{"gene":"SLC25A37","run_date":"2026-04-28T20:42:07","timeline":{"discoveries":[{"year":2006,"finding":"SLC25A37 (mitoferrin/Mfrn1) functions as the principal mitochondrial iron importer essential for heme biosynthesis in vertebrate erythroblasts; loss-of-function in zebrafish (frascati mutant) causes hypochromic anemia and erythroid maturation arrest with severely impaired 55Fe incorporation into heme, and murine Mfrn1 rescues the zebrafish defect while zebrafish mfrn1 complements yeast mrs3/mrs4 mutants.","method":"Positional cloning, 55Fe incorporation assay in Mfrn1-null murine erythroblasts derived from embryonic stem cells, cross-species complementation (zebrafish rescue and yeast complementation)","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including genetic rescue, functional iron transport assay, and cross-species complementation; foundational paper replicated by subsequent work","pmids":["16511496"],"is_preprint":false},{"year":2009,"finding":"Mfrn1 (SLC25A37) physically interacts with Abcb10 (a mitochondrial inner membrane ABC transporter) at its N-terminal domain; Abcb10 stabilizes Mfrn1 protein and enhances Mfrn1-dependent mitochondrial iron importation in erythroid cells.","method":"In vivo epitope-tagging affinity purification and mass spectrometry, co-immunoprecipitation, protein half-life measurement, cotransfection in COS7 and MEL cells, domain mapping","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP with endogenous proteins, MS identification, functional rescue, domain mapping; replicated in heterologous cell system","pmids":["19805291"],"is_preprint":false},{"year":2010,"finding":"Ferrochelatase (Fech), the terminal heme synthesis enzyme, physically interacts with Mfrn1 and Abcb10 to form an oligomeric complex in erythroid mitochondria, coupling mitochondrial iron importation to heme biosynthesis.","method":"Affinity purification and mass spectrometry from stable FLAG-tagged MEL cell clones, co-immunoprecipitation/Western blot with endogenous proteins in MEL cells and heterologous HEK293 cells","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP confirmed with endogenous proteins and in heterologous system, MS identification; builds directly on prior mechanistic work","pmids":["20427704"],"is_preprint":false},{"year":2011,"finding":"Total deletion of Mfrn1 in mouse embryos causes embryonic lethality; selective deletion in adult hematopoietic tissues causes severe anemia due to erythroblast formation deficit; deletion in hepatocytes under conditions of increased porphyrin synthesis leads to protoporphyria, cholestasis, and bridging cirrhosis due to inability to convert protoporphyrin IX to heme.","method":"Conditional and total Mfrn1 knockout mouse models, hematopoietic tissue-specific and hepatocyte-specific Cre-mediated deletion, biochemical and histological phenotyping","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — clean tissue-specific KO with defined cellular and biochemical phenotypes in multiple tissues","pmids":["21310927"],"is_preprint":false},{"year":2011,"finding":"GATA-1 directly regulates Mfrn1 (SLC25A37) transcription during erythroid maturation through cis-regulatory modules (CRMs) containing GATA-binding elements; mutagenesis of individual GATA-1 binding elements showed at least two of three are required for GATA-mediated Mfrn1 transcription. ChIP assays demonstrate switching from GATA-2 to GATA-1 at these elements during erythroid maturation.","method":"Genome-wide ChIP for GATA-1, zebrafish transgenesis with CRM-reporter constructs, morpholino knockdown, GATA-binding element mutagenesis, ChIP assays in differentiating cells","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — direct ChIP, in vivo reporter assays, and mutagenesis providing mechanistic detail on transcriptional regulation","pmids":["21248200"],"is_preprint":false},{"year":2014,"finding":"Iron regulatory protein-1 (IRP1) protects against protoporphyrin accumulation in Mfrn1-deficient erythroid cells by binding the 5'-IRE of alas2 mRNA to inhibit its translation; Mfrn1/Irp1 double-mutant erythroid cells show significantly increased protoporphyrin levels, and ectopic alas2 with a mutant IRE phenocopies IRP1 deficiency.","method":"Gene trap mouse model (Mfrn1+/gt;Irp1-/-), protoporphyrin measurements, IRE mutagenesis, ectopic alas2 expression, epistasis analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with multiple mutant combinations and molecular rescue; clean mechanistic pathway placement","pmids":["24509859"],"is_preprint":false},{"year":2014,"finding":"SF3B1 mutations in myelodysplastic syndrome with ring sideroblasts lead to higher expression of a specific retained-intron isoform of SLC25A37, contributing to mitochondrial iron overload without changing iron valence (Fe2+ retained in both mutant and wild-type).","method":"RNA sequencing, RT-PCR, transmission electron microscopy/spectroscopy, flow cytometry for iron measurement in patient samples","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 2-3 — patient sample RNA-seq and iron measurement, but no functional rescue; single lab","pmids":["24854990"],"is_preprint":false},{"year":2018,"finding":"Mfrn1 (SLC25A37) transports Fe(II) with micromolar affinity and can also transport Mn(II), Co(II), Cu, and Zn but discriminates against Ni and alkali divalent ions; it transports free iron rather than chelated iron complexes. Multiple residues with side chains capable of coordinating first-row transition metals are critical for metal binding and/or transport activity.","method":"Recombinant protein purification under non-denaturing conditions, isothermal titration calorimetry, in vitro reconstitution into defined liposomes, iron transport assay, extensive site-directed mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution of transport activity combined with ITC binding measurements and extensive mutagenesis; multiple orthogonal methods in single study","pmids":["29305420"],"is_preprint":false},{"year":2018,"finding":"PINK1-PARK2 pathway-mediated autophagic degradation of SLC25A37 (and SLC25A28) suppresses mitochondrial iron accumulation; depletion of Pink1 and Park2 leads to increased SLC25A37 levels, mitochondrial iron accumulation, HIF1A-dependent Warburg effect, and AIM2-dependent inflammasome activation promoting pancreatic tumorigenesis.","method":"Spontaneous pancreatic cancer mouse models (Pink1/Park2 knockout with mutant Kras), western blot, genetic rescue, pharmacological iron chelation, genetic depletion of Hif1a and Aim2","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic KO models with orthogonal pharmacological and genetic interventions; pathway placement established through epistasis","pmids":["30100261"],"is_preprint":false},{"year":2016,"finding":"SLC25A37 expression in erythroid cells is controlled by a super-enhancer; CRISPR/Cas9-mediated genomic editing of constituent enhancers within this super-enhancer revealed functional hierarchy among elements including some with opposing activities that cooperate to coordinate transcription.","method":"CRISPR/Cas9 in situ enhancer editing, chromatin profiling, GATA transcription factor occupancy ChIP","journal":"Developmental cell","confidence":"Medium","confidence_rationale":"Tier 2 — direct enhancer editing by CRISPR/Cas9 but functional characterization of SLC25A37 regulation is part of a broader study","pmids":["26766440"],"is_preprint":false},{"year":2020,"finding":"Both Mfrn1 (SLC25A37) and Mfrn2 are required for liver regeneration and cell proliferation; double knockout of Mfrn1 and Mfrn2 in hepatocytes resulted in 40% reduction in mitochondrial iron and reduced OXPHOS proteins; bone marrow-derived macrophages or skin fibroblasts lacking both mitoferrins cannot proliferate, and overexpression of Mfrn1-GFP or Mfrn2-GFP rescues this defect.","method":"Hepatocyte-specific and hematopoietic-specific conditional knockout mice, mitochondrial iron measurement, OXPHOS protein quantification, proliferation assay, overexpression rescue