MIR155 encodes miR-155, a microRNA whose core molecular role is to guide Argonaute/RISC to target RNAs for miRNA-mediated post-transcriptional gene regulation. MIR155 is important in immune responses and oncogenesis, but those are context-specific regulatory outcomes rather than separate molecular functions.
| GO Term | Evidence | Action | Reason |
|---|---|---|---|
|
GO:0035195
miRNA-mediated post-transcriptional gene silencing
|
IEA
GO_REF:0000115 |
ACCEPT |
Summary: RNAcentral/Rfam annotation for the primary biological process that MIR155 participates in.
Reason: MIR155 is a microRNA precursor and its mature product participates in miRNA-mediated post-transcriptional gene silencing.
Supporting Evidence:
PMID:23416982
MicroRNA-155 (miR-155) is an established oncomiR in breast cancer and regulates several pro-oncogenic pathways.
file:human/MIR155/MIR155-deep-research-falcon.md
Differential Ago HITS-CLIP/dCLIP comparing WT and miR-155-knockout activated CD4+ T cells identified miR-155-dependent Ago-binding sites, supporting miR-155-mediated post-transcriptional silencing.
|
|
GO:0016442
RISC complex
|
IEA
GO_REF:0000115 |
ACCEPT |
Summary: RNAcentral/Rfam annotation placing MIR155 in the RNA-induced silencing complex context.
Reason: Mature miRNAs guide RISC-mediated target repression, so this RNAcentral annotation is consistent with MIR155 biology.
Supporting Evidence:
file:human/MIR155/MIR155-deep-research-falcon.md
Direct Argonaute immunoprecipitation in human macrophages provides strong evidence that miR-155 strands are physically present in Argonaute/RISC complexes.
|
|
GO:0003730
mRNA 3'-UTR binding
|
NAS | NEW |
Summary: Added to align the core MIR155 molecular function with the annotation block. Mature miR-155 guides Argonaute/RISC to target RNAs, with target recognition mediated by base-pairing to sites that include mRNA 3'-UTRs.
Reason: Falcon found direct evidence for miR-155-dependent Argonaute occupancy at target sites, supporting the core mRNA 3'-UTR binding function used in the core_functions block.
Supporting Evidence:
file:human/MIR155/MIR155-deep-research-falcon.md
Differential Ago HITS-CLIP/dCLIP comparing WT and miR-155-knockout activated CD4+ T cells identified miR-155-dependent Ago-binding sites.
|
Q: What are the complete set of target mRNAs regulated by MIR155 in different cell types?
Suggested experts: microRNA researchers, cancer biologists
Q: How does MIR155 expression change during immune cell activation and differentiation?
Suggested experts: immunologists, T cell biologists
Experiment: CLIP-seq analysis to identify direct MIR155 target sites
Hypothesis: MIR155 directly binds to specific sequences in target mRNAs
Type: high-throughput sequencing
Experiment: Single-cell RNA-seq of immune cells with MIR155 knockdown
Hypothesis: MIR155 regulates immune cell differentiation programs
Type: single-cell analysis
MIR155 is a microRNA (miRNA) gene that produces short (~22 nt) mature miRNA strands (classically annotated as miR‑155‑5p and miR‑155‑3p) that function as sequence-specific guide RNAs for Argonaute proteins within the RNA-induced silencing complex (RISC). Its molecular function is therefore not enzymatic; it is an RNA effector that confers targeting specificity to RISC via base-pairing to complementary sites in target RNAs.
For a miRNA, GO-relevant core functions are those directly supported by experiments demonstrating:
- Association with Argonaute/RISC (cellular component and molecular function evidence), and
- Direct, sequence-dependent targeting of RNAs causing post-transcriptional gene silencing (biological process evidence), via mRNA destabilization and/or translational repression.
Immune and oncogenic roles are downstream phenotypic outcomes of altering gene networks; they are included here only insofar as they clarify direct molecular mechanism, location, and evidence-backed GO terms.
