GO:0006826 iron ion transport: Cellular Iron Homeostasis Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0006826 iron ion transport describes the directed movement of iron ions into, out of, or within cells, mediated by transporters or pores.
• Iron transport is essential for oxygen delivery, energy metabolism, DNA synthesis, and neurotransmitter synthesis, and its dysregulation contributes to ferroptosis, neurodegeneration, and cancer.
• Key transporters include DMT1 (SLC11A2), ferroportin (SLC40A1), transferrin receptor 1 (TFRC), and ZIP8/ZIP14 (SLC39A8/SLC39A14).
• Plants utilize IRT1, NRAMP, and YSL transporters for iron uptake and distribution, highlighting evolutionary conservation.
• Siderophore-dependent ferrichelatases enable iron acquisition in microbes, illustrating diverse transport strategies.
• CRISPR knockout, point mutation, knock-in, and overexpression models are powerful tools to dissect iron transport gene function and related diseases.
Description
Iron ion transport (GO:0006826) is the biological process by which iron ions (Fe2+ or Fe3+) are moved across cellular membranes or between cells via specific transporters or pores. This process is fundamental for maintaining iron homeostasis, as iron is both essential for life and potentially toxic due to its ability to generate reactive oxygen species. In humans, iron transport is critical for erythropoiesis, immune function, and neuronal health, and its dysregulation is linked to a wide range of diseases including anemia, hemochromatosis, neurodegeneration, and cancer. In plants, iron transport is vital for photosynthesis and crop yield, and plants have evolved sophisticated uptake and distribution systems. Microbial iron transport, often mediated by siderophores and ferrichelatases, is crucial for pathogenesis and survival in iron-limited environments. Understanding the molecular mechanisms of iron ion transport is therefore a central goal in cell biology, physiology, and medicine.
iron ion transport At A Glance
| GO ID | GO:0006826 |
|---|---|
| GO term | iron ion transport |
| Ontology | biological_process |
| Synonym | ferric ion import, ferric ion transport, ferric iron import, ferric iron transport, ferric iron uptake, ferrous ion transport, ferrous iron transport, iron ion import, iron transport |
| Major function | Directed movement of iron ions across membranes or between cells |
| Key transporters | DMT1 (SLC11A2), ferroportin (SLC40A1), TFRC, ZIP8 (SLC39A8), ZIP14 (SLC39A14), IRT1, NRAMP, YSL |
| Cellular locations | Plasma membrane, endosomes, mitochondria, lysosomes |
| Associated diseases | Iron overload, anemia, neurodegeneration, cancer |
| Research methods | CRISPR screens, radiolabeled iron uptake, fluorescent iron sensors, proteomics |
What Is GO:0006826?
According to the Gene Ontology, GO:0006826 iron ion transport is defined as the directed movement of iron (Fe) ions into, out of, or within a cell, or between cells, by means of some agent such as a transporter or pore. This encompasses the import, export, and intracellular trafficking of both ferrous (Fe2+) and ferric (Fe3+) ions, and includes the activity of iron transporters, channels, and chaperones that facilitate these movements.
Why Is iron ion transport Important in Cell Biology?
Iron ion transport is essential for life because iron is a cofactor for numerous enzymes involved in oxygen transport, electron transfer, DNA synthesis, and neurotransmitter production. Disruption of iron transport leads to iron deficiency or overload, both of which have severe physiological consequences. For example, mutations in DMT1 cause microcytic anemia, while ferroportin mutations lead to hemochromatosis. In the brain, altered iron transport is associated with Alzheimer's disease and other neurodegenerative disorders. Moreover, iron transport is a key vulnerability in cancer cells and a target for ferroptosis induction. Therefore, studying iron ion transport provides critical insights into human health and disease.
• Iron transport maintains systemic iron homeostasis and prevents iron deficiency or overload.
• DMT1 mutations cause microcytic anemia and iron overload in humans.
• Ferroportin (SLC40A1) mutations lead to hereditary hemochromatosis type 4.
• Iron accumulation in the brain is a hallmark of Alzheimer's disease and correlates with transcriptional changes.
• Ferroptosis, an iron-dependent form of cell death, is regulated by iron transport and is a target for cancer therapy.
• In plants, iron transport genes like IRT1 are essential for iron uptake and crop productivity.
• Microbial siderophore-dependent iron transport is a virulence factor and antibiotic target.
• Iron transport proteins are potential biomarkers and therapeutic targets in cancer and neurodegeneration.
What Happens During iron ion transport?
Iron uptake at the plasma membrane
In simple terms: Cells take in iron from the outside environment using specialized transporter proteins.