in primary cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — tissue-specific KO with functional rescue by overexpression; multiple cell types and in vivo liver regeneration assay","pmids":["32518166"],"is_preprint":false},{"year":2022,"finding":"SLC25A37 (A37) and SLC25A39 have a genetic buffering (synthetic lethal) interaction; A37-mediated mitochondrial iron uptake and A39-mediated mitochondrial glutathione import jointly support mitochondrial OXPHOS, as revealed by combinatorial CRISPR screening.","method":"Pooled dual CRISPR knockout screening across four metabolic states, mitochondrial metabolite profiling, organelle transport assays, structure-guided mutagenesis of SLC25A39","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — genome-wide combinatorial genetic screen with orthogonal metabolite profiling and transport assays; rigorous GxG interaction study","pmids":["35513392"],"is_preprint":false},{"year":2021,"finding":"ENO1 suppresses Mfrn1 expression by recruiting CNOT6 to accelerate IRP1 mRNA decay, thereby reducing mitochondrial iron import; knockdown of IRP1 reduces Mfrn1 expression and suppresses mitochondrial iron-induced ferroptosis in HCC cells, placing Mfrn1 downstream of the ENO1-IRP1 axis.","method":"RNA-binding protein assay (ENO1 as RBP), mRNA stability assay, IRP1 knockdown, Mfrn1 expression measurement, in vitro and in vivo ferroptosis assays","journal":"Nature cancer","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods establishing ENO1-IRP1-Mfrn1 pathway with functional ferroptosis readout; in vitro and in vivo validation","pmids":["35121990"],"is_preprint":false},{"year":2023,"finding":"Synaptic activity transcriptionally induces Mfrn1 expression via CREB, leading to enhanced mitochondrial iron uptake that boosts mitochondrial bioenergetics beyond the duration of synaptic activity; iron chelation or Mfrn1 knockdown blocks this activity-mediated bioenergetics increase in neurons.","method":"Neuronal activity induction assay, Mfrn1 knockdown (RNAi), iron chelation, mitochondrial bioenergetics measurement, CREB reporter and ChIP","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2-3 — KD with bioenergetics readout and CREB mechanistic link, but single lab study","pmids":["36674431"],"is_preprint":false},{"year":2023,"finding":"Mfrn1 (SLC25A37) knockdown decreases ferroptosis and mitochondrial iron accumulation in hepatocytes, while Mfrn1 overexpression exacerbates ferroptosis; lower Mfrn1 expression in female hepatocytes (compared to male) accounts in part for sexual dimorphism in ferroptosis susceptibility.","method":"Mfrn1 knockdown in HepG2 cells, ferroptosis induction assays, mitochondrial Fe2+ measurement, sex hormone manipulation (ovariectomy)","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2-3 — KD/OE with specific ferroptosis phenotype and mitochondrial iron measurement; mechanism partially established","pmids":["37741044"],"is_preprint":false},{"year":2024,"finding":"DACH1 promotes p53 phosphorylation at serine 392 and mitochondrial translocation of p53, which then binds SLC25A37 to enhance its iron uptake capacity, causing mitochondrial iron overload and ferroptosis; mutation of p53 Ser392 prevents DACH1-p53 interaction and SLC25A37-mediated ferroptosis. Knockdown of SLC25A37 impairs p53-mediated mitochondrial iron overload and ferroptosis in hepatic stellate cells.","method":"CRISPR-Cas9 DACH1 knockout, immunoprecipitation, GST pulldown, p53 Ser392 mutagenesis, subcellular fractionation, mitochondrial iron measurement, mouse hepatic fibrosis model with HSC-specific knockdowns","journal":"Hepatology communications","confidence":"High","confidence_rationale":"Tier 1-2 — Co-IP, pulldown, mutagenesis, subcellular fractionation, and in vivo mouse model with tissue-specific knockdowns; multiple orthogonal methods","pmids":["38437058"],"is_preprint":false},{"year":2023,"finding":"Mfrn1 overexpression in glioma cells increases mitochondrial iron levels, enhances cell proliferation and anchorage-independent growth, decreases mouse survival in orthotopic glioma, and upregulates glutathione, protecting glioma cells from 4-hydroxynonenal-induced protein damage.","method":"Mfrn1 overexpression in glioma cell lines, mitochondrial iron measurement, proliferation and anchorage-independent growth assays, orthotopic mouse model, glutathione measurement","journal":"Antioxidants (Basel, Switzerland)","confidence":"Medium","confidence_rationale":"Tier 2-3 — overexpression with multiple phenotypic readouts including in vivo; mechanism linked to glutathione pathway","pmids":["36829908"],"is_preprint":false},{"year":2025,"finding":"Mitochondrial iron transport via Mfrn1 is essential for erythroid cell cycle progression; mfrn1-deficient zebrafish embryos show erythroid cell cycle arrest at G2/M with enlarged nuclei suggesting a mitotic defect; iron supplementation rescues the cell cycle defect, and the proliferative defect is specific to terminally differentiating erythroid cells.","method":"Zebrafish mfrn1 mutants, iron supplementation rescue, single-cell RNA sequencing, FACS with erythroid reporter lines (cd41, gata1), cell cycle analysis","journal":"Blood advances","confidence":"High","confidence_rationale":"Tier 2 — genetic mutant with specific cell cycle phenotype, iron rescue, scRNA-seq, and reporter-based cell sorting; multiple orthogonal methods","pmids":["40601908"],"is_preprint":false},{"year":2015,"finding":"Depletion of Mfrn1 and Mfrn2 in 3T3-L1 preadipocytes impairs biosynthesis of iron-sulfur proteins due to reduced mitochondrial iron content, decreases mitochondrial oxygen consumption rate and ATP levels, reduces expression of adipogenic genes, impairs lipid production during adipogenic differentiation, and decreases insulin-induced glucose uptake and Akt phosphorylation.","method":"Double knockdown of Mfrn1 and Mfrn2 by RNAi in 3T3-L1 cells, mitochondrial iron measurement, oxygen consumption rate (Seahorse), ATP assay, adipogenesis assay, insulin signaling assay","journal":"Free radical research","confidence":"Medium","confidence_rationale":"Tier 2-3 — double knockdown with multiple functional readouts; single lab but multiple assays establishing metabolic role","pmids":["26118715"],"is_preprint":false},{"year":2020,"finding":"Knockdown of SLC25A37 in osteosarcoma cells decreases ROS production, implicating Mfrn1-mediated mitochondrial iron import in iron-induced ROS generation that promotes the Warburg effect and carcinogenesis.","method":"shRNA stable knockdown of SLC25A37, ROS measurement (DCFH-DA), Seahorse respirometry, cell proliferation and carcinogenesis assays","journal":"Cancer cell international","confidence":"Low","confidence_rationale":"Tier 3 — KD with ROS and metabolic phenotype but limited mechanistic depth; single lab","pmids":["32831652"],"is_preprint":false},{"year":2025,"finding":"SLC25A37 (Mfrn1) is required for neutrophil oxidative phosphorylation, NET formation, and type I IFN production downstream of TLR9; CRISPR targeting of SLC25A37 in a neutrophil differentiation platform disrupted this metabolic-immune circuit.","method":"Targeted CRISPR-Cas9 screen in CD34+-derived neutrophils, NET formation assay, IFN production measurement, TLR9 stimulation, OXPHOS measurement","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 2-3 — CRISPR screen with functional readouts but preprint, single study, no independent replication","pmids":[],"is_preprint":true},{"year":2024,"finding":"MFRN1 knockout in mouse embryonic fibroblasts causes more intense mitochondrial Fe(II) deficiency than SFXN3 knockout, confirming Mfrn1 as the dominant mitochondrial iron importer in non-erythroid cells; Mfrn1 KO also results in insufficient mitochondrial heme synthesis under iron overload.","method":"MFRN1 knockout in mouse embryonic fibroblasts, mitochondrial catalytic Fe(II) measurement, heme synthesis assay, comparison with SFXN3 KO","journal":"Free radical research","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with defined iron