Argonaute RIP in primary human macrophages (direct RISC loading evidence). In primary human monocyte-derived macrophages, Simmonds (2019) immunoprecipitated Argonaute proteins (anti-Ago antibody 2A8) and measured miRNAs in the immunoprecipitate using absolute quantitation. The study reports that miR‑155‑3p was not detectable above background in resting cells but after 2 h LPS stimulation it was recovered from the Argonaute IP, consistent with RISC association/loading at the time of peak induction. The same approach detected miR‑155‑5p in Argonaute IP as well. Quantitatively, the study estimated cellular copy numbers in resting vs stimulated cells: miR‑155‑3p ~29±11 copies/cell at rest rising to ~767±137 copies/cell at 2 h LPS (range 446–1,134); miR‑155‑5p ~1,315±417 (rest) rising to ~5,578±1,361 (2 h LPS). This provides direct biochemical evidence supporting annotation of MIR155 products to the RNA-induced silencing complex and to guide-RNA molecular function through Argonaute association. (simmonds2019transientupregulationof pages 11-12, simmonds2019transientupregulationof pages 12-14, simmonds2019transientupregulationof media a21bb4f5, simmonds2019transientupregulationof media 5691fff6)
Argonaute2 RIP in human cells showing miR‑155 guide participation in an Ago2 miRNP. In HT‑29 human colon cancer cells, Al‑Haidari et al. (2018) used Ago2 immunoprecipitation and qRT-PCR to show that AntagomiR‑155‑5p reduced enrichment of both miR‑155‑5p and HuR (ELAVL1) mRNA in Ago2 immunoprecipitates, indicating that miR‑155‑5p participates in Ago2-containing ribonucleoprotein complexes engaging a target mRNA. (alhaidari2018mir1555pcontrolscolon pages 28-29)
Transcriptome-wide Argonaute CLIP mapping requires miR‑155 to direct Ago binding. Loeb et al. (2012) used differential Argonaute HITS-CLIP (“AGO dCLIP”) comparing WT vs miR‑155 knockout activated CD4+ T cells to identify miR‑155-dependent Ago-binding peaks, demonstrating that the presence of miR‑155 directs Argonaute binding to specific RNA sites. (loeb2012transcriptomewidemir155binding pages 1-2, loeb2012transcriptomewidemir155binding pages 2-3)
Direct, miR‑155-dependent Argonaute binding correlates with repression. Loeb et al. (2012) report that differential CLIP identified 191 miR‑155-dependent Ago binding sites in 175 genes (p<0.01), and that differential Ago binding correlated with target downregulation (p<0.05), supporting annotation to miRNA-mediated gene silencing and post-transcriptional regulation of gene expression. The study further reports that miR‑155–Ago complexes occupy >300 canonical 3′UTR sites with perfect 6–8 nt seed matches and that these canonical targets are strongly regulated by miR‑155. (loeb2012transcriptomewidemir155binding pages 2-3, loeb2012transcriptomewidemir155binding pages 7-8)
Noncanonical targeting is common for miR‑155 (refines mechanistic understanding but still core guide function). In the same Loeb et al. binding map, ~40% of miR‑155-dependent Ago binding sites lacked perfect seed matches, implying widespread noncanonical interactions; these tended to produce more modest regulation. Reporter validation showed mutation of predicted noncanonical sites significantly reduced repression by miR‑155, supporting direct functional targeting even without perfect seed matches. This evidence informs annotation to miRNA-mediated silencing without over-specifying “seed-only” rules. (loeb2012transcriptomewidemir155binding pages 7-8, loeb2012transcriptomewidemir155binding pages 6-7)
Direct sequence-element dependence in a miR‑155-guided interaction (context-dependent repression vs activation). Al‑Haidari et al. (2018) provide direct evidence that miR‑155‑5p binds AU-rich elements in the HuR 3′UTR, validated using target-site blockers and ribonucleoprotein immunoprecipitation approaches. Notably, they observe context dependence (serum-starved vs serum-fed) where miR‑155‑5p can positively regulate HuR translation/mRNA levels under quiescence-like conditions; this does not negate the core GO process (post-transcriptional regulation via guide RNA), but cautions that “gene silencing” directionality may depend on cellular state and target context. (alhaidari2018mir1555pcontrolscolon pages 1-7, alhaidari2018mir1555pcontrolscolon pages 7-11)
Supported: RISC / Argonaute-containing cytoplasmic effector complex. Direct Argonaute immunoprecipitation in human macrophages provides strong evidence that miR‑155 strands are physically present in Argonaute/RISC complexes. This supports GO cellular component annotation to RNA-induced silencing complex. (simmonds2019transientupregulationof pages 11-12, simmonds2019transientupregulationof pages 12-14, simmonds2019transientupregulationof media a21bb4f5, simmonds2019transientupregulationof media 5691fff6)
Not sufficiently supported in the current primary-evidence set: P-bodies, stress granules, extracellular vesicles. Although many reviews and some non-miR‑155-specific literature connect Ago/miRNPs to P-bodies and EV biology, the retrieved primary evidence in this run does not provide a direct, miR‑155-specific demonstration (e.g., microscopy co-localization of miR‑155 with P-body markers; EV isolation plus miR‑155 quantification with rigorous controls) that would justify assigning MIR155 a GO cellular component annotation to P-body/stress granule or extracellular vesicle as a core function. (witten2020mir155asa pages 18-19, de2020amyloidbetaoligomers pages 25-30)
The table below summarizes GO-relevant annotations derived from direct evidence in the primary literature available here and flags terms that are not currently well supported.
