GO:0071307 cellular response to vitamin K: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0071307 describes how a cell changes its state or activity in response to a vitamin K stimulus, including movement, secretion, enzyme production and gene expression.
• The vitamin K cycle, driven by VKORC1/VKORC1L1 and gamma-glutamyl carboxylase (GGCX), is the central biochemical engine of the cellular response to vitamin K.
• Vitamin K-dependent carboxylation of proteins such as osteocalcin and matrix Gla protein controls calcium flux and metabolic adaptation in beta cells and bone-forming cells.
• Vitamin K and its quinone forms influence redox balance, DNA damage responses and ferroptosis, linking GO:0071307 to cancer chemosensitization and endothelial repair.
• Loss of VKORC1L1-mediated vitamin K recycling sensitizes endothelial cells to ferroptosis, showing that this GO term has direct disease relevance.
• CRISPR knockout, point-mutation, knock-in and overexpression models are essential to test which genes causally mediate the cellular response to vitamin K.
Description
GO:0071307, cellular response to vitamin K, is a biological process Gene Ontology term that captures any change in a cell's state or activity, such as movement, secretion, enzyme production or gene expression, that occurs as a result of a vitamin K stimulus. Vitamin K is best known as a cofactor for gamma-glutamyl carboxylase (GGCX), the enzyme that modifies glutamate residues in vitamin K-dependent proteins, but the cellular response extends far beyond clotting factor maturation. The vitamin K cycle continuously recycles the reduced hydroquinone form of vitamin K through the action of VKORC1 and VKORC1L1, and this recycling is now recognized as a redox-protective mechanism that counters ferroptosis and supports endothelial repair. Because the term is defined by the cellular response rather than by a single pathway, researchers study it across bone biology, pancreatic beta cell physiology, cancer chemosensitization and vascular biology. Understanding GO:0071307 therefore requires integrating enzymology, redox biology, calcium signaling and transcriptional responses to vitamin K exposure.
cellular response to vitamin K At A Glance
| GO ID | GO:0071307 |
|---|---|
| GO term | cellular response to vitamin K |
| Ontology | biological_process |
| Synonym | none |
| Major function | Cellular adaptation to vitamin K stimulus, including vitamin K-dependent carboxylation, redox regulation and gene expression changes |
| Key enzymes | GGCX, VKORC1, VKORC1L1, NQO1 and related redox enzymes |
| Key downstream proteins | Osteocalcin, matrix Gla protein, Gas6 and other vitamin K-dependent proteins |
| Disease relevance | Osteoporosis, cancer chemosensitization, endothelial ferroptosis and metabolic stress |
| Research methods | CRISPR knockout, point mutation, knock-in, overexpression, RNA-seq, proteomics and redox sensors |
What Is GO:0071307?
In our own words, GO:0071307 is the collection of cellular processes triggered when a cell encounters vitamin K. It is not limited to vitamin K metabolism itself; it includes downstream changes in gene expression, enzyme activity, secretion, movement and other cellular activities that result from the vitamin K stimulus. The term sits under biological_process and is defined by the QuickGO definition as any process that results in a change in state or activity of a cell as a result of a vitamin K stimulus.
Why Is cellular response to vitamin K Important in Cell Biology?
GO:0071307 matters because vitamin K is not only a clotting cofactor but also a regulator of cellular redox balance, calcium handling and stress adaptation. The vitamin K cycle, through VKORC1L1, recycles vitamin K and protects endothelial cells from ferroptosis, a form of iron-dependent cell death. In beta cells, vitamin K-dependent carboxylation regulates calcium flux and adaptation to metabolic stress, linking this GO term to diabetes research. In bone, vitamin K2 activates the NRF2/FSP1 pathway to inhibit osteoblast ferroptosis and protect against glucocorticoid-induced osteoporosis. Vitamin K also acts as a cancer chemosensitizer, and its quinone forms can influence DNA damage responses. Because these functions are cell-type specific, researchers need causal models to determine which genes mediate the response to vitamin K in each context.
