Affinage

MARF1

Meiosis regulator and mRNA stability factor 1 · UniProt Q9Y4F3

Length
1742 aa
Mass
192.9 kDa
Annotated
2026-06-10
11 papers in source corpus 10 papers cited in narrative 10 extracted findings
Cross-family judge vs UniProt: Affinage preferred faithfulness: 7/7 claims corpus-supported (100%)

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

MARF1 is a cytoplasmic endoribonuclease that post-transcriptionally silences target mRNAs and thereby governs meiotic progression, genome integrity, and tissue-specific gene expression programs (PMID:22442484, PMID:30364987). Its catalytic activity resides in an N-terminal NYN domain whose four conserved aspartates (D178, D215, D246, D272) are required for RNA cleavage in vitro and for function in vivo, where a D272A knock-in causes female infertility with failure of meiotic resumption (PMID:30333187). Target recognition is mediated by LOTUS domains that bind RNA and engage targets predominantly at their 3' UTRs, while an RRM domain enhances endonuclease activity (PMID:30333187, PMID:32510323). In oocytes, MARF1-mediated degradation suppresses PPP2CB and IAP/LINE1 retrotransposon transcripts, preventing aberrant meiotic arrest and limiting DNA double-strand breaks (PMID:22442484, PMID:30333187). In somatic cells MARF1 physically recruits the DCP1:DCP2 decapping complex, but not deadenylation factors, to promote decay of its targets (PMID:30364987). MARF1 activity is antagonized by EDC4, which binds via a short linear motif that competes with XRN1 and blocks LOTUS-domain access to target mRNAs, and by P-body sequestration that withholds MARF1 from its substrates (PMID:32510323, PMID:35801873). Beyond oogenesis, the somatic isoform drives cortical neuronal differentiation in an RNase-dependent manner (PMID:28442784), and a MARF1-L splice isoform promotes radioresistance by degrading PPP1R10 to activate Chk1-dependent homologous recombination repair in oral squamous cell carcinoma (PMID:41864998).

Mechanistic history

Synthesis pass · year-by-year structured walk · 9 steps
  1. 2012 High

    Established MARF1 as a required suppressor of specific oocyte transcripts, linking it to meiotic competence and genome protection before any molecular activity was known.

    Evidence Mouse genetic loss-of-function with mRNA/protein and phenotypic analysis of meiotic arrest and retrotransposon levels

    PMID:22442484 PMID:23090997

    Open questions at the time
    • Did not define the molecular activity (nuclease vs adaptor) responsible for suppression
    • Whether PPP2CB and retrotransposon mRNAs are direct targets was not established
    • Mechanism of transcript selection unknown
  2. 2018 High

    Resolved that MARF1 is itself the catalytic engine, defining an NYN-domain endoribonuclease whose active-site aspartates and LOTUS RNA-binding are essential in vitro and in vivo.

    Evidence Crystal structures of NYN and LOTUS domains, in vitro nuclease assays with recombinant protein, active-site mutagenesis, and a D272A knock-in mouse

    PMID:30333187

    Open questions at the time
    • Sequence/structural determinants of target selectivity not mapped
    • Did not address coupling to downstream decay machinery
    • Cofactor or regulatory inputs unknown
  3. 2018 High

    Showed MARF1 couples its endonucleolytic cleavage to a defined decay route by recruiting the DCP1:DCP2 decapping complex rather than deadenylation factors, placing it in a discrete mRNA turnover pathway.

    Evidence 1.7 A crystal structure of human NYN domain, in vitro nuclease assay, mutagenesis, co-IP with decapping and deadenylation factors, reporter decay assays

    PMID:30364987

    Open questions at the time
    • Stoichiometry and structural basis of the MARF1–DCP1:DCP2 interaction not resolved
    • Whether decapping recruitment is required for all targets unclear
  4. 2018 Medium

    Demonstrated that the MARF1 C-terminus is required for fidelity of homolog segregation, separating regulatory/targeting functions from catalysis in the meiotic phenotype.