| GO aspect | GO term label (GO ID if known) | Evidence summary | miR-155 strand | Biological system | Supporting citations |
|---|---|---|---|---|---|
| MF | miRNA-mediated gene silencing by RNA binding | Argonaute RIP in primary human monocyte-derived macrophages using anti-Ago (2A8) recovered miR-155-3p and miR-155-5p from RISC; miR-155-3p was undetectable above background in resting cells but recovered after 2 h LPS, indicating direct guide-RNA association with Ago/RISC. | 3p, 5p | Primary human monocyte-derived macrophages | (simmonds2019transientupregulationof pages 11-12, simmonds2019transientupregulationof pages 12-14) |
| MF | RNA guide activity | Ago2-RIP/qRT-PCR in HT-29 cells showed antagomiR-155-5p reduced enrichment of both miR-155-5p and HuR mRNA in Ago2 immunoprecipitates, supporting direct guide-RNA function of miR-155-5p within Ago2-containing effector complexes. | 5p | HT-29 human colon cancer cells | (alhaidari2018mir1555pcontrolscolon pages 28-29, alhaidari2018mir1555pcontrolscolon pages 7-11) |
| BP | miRNA-mediated post-transcriptional gene silencing (GO:0035195) | Differential Ago HITS-CLIP/dCLIP comparing WT and miR-155-knockout activated CD4+ T cells identified 191 miR-155-dependent Ago-binding sites in 175 genes; loss of miR-155 reduced Ago occupancy and correlated with target downregulation/repression, providing transcriptome-wide evidence for miR-155-mediated silencing. | 5p | Activated murine CD4+ T cells | (loeb2012transcriptomewidemir155binding pages 1-2, loeb2012transcriptomewidemir155binding pages 2-3) |
| BP | post-transcriptional regulation of gene expression | In serum-starved HT-29 cells, target-site blocker and Ago2-RIP experiments showed miR-155-5p directly binds AU-rich elements in the HuR 3′UTR and regulates HuR mRNA levels/translation post-transcriptionally. | 5p | HT-29 human colon cancer cells | (alhaidari2018mir1555pcontrolscolon pages 1-7, alhaidari2018mir1555pcontrolscolon pages 7-11) |
| BP | gene silencing by miRNA | Transcriptome-wide Ago dCLIP showed miR-155 guides Ago to >300 canonical 3′UTR sites and many noncanonical sites; ~40% of miR-155-dependent Ago binding lacked perfect seed matches, indicating direct target repression can include noncanonical binding modes. | 5p | Activated murine primary T cells | (loeb2012transcriptomewidemir155binding pages 7-8, loeb2012transcriptomewidemir155binding pages 1-2) |
| CC | RNA-induced silencing complex | Anti-Ago immunoprecipitation followed by absolute miRNA quantification demonstrated miR-155-5p and inducible miR-155-3p are present in Ago-containing RISC in primary macrophages. | 3p, 5p | Primary human monocyte-derived macrophages | (simmonds2019transientupregulationof pages 11-12, simmonds2019transientupregulationof media a21bb4f5) |
| CC | cytoplasm | In HT-29 cells, miR-155-5p knockdown decreased cytoplasmic HuR expression; the study examines miR-155-5p-mediated post-transcriptional regulation of a cytoplasmic target context, but does not directly localize miR-155 RNA itself by imaging/fractionation, so support for cytoplasmic localization of MIR155/miR-155 is indirect and should be used cautiously. | 5p | HT-29 human colon cancer cells | (alhaidari2018mir1555pcontrolscolon pages 1-7) |
| CC | P-body / stress granule | No direct primary evidence in the provided context shows MIR155/miR-155 itself localized to P-bodies or stress granules by microscopy or specific fractionation; related literature in context concerns general Ago/P-body biology or non-miR-155-specific compartmentation and is insufficient for confident annotation of MIR155 to these CC terms. | — | — | (witten2020mir155asa pages 18-19) |
| CC | extracellular vesicle | The provided context includes review-level discussion and indirect/preprint evidence for extracellular or endosomal miR-155 contexts, but no high-confidence primary evidence sufficient here to assign MIR155 a GO cellular-component annotation to extracellular vesicle for core function. | — | — | (de2020amyloidbetaoligomers pages 25-30, witten2020mir155asa pages 18-19) |
Table: This table maps proposed GO annotations for human MIR155/miR-155 to direct primary-literature evidence available in the current context. It highlights well-supported core functions and compartments while flagging localization terms that are not sufficiently supported for confident annotation.
