‑7d also contributes to the regulation of vascular and metabolic homeostasis. In endothelial cells, its overexpression limits proliferation, migration, and tubulogenesis through direct targeting of IFI44L, while in vascular smooth muscle cells increased miR‐let‑7d levels reduce cell proliferation and inflammatory signaling (notably through NF‑κB attenuation), suggesting a protective role against atherosclerosis. Moreover, its dysregulation has been implicated in metabolic liver disorders such as non‑alcoholic fatty liver disease, highlighting its promise as a circulating diagnostic biomarker."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "12", "end_ref": "15"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its roles in cancer and vascular regulation, miR‐let‑7d is emerging as a critical modulator in several neurological, autoimmune, and reproductive disorders. Elevated circulating miR‐let‑7d levels have been identified as potential biomarkers in attention‑deficit/hyperactivity disorder, while in fibromyalgia its expression correlates with small nerve fiber loss. In autoimmune conditions such as primary Sjögren’s syndrome, miR‐let‑7d regulates interleukin‑17 expression via AKT1/mTOR signaling. Its aberrant expression in granulosa cells of polycystic ovary syndrome and in trophoblasts of pre‑eclamptic pregnancies further supports roles in modulating cell proliferation, invasion, and apoptosis in reproductive tissues. Moreover, altered miR‐let‑7d levels in Down syndrome and Alzheimer’s disease, among other conditions, underscore its potential as a diagnostic and prognostic blood‑based biomarker."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "16", "end_ref": "22"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFinally, miR‐let‑7d is embedded in a complex regulatory network responsive to metabolic and hormonal cues. Its transcription is subject to modulation by factors such as MYC, Lin28B, and nutrient signals including glucose and inflammatory cytokines, as demonstrated by promoter analyses. This dynamic regulation further reinforces its broad potential as both a therapeutic target and non‑invasive biomarker across diverse disease states."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "23", "end_ref": "25"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Charn-Jung Chang, Chuan-Chih Hsu, Chin-Hong Chang, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "Increased let-7d-5p in non-alcoholic fatty liver promotes insulin resistance and is a potential blood biomarker for diagnosis."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Liver Int (2023)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1111/liv.15581"}], "href": "https://doi.org/10.1111/liv.15581"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "37057737"}], "href": "https://pubmed.ncbi.nlm.nih.gov/37057737"}]}]}]}
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| Synonyms | LET-7D, HSA-LET-7D, MIRNLET7D, LET7D |
| NCBI Gene ID | 406886 |
| 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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MIRLET7D has 891 functional associations with biological entities spanning 7 categories (molecular profile, organism, functional term, phrase or reference, disease, phenotype or trait, chemical, cell line, cell type or tissue, gene, protein or microRNA) extracted from 28 datasets.