measurement phenotype; comparison with parallel KO establishes relative contribution","pmids":["38599240"],"is_preprint":false},{"year":2025,"finding":"Mfrn1 knockdown in MCAO/R rat model suppresses ferroptosis, reduces mitochondrial iron accumulation and mitochondrial damage, and reduces AIS-related injury; overexpression of Mfrn1 exacerbates all these effects, establishing Mfrn1 as a promoter of mitochondrial iron overload and ferroptotic damage in acute ischemic stroke.","method":"RNAi knockdown and AAV9-mediated overexpression in vitro (OGD/R) and in vivo (MCAO/R rat), mitochondrial iron measurement, ferroptosis markers, RNA sequencing","journal":"International immunopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 — bidirectional manipulation (KD and OE) with specific phenotypic readouts in vitro and in vivo; single lab","pmids":["40199135"],"is_preprint":false},{"year":2001,"finding":"The murine SLC25A37 (Mscp) gene encodes a protein with six transmembrane domains and three mitochondrial energy-transfer protein signature motifs characteristic of the mitochondrial carrier family, sharing 50% identity with C. elegans T26089 and ~40% with yeast MRS3/MRS4; its mRNA is highly expressed in spleen and rapidly decreases at 4-5 weeks of age during splenic lymphocyte maturation.","method":"cDNA cloning, Northern blot analysis, sequence homology analysis, cDNA microarray","journal":"Mammalian genome : official journal of the International Mammalian Genome Society","confidence":"Low","confidence_rationale":"Tier 3-4 — cloning and expression characterization without functional assay; establishes domain architecture","pmids":["11845285"],"is_preprint":false}],"current_model":"SLC25A37 (mitoferrin-1/Mfrn1) is a mitochondrial inner membrane carrier that imports Fe(II) directly (free iron, not chelated) into the mitochondrial matrix to fuel heme biosynthesis and iron-sulfur cluster assembly; it forms an oligomeric complex with Abcb10 (which stabilizes Mfrn1 protein via its N-terminal domain) and ferrochelatase to couple iron import to heme synthesis, is transcriptionally driven in erythroid cells by GATA-1 through defined super-enhancer elements, is post-translationally degraded via the PINK1-PARK2 mitophagy pathway, can be functionally enhanced by p53 binding (promoted by DACH1-mediated Ser392 phosphorylation), and is essential for erythroid cell cycle progression at G2/M, liver regeneration, adipogenic differentiation, and mitochondrial OXPHOS in proliferating cells, while its activity is buffered by the SLC25A39 glutathione transporter for OXPHOS support."},"narrative":{"teleology":[{"year":2001,"claim":"Initial cloning established SLC25A37 as a member of the mitochondrial carrier family with six transmembrane domains and three energy-transfer signature motifs, but its transported substrate was unknown.","evidence":"cDNA cloning, Northern blot, and sequence homology to yeast MRS3/MRS4 in mouse tissues","pmids":["11845285"],"confidence":"Low","gaps":["No transport substrate identified","No functional assay performed","Expression data limited to Northern blot"]},{"year":2006,"claim":"Positional cloning of the zebrafish frascati mutant identified SLC25A37 as the principal mitochondrial iron importer required for heme biosynthesis, resolving the long-standing question of how iron enters mitochondria for erythropoiesis.","evidence":"Positional cloning, 55Fe incorporation in Mfrn1-null murine erythroblasts, cross-species complementation in zebrafish and yeast","pmids":["16511496"],"confidence":"High","gaps":["Transport mechanism and substrate specificity not biochemically defined","Interacting partners unknown","Role in non-erythroid cells not established"]},{"year":2009,"claim":"Discovery that Abcb10 physically binds and stabilizes Mfrn1 revealed a post-translational regulatory mechanism controlling the abundance of the iron importer in erythroid mitochondria.","evidence":"Affinity purification/MS, reciprocal co-IP, protein half-life measurement, domain mapping in MEL and COS7 cells","pmids":["19805291"],"confidence":"High","gaps":["Whether Abcb10 ATPase activity is required for stabilization unknown","Role of ferrochelatase in the complex not yet tested"]},{"year":2010,"claim":"Identification of ferrochelatase as a third subunit of the Mfrn1–Abcb10 complex demonstrated that iron import is physically coupled to the terminal step of heme synthesis, explaining how mitochondria coordinate iron delivery with porphyrin metallation.","evidence":"FLAG affinity purification/MS and reciprocal co-IP with endogenous proteins in MEL and HEK293 cells","pmids":["20427704"],"confidence":"High","gaps":["Stoichiometry and structural architecture of the ternary complex undefined","Whether iron–sulfur cluster biogenesis uses the same complex unknown"]},{"year":2011,"claim":"Conditional knockout studies in mice established that Mfrn1 is essential for organismal viability, adult erythropoiesis, and hepatic heme synthesis, and that its loss in hepatocytes under porphyrin stress causes protoporphyria and cirrhosis.","evidence":"Total and tissue-specific Cre-mediated Mfrn1 knockout mice with biochemical and histological phenotyping","pmids":["21310927"],"confidence":"High","gaps":["Relative contribution of Mfrn1 vs. Mfrn2 in non-erythroid tissues not resolved","Human disease association not established"]},{"year":2011,"claim":"ChIP and in vivo reporter assays showed that GATA-1 directly activates Mfrn1 transcription through at least two essential GATA-binding elements within cis-regulatory modules, and that a GATA-2 to GATA-1 switch governs Mfrn1 induction during erythroid maturation.","evidence":"Genome-wide ChIP, zebrafish transgenesis with CRM reporters, morpholino knockdown, GATA-element mutagenesis","pmids":["21248200"],"confidence":"High","gaps":["Epigenetic regulation beyond GATA occupancy not addressed","Super-enhancer architecture not yet mapped"]},{"year":2014,"claim":"Genetic epistasis between Mfrn1 and IRP1 revealed a safety mechanism: when Mfrn1 is reduced, IRP1 represses ALAS2 translation via its 5′-IRE to prevent toxic protoporphyrin accumulation, placing Mfrn1 in a coordinated iron–heme homeostatic circuit.","evidence":"Mfrn1/Irp1 double-mutant mice, protoporphyrin measurements, IRE mutagenesis, ectopic ALAS2 expression","pmids":["24509859"],"confidence":"High","gaps":["Whether IRP2 provides parallel regulation not tested","Mechanism applies to erythroid cells; generalizability unknown"]},{"year":2016,"claim":"CRISPR/Cas9 editing of the SLC25A37 super-enhancer revealed a functional hierarchy among constituent enhancers, including elements with opposing transcriptional activities, refining the model of how erythroid transcription of the iron importer is fine-tuned.","evidence":"CRISPR/Cas9 in situ enhancer deletion, chromatin profiling, GATA occupancy ChIP","pmids":["26766440"],"confidence":"Medium","gaps":["Mechanism of opposing enhancer activities not defined","Whether super-enhancer architecture is conserved across species not shown"]},{"year":2018,"claim":"Biochemical reconstitution demonstrated that Mfrn1 transports free Fe(II) with micromolar affinity and can also transport other divalent transition metals (Mn, Co, Cu, Zn), while mutagenesis identified critical metal-coordinating residues — resolving the substrate specificity and transport mechanism.","evidence":"Recombinant protein reconstituted into liposomes, ITC binding, iron transport assays, extensive site-directed mutagenesis","pmids":["29305420"],"confidence":"High","gaps":["No high-resolution structure available","Transport stoichiometry and counter-ion not defined","Whether physiological selectivity differs from in vitro selectivity unknown"]},{"year":2018,"claim":"Demonstration that PINK1–PARK2-mediated mitophagy degrades SLC25A37 established a post-translational turnover mechanism and linked mitochondrial iron homeostasis to Parkinson's disease genes and pancreatic tumorigenesis via HIF1A and AIM2 inflammasome activation.","evidence":"Pink1/Park2 