• Defines how cells sense and respond to vitamin K, a fat-soluble vitamin with roles beyond coagulation.
• Central to vitamin K-dependent carboxylation of osteocalcin and matrix Gla protein in bone and vascular cells.
• Controls calcium flux and metabolic stress adaptation in pancreatic beta cells.
• Protects endothelial cells from ferroptosis through VKORC1L1-mediated vitamin K recycling.
• Modulates redox balance and DNA damage responses, with implications for cancer therapy.
• Supports bone health by activating NRF2/FSP1 signaling and inhibiting osteoblast ferroptosis.
• Provides a mechanistic framework for vitamin K chemosensitization in cancer treatment.
• Requires CRISPR models to distinguish causal genes from correlative expression changes.
• Connects nutrition, enzymology and cell death pathways in a single GO term.
• Offers translational targets for osteoporosis, vascular disease and metabolic disorders.
What Happens During cellular response to vitamin K?
Vitamin K uptake and redox cycling
In simple terms: The cell takes up vitamin K and converts it between oxidized and reduced forms to keep the cycle running.
The cellular response to vitamin K begins with uptake of the vitamin and its entry into the vitamin K cycle. In this cycle, vitamin K epoxide is reduced back to the hydroquinone form by VKORC1 and VKORC1L1, providing the reduced cofactor needed for gamma-glutamyl carboxylase (GGCX). VKORC1L1-mediated recycling is especially important in endothelial cells, where it counters ferroptosis and promotes repair. This redox cycling is a defining early step of GO:0071307 because it determines whether the cell can sustain vitamin K-dependent reactions.
Gamma-glutamyl carboxylation of target proteins
In simple terms: The cell uses vitamin K to add a chemical tag to certain proteins so they can bind calcium.
The reduced form of vitamin K serves as a cofactor for GGCX, which carboxylates specific glutamate residues in vitamin K-dependent proteins such as osteocalcin, matrix Gla protein and Gas6. This carboxylation enables these proteins to bind calcium and function in bone mineralization, vascular calcification and cell signaling. In beta cells, vitamin K-dependent carboxylation regulates calcium flux and adaptation to metabolic stress, showing that this step is not limited to the liver. The carboxylation reaction is a hallmark of the cellular response to vitamin K and is directly dependent on the vitamin K cycle.
Calcium signaling and metabolic adaptation
In simple terms: The tagged proteins help the cell manage calcium, which affects how it handles stress and energy.
Vitamin K-dependent carboxylation influences calcium flux in pancreatic beta cells, where it supports adaptation to metabolic stress. This calcium signaling is part of the broader cellular response to vitamin K, linking the vitamin to insulin secretion and beta cell survival. In bone-forming cells, vitamin K2 activates the NRF2/FSP1 pathway to inhibit osteoblast ferroptosis, a process that also involves calcium and redox balance. Thus, calcium handling is a key downstream component of GO:0071307.
Redox regulation and ferroptosis protection
In simple terms: Vitamin K helps the cell avoid a type of iron-dependent cell death called ferroptosis.
Vitamin K and its quinone forms act as antioxidants and influence redox-sensitive pathways. VKORC1L1-mediated vitamin K recycling specifically counters ferroptosis in endothelial cells, promoting endothelial repair. In osteoblasts, vitamin K2 activates NRF2/FSP1 signaling to inhibit ferroptosis and protect against glucocorticoid-induced osteoporosis. These findings show that the cellular response to vitamin K includes a strong redox-protective component that can be studied with fluorescent redox sensors such as roGFP2-Orp1.
Gene expression and stress response programs
In simple terms: Vitamin K changes which genes the cell turns on or off, helping it adapt to stress.