In mammals, dietary iron is absorbed by enterocytes via DMT1 (SLC11A2), which transports ferrous iron (Fe2+) across the apical membrane. In plants, IRT1 (Iron-Regulated Transporter 1) mediates ferrous iron uptake from the soil. Microbial cells often secrete siderophores to chelate ferric iron, which is then transported back into the cell via specific transporters and ferrichelatases. This step is tightly regulated to prevent iron toxicity.
Intracellular iron trafficking and storage
In simple terms: Once inside, iron is moved to where it is needed or stored safely.
After uptake, iron can be stored in ferritin or transported to mitochondria for heme and iron-sulfur cluster synthesis. DMT1 also mediates iron exit from endosomes into the cytoplasm. In plants, NRAMP transporters move iron out of vacuoles and into the cytosol. Intracellular iron trafficking involves chaperones and is essential for cellular iron homeostasis.
Iron export and systemic distribution
In simple terms: Cells release iron into the bloodstream or other tissues via export proteins.
Ferroportin (SLC40A1) is the only known mammalian iron export protein, transporting iron from enterocytes, macrophages, and hepatocytes into the plasma. In plants, YSL (Yellow Stripe-Like) transporters move iron-chelator complexes through the vasculature. In bacteria, iron efflux systems help maintain intracellular iron balance. Dysregulation of iron export leads to iron overload disorders.
Regulation of iron transport by IRP/IRE system
In simple terms: Cells sense iron levels and adjust transporter production accordingly.
The iron regulatory protein (IRP)/iron-responsive element (IRE) system post-transcriptionally regulates the expression of key iron transport genes such as DMT1, TFRC, and ferroportin. When iron is scarce, IRPs bind to IREs in mRNAs to stabilize TFRC and DMT1 transcripts and inhibit ferroportin translation, increasing iron uptake and retention. Conversely, high iron levels reduce IRP activity, promoting iron storage and export.
Non-transferrin-bound iron (NTBI) transport
In simple terms: When transferrin is saturated, other transporters take up excess iron.
Under iron overload conditions, non-transferrin-bound iron (NTBI) appears in plasma and is taken up by cells via transporters such as ZIP14 (SLC39A14), ZIP8 (SLC39A8), and DMT1. This pathway contributes to iron loading in the liver, heart, and pancreas, and is implicated in hereditary hemochromatosis and transfusional iron overload.
Key Genes Involved in GO:0006826 iron ion transport
The following genes encode proteins that directly mediate or regulate iron ion transport across species.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SLC11A2 (DMT1) | Ferrous iron uptake at plasma membrane and endosomes | Mutations cause microcytic anemia; target for iron chelation |
| SLC40A1 (Ferroportin) | Only known mammalian iron exporter | Mutations cause hemochromatosis type 4; target for iron overload therapy |
| TFRC (Transferrin receptor 1) | Uptake of transferrin-bound iron via endocytosis | Highly expressed in cancer; target for antibody-drug conjugates |
| SLC39A8 (ZIP8) | NTBI uptake; manganese and zinc transport | Polymorphisms linked to iron overload and neurodegeneration |
| SLC39A14 (ZIP14) | NTBI uptake in liver and pancreas | Deletion protects against iron overload in mice |
| FTH1 (Ferritin heavy chain) | Iron storage; ferroxidase activity | Regulates ferroptosis sensitivity |
| FTL (Ferritin light chain) | Iron storage | Mutations cause neuroferritinopathy |
| IRP1 (ACO1) | Iron regulatory protein; senses iron levels | Regulates DMT1 and TFRC mRNA stability |
| IRP2 (IREB2) | Iron regulatory protein; regulates iron homeostasis | Knockout mice develop neurodegeneration |
| HAMP (Hepcidin) | Regulates ferroportin degradation | Master regulator of systemic iron homeostasis |
| IRT1 (Arabidopsis) | Ferrous iron uptake in roots | Essential for plant iron acquisition |
| NRAMP1 (SLC11A1) | Iron transport in macrophages and plants | Linked to resistance to intracellular pathogens |
| YSL1 (Arabidopsis) | Iron-nicotianamine transport in vasculature | Required for seed iron loading |
| FPN1 (Arabidopsis) | Iron efflux from cells | Homolog of ferroportin; regulates iron distribution |
| Siderophore transporters (e.g., FhuA) | Ferric-siderophore uptake in bacteria | Target for antibiotic development |
| Ferrichelatases | Release iron from siderophores intracellularly | Novel drug targets in microbial pathogens |
How Is iron ion transport Regulated?