knockout mice with Kras mutation, western blot, genetic rescue, iron chelation, Hif1a/Aim2 depletion","pmids":["30100261"],"confidence":"High","gaps":["Whether PINK1–PARK2 directly ubiquitylates SLC25A37 or acts indirectly through mitophagy not resolved","Relevance to neuronal iron metabolism not tested"]},{"year":2015,"claim":"Double depletion of Mfrn1 and Mfrn2 in preadipocytes showed that mitoferrin-mediated iron import is required for iron–sulfur protein biogenesis, mitochondrial respiration, and adipogenic differentiation, extending the functional scope beyond erythropoiesis.","evidence":"RNAi double knockdown in 3T3-L1 cells, mitochondrial iron measurement, Seahorse respirometry, adipogenesis and insulin signaling assays","pmids":["26118715"],"confidence":"Medium","gaps":["Mfrn1-specific vs. Mfrn2-specific contributions not separated","Rescue experiment not performed"]},{"year":2020,"claim":"Hepatocyte-specific double knockout of Mfrn1 and Mfrn2 proved that mitoferrin-dependent iron import is essential for liver regeneration and general cell proliferation, with overexpression of either paralog rescuing the defect.","evidence":"Conditional double KO mice, mitochondrial iron quantification, OXPHOS protein measurement, proliferation assay with overexpression rescue","pmids":["32518166"],"confidence":"High","gaps":["Whether Mfrn1 alone is sufficient for proliferation in all tissues not resolved","Downstream iron-requiring processes that limit proliferation not identified"]},{"year":2022,"claim":"Combinatorial CRISPR screening uncovered a synthetic lethal interaction between SLC25A37 and the glutathione transporter SLC25A39, showing that mitochondrial iron and glutathione import jointly sustain OXPHOS — a genetic buffering relationship linking redox and iron homeostasis.","evidence":"Dual CRISPR knockout screen across metabolic states, mitochondrial metabolite profiling, organelle transport assays","pmids":["35513392"],"confidence":"High","gaps":["Mechanism by which glutathione compensates for iron deficiency not defined","Whether interaction is context-dependent (e.g., erythroid vs. non-erythroid) unknown"]},{"year":2023,"claim":"Studies in hepatocytes and neurons revealed that Mfrn1 abundance directly tunes ferroptosis susceptibility and mitochondrial bioenergetics: overexpression promotes ferroptosis via mitochondrial iron overload, while CREB-driven induction in neurons boosts bioenergetics after synaptic activity.","evidence":"Mfrn1 KD/OE in HepG2, ferroptosis assays, mitochondrial Fe2+ measurement; neuronal activity induction, Mfrn1 KD, iron chelation, CREB ChIP","pmids":["37741044","36674431"],"confidence":"Medium","gaps":["Whether CREB-mediated induction occurs in non-neuronal contexts untested","Sex-dimorphic regulation mechanism not fully elucidated"]},{"year":2024,"claim":"DACH1 was shown to promote p53 phosphorylation at Ser392 and p53 translocation to mitochondria where p53 binds SLC25A37 to enhance iron uptake, establishing a direct protein–protein interaction between p53 and the transporter that drives ferroptosis in hepatic stellate cells.","evidence":"Co-IP, GST pulldown, p53 Ser392 mutagenesis, subcellular fractionation, mitochondrial iron measurement, mouse hepatic fibrosis model","pmids":["38437058"],"confidence":"High","gaps":["Structural basis for p53–SLC25A37 interaction unknown","Whether p53 directly modulates transport activity or merely stabilizes the protein not distinguished"]},{"year":2024,"claim":"Comparison of Mfrn1 and SFXN3 knockouts in non-erythroid fibroblasts confirmed Mfrn1 as the dominant mitochondrial iron importer even outside the erythroid lineage.","evidence":"MFRN1 vs. SFXN3 KO in mouse embryonic fibroblasts, mitochondrial catalytic Fe(II) and heme synthesis measurement","pmids":["38599240"],"confidence":"Medium","gaps":["Whether SFXN3 contributes under specific metabolic conditions not excluded","Role in primary human non-erythroid cells not verified"]},{"year":2025,"claim":"Mfrn1 deficiency causes erythroid-specific G2/M cell cycle arrest in zebrafish, rescuable by iron supplementation, revealing that mitochondrial iron import is required for a cell cycle checkpoint during terminal erythroid differentiation.","evidence":"Zebrafish mfrn1 mutants, iron rescue, scRNA-seq, FACS with erythroid reporters, cell cycle analysis","pmids":["40601908"],"confidence":"High","gaps":["Identity of the iron-dependent G2/M target not determined","Whether this checkpoint operates in mammalian erythropoiesis not tested"]},{"year":null,"claim":"A high-resolution structure of Mfrn1 — alone and in complex with Abcb10 and ferrochelatase — is needed to explain transport mechanism, substrate selectivity, and how p53 binding enhances iron uptake; the molecular identity of the iron-dependent G2/M checkpoint target in erythroid cells remains unknown.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural model of Mfrn1 or the ternary complex exists","Iron-dependent cell cycle checkpoint target unidentified","Whether PINK1–PARK2 directly ubiquitylates SLC25A37 or acts via bulk mitophagy is unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,7]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,7,1,2]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,7,18,11]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[8,14,15]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[8]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[10,17]}],"complexes":["Mfrn1–Abcb10–ferrochelatase complex"],"partners":["ABCB10","FECH","TP53","SLC25A39","IRP1"],"other_free_text":[]},"mechanistic_narrative":"SLC25A37 (mitoferrin-1/Mfrn1) is a mitochondrial inner membrane iron transporter that imports free Fe(II) into the mitochondrial matrix to support heme biosynthesis, iron–sulfur cluster assembly, and oxidative phosphorylation. It transports Fe(II) with micromolar affinity and forms an oligomeric complex with Abcb10 and ferrochelatase that couples iron import directly to heme synthesis; Abcb10 stabilizes Mfrn1 protein via its N-terminal domain [PMID:29305420, PMID:19805291, PMID:20427704]. Transcription is driven by GATA-1 through a hierarchically organized super-enhancer in erythroid cells, and protein turnover is regulated by PINK1–PARK2-mediated mitophagy [PMID:21248200, PMID:26766440, PMID:30100261]. Loss of Mfrn1 causes embryonic lethality and severe anemia in mice, erythroid G2/M cell cycle arrest in zebrafish, and protoporphyria with liver cirrhosis in hepatocyte-specific knockouts, while excessive Mfrn1 activity promotes mitochondrial iron overload and ferroptosis in multiple tissues [PMID:21310927, PMID:40601908, PMID:37741044]."},"prefetch_data":{"uniprot":{"accession":"Q9NYZ2","full_name":"Mitoferrin-1","aliases":["Mitochondrial iron transporter 1","Mitochondrial solute carrier protein","Solute carrier family 25 member 37"],"length_aa":338,"mass_kda":37.3,"function":"Mitochondrial iron transporter that specifically mediates iron uptake in developing erythroid cells, thereby playing an essential role in heme biosynthesis","subcellular_location":"Mitochondrion inner 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Variation","date":"2024-08-06","source":"bioRxiv","url":"https://doi.org/10.1101/2024.08.02.24310874","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49168,"output_tokens":6145,"usd":0.11984},"stage2":{"model":"claude-opus-4-6","input_tokens":9699,"output_tokens":3994,"usd":0.222518},"total_usd":0.342358,"stage1_batch_id":"msgbatch_011rkcQdVV1RaFq9XhcG6df6","stage2_batch_id":"msgbatch_01RzgrJafdF4EWHhj5mNi6dh","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2006,\n      \"finding\": \"SLC25A37 (mitoferrin/Mfrn1) functions as the principal mitochondrial iron importer essential for heme biosynthesis in vertebrate erythroblasts; loss-of-function in zebrafish (frascati mutant) causes hypochromic anemia and erythroid maturation arrest with severely impaired 55Fe incorporation into heme, and murine Mfrn1 rescues the zebrafish defect while zebrafish mfrn1 complements yeast mrs3/mrs4 mutants.