Exposure to vitamin K can alter gene expression programs, including those involved in antioxidant defense, DNA damage responses and cell survival. Vitamin K has been described as a novel cancer chemosensitizer, suggesting that it modulates transcriptional and signaling networks that affect chemotherapy response. In yeast, environmental changes trigger large-scale expression programs that can serve as a model for studying cellular responses to vitamins and other stimuli. These gene expression changes are a core part of the cellular response to vitamin K and can be mapped by RNA-seq and related methods.
Key Genes Involved in GO:0071307 cellular response to vitamin K
The following genes and proteins are central to the cellular response to vitamin K, based on published literature on the vitamin K cycle, carboxylation, redox regulation and disease models.
| Gene | Major Role | Research Relevance |
|---|---|---|
| GGCX | Gamma-glutamyl carboxylase that uses reduced vitamin K to carboxylate glutamate residues in target proteins | Core enzyme of vitamin K-dependent carboxylation; knockout models reveal loss of carboxylation and calcium binding |
| VKORC1 | Vitamin K epoxide reductase that recycles vitamin K to its reduced form | Essential for the vitamin K cycle; point mutations affect recycling efficiency and warfarin sensitivity |
| VKORC1L1 | Vitamin K epoxide reductase-like protein that recycles vitamin K and protects endothelial cells from ferroptosis | Key mediator of endothelial repair; knockout increases ferroptosis sensitivity |
| NQO1 | NAD(P)H quinone dehydrogenase 1, a redox enzyme influenced by vitamin K quinones | Links vitamin K to redox balance and DNA damage responses |
| NFE2L2 (NRF2) | Transcription factor that activates antioxidant and ferroptosis-protective genes | Mediates vitamin K2 protection against osteoblast ferroptosis |
| FSP1 | Ferroptosis suppressor protein 1, part of the NRF2/FSP1 axis | Downstream effector of vitamin K2-mediated ferroptosis inhibition in osteoblasts |
| BGLAP (Osteocalcin) | Vitamin K-dependent protein involved in bone mineralization | Readout of vitamin K-dependent carboxylation in bone models |
| MGP (Matrix Gla protein) | Vitamin K-dependent inhibitor of vascular calcification | Marker of carboxylation status in vascular and bone research |
| GAS6 | Vitamin K-dependent ligand for TAM receptors | Links vitamin K-dependent carboxylation to cell signaling and survival |
| PROC (Protein C) | Vitamin K-dependent anticoagulant protein | Classic readout of the vitamin K cycle and carboxylation |
| F2 (Prothrombin) | Vitamin K-dependent clotting factor | Historical model for vitamin K-dependent carboxylation |
| F9 (Factor IX) | Vitamin K-dependent clotting factor | Used to study vitamin K cycle defects and warfarin response |
| PROS1 (Protein S) | Vitamin K-dependent anticoagulant protein | Readout of vitamin K-dependent carboxylation in liver and other cells |
| GGCX variants | Mutations in GGCX cause defects in vitamin K-dependent carboxylation | Point-mutation models can dissect substrate recognition and disease mechanisms |
| VKORC1 variants | Polymorphisms affect vitamin K recycling and drug response | Knock-in models can test allele-specific effects on the vitamin K cycle |
| SLC25A24 | Mitochondrial carrier implicated in vitamin K-dependent redox and calcium handling | Candidate for metabolic stress studies in beta cells |
| TXNRD1 | Thioredoxin reductase involved in redox homeostasis influenced by vitamin K | Redox sensor studies can link vitamin K to thiol oxidation |
| GPX4 | Glutathione peroxidase 4, a key ferroptosis regulator | Vitamin K recycling opposes ferroptosis; GPX4 is a comparative control |
How Is cellular response to vitamin K Regulated?