    Evidence Marf1-eGFP knock-in mouse with analysis of spindle integrity, meiotic timing, and aneuploidy

    PMID:29353819

    Open questions at the time
    • Mechanism by which the C-terminal domain action operates not fully resolved
    • Single lab, single approach
    • Direct targets responsible for segregation fidelity not identified
  5. 2020 High

    Defined the transcriptome-wide target landscape and a negative regulator, showing LOTUS-domain 3' UTR binding selects targets, the RRM enhances cleavage, and EDC4 inhibits MARF1 by blocking LOTUS–mRNA engagement.

    Evidence Transcriptome-wide target mapping, LOTUS/RRM domain mutagenesis, EDC4 co-IP, and decay reporter assays

    PMID:32510323

    Open questions at the time
    • Sequence/structure features driving 3' UTR target choice not defined
    • How RRM mechanistically enhances catalysis unresolved
  6. 2020 Medium

    Extended the conserved function to a translational-repression mode in Drosophila, where dMarf1 binds nanos mRNA to control the meiosis I-to-II transition via CycB/Cdk1.

    Evidence dMarf1 loss-of-function allele, Myc-dMarf1 immunoprecipitation of bound mRNAs, domain-deletion rescue, and Nos/CycB immunostaining

    PMID:32243476

    Open questions at the time
    • Whether dMarf1 cleaves or only translationally represses nanos not distinguished
    • Conservation of nanos regulation in mammals not addressed
    • Single lab, ortholog model
  7. 2022 Medium

    Showed MARF1 regulation is set by competitive EDC4 binding and by P-body architecture, establishing spatial sequestration as a mechanism antagonizing MARF1-mediated decay.

    Evidence Short-linear-motif mutagenesis in MARF1 and XRN1, co-IP, P-body disruption, and decay reporter assays

    PMID:35801873

    Open questions at the time
    • The additional factor beyond EDC4 binding needed for full inhibition not identified
    • How P-body partitioning is dynamically controlled unknown
    • Single lab
  8. 2017 Medium

    Identified a somatic role outside the germline, showing a somatic MARF1 isoform drives cortical neuronal differentiation through its RNase domain.

    Evidence In utero electroporation and progenitor overexpression/knockdown with RNase-domain deletion rescue

    PMID:28442784

    Open questions at the time
    • Neuronal mRNA targets not identified
    • Whether decapping recruitment operates in this context untested
    • Single lab
  9. 2026 Medium

    Linked MARF1 isoform choice to a disease-relevant DNA-repair output, with a splicing-regulated MARF1-L isoform degrading PPP1R10 to activate Chk1 and homologous recombination, conferring radioresistance.

    Evidence hnRNPA1–SF3B3 co-IP, RNA-seq splicing analysis, isoform knockdown/overexpression, clonogenic and xenograft assays, and PPP1R10/Chk1 pathway analysis

    PMID:41864998

    Open questions at the time
    • Whether PPP1R10 is a direct NYN-cleaved target not formally shown
    • Generality of MARF1-L radioresistance beyond oral squamous cell carcinoma untested
    • Single lab

Open questions

Synthesis pass · forward-looking unresolved questions
  • How MARF1 selects specific 3' UTR targets across tissues, and how its dual modes (endonucleolytic decay with decapping recruitment vs translational repression) are switched, remains unresolved.
  • No consensus cis-element or structural rule for target recognition defined
  • Mechanism switching MARF1 between cleavage and translational repression unknown
  • Structural basis of decapping-complex recruitment unresolved

Mechanism profile

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0140098 catalytic activity, acting on RNA 3 GO:0003723 RNA binding 2 GO:0016787 hydrolase activity 2
Localization
GO:0005829 cytosol 1
Pathway
R-HSA-1474165 Reproduction 2 R-HSA-8953854 Metabolism of RNA 2
Partners
DCP1DCP2EDC4XRN1