\",\n      \"method\": \"Positional cloning, 55Fe incorporation assay in Mfrn1-null murine erythroblasts derived from embryonic stem cells, cross-species complementation (zebrafish rescue and yeast complementation)\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including genetic rescue, functional iron transport assay, and cross-species complementation; foundational paper replicated by subsequent work\",\n      \"pmids\": [\"16511496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Mfrn1 (SLC25A37) physically interacts with Abcb10 (a mitochondrial inner membrane ABC transporter) at its N-terminal domain; Abcb10 stabilizes Mfrn1 protein and enhances Mfrn1-dependent mitochondrial iron importation in erythroid cells.\",\n      \"method\": \"In vivo epitope-tagging affinity purification and mass spectrometry, co-immunoprecipitation, protein half-life measurement, cotransfection in COS7 and MEL cells, domain mapping\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with endogenous proteins, MS identification, functional rescue, domain mapping; replicated in heterologous cell system\",\n      \"pmids\": [\"19805291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Ferrochelatase (Fech), the terminal heme synthesis enzyme, physically interacts with Mfrn1 and Abcb10 to form an oligomeric complex in erythroid mitochondria, coupling mitochondrial iron importation to heme biosynthesis.\",\n      \"method\": \"Affinity purification and mass spectrometry from stable FLAG-tagged MEL cell clones, co-immunoprecipitation/Western blot with endogenous proteins in MEL cells and heterologous HEK293 cells\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP confirmed with endogenous proteins and in heterologous system, MS identification; builds directly on prior mechanistic work\",\n      \"pmids\": [\"20427704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Total deletion of Mfrn1 in mouse embryos causes embryonic lethality; selective deletion in adult hematopoietic tissues causes severe anemia due to erythroblast formation deficit; deletion in hepatocytes under conditions of increased porphyrin synthesis leads to protoporphyria, cholestasis, and bridging cirrhosis due to inability to convert protoporphyrin IX to heme.\",\n      \"method\": \"Conditional and total Mfrn1 knockout mouse models, hematopoietic tissue-specific and hepatocyte-specific Cre-mediated deletion, biochemical and histological phenotyping\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean tissue-specific KO with defined cellular and biochemical phenotypes in multiple tissues\",\n      \"pmids\": [\"21310927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"GATA-1 directly regulates Mfrn1 (SLC25A37) transcription during erythroid maturation through cis-regulatory modules (CRMs) containing GATA-binding elements; mutagenesis of individual GATA-1 binding elements showed at least two of three are required for GATA-mediated Mfrn1 transcription. ChIP assays demonstrate switching from GATA-2 to GATA-1 at these elements during erythroid maturation.\",\n      \"method\": \"Genome-wide ChIP for GATA-1, zebrafish transgenesis with CRM-reporter constructs, morpholino knockdown, GATA-binding element mutagenesis, ChIP assays in differentiating cells\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct ChIP, in vivo reporter assays, and mutagenesis providing mechanistic detail on transcriptional regulation\",\n      \"pmids\": [\"21248200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Iron regulatory protein-1 (IRP1) protects against protoporphyrin accumulation in Mfrn1-deficient erythroid cells by binding the 5'-IRE of alas2 mRNA to inhibit its translation; Mfrn1/Irp1 double-mutant erythroid cells show significantly increased protoporphyrin levels, and ectopic alas2 with a mutant IRE phenocopies IRP1 deficiency.\",\n      \"method\": \"Gene trap mouse model (Mfrn1+/gt;Irp1-/-), protoporphyrin measurements, IRE mutagenesis, ectopic alas2 expression, epistasis analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with multiple mutant combinations and molecular rescue; clean mechanistic pathway placement\",\n      \"pmids\": [\"24509859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SF3B1 mutations in myelodysplastic syndrome with ring sideroblasts lead to higher expression of a specific retained-intron isoform of SLC25A37, contributing to mitochondrial iron overload without changing iron valence (Fe2+ retained in both mutant and wild-type).\",\n      \"method\": \"RNA sequencing, RT-PCR, transmission electron microscopy/spectroscopy, flow cytometry for iron measurement in patient samples\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — patient sample RNA-seq and iron measurement, but no functional rescue; single lab\",\n      \"pmids\": [\"24854990\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Mfrn1 (SLC25A37) transports Fe(II) with micromolar affinity and can also transport Mn(II), Co(II), Cu, and Zn but discriminates against Ni and alkali divalent ions; it transports free iron rather than chelated iron complexes. Multiple residues with side chains capable of coordinating first-row transition metals are critical for metal binding and/or transport activity.\",\n      \"method\": \"Recombinant protein purification under non-denaturing conditions, isothermal titration calorimetry, in vitro reconstitution into defined liposomes, iron transport assay, extensive site-directed mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution of transport activity combined with ITC binding measurements and extensive mutagenesis; multiple orthogonal methods in single study\",\n      \"pmids\": [\"29305420\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PINK1-PARK2 pathway-mediated autophagic degradation of SLC25A37 (and SLC25A28) suppresses mitochondrial iron accumulation; depletion of Pink1 and Park2 leads to increased SLC25A37 levels, mitochondrial iron accumulation, HIF1A-dependent Warburg effect, and AIM2-dependent inflammasome activation promoting pancreatic tumorigenesis.\",\n      \"method\": \"Spontaneous pancreatic cancer mouse models (Pink1/Park2 knockout with mutant Kras), western blot, genetic rescue, pharmacological iron chelation, genetic depletion of Hif1a and Aim2\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic KO models with orthogonal pharmacological and genetic interventions; pathway placement established through epistasis\",\n      \"pmids\": [\"30100261\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SLC25A37 expression in erythroid cells is controlled by a super-enhancer; CRISPR/Cas9-mediated genomic editing of constituent enhancers within this super-enhancer revealed functional hierarchy among elements including some with opposing activities that cooperate to coordinate transcription.\",\n      \"method\": \"CRISPR/Cas9 in situ enhancer editing, chromatin profiling, GATA transcription factor occupancy ChIP\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct enhancer editing by CRISPR/Cas9 but functional characterization of SLC25A37 regulation is part of a broader study\",\n      \"pmids\": [\"26766440\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Both Mfrn1 (SLC25A37) and Mfrn2 are required for liver regeneration and cell proliferation; double knockout of Mfrn1 and Mfrn2 in hepatocytes resulted in 40% reduction in mitochondrial iron and reduced OXPHOS proteins; bone marrow-derived macrophages or skin fibroblasts lacking both mitoferrins cannot proliferate, and overexpression of Mfrn1-GFP or Mfrn2-GFP rescues this defect.\",\n      \"method\": \"Hepatocyte-specific and hematopoietic-specific conditional knockout mice, mitochondrial iron measurement, OXPHOS protein quantification, proliferation assay, overexpression rescue in primary cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific KO with functional rescue by overexpression; multiple cell types and in vivo liver regeneration assay\",\n      \"pmids\": [\"32518166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SLC25A37 (A37) and SLC25A39 have a genetic buffering (synthetic lethal) interaction; A37-mediated mitochondrial iron uptake and A39-mediated mitochondrial glutathione import jointly support mitochondrial OXPHOS, as revealed by combinatorial CRISPR screening.