The cellular response to vitamin K is regulated at multiple levels. The vitamin K cycle itself is controlled by the expression and activity of VKORC1 and VKORC1L1, which determine the availability of reduced vitamin K for GGCX. VKORC1L1-mediated recycling is particularly important under oxidative stress, where it counters ferroptosis and supports endothelial repair. Downstream, the NRF2/FSP1 pathway is activated by vitamin K2 in osteoblasts, providing a transcriptional feedback loop that protects against ferroptosis. Redox-sensitive signaling, including thiol oxidation monitored by roGFP2-Orp1, can further modulate the response to vitamin K and related quinones. In beta cells, metabolic stress and calcium flux influence the extent of vitamin K-dependent carboxylation, suggesting that nutrient and stress signals integrate with the vitamin K cycle. Together, these layers of regulation ensure that the cellular response to vitamin K is context-dependent and tightly coupled to redox and metabolic status.
cellular response to vitamin K and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| VKORC1L1 | Endothelial ferroptosis and impaired vascular repair | Endothelial cell knockout and rescue with wild-type or point-mutant VKORC1L1 |
| NFE2L2 (NRF2) | Glucocorticoid-induced osteoporosis and osteoblast ferroptosis | Osteoblast knockout and vitamin K2 treatment with ferroptosis readouts |
| FSP1 | Ferroptosis suppression in bone and other tissues | Knockout and overexpression in osteoblasts or cancer cells |
| GGCX | Defective vitamin K-dependent carboxylation and clotting factor function | Liver or bone cell knockout with carboxylation assays |
| VKORC1 | Warfarin sensitivity and vitamin K cycle defects | Knock-in of patient variants and dose-response to vitamin K |
Osteoporosis and bone metabolism
Vitamin K2 protects against glucocorticoid-induced osteoporosis by activating the NRF2/FSP1 pathway to inhibit osteoblast ferroptosis. This links GO:0071307 directly to bone-forming cell survival and bone mineral density. Vitamin K-dependent carboxylation of osteocalcin is a well-established marker of bone health, and defects in the vitamin K cycle can impair bone mineralization. Research models that manipulate VKORC1L1, NRF2 or FSP1 can test whether vitamin K-dependent ferroptosis protection is causal in osteoporosis.
Cancer chemosensitization and DNA damage
Vitamin K has been described as a novel cancer chemosensitizer, meaning it can enhance the effect of chemotherapy drugs. Vitamin K quinones also contribute to DNA damage responses, which may be advantageous or disadvantageous depending on context. These findings connect GO:0071307 to cancer cell survival, redox balance and treatment response. CRISPR knockout of vitamin K cycle genes can help determine whether the chemosensitizing effect depends on carboxylation or on redox cycling.
Endothelial ferroptosis and vascular repair
VKORC1L1-mediated vitamin K recycling counters ferroptosis to promote endothelial repair. This places the cellular response to vitamin K at the center of vascular biology and suggests that defects in vitamin K recycling could impair endothelial regeneration. Ferroptosis is an iron-dependent cell death pathway, and vitamin K recycling acts as a protective mechanism. Endothelial cell models with VKORC1L1 knockout or point mutations can be used to test this mechanism.
Metabolic stress and beta cell function
Vitamin K-dependent carboxylation regulates calcium flux and adaptation to metabolic stress in beta cells. This links GO:0071307 to pancreatic islet biology and glucose homeostasis. Beta cell models can be used to study how vitamin K-dependent proteins influence calcium signaling and survival under metabolic stress. The vitamin K cycle may therefore be a target for preserving beta cell function in metabolic disease.