Iron ion transport is regulated at multiple levels to maintain iron homeostasis. The IRP/IRE system post-transcriptionally controls the expression of DMT1, TFRC, and ferroportin in response to cellular iron levels. Systemically, the hormone hepcidin binds to ferroportin, inducing its degradation and reducing iron export from enterocytes and macrophages. In plants, iron deficiency induces the expression of IRT1 and other uptake genes via transcription factors such as FIT and bHLH proteins. In bacteria, iron transport genes are regulated by the ferric uptake regulator (Fur) in response to iron availability. Additionally, ferroptosis, an iron-dependent cell death pathway, is regulated by iron transport and storage proteins, with implications for cancer therapy.
iron ion transport and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SLC40A1 | Hemochromatosis type 4 | Knock-in mouse with C326S mutation; ferroportin overexpression in hepatocytes |
| SLC11A2 (DMT1) | Microcytic anemia | Knockout zebrafish; point mutation in iron-binding site |
| FTL | Neuroferritinopathy | Knock-in mouse with FTL mutation; iPSC-derived neurons |
| TFRC | Cancer proliferation | CRISPR knockout in cancer cell lines; overexpression in normal cells |
| SLC39A14 (ZIP14) | Iron overload in liver | Liver-specific knockout mouse; overexpression in hepatocytes |
Iron overload disorders
Mutations in SLC40A1 (ferroportin) cause hereditary hemochromatosis type 4, characterized by iron accumulation in the liver, heart, and pancreas. DMT1 mutations can also lead to iron overload in specific tissues. NTBI transporters such as ZIP14 contribute to iron loading in transfusional iron overload.
Neurodegeneration and Alzheimer's disease
Regional brain iron accumulation correlates with transcriptional and cellular signatures in Alzheimer's disease, and iron transport dysregulation is implicated in neuronal death. Mutations in ferritin light chain (FTL) cause neuroferritinopathy, a neurodegenerative disorder with iron deposition in the brain. IRP2 knockout mice develop age-dependent neurodegeneration.
Cancer and ferroptosis
Cancer cells often upregulate iron uptake transporters such as TFRC and DMT1 to support rapid proliferation. Conversely, induction of ferroptosis, an iron-dependent form of cell death, is a promising therapeutic strategy, and iron transport proteins are key regulators of ferroptosis sensitivity.
Anemia of inflammation and iron deficiency
Inflammatory cytokines induce hepcidin, which degrades ferroportin and reduces iron export, leading to anemia of inflammation. DMT1 mutations cause microcytic anemia with iron malabsorption. Understanding iron transport is therefore critical for treating these common disorders.
From iron ion transport-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of DMT1 impair iron uptake? | CRISPR knockout of SLC11A2 in Caco-2 cells or mouse enteroids |
| Does a point mutation in ferroportin affect iron export? | Knock-in of C326S mutation in HEK293 cells or mouse models |
| Can overexpression of ZIP14 rescue iron overload? | Overexpression of SLC39A14 in hepatocytes or mice |
| Where is ferroportin localized in cells? | Tagged knock-in of SLC40A1 with GFP in HeLa cells |
| What genes regulate iron transport in plants? | CRISPR knockout of IRT1 in Arabidopsis thaliana |
| How does iron transport affect ferroptosis? | Knockout of FTH1 or TFRC in cancer cell lines followed by ferroptosis inducers |
How to Study the iron ion transport Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Radiolabeled iron uptake | Iron transport activity | Quantifying DMT1 or ferroportin function |
| Fluorescent iron sensors | Labile iron pool | Live-cell imaging of iron transport |
| RNA-seq | Transcriptional changes | Identifying iron transport gene expression signatures |
| Proteomics | Protein abundance and interactions | Detecting iron transporter complexes |
| CRISPR knockout screens | Gene essentiality for iron transport | Discovering novel regulators |
| Electrophysiology | Transporter currents | Characterizing DMT1 or ZIP8 activity |
| X-ray crystallography | Transporter structure | Understanding iron transport mechanism |
Radiolabeled iron uptake assays
Using 55Fe or 59Fe, researchers can measure iron transport activity in cultured cells or isolated membrane vesicles. This method is quantitative and can be applied to knockout or overexpression models to assess the functional impact of specific transporters.
Fluorescent iron sensors and imaging
Genetically encoded fluorescent sensors such as FerroOrange or Calcein-AM can monitor labile iron pools in live cells. Combined with confocal microscopy, this allows visualization of iron transport dynamics and subcellular localization.
Transcriptomics and proteomics
RNA-seq and quantitative proteomics can identify changes in iron transport gene expression under different iron conditions or in disease models. For example, RNA-seq of Alzheimer's disease brain tissue revealed iron transport signatures.