\",\n      \"method\": \"Pooled dual CRISPR knockout screening across four metabolic states, mitochondrial metabolite profiling, organelle transport assays, structure-guided mutagenesis of SLC25A39\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide combinatorial genetic screen with orthogonal metabolite profiling and transport assays; rigorous GxG interaction study\",\n      \"pmids\": [\"35513392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ENO1 suppresses Mfrn1 expression by recruiting CNOT6 to accelerate IRP1 mRNA decay, thereby reducing mitochondrial iron import; knockdown of IRP1 reduces Mfrn1 expression and suppresses mitochondrial iron-induced ferroptosis in HCC cells, placing Mfrn1 downstream of the ENO1-IRP1 axis.\",\n      \"method\": \"RNA-binding protein assay (ENO1 as RBP), mRNA stability assay, IRP1 knockdown, Mfrn1 expression measurement, in vitro and in vivo ferroptosis assays\",\n      \"journal\": \"Nature cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods establishing ENO1-IRP1-Mfrn1 pathway with functional ferroptosis readout; in vitro and in vivo validation\",\n      \"pmids\": [\"35121990\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Synaptic activity transcriptionally induces Mfrn1 expression via CREB, leading to enhanced mitochondrial iron uptake that boosts mitochondrial bioenergetics beyond the duration of synaptic activity; iron chelation or Mfrn1 knockdown blocks this activity-mediated bioenergetics increase in neurons.\",\n      \"method\": \"Neuronal activity induction assay, Mfrn1 knockdown (RNAi), iron chelation, mitochondrial bioenergetics measurement, CREB reporter and ChIP\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — KD with bioenergetics readout and CREB mechanistic link, but single lab study\",\n      \"pmids\": [\"36674431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Mfrn1 (SLC25A37) knockdown decreases ferroptosis and mitochondrial iron accumulation in hepatocytes, while Mfrn1 overexpression exacerbates ferroptosis; lower Mfrn1 expression in female hepatocytes (compared to male) accounts in part for sexual dimorphism in ferroptosis susceptibility.\",\n      \"method\": \"Mfrn1 knockdown in HepG2 cells, ferroptosis induction assays, mitochondrial Fe2+ measurement, sex hormone manipulation (ovariectomy)\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — KD/OE with specific ferroptosis phenotype and mitochondrial iron measurement; mechanism partially established\",\n      \"pmids\": [\"37741044\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DACH1 promotes p53 phosphorylation at serine 392 and mitochondrial translocation of p53, which then binds SLC25A37 to enhance its iron uptake capacity, causing mitochondrial iron overload and ferroptosis; mutation of p53 Ser392 prevents DACH1-p53 interaction and SLC25A37-mediated ferroptosis. Knockdown of SLC25A37 impairs p53-mediated mitochondrial iron overload and ferroptosis in hepatic stellate cells.\",\n      \"method\": \"CRISPR-Cas9 DACH1 knockout, immunoprecipitation, GST pulldown, p53 Ser392 mutagenesis, subcellular fractionation, mitochondrial iron measurement, mouse hepatic fibrosis model with HSC-specific knockdowns\",\n      \"journal\": \"Hepatology communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — Co-IP, pulldown, mutagenesis, subcellular fractionation, and in vivo mouse model with tissue-specific knockdowns; multiple orthogonal methods\",\n      \"pmids\": [\"38437058\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Mfrn1 overexpression in glioma cells increases mitochondrial iron levels, enhances cell proliferation and anchorage-independent growth, decreases mouse survival in orthotopic glioma, and upregulates glutathione, protecting glioma cells from 4-hydroxynonenal-induced protein damage.\",\n      \"method\": \"Mfrn1 overexpression in glioma cell lines, mitochondrial iron measurement, proliferation and anchorage-independent growth assays, orthotopic mouse model, glutathione measurement\",\n      \"journal\": \"Antioxidants (Basel, Switzerland)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — overexpression with multiple phenotypic readouts including in vivo; mechanism linked to glutathione pathway\",\n      \"pmids\": [\"36829908\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Mitochondrial iron transport via Mfrn1 is essential for erythroid cell cycle progression; mfrn1-deficient zebrafish embryos show erythroid cell cycle arrest at G2/M with enlarged nuclei suggesting a mitotic defect; iron supplementation rescues the cell cycle defect, and the proliferative defect is specific to terminally differentiating erythroid cells.\",\n      \"method\": \"Zebrafish mfrn1 mutants, iron supplementation rescue, single-cell RNA sequencing, FACS with erythroid reporter lines (cd41, gata1), cell cycle analysis\",\n      \"journal\": \"Blood advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic mutant with specific cell cycle phenotype, iron rescue, scRNA-seq, and reporter-based cell sorting; multiple orthogonal methods\",\n      \"pmids\": [\"40601908\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Depletion of Mfrn1 and Mfrn2 in 3T3-L1 preadipocytes impairs biosynthesis of iron-sulfur proteins due to reduced mitochondrial iron content, decreases mitochondrial oxygen consumption rate and ATP levels, reduces expression of adipogenic genes, impairs lipid production during adipogenic differentiation, and decreases insulin-induced glucose uptake and Akt phosphorylation.\",\n      \"method\": \"Double knockdown of Mfrn1 and Mfrn2 by RNAi in 3T3-L1 cells, mitochondrial iron measurement, oxygen consumption rate (Seahorse), ATP assay, adipogenesis assay, insulin signaling assay\",\n      \"journal\": \"Free radical research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — double knockdown with multiple functional readouts; single lab but multiple assays establishing metabolic role\",\n      \"pmids\": [\"26118715\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Knockdown of SLC25A37 in osteosarcoma cells decreases ROS production, implicating Mfrn1-mediated mitochondrial iron import in iron-induced ROS generation that promotes the Warburg effect and carcinogenesis.\",\n      \"method\": \"shRNA stable knockdown of SLC25A37, ROS measurement (DCFH-DA), Seahorse respirometry, cell proliferation and carcinogenesis assays\",\n      \"journal\": \"Cancer cell international\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — KD with ROS and metabolic phenotype but limited mechanistic depth; single lab\",\n      \"pmids\": [\"32831652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SLC25A37 (Mfrn1) is required for neutrophil oxidative phosphorylation, NET formation, and type I IFN production downstream of TLR9; CRISPR targeting of SLC25A37 in a neutrophil differentiation platform disrupted this metabolic-immune circuit.\",\n      \"method\": \"Targeted CRISPR-Cas9 screen in CD34+-derived neutrophils, NET formation assay, IFN production measurement, TLR9 stimulation, OXPHOS measurement\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 2-3 — CRISPR screen with functional readouts but preprint, single study, no independent replication\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MFRN1 knockout in mouse embryonic fibroblasts causes more intense mitochondrial Fe(II) deficiency than SFXN3 knockout, confirming Mfrn1 as the dominant mitochondrial iron importer in non-erythroid cells; Mfrn1 KO also results in insufficient mitochondrial heme synthesis under iron overload.