A major recent-development theme is clinical translation of miR‑155 inhibition (anti-miR/antagomir strategies), most prominently cobomarsen (MRG‑106).
A 2024 review of miRNA therapeutics describes cobomarsen (MRG‑106) as an LNA-based antagomir of miR‑155, noting a completed phase 1 trial and that phase 2 studies were initiated but at least two phase 2 trials were terminated; it also notes that at least one termination was due to business reasons rather than safety/efficacy concerns (as per ClinicalTrials.gov, accessed 20 Dec 2023). This literature is useful for “current applications” but does not replace primary biochemical evidence for GO annotation. (seyhan2024trialsandtribulations pages 16-17)
Recent reviews increasingly emphasize miRNA localization heterogeneity (endosomes, ER-associated polysomes, etc.) and extracellular RNA transport, but miR‑155-specific localization evidence must be supported by rigorous primary experiments. A 2020 fractionation-based study (bioRxiv) describes optiprep gradient fractionation and reports measuring distribution of miR‑155 in endosomal fractions in Aβ-treated glial cells, illustrating methods that could support future GO CC annotation if replicated and validated. However, in this run, the relevant excerpt does not provide numeric outcomes sufficient to assert a specific GO CC term for MIR155 beyond RISC. (de2020amyloidbetaoligomers pages 25-30, de2020amyloidbetaoligomers pages 18-23)
ClinicalTrials.gov provides direct, citable implementation details for cobomarsen/MRG‑106 targeting miR‑155.
These trials provide real-world validation that miR‑155 can be modulated in patients, and they operationalize miR‑155’s role as a guide RNA in post-transcriptional regulation (pharmacodynamic readouts), but they do not define additional GO molecular functions beyond miRNA-mediated silencing.
| Application type | Agent/Assay | Target | Indication | Trial ID | Phase | Status | Enrollment | Route | Key endpoints/outcomes mentioned | Termination reason (if any) | Publication/registry URL | Supporting citations (context IDs) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Therapeutic | Cobomarsen (MRG-106), LNA-based anti-miR / ASO | miR-155 | Mycosis fungoides (CTCL), CLL, DLBCL, ATLL | NCT02580552 | Phase 1 | Completed | 66 | Intratumoral, subcutaneous, intravenous | Safety, tolerability, pharmacokinetics; exploratory outcomes included overall survival, miR-155-5p expression in MF skin lesions, neoplastic lymphoid-cell proportions, immune-cell subsets, Skindex-29 and pruritus measures; review sources describe early clinical improvement signals in CAILS, mSWAT, and Skindex-29 with no serious adverse events attributed to cobomarsen in early reports | Not applicable; completed study | https://clinicaltrials.gov/study/NCT02580552 ; https://doi.org/10.3390/cancers14061588 ; https://doi.org/10.3390/ijms25031469 | (NCT02580552 chunk 1, NCT02580552 chunk 2, smith2022clinicalapplicationsof pages 7-8, seyhan2024trialsandtribulations pages 16-17, witten2020mir155asa pages 14-15) |
| Therapeutic | Cobomarsen (MRG-106) vs active comparator (vorinostat) | miR-155 | Cutaneous T-cell lymphoma, mycosis fungoides | NCT03713320 | Phase 2 | Terminated | 37 | Cobomarsen: 2-hour intravenous infusion; comparator vorinostat: oral | Efficacy/safety outcomes included 50% improvement in mSWAT, pruritus medication utilization, PK endpoints (Cmax, AUC), and anti-drug antibody generation; registry states results were submitted/posted | “Terminated early for business reasons, and not due to concerns regarding safety or lack of efficacy.” | https://clinicaltrials.gov/study/NCT03713320 ; https://doi.org/10.3390/ijms25031469 | (NCT03713320 chunk 1, NCT03713320 chunk 2, seyhan2024trialsandtribulations pages 16-17) |
| Therapeutic | Cobomarsen (MRG-106) extension after SOLAR | miR-155 | Mycosis fungoides after SOLAR completion | NCT03837457 | Phase 2 | Terminated | 8 | Not available in provided context | Extension study identified in review/trial listings; no posted outcome details available in provided context | Not stated in provided context | https://clinicaltrials.gov/study/NCT03837457 ; https://doi.org/10.3390/ijms25031469 | (seyhan2024trialsandtribulations pages 16-17, piergentili2025targetingregulatorynoncoding pages 16-17) |