Evidence

Reading pass · 10 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
2012 MARF1 is required for suppression of specific transcripts in mouse oocytes, including PPP2CB (protein phosphatase 2 catalytic subunit) and IAP/LINE1 retrotransposon mRNAs; loss of MARF1 causes up-regulation of PPP2CB which is key to the meiotic arrest phenotype, and elevated DNA double-strand breaks in oocytes. Mouse genetic loss-of-function (Marf1 mutation), mRNA and protein expression analysis, phenotypic characterization of meiotic arrest and retrotransposon up-regulation Science High 22442484
2012 MARF1 protein domains include structural and functional analogies to nuage-associated components (PIWI and TDRD5/7) in spermatocytes, suggesting MARF1 combines retrotransposon silencing and meiotic regulation functions in a single molecule in oocytes; MARF1 expression was characterized across oocyte developmental stages. Domain architecture comparison, developmental expression profiling, genetic loss-of-function analysis of retrotransposon silencing and DNA double-strand break accumulation Proceedings of the National Academy of Sciences of the United States of America Medium 23090997
2018 MARF1 possesses an N-terminal NYN domain with ribonuclease activity dependent on four conserved aspartate residues (D178, D215, D246, D272); the C-terminal LOTUS domain adopts a winged helix-turn-helix fold and binds ssRNA and dsRNA. Purified MARF1 cleaves ssRNA in vitro; mutations of conserved aspartates or LOTUS domain truncation abolish cleavage. In vivo, a D272A point mutation causes female infertility with failure of meiotic resumption and elevated retrotransposon transcripts and DNA double-strand breaks. Crystal structure determination of NYN and LOTUS domains, in vitro ribonuclease assay with purified recombinant MARF1, active-site mutagenesis (D178A, D215A, D246A, D272A), LOTUS truncation, in vivo knock-in mouse with D272A mutation Proceedings of the National Academy of Sciences of the United States of America High 30333187
2018 Human MARF1 is a cytoplasmic endoribonuclease that post-transcriptionally silences targeted mRNAs; its NYN domain (1.7 Å crystal structure resolved) is a bona fide endoribonuclease whose activity is essential for repression of target mRNAs. MARF1 physically interacts with the DCP1:DCP2 mRNA decapping complex (but not with deadenylation machinery), recruiting it to target mRNAs. 1.7 Å crystal structure of human MARF1 NYN domain, in vitro endoribonuclease assay, NYN domain mutagenesis, co-immunoprecipitation with DCP1:DCP2 and deadenylation factors, reporter mRNA decay assays Nucleic acids research High 30364987
2018 Interference with the C-terminal structure of MARF1 (by eGFP fusion knock-in) causes delayed meiotic reinitiation, accelerated meiotic completion, increased oocyte aneuploidy, and female infertility, demonstrating that MARF1 C-terminal domains are required for fidelity of homolog segregation during oocyte maturation. Marf1-eGFP knock-in mouse model, analysis of meiotic spindle integrity, meiotic timing, and aneuploidy rates in KI oocytes Journal of biomedical research Medium 29353819
2020 EDC4 interacts with MARF1 and impairs its activity by preventing MARF1 LOTUS domains from binding target mRNAs; transcriptome-wide analysis identified MARF1 target mRNAs as predominantly bound at their 3' UTRs via LOTUS domains. An RRM domain of MARF1 plays an essential role in enhancing its endonuclease activity. Transcriptome-wide MARF1 target identification (CLIP/RNA-seq), domain deletion/mutation analysis of LOTUS and RRM domains, EDC4 co-immunoprecipitation, mRNA decay reporter assays eLife High 32510323
2020 Drosophila MARF1 (dMarf1) binds nanos mRNA and translationally represses Nos protein expression during late oogenesis; loss of dMarf1 causes persistent high Nos levels, which suppresses cyclin B expression and impairs CycB/Cdk1 complex activation, blocking the meiosis I to II transition. OST/RRM motifs and 47 conserved C-terminal residues are required for dMarf1 function. dMarf1 loss-of-function allele in Drosophila, immunoprecipitation of Myc-dMarf1 to identify bound mRNAs, transgenic rescue with domain-deletion constructs, immunostaining of Nos and CycB protein levels PloS one Medium 32243476
2022 Human MARF1 and XRN1 interact with EDC4 via analogous conserved short linear motifs in a mutually exclusive manner; the EDC4-MARF1 interaction is required but not sufficient for EDC4 to inhibit MARF1 activity. P-body architecture itself plays a critical role in antagonizing MARF1-mediated mRNA decay by sequestering MARF1 and preventing it from accessing and degrading target mRNAs. Mutagenesis of short linear motifs in MARF1 and XRN1, co-immunoprecipitation, P-body disruption experiments, mRNA decay reporter assays Nucleic acids research Medium 35801873
2017 The somatic form of MARF1 (sMARF1) promotes cortical neuronal differentiation in vitro and in vivo; the RNase domain of sMARF1 is required for its effects on cortical neurogenesis, as an RNase domain deletion mutant fails to rescue the neurogenesis phenotype. In utero electroporation for in vivo overexpression/knockdown, in vitro neuronal progenitor overexpression/knockdown, RNase domain deletion mutant functional rescue assay Scientific reports Medium 28442784
2026 The MARF1-L splicing isoform (promoted by hnRNPA1-SF3B3 interaction inhibiting exon 8 skipping) enhances radioresistance by degrading PPP1R10, a negative regulator of Chk1, thereby activating homologous recombination repair in oral squamous cell carcinoma cells. Co-immunoprecipitation (hnRNPA1-SF3B3 interaction), RNA-sequencing for splicing analysis, knockdown/overexpression of hnRNPA1 and MARF1 isoforms, clonogenic survival assay, xenograft assay, analysis of PPP1R10 and Chk1 pathway Journal of experimental & clinical cancer research Medium 41864998