From cellular response to vitamin K-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of VKORC1L1 increase ferroptosis in endothelial cells? | VKORC1L1 knockout endothelial cells with ferroptosis inducers and vitamin K rescue |
| Does vitamin K2 protect osteoblasts via NRF2/FSP1? | NRF2 or FSP1 knockout osteoblasts treated with vitamin K2 and glucocorticoids |
| Does GGCX carboxylation control beta cell calcium flux? | GGCX knockout beta cells with calcium imaging and metabolic stress |
| Do VKORC1 variants alter vitamin K recycling? | VKORC1 point-mutation knock-in cells with vitamin K cycle assays |
| Can vitamin K chemosensitize cancer cells? | Cancer cell lines with vitamin K cycle gene knockouts and chemotherapy treatment |
| Does vitamin K alter redox-sensitive gene expression? | RNA-seq of cells treated with vitamin K and redox sensors such as roGFP2-Orp1 |
How to Study the cellular response to vitamin K Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout | Loss-of-function effects on vitamin K response genes | Testing whether VKORC1L1 or NRF2 is required for ferroptosis protection |
| Point mutation knock-in | Specific residue contributions to vitamin K recycling or carboxylation | Modeling VKORC1 or GGCX variants |
| RNA-seq | Global gene expression changes after vitamin K exposure | Mapping antioxidant and DNA damage response programs |
| Redox sensor imaging | Intracellular H2O2 and thiol redox dynamics | Monitoring vitamin K effects on redox balance |
| Ferroptosis assays | Lipid peroxidation and iron-dependent cell death | Testing vitamin K recycling protection in endothelial or bone cells |
| Carboxylation assays | Gamma-carboxyglutamate formation in target proteins | Validating GGCX function and vitamin K cycle activity |
| Calcium imaging | Calcium flux in beta cells and other cell types | Studying vitamin K-dependent metabolic adaptation |
| Proteomics | Protein abundance and modification changes | Identifying vitamin K-dependent proteins and pathways |
CRISPR knockout and point mutation
CRISPR knockout of GGCX, VKORC1, VKORC1L1, NRF2 or FSP1 can test which genes are required for the cellular response to vitamin K. Point mutations can dissect specific residues involved in vitamin K recycling or carboxylation, as shown by studies of VKORC1 variants. These models are essential for distinguishing causal mechanisms from correlative changes.
Transcriptomics and gene expression profiling
RNA-seq can map the gene expression changes that occur when cells are exposed to vitamin K, revealing antioxidant, DNA damage and metabolic pathways. Yeast environmental stress response studies provide a framework for analyzing large-scale expression programs. Combining transcriptomics with CRISPR perturbations can identify the genes that drive the response.
Redox sensors and ferroptosis assays
Fluorescent redox sensors such as roGFP2-Orp1 can monitor hydrogen peroxide and thiol redox changes in living cells treated with vitamin K or related quinones. Ferroptosis assays, including lipid peroxidation and cell viability measurements, can test whether vitamin K recycling protects cells from iron-dependent death. These methods directly measure the redox-protective arm of GO:0071307.
Proteomics and carboxylation assays
Proteomic detection of gamma-carboxyglutamate residues can identify which proteins are carboxylated in response to vitamin K. Carboxylation assays for osteocalcin, matrix Gla protein and clotting factors provide quantitative readouts of the vitamin K cycle. These methods are useful for validating CRISPR models of GGCX and VKORC1 function.
How CRISPR Can Be Used to Study GO:0071307 cellular response to vitamin K
Knockout
CRISPR knockout of VKORC1L1, GGCX, NRF2 or FSP1 can reveal which genes are essential for the cellular response to vitamin K. For example, VKORC1L1 knockout endothelial cells show increased ferroptosis, demonstrating a causal role in vitamin K recycling. Knockout of NRF2 or FSP1 in osteoblasts can test whether vitamin K2 protection depends on the NRF2/FSP1 axis. These models are foundational for GO:0071307 research.
Point Mutation
Point mutations in VKORC1 or GGCX can model patient variants and dissect catalytic residues involved in vitamin K recycling and carboxylation. Such models help explain warfarin sensitivity and vitamin K cycle defects. Point mutations can also be used to separate enzymatic activity from protein-protein interactions in the cellular response to vitamin K.
Knock-in
Knock-in of tagged or disease-associated alleles allows precise tracking of vitamin K cycle proteins and their localization. For example, tagging VKORC1L1 can reveal its dynamic recycling and interaction partners during ferroptosis protection. Knock-in models are also useful for studying allele-specific effects on vitamin K-dependent carboxylation.