| Therapeutic/Translational | Cobomarsen (MRG-106) program summary in reviews | miR-155 | Lymphomas/leukemias including CTCL, CLL, DLBCL, ATLL | Program-level | Phase 1 completed; Phase 2 initiated/terminated | Mixed | — | Intratumoral, intravenous, subcutaneous reported across studies | Seyhan 2024 identifies cobomarsen as an LNA-based antagomir and notes completed phase 1 plus terminated phase 2 studies; Smith 2022 lists miRagen-sponsored ASO program and delivery routes; Witten & Slack 2020 describe reductions in miR-155 target-gene expression in biopsies and sustained improvements in lesion/quality-of-life metrics in early reports | Review states at least one terminated study ended for business reasons rather than safety/efficacy concerns | https://doi.org/10.3390/ijms25031469 ; https://doi.org/10.3390/cancers14061588 ; https://doi.org/10.1093/carcin/bgz183 | (seyhan2024trialsandtribulations pages 16-17, smith2022clinicalapplicationsof pages 7-8, witten2020mir155asa pages 13-14, witten2020mir155asa pages 14-15) |
| Diagnostic/biomarker | miR-155 expression assays / circulating or tissue miR-155 profiling | miR-155 | Hematologic malignancy and inflammatory-disease biomarker studies (observational and ancillary uses) | Multiple non-cobomarsen studies in registry | Observational / non-therapeutic | Ongoing, completed, or unknown depending on study | Varies | Biospecimen assay | Used as biomarker/prognostic or pharmacodynamic readout rather than direct therapeutic intervention; examples in provided context include lesion miR-155-5p qRT-PCR in NCT02580552 and review discussion of biomarker utility | Not applicable | https://clinicaltrials.gov/study/NCT02580552 ; https://doi.org/10.3390/ijms25031469 | (NCT02580552 chunk 2, seyhan2024trialsandtribulations pages 16-17) |
Table: This table summarizes miR-155-targeting real-world applications, focusing on cobomarsen/MRG-106 clinical development and registry-level details. It is useful for linking therapeutic and biomarker use cases to specific trial phases, statuses, routes, and reported outcomes.
Authoritative reviews in hematologic malignancy emphasize miR‑155 as an oncogenic miRNA and summarize early clinical signals from cobomarsen, including improved lesion-burden and QoL metrics and lack of serious adverse events attributed to the drug in early reports. These expert analyses support clinical interest and translational feasibility but should be treated as secondary evidence relative to primary mechanistic studies for GO annotations. (witten2020mir155asa pages 14-15)
The direct molecular function of MIR155 is Argonaute-associated guide RNA function that mediates post-transcriptional regulation (typically repression) of target RNAs. Immune activation, inflammation, and oncogenesis arise from downstream network effects of repressing many target transcripts and are better considered phenotypic consequences rather than direct GO molecular function. The dCLIP data show miR‑155 guides Ago to hundreds of sites in an endogenous, transcriptome-wide manner, supporting network-level regulatory capacity without implying new molecular activities beyond RNA-guided silencing. (loeb2012transcriptomewidemir155binding pages 7-8, loeb2012transcriptomewidemir155binding pages 2-3)
In primary human macrophages, absolute quantitation estimated mean copy numbers per cell and demonstrated inducible RISC association:
- miR‑155‑3p: ~29±11 copies/cell resting; ~767±137 copies/cell at 2 h LPS (range 446–1,134)
- miR‑155‑5p: ~1,315±417 copies/cell resting; ~5,578±1,361 copies/cell at 2 h LPS
These data are directly relevant for GO annotation because they support that miR‑155 strands reach measurable abundance and are physically present in Argonaute immunoprecipitates at biologically relevant times. (simmonds2019transientupregulationof pages 11-12)
Within the retrieved corpus, strong direct evidence exists for miR‑155 association with Argonaute/RISC and for miR‑155-guided post-transcriptional regulation. However, miR‑155-specific evidence for localization to P-bodies/stress granules or extracellular vesicles was not sufficiently explicit/quantitative in the extracted primary text to support confident GO cellular-component annotation to those compartments in this report. (witten2020mir155asa pages 18-19, de2020amyloidbetaoligomers pages 25-30)
References
(simmonds2019transientupregulationof pages 11-12): Rachel E. Simmonds. Transient up-regulation of mir-155-3p by lipopolysaccharide in primary human monocyte-derived macrophages results in risc incorporation but does not alter tnf expression. Wellcome Open Research, 4:43, Mar 2019. URL: https://doi.org/10.12688/wellcomeopenres.15065.1, doi:10.12688/wellcomeopenres.15065.1. This article has 21 citations.
(simmonds2019transientupregulationof pages 12-14): Rachel E. Simmonds. Transient up-regulation of mir-155-3p by lipopolysaccharide in primary human monocyte-derived macrophages results in risc incorporation but does not alter tnf expression. Wellcome Open Research, 4:43, Mar 2019. URL: https://doi.org/10.12688/wellcomeopenres.15065.1, doi:10.12688/wellcomeopenres.15065.1. This article has 21 citations.