\",\n      \"method\": \"MFRN1 knockout in mouse embryonic fibroblasts, mitochondrial catalytic Fe(II) measurement, heme synthesis assay, comparison with SFXN3 KO\",\n      \"journal\": \"Free radical research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined iron measurement phenotype; comparison with parallel KO establishes relative contribution\",\n      \"pmids\": [\"38599240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Mfrn1 knockdown in MCAO/R rat model suppresses ferroptosis, reduces mitochondrial iron accumulation and mitochondrial damage, and reduces AIS-related injury; overexpression of Mfrn1 exacerbates all these effects, establishing Mfrn1 as a promoter of mitochondrial iron overload and ferroptotic damage in acute ischemic stroke.\",\n      \"method\": \"RNAi knockdown and AAV9-mediated overexpression in vitro (OGD/R) and in vivo (MCAO/R rat), mitochondrial iron measurement, ferroptosis markers, RNA sequencing\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional manipulation (KD and OE) with specific phenotypic readouts in vitro and in vivo; single lab\",\n      \"pmids\": [\"40199135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The murine SLC25A37 (Mscp) gene encodes a protein with six transmembrane domains and three mitochondrial energy-transfer protein signature motifs characteristic of the mitochondrial carrier family, sharing 50% identity with C. elegans T26089 and ~40% with yeast MRS3/MRS4; its mRNA is highly expressed in spleen and rapidly decreases at 4-5 weeks of age during splenic lymphocyte maturation.\",\n      \"method\": \"cDNA cloning, Northern blot analysis, sequence homology analysis, cDNA microarray\",\n      \"journal\": \"Mammalian genome : official journal of the International Mammalian Genome Society\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3-4 — cloning and expression characterization without functional assay; establishes domain architecture\",\n      \"pmids\": [\"11845285\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SLC25A37 (mitoferrin-1/Mfrn1) is a mitochondrial inner membrane carrier that imports Fe(II) directly (free iron, not chelated) into the mitochondrial matrix to fuel heme biosynthesis and iron-sulfur cluster assembly; it forms an oligomeric complex with Abcb10 (which stabilizes Mfrn1 protein via its N-terminal domain) and ferrochelatase to couple iron import to heme synthesis, is transcriptionally driven in erythroid cells by GATA-1 through defined super-enhancer elements, is post-translationally degraded via the PINK1-PARK2 mitophagy pathway, can be functionally enhanced by p53 binding (promoted by DACH1-mediated Ser392 phosphorylation), and is essential for erythroid cell cycle progression at G2/M, liver regeneration, adipogenic differentiation, and mitochondrial OXPHOS in proliferating cells, while its activity is buffered by the SLC25A39 glutathione transporter for OXPHOS support.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SLC25A37 (mitoferrin-1/Mfrn1) is a mitochondrial inner membrane iron transporter that imports free Fe(II) into the mitochondrial matrix to support heme biosynthesis, iron–sulfur cluster assembly, and oxidative phosphorylation. It transports Fe(II) with micromolar affinity and forms an oligomeric complex with Abcb10 and ferrochelatase that couples iron import directly to heme synthesis; Abcb10 stabilizes Mfrn1 protein via its N-terminal domain [PMID:29305420, PMID:19805291, PMID:20427704]. Transcription is driven by GATA-1 through a hierarchically organized super-enhancer in erythroid cells, and protein turnover is regulated by PINK1–PARK2-mediated mitophagy [PMID:21248200, PMID:26766440, PMID:30100261]. Loss of Mfrn1 causes embryonic lethality and severe anemia in mice, erythroid G2/M cell cycle arrest in zebrafish, and protoporphyria with liver cirrhosis in hepatocyte-specific knockouts, while excessive Mfrn1 activity promotes mitochondrial iron overload and ferroptosis in multiple tissues [PMID:21310927, PMID:40601908, PMID:37741044].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Initial cloning established SLC25A37 as a member of the mitochondrial carrier family with six transmembrane domains and three energy-transfer signature motifs, but its transported substrate was unknown.\",\n      \"evidence\": \"cDNA cloning, Northern blot, and sequence homology to yeast MRS3/MRS4 in mouse tissues\",\n      \"pmids\": [\"11845285\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No transport substrate identified\", \"No functional assay performed\", \"Expression data limited to Northern blot\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Positional cloning of the zebrafish frascati mutant identified SLC25A37 as the principal mitochondrial iron importer required for heme biosynthesis, resolving the long-standing question of how iron enters mitochondria for erythropoiesis.\",\n      \"evidence\": \"Positional cloning, 55Fe incorporation in Mfrn1-null murine erythroblasts, cross-species complementation in zebrafish and yeast\",\n      \"pmids\": [\"16511496\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transport mechanism and substrate specificity not biochemically defined\", \"Interacting partners unknown\", \"Role in non-erythroid cells not established\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Discovery that Abcb10 physically binds and stabilizes Mfrn1 revealed a post-translational regulatory mechanism controlling the abundance of the iron importer in erythroid mitochondria.\",\n      \"evidence\": \"Affinity purification/MS, reciprocal co-IP, protein half-life measurement, domain mapping in MEL and COS7 cells\",\n      \"pmids\": [\"19805291\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Abcb10 ATPase activity is required for stabilization unknown\", \"Role of ferrochelatase in the complex not yet tested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identification of ferrochelatase as a third subunit of the Mfrn1–Abcb10 complex demonstrated that iron import is physically coupled to the terminal step of heme synthesis, explaining how mitochondria coordinate iron delivery with porphyrin metallation.\",\n      \"evidence\": \"FLAG affinity purification/MS and reciprocal co-IP with endogenous proteins in MEL and HEK293 cells\",\n      \"pmids\": [\"20427704\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structural architecture of the ternary complex undefined\", \"Whether iron–sulfur cluster biogenesis uses the same complex unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Conditional knockout studies in mice established that Mfrn1 is essential for organismal viability, adult erythropoiesis, and hepatic heme synthesis, and that its loss in hepatocytes under porphyrin stress causes protoporphyria and cirrhosis.\",\n      \"evidence\": \"Total and tissue-specific Cre-mediated Mfrn1 knockout mice with biochemical and histological phenotyping\",\n      \"pmids\": [\"21310927\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of Mfrn1 vs. Mfrn2 in non-erythroid tissues not resolved\", \"Human disease association not established\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"ChIP and in vivo reporter assays showed that GATA-1 directly activates Mfrn1 transcription through at least two essential GATA-binding elements within cis-regulatory modules, and that a GATA-2 to GATA-1 switch governs Mfrn1 induction during erythroid maturation.\",\n      \"evidence\": \"Genome-wide ChIP, zebrafish transgenesis with CRM reporters, morpholino knockdown, GATA-element mutagenesis\",\n      \"pmids\": [\"21248200\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Epigenetic regulation beyond GATA occupancy not addressed\", \"Super-enhancer architecture not yet mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Genetic epistasis between Mfrn1 and IRP1 revealed a safety mechanism: when Mfrn1 is reduced, IRP1 represses ALAS2 translation via its 5′-IRE to prevent toxic protoporphyrin accumulation, placing Mfrn1 in a coordinated iron–heme homeostatic circuit.