Source papers

Stage 0 corpus · 11 papers · ranked by NIH iCite citations
Year Title Journal Citations PMID
2012 MARF1 regulates essential oogenic processes in mice. Science (New York, N.Y.) 83 22442484
2012 Meiosis arrest female 1 (MARF1) has nuage-like function in mammalian oocytes. Proceedings of the National Academy of Sciences of the United States of America 46 23090997
2018 Ribonuclease activity of MARF1 controls oocyte RNA homeostasis and genome integrity in mice. Proceedings of the National Academy of Sciences of the United States of America 36 30333187
2018 Human MARF1 is an endoribonuclease that interacts with the DCP1:2 decapping complex and degrades target mRNAs. Nucleic acids research 24 30364987
2022 P-bodies directly regulate MARF1-mediated mRNA decay in human cells. Nucleic acids research 16 35801873
2020 A non-canonical role for the EDC4 decapping factor in regulating MARF1-mediated mRNA decay. eLife 13 32510323
2017 The RNA-binding protein MARF1 promotes cortical neurogenesis through its RNase activity domain. Scientific reports 13 28442784
2020 Drosophila MARF1 ensures proper oocyte maturation by regulating nanos expression. PloS one 11 32243476
2018 Interference with the C-terminal structure of MARF1 causes defective oocyte meiotic division and female infertility in mice. Journal of biomedical research 8 29353819
2026 hnRNPA1-SF3B3 interaction drives radioresistance in oral squamous cell carcinoma by modulating MARF1 alternative splicing isoforms. Journal of experimental & clinical cancer research : CR 0 41864998
2021 A Cell-Free System for Investigating Human MARF1 Endonuclease Activity. Methods in molecular biology (Clifton, N.J.) 0 33201479

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