(simmonds2019transientupregulationof media a21bb4f5): Rachel E. Simmonds. Transient up-regulation of mir-155-3p by lipopolysaccharide in primary human monocyte-derived macrophages results in risc incorporation but does not alter tnf expression. Wellcome Open Research, 4:43, Mar 2019. URL: https://doi.org/10.12688/wellcomeopenres.15065.1, doi:10.12688/wellcomeopenres.15065.1. This article has 21 citations.
(simmonds2019transientupregulationof media 5691fff6): Rachel E. Simmonds. Transient up-regulation of mir-155-3p by lipopolysaccharide in primary human monocyte-derived macrophages results in risc incorporation but does not alter tnf expression. Wellcome Open Research, 4:43, Mar 2019. URL: https://doi.org/10.12688/wellcomeopenres.15065.1, doi:10.12688/wellcomeopenres.15065.1. This article has 21 citations.
(alhaidari2018mir1555pcontrolscolon pages 28-29): Amr Al-Haidari, Anwar Algaber, Raed Madhi, Ingvar Syk, and Henrik Thorlacius. Mir-155-5p controls colon cancer cell migration via post-transcriptional regulation of human antigen r (hur). Cancer letters, 421:145-151, May 2018. URL: https://doi.org/10.1016/j.canlet.2018.02.026, doi:10.1016/j.canlet.2018.02.026. This article has 78 citations and is from a peer-reviewed journal.
(loeb2012transcriptomewidemir155binding pages 1-2): Gabriel B. Loeb, Aly A. Khan, David Canner, Joseph B. Hiatt, Jay Shendure, Robert B. Darnell, Christina S. Leslie, and Alexander Y. Rudensky. Transcriptome-wide mir-155 binding map reveals widespread noncanonical microrna targeting. Molecular cell, 48 5:760-70, Dec 2012. URL: https://doi.org/10.1016/j.molcel.2012.10.002, doi:10.1016/j.molcel.2012.10.002. This article has 403 citations and is from a highest quality peer-reviewed journal.
(loeb2012transcriptomewidemir155binding pages 2-3): Gabriel B. Loeb, Aly A. Khan, David Canner, Joseph B. Hiatt, Jay Shendure, Robert B. Darnell, Christina S. Leslie, and Alexander Y. Rudensky. Transcriptome-wide mir-155 binding map reveals widespread noncanonical microrna targeting. Molecular cell, 48 5:760-70, Dec 2012. URL: https://doi.org/10.1016/j.molcel.2012.10.002, doi:10.1016/j.molcel.2012.10.002. This article has 403 citations and is from a highest quality peer-reviewed journal.
(loeb2012transcriptomewidemir155binding pages 7-8): Gabriel B. Loeb, Aly A. Khan, David Canner, Joseph B. Hiatt, Jay Shendure, Robert B. Darnell, Christina S. Leslie, and Alexander Y. Rudensky. Transcriptome-wide mir-155 binding map reveals widespread noncanonical microrna targeting. Molecular cell, 48 5:760-70, Dec 2012. URL: https://doi.org/10.1016/j.molcel.2012.10.002, doi:10.1016/j.molcel.2012.10.002. This article has 403 citations and is from a highest quality peer-reviewed journal.
(loeb2012transcriptomewidemir155binding pages 6-7): Gabriel B. Loeb, Aly A. Khan, David Canner, Joseph B. Hiatt, Jay Shendure, Robert B. Darnell, Christina S. Leslie, and Alexander Y. Rudensky. Transcriptome-wide mir-155 binding map reveals widespread noncanonical microrna targeting. Molecular cell, 48 5:760-70, Dec 2012. URL: https://doi.org/10.1016/j.molcel.2012.10.002, doi:10.1016/j.molcel.2012.10.002. This article has 403 citations and is from a highest quality peer-reviewed journal.
(alhaidari2018mir1555pcontrolscolon pages 1-7): Amr Al-Haidari, Anwar Algaber, Raed Madhi, Ingvar Syk, and Henrik Thorlacius. Mir-155-5p controls colon cancer cell migration via post-transcriptional regulation of human antigen r (hur). Cancer letters, 421:145-151, May 2018. URL: https://doi.org/10.1016/j.canlet.2018.02.026, doi:10.1016/j.canlet.2018.02.026. This article has 78 citations and is from a peer-reviewed journal.