Overexpression
Overexpression of VKORC1L1, GGCX or NRF2 can test whether increased vitamin K recycling or antioxidant signaling enhances protection against ferroptosis or metabolic stress. Overexpression models can also reveal dominant-negative or gain-of-function effects of vitamin K cycle genes. These experiments complement knockout studies to establish causality in GO:0071307.
How EDITGENE Supports cellular response to vitamin K Research
Researchers studying cellular response to vitamin K-related genes often need to determine whether a candidate gene is causally involved in vitamin K-dependent carboxylation, redox protection or ferroptosis resistance. EDITGENE provides CRISPR-based cell model services that enable precise knockout, point mutation, knock-in and overexpression of genes such as VKORC1L1, GGCX, NRF2 and FSP1, helping teams move from correlation to mechanism.
Contact EDITGENE today to design your custom CRISPR model for cellular response to vitamin K research.
Frequently Asked Questions About cellular response to vitamin K
What is GO:0071307 cellular response to vitamin K?
GO:0071307 is a Gene Ontology biological process term describing any change in a cell's state or activity, such as movement, secretion, enzyme production or gene expression, that occurs as a result of a vitamin K stimulus.
What genes are involved in cellular response to vitamin K?
Key genes include GGCX, VKORC1, VKORC1L1, NQO1, NFE2L2 (NRF2), FSP1, BGLAP, MGP, GAS6 and clotting factors such as PROC, F2 and F9.
How does vitamin K protect cells from ferroptosis?
VKORC1L1-mediated vitamin K recycling counters ferroptosis, and vitamin K2 activates the NRF2/FSP1 pathway to inhibit osteoblast ferroptosis.
What is the vitamin K cycle?
The vitamin K cycle is a series of reactions in which vitamin K epoxide is reduced back to the hydroquinone form by VKORC1 and VKORC1L1, providing the reduced cofactor for gamma-glutamyl carboxylase (GGCX).
How is vitamin K-dependent carboxylation studied?
Carboxylation is studied by detecting gamma-carboxyglutamate residues in proteins such as osteocalcin and matrix Gla protein, often using proteomics or specific assays after CRISPR knockout of GGCX.
Can CRISPR be used to study cellular response to vitamin K?
Yes, CRISPR knockout, point mutation, knock-in and overexpression models are used to test which genes are causally required for vitamin K-dependent carboxylation, redox protection and ferroptosis resistance.
What diseases are linked to cellular response to vitamin K?
Osteoporosis, endothelial ferroptosis, vascular calcification, metabolic stress in beta cells and cancer chemosensitization have been linked to vitamin K-dependent processes.
What methods measure the cellular response to vitamin K?
RNA-seq, redox sensor imaging, ferroptosis assays, carboxylation assays, calcium imaging and proteomics are commonly used.
Why is VKORC1L1 important in endothelial cells?
VKORC1L1 recycles vitamin K and protects endothelial cells from ferroptosis, promoting endothelial repair.
How does vitamin K affect beta cells?
Vitamin K-dependent carboxylation regulates calcium flux and adaptation to metabolic stress in beta cells.
Conclusion
GO:0071307, cellular response to vitamin K, encompasses the vitamin K cycle, gamma-glutamyl carboxylation, calcium signaling, redox regulation and ferroptosis protection. These processes are essential for bone health, endothelial repair, beta cell function and cancer chemosensitization. CRISPR-based cell models are powerful tools to determine which genes causally mediate these responses and to identify new therapeutic targets.
References
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- 4. Gul S et al.. 2022. Vitamin K: A novel cancer chemosensitizer.. Biotechnol Appl Biochem 69(6):2641-2657 PMID: 34993998
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- 6. Nietzel T et al.. 2019. The fluorescent protein sensor roGFP2-Orp1 monitors in vivo H(2) O(2) and thiol redox integration and elucidates intracellular H(2) O(2) dynamics during elicitor-induced oxidative burst in Arabidopsis.. New Phytol 221(3):1649-1664 PMID: 30347449
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