\",\n      \"evidence\": \"Mfrn1/Irp1 double-mutant mice, protoporphyrin measurements, IRE mutagenesis, ectopic ALAS2 expression\",\n      \"pmids\": [\"24509859\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether IRP2 provides parallel regulation not tested\", \"Mechanism applies to erythroid cells; generalizability unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"CRISPR/Cas9 editing of the SLC25A37 super-enhancer revealed a functional hierarchy among constituent enhancers, including elements with opposing transcriptional activities, refining the model of how erythroid transcription of the iron importer is fine-tuned.\",\n      \"evidence\": \"CRISPR/Cas9 in situ enhancer deletion, chromatin profiling, GATA occupancy ChIP\",\n      \"pmids\": [\"26766440\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of opposing enhancer activities not defined\", \"Whether super-enhancer architecture is conserved across species not shown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Biochemical reconstitution demonstrated that Mfrn1 transports free Fe(II) with micromolar affinity and can also transport other divalent transition metals (Mn, Co, Cu, Zn), while mutagenesis identified critical metal-coordinating residues — resolving the substrate specificity and transport mechanism.\",\n      \"evidence\": \"Recombinant protein reconstituted into liposomes, ITC binding, iron transport assays, extensive site-directed mutagenesis\",\n      \"pmids\": [\"29305420\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution structure available\", \"Transport stoichiometry and counter-ion not defined\", \"Whether physiological selectivity differs from in vitro selectivity unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstration that PINK1–PARK2-mediated mitophagy degrades SLC25A37 established a post-translational turnover mechanism and linked mitochondrial iron homeostasis to Parkinson's disease genes and pancreatic tumorigenesis via HIF1A and AIM2 inflammasome activation.\",\n      \"evidence\": \"Pink1/Park2 knockout mice with Kras mutation, western blot, genetic rescue, iron chelation, Hif1a/Aim2 depletion\",\n      \"pmids\": [\"30100261\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PINK1–PARK2 directly ubiquitylates SLC25A37 or acts indirectly through mitophagy not resolved\", \"Relevance to neuronal iron metabolism not tested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Double depletion of Mfrn1 and Mfrn2 in preadipocytes showed that mitoferrin-mediated iron import is required for iron–sulfur protein biogenesis, mitochondrial respiration, and adipogenic differentiation, extending the functional scope beyond erythropoiesis.\",\n      \"evidence\": \"RNAi double knockdown in 3T3-L1 cells, mitochondrial iron measurement, Seahorse respirometry, adipogenesis and insulin signaling assays\",\n      \"pmids\": [\"26118715\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mfrn1-specific vs. Mfrn2-specific contributions not separated\", \"Rescue experiment not performed\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Hepatocyte-specific double knockout of Mfrn1 and Mfrn2 proved that mitoferrin-dependent iron import is essential for liver regeneration and general cell proliferation, with overexpression of either paralog rescuing the defect.\",\n      \"evidence\": \"Conditional double KO mice, mitochondrial iron quantification, OXPHOS protein measurement, proliferation assay with overexpression rescue\",\n      \"pmids\": [\"32518166\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Mfrn1 alone is sufficient for proliferation in all tissues not resolved\", \"Downstream iron-requiring processes that limit proliferation not identified\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Combinatorial CRISPR screening uncovered a synthetic lethal interaction between SLC25A37 and the glutathione transporter SLC25A39, showing that mitochondrial iron and glutathione import jointly sustain OXPHOS — a genetic buffering relationship linking redox and iron homeostasis.\",\n      \"evidence\": \"Dual CRISPR knockout screen across metabolic states, mitochondrial metabolite profiling, organelle transport assays\",\n      \"pmids\": [\"35513392\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which glutathione compensates for iron deficiency not defined\", \"Whether interaction is context-dependent (e.g., erythroid vs. non-erythroid) unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Studies in hepatocytes and neurons revealed that Mfrn1 abundance directly tunes ferroptosis susceptibility and mitochondrial bioenergetics: overexpression promotes ferroptosis via mitochondrial iron overload, while CREB-driven induction in neurons boosts bioenergetics after synaptic activity.\",\n      \"evidence\": \"Mfrn1 KD/OE in HepG2, ferroptosis assays, mitochondrial Fe2+ measurement; neuronal activity induction, Mfrn1 KD, iron chelation, CREB ChIP\",\n      \"pmids\": [\"37741044\", \"36674431\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CREB-mediated induction occurs in non-neuronal contexts untested\", \"Sex-dimorphic regulation mechanism not fully elucidated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"DACH1 was shown to promote p53 phosphorylation at Ser392 and p53 translocation to mitochondria where p53 binds SLC25A37 to enhance iron uptake, establishing a direct protein–protein interaction between p53 and the transporter that drives ferroptosis in hepatic stellate cells.\",\n      \"evidence\": \"Co-IP, GST pulldown, p53 Ser392 mutagenesis, subcellular fractionation, mitochondrial iron measurement, mouse hepatic fibrosis model\",\n      \"pmids\": [\"38437058\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for p53–SLC25A37 interaction unknown\", \"Whether p53 directly modulates transport activity or merely stabilizes the protein not distinguished\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Comparison of Mfrn1 and SFXN3 knockouts in non-erythroid fibroblasts confirmed Mfrn1 as the dominant mitochondrial iron importer even outside the erythroid lineage.\",\n      \"evidence\": \"MFRN1 vs. SFXN3 KO in mouse embryonic fibroblasts, mitochondrial catalytic Fe(II) and heme synthesis measurement\",\n      \"pmids\": [\"38599240\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether SFXN3 contributes under specific metabolic conditions not excluded\", \"Role in primary human non-erythroid cells not verified\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Mfrn1 deficiency causes erythroid-specific G2/M cell cycle arrest in zebrafish, rescuable by iron supplementation, revealing that mitochondrial iron import is required for a cell cycle checkpoint during terminal erythroid differentiation.\",\n      \"evidence\": \"Zebrafish mfrn1 mutants, iron rescue, scRNA-seq, FACS with erythroid reporters, cell cycle analysis\",\n      \"pmids\": [\"40601908\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the iron-dependent G2/M target not determined\", \"Whether this checkpoint operates in mammalian erythropoiesis not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A high-resolution structure of Mfrn1 — alone and in complex with Abcb10 and ferrochelatase — is needed to explain transport mechanism, substrate selectivity, and how p53 binding enhances iron uptake; the molecular identity of the iron-dependent G2/M checkpoint target in erythroid cells remains unknown.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model of Mfrn1 or the ternary complex exists\", \"Iron-dependent cell cycle checkpoint target unidentified\", \"Whether PINK1–PARK2 directly ubiquitylates SLC25A37 or acts via bulk mitophagy is unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 7, 1, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 7, 18, 11]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [8, 14, 15]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [10, 17]}\n    ],\n    \"complexes\": [\n      \"Mfrn1–Abcb10–ferrochelatase complex\"\n    ],\n    \"partners\": [\n      \"ABCB10\",\n      \"FECH\",\n      \"TP53\",\n      \"SLC25A39\",\n      \"IRP1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}