(alhaidari2018mir1555pcontrolscolon pages 7-11): Amr Al-Haidari, Anwar Algaber, Raed Madhi, Ingvar Syk, and Henrik Thorlacius. Mir-155-5p controls colon cancer cell migration via post-transcriptional regulation of human antigen r (hur). Cancer letters, 421:145-151, May 2018. URL: https://doi.org/10.1016/j.canlet.2018.02.026, doi:10.1016/j.canlet.2018.02.026. This article has 78 citations and is from a peer-reviewed journal.
(witten2020mir155asa pages 18-19): Lisa Witten and Frank J Slack. Mir-155 as a novel clinical target for hematological malignancies. Carcinogenesis, 41:2-7, Nov 2020. URL: https://doi.org/10.1093/carcin/bgz183, doi:10.1093/carcin/bgz183. This article has 119 citations and is from a peer-reviewed journal.
(de2020amyloidbetaoligomers pages 25-30): Dipayan De and Suvendra N. Bhattacharyya. Amyloid beta oligomers prevents lysosomal targeting of mirnp to stop its recycling and target cytokine repression in glial cells. bioRxiv, Dec 2020. URL: https://doi.org/10.1101/2020.12.24.424324, doi:10.1101/2020.12.24.424324. This article has 0 citations.
(seyhan2024trialsandtribulations pages 16-17): Attila A Seyhan. Trials and tribulations of microrna therapeutics. International Journal of Molecular Sciences, Jan 2024. URL: https://doi.org/10.3390/ijms25031469, doi:10.3390/ijms25031469. This article has 393 citations.
(de2020amyloidbetaoligomers pages 18-23): Dipayan De and Suvendra N. Bhattacharyya. Amyloid beta oligomers prevents lysosomal targeting of mirnp to stop its recycling and target cytokine repression in glial cells. bioRxiv, Dec 2020. URL: https://doi.org/10.1101/2020.12.24.424324, doi:10.1101/2020.12.24.424324. This article has 0 citations.
(NCT02580552 chunk 1): Safety, Tolerability and Pharmacokinetics of MRG-106 in Patients With Mycosis Fungoides (MF), CLL, DLBCL or ATLL. miRagen Therapeutics, Inc.. 2016. ClinicalTrials.gov Identifier: NCT02580552
(NCT02580552 chunk 2): Safety, Tolerability and Pharmacokinetics of MRG-106 in Patients With Mycosis Fungoides (MF), CLL, DLBCL or ATLL. miRagen Therapeutics, Inc.. 2016. ClinicalTrials.gov Identifier: NCT02580552
(NCT03713320 chunk 1): SOLAR: Efficacy and Safety of Cobomarsen (MRG-106) vs. Active Comparator in Subjects With Mycosis Fungoides. miRagen Therapeutics, Inc.. 2019. ClinicalTrials.gov Identifier: NCT03713320
(smith2022clinicalapplicationsof pages 7-8): Ellen S. Smith, Eric Whitty, Byunghee Yoo, Anna Moore, Lorenzo F. Sempere, and Zdravka Medarova. Clinical applications of short non-coding rna-based therapies in the era of precision medicine. Cancers, 14:1588, Mar 2022. URL: https://doi.org/10.3390/cancers14061588, doi:10.3390/cancers14061588. This article has 72 citations.
(witten2020mir155asa pages 14-15): Lisa Witten and Frank J Slack. Mir-155 as a novel clinical target for hematological malignancies. Carcinogenesis, 41:2-7, Nov 2020. URL: https://doi.org/10.1093/carcin/bgz183, doi:10.1093/carcin/bgz183. This article has 119 citations and is from a peer-reviewed journal.
(NCT03713320 chunk 2): SOLAR: Efficacy and Safety of Cobomarsen (MRG-106) vs. Active Comparator in Subjects With Mycosis Fungoides. miRagen Therapeutics, Inc.. 2019. ClinicalTrials.gov Identifier: NCT03713320
(piergentili2025targetingregulatorynoncoding pages 16-17): R. Piergentili and S. Sechi. Targeting regulatory noncoding rnas in human cancer: the state of the art in clinical trials. Pharmaceutics, Apr 2025. URL: https://doi.org/10.3390/pharmaceutics17040471, doi:10.3390/pharmaceutics17040471. This article has 4 citations.