Click the + buttons to view associations for MIRLET7D 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 MIRLET7D 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 MIRLET7D gene from the CHEA Transcription Factor Binding Site Profiles dataset. | |
| ChEA Transcription Factor Targets | transcription factors binding the promoter of MIRLET7D gene in low- or high-throughput transcription factor functional studies from the CHEA Transcription Factor Targets dataset. | |
| COMPARTMENTS Text-mining Protein Localization Evidence Scores | cellular components co-occuring with MIRLET7D protein in abstracts of biomedical publications from the COMPARTMENTS Text-mining Protein Localization Evidence Scores dataset. | |
| COSMIC Cell Line Gene CNV Profiles | cell lines with high or low copy number of MIRLET7D gene relative to other cell lines from the COSMIC Cell Line Gene CNV Profiles dataset. | |
| CTD Gene-Disease Associations | diseases associated with MIRLET7D gene/protein from the curated CTD Gene-Disease Associations dataset. | |
| DISEASES Text-mining Gene-Disease Association Evidence Scores | diseases co-occuring with MIRLET7D gene in abstracts of biomedical publications from the DISEASES Text-mining Gene-Disease Assocation Evidence Scores dataset. | |
| ENCODE Histone Modification Site Profiles | histone modification site profiles with high histone modification abundance at MIRLET7D 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 MIRLET7D gene from the ENCODE Transcription Factor Binding Site Profiles dataset. | |
| ENCODE Transcription Factor Targets | transcription factors binding the promoter of MIRLET7D gene in ChIP-seq datasets from the ENCODE Transcription Factor Targets dataset. | |
| GeneRIF Biological Term Annotations | biological terms co-occuring with MIRLET7D 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 MIRLET7D from the GeneSigDB Published Gene Signatures dataset. | |
| GEO Signatures of Differentially Expressed Genes for Diseases | disease perturbations changing expression of MIRLET7D gene from the GEO Signatures of Differentially Expressed Genes for Diseases dataset. | |
| GEO Signatures of Differentially Expressed Genes for Gene Perturbations | gene perturbations changing expression of MIRLET7D gene from the GEO Signatures of Differentially Expressed Genes for Gene Perturbations dataset. | |
| GEO Signatures of Differentially Expressed Genes for Kinase Perturbations | kinase perturbations changing expression of MIRLET7D gene from the GEO Signatures of Differentially Expressed Genes for Kinase Perturbations dataset. | |
| GEO Signatures of Differentially Expressed Genes for Small Molecules | small molecule perturbations changing expression of MIRLET7D 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 MIRLET7D gene from the GEO Signatures of Differentially Expressed Genes for Transcription Factor Perturbations dataset. | |
| GEO Signatures of Differentially Expressed Genes for Viral Infections | virus perturbations changing expression of MIRLET7D gene from the GEO Signatures of Differentially Expressed Genes for Viral Infections dataset. | |
| GTEx Tissue Gene Expression Profiles | tissues with high or low expression of MIRLET7D gene relative to other tissues from the GTEx Tissue Gene Expression Profiles dataset. | |
| HuGE Navigator Gene-Phenotype Associations | phenotypes associated with MIRLET7D gene by text-mining GWAS publications from the HuGE Navigator Gene-Phenotype Associations dataset. | |
| JASPAR Predicted Transcription Factor Targets | transcription factors regulating expression of MIRLET7D gene predicted using known transcription factor binding site motifs from the JASPAR Predicted Transcription Factor Targets dataset. | |
| Klijn et al., Nat. Biotechnol., 2015 Cell Line Gene CNV Profiles | cell lines with high or low copy number of MIRLET7D gene relative to other cell lines from the Klijn et al., Nat. Biotechnol., 2015 Cell Line Gene CNV Profiles dataset. | |
| Klijn et al., Nat. Biotechnol., 2015 Cell Line Gene Expression Profiles | cell lines with high or low expression of MIRLET7D gene relative to other cell lines from the Klijn et al., Nat. Biotechnol., 2015 Cell Line Gene Expression Profiles dataset. | |
| KnockTF Gene Expression Profiles with Transcription Factor Perturbations | transcription factor perturbations changing expression of MIRLET7D gene from the KnockTF Gene Expression Profiles with Transcription Factor Perturbations dataset. | |
| MotifMap Predicted Transcription Factor Targets | transcription factors regulating expression of MIRLET7D gene predicted using known transcription factor binding site motifs from the MotifMap Predicted Transcription Factor Targets dataset. | |
| Roadmap Epigenomics Histone Modification Site Profiles | histone modification site profiles with high histone modification abundance at MIRLET7D gene from the Roadmap Epigenomics Histone Modification Site Profiles dataset. | |
| TISSUES Text-mining Tissue Protein Expression Evidence Scores | tissues co-occuring with MIRLET7D protein in abstracts of biomedical publications from the TISSUES Text-mining Tissue Protein Expression Evidence Scores dataset. | |
| WikiPathways Pathways 2014 | pathways involving MIRLET7D protein from the Wikipathways Pathways 2014 dataset. | |