CRISPR screens for iron transport regulators
Genome-wide CRISPR knockout screens using iron-dependent reporters or ferroptosis inducers can identify novel genes involved in iron ion transport and homeostasis.
How CRISPR Can Be Used to Study GO:0006826 iron ion transport
Knockout
CRISPR knockout of iron transport genes such as SLC11A2 (DMT1) or SLC40A1 (ferroportin) in cell lines or animal models can reveal their essential roles in iron uptake and export. For example, DMT1 knockout mice exhibit severe anemia and iron deficiency. Knockout of TFRC in cancer cells reduces iron uptake and inhibits proliferation.
Point Mutation
Introducing disease-associated point mutations, such as the C326S mutation in ferroportin, using CRISPR base editing or homology-directed repair can model hemochromatosis and dissect the molecular basis of iron export defects. Similarly, point mutations in DMT1 can mimic microcytic anemia.
Knock-in
Knock-in of tagged versions of iron transporters (e.g., GFP-ferroportin) allows real-time tracking of protein localization and dynamics. Knock-in of human disease alleles into mouse models can recapitulate human iron overload disorders.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression of iron transport genes such as ZIP14 or ferroportin can rescue iron deficiency or induce iron overload in cellular models. Overexpression of FTH1 protects against ferroptosis.
How EDITGENE Supports iron ion transport Research
Researchers studying iron ion transport-related genes often need to determine whether a candidate gene is causally involved in iron uptake, export, or homeostasis. CRISPR-based models provide precise tools to manipulate these genes and assess their functional consequences in relevant cell types.
Contact EDITGENE today to design your custom CRISPR model for iron ion transport research.
Frequently Asked Questions About iron ion transport
What is iron ion transport (GO:0006826)?
Iron ion transport is the directed movement of iron ions into, out of, or within cells, mediated by transporters or pores, as defined by the Gene Ontology.
What genes are involved in iron ion transport?
Key genes include SLC11A2 (DMT1), SLC40A1 (ferroportin), TFRC, SLC39A8 (ZIP8), SLC39A14 (ZIP14), and in plants IRT1, NRAMP, and YSL.
How is iron ion transport regulated?
It is regulated by the IRP/IRE system, hepcidin-ferroportin axis, and transcription factors like Fur in bacteria.
What diseases are associated with defective iron ion transport?
Diseases include hemochromatosis, microcytic anemia, neurodegeneration, and cancer.
What is the role of DMT1 in iron transport?
DMT1 (SLC11A2) transports ferrous iron across the plasma membrane and endosomal membrane, and mutations cause microcytic anemia.
How does ferroportin export iron?
Ferroportin (SLC40A1) is the only known mammalian iron exporter, moving iron from cells into plasma; its activity is regulated by hepcidin.
What is non-transferrin-bound iron (NTBI) transport?
NTBI transport is the uptake of iron not bound to transferrin, mediated by transporters like ZIP14 and ZIP8, and contributes to iron overload.
How can CRISPR be used to study iron ion transport?
CRISPR knockout, point mutation, knock-in, and overexpression models allow precise manipulation of iron transport genes to study their function and disease relevance.
What methods are used to measure iron transport?
Methods include radiolabeled iron uptake, fluorescent iron sensors, RNA-seq, proteomics, and CRISPR screens.
Why is iron ion transport important in plants?
Plants require iron for photosynthesis and respiration; transporters like IRT1 are essential for iron uptake from soil.
Conclusion
Iron ion transport (GO:0006826) is a fundamental biological process that ensures adequate iron supply while preventing toxicity. Its dysregulation underlies numerous human diseases, from anemia to neurodegeneration, and it is a key vulnerability in cancer. Research using CRISPR models and advanced omics is rapidly expanding our understanding of the molecular players and regulatory networks involved. EDITGENE provides comprehensive CRISPR services to accelerate discoveries in iron ion transport biology.
References
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- 3. Yanatori I et al.. 2019. DMT1 and iron transport.. Free Radic Biol Med 133:55-63 PMID: 30055235
- 4. Merrick CE et al.. 2024. Siderophore-dependent ferrichelatases.. Methods Enzymol 702:281-315 PMID: 39155116
- 5. Knutson MD. 2019. Non-transferrin-bound iron transporters.. Free Radic Biol Med 133:101-111 PMID: 30316781
- 6. Kobayashi T et al.. 2019. Iron transport and its regulation in plants.. Free Radic Biol Med 133:11-20 PMID: 30385345
- 8. Yang A et al.. 2025. Regional brain iron correlates with transcriptional and cellular signatures in Alzheimer's disease.. Alzheimers Dement 21(1):e14459 PMID: 39876820