(witten2020mir155asa pages 13-14): Lisa Witten and Frank J Slack. Mir-155 as a novel clinical target for hematological malignancies. Carcinogenesis, 41:2-7, Nov 2020. URL: https://doi.org/10.1093/carcin/bgz183, doi:10.1093/carcin/bgz183. This article has 119 citations and is from a peer-reviewed journal.
id: URS000062749E_9606
gene_symbol: MIR155
product_type: MIRNA
taxon:
id: NCBITaxon:9606
label: Homo sapiens
description: >-
MIR155 encodes miR-155, a microRNA whose core molecular role is to guide
Argonaute/RISC to target RNAs for miRNA-mediated post-transcriptional gene
regulation. MIR155 is important in immune responses and oncogenesis, but those
are context-specific regulatory outcomes rather than separate molecular
functions.
references:
- id: file:human/MIR155/MIR155-deep-research-falcon.md
title: Falcon deep research report for MIR155
findings:
- statement: >-
Falcon supports MIR155 as a guide RNA in Argonaute/RISC-mediated
post-transcriptional regulation and cautions against treating immune,
oncogenic, extracellular-vesicle, or stress-granule contexts as core GO
functions without direct MIR155-specific evidence.
supporting_text: >-
Strong direct evidence exists for miR-155 association with Argonaute/RISC
and for miR-155-guided post-transcriptional regulation.
- id: PMID:23416982
title: MiR-155 at the heart of oncogenic pathways
- id: PMID:34626873
title: MicroRNA-155 and antiviral immune responses
- id: GO_REF:0000115
title: Gene Ontology annotation based on Rfam2GO mapping
findings: []
existing_annotations:
- term:
id: GO:0035195
label: miRNA-mediated post-transcriptional gene silencing
evidence_type: IEA
original_reference_id: GO_REF:0000115
review:
summary: RNAcentral/Rfam annotation for the primary biological process that MIR155 participates in.
action: ACCEPT
reason: MIR155 is a microRNA precursor and its mature product participates in miRNA-mediated post-transcriptional gene silencing.
supported_by:
- reference_id: PMID:23416982
supporting_text: "MicroRNA-155 (miR-155) is an established oncomiR in breast
cancer and regulates several pro-oncogenic pathways."
- reference_id: file:human/MIR155/MIR155-deep-research-falcon.md
supporting_text: >-
Differential Ago HITS-CLIP/dCLIP comparing WT and miR-155-knockout
activated CD4+ T cells identified miR-155-dependent Ago-binding sites,
supporting miR-155-mediated post-transcriptional silencing.
- term:
id: GO:0016442
label: RISC complex
evidence_type: IEA
original_reference_id: GO_REF:0000115
review:
summary: RNAcentral/Rfam annotation placing MIR155 in the RNA-induced silencing complex context.
action: ACCEPT
reason: Mature miRNAs guide RISC-mediated target repression, so this RNAcentral annotation is consistent with MIR155 biology.
supported_by:
- reference_id: file:human/MIR155/MIR155-deep-research-falcon.md
supporting_text: >-
Direct Argonaute immunoprecipitation in human macrophages provides
strong evidence that miR-155 strands are physically present in
Argonaute/RISC complexes.
- term:
id: GO:0003730
label: mRNA 3'-UTR binding
evidence_type: NAS
review:
summary: >-
Added to align the core MIR155 molecular function with the annotation
block. Mature miR-155 guides Argonaute/RISC to target RNAs, with target
recognition mediated by base-pairing to sites that include mRNA 3'-UTRs.
action: NEW
reason: >-
Falcon found direct evidence for miR-155-dependent Argonaute occupancy at
target sites, supporting the core mRNA 3'-UTR binding function used in the
core_functions block.
supported_by:
- reference_id: file:human/MIR155/MIR155-deep-research-falcon.md
supporting_text: >-
Differential Ago HITS-CLIP/dCLIP comparing WT and miR-155-knockout
activated CD4+ T cells identified miR-155-dependent Ago-binding sites.
core_functions:
- description: miRNA guide RNA activity in Argonaute/RISC-mediated post-transcriptional gene silencing
molecular_function:
id: GO:0003730
label: mRNA 3'-UTR binding
directly_involved_in:
- id: GO:0035195
label: miRNA-mediated post-transcriptional gene silencing
in_complex:
id: GO:0016442
label: RISC complex
supported_by:
- reference_id: file:human/MIR155/MIR155-deep-research-falcon.md
supporting_text: >-
Strong direct evidence exists for miR-155 association with Argonaute/RISC
and for miR-155-guided post-transcriptional regulation.
suggested_questions:
- question: What are the complete set of target mRNAs regulated by MIR155 in
different cell types?
experts:
- microRNA researchers
- cancer biologists
- question: How does MIR155 expression change during immune cell activation and
differentiation?
experts:
- immunologists
- T cell biologists
suggested_experiments:
- description: CLIP-seq analysis to identify direct MIR155 target sites
experiment_type: high-throughput sequencing
hypothesis: MIR155 directly binds to specific sequences in target mRNAs
- description: Single-cell RNA-seq of immune cells with MIR155 knockdown
experiment_type: single-cell analysis
hypothesis: MIR155 regulates immune cell differentiation programs
status: COMPLETE