GO:0046653 tetrahydrofolate metabolic process: One-Carbon Metabolism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0046653 tetrahydrofolate metabolic process describes the chemical reactions and pathways involving tetrahydrofolate (THF), the reduced folate cofactor central to one-carbon transfer reactions.
• THF and its derivatives carry one-carbon units at different oxidation states, supporting de novo purine and thymidylate synthesis, methionine regeneration, and mitochondrial translation.
• The pathway is compartmentalized between cytosol and mitochondria, with serine hydroxymethyltransferase (SHMT2) and methylenetetrahydrofolate dehydrogenase 2 (MTHFD2) being key mitochondrial enzymes.
• Folate-dependent tRNA methylation in mitochondria is essential for mitochondrial translation, linking tetrahydrofolate metabolism directly to bioenergetics.
• Dysregulated tetrahydrofolate metabolism contributes to tumorigenesis, chemotherapy resistance, and vascular disease.
• CRISPR knockout, point-mutation, knock-in, and overexpression models enable causal dissection of genes in this pathway.
Description
Tetrahydrofolate (THF) is the biologically active form of folate and serves as the principal one-carbon carrier in cellular metabolism. The Gene Ontology term GO:0046653, tetrahydrofolate metabolic process, encompasses all chemical reactions and pathways involving THF, including its synthesis, interconversion among polyglutamated forms, and its role as a cofactor in one-carbon transfer reactions. This process is fundamental to nucleotide biosynthesis, amino acid homeostasis, and methylation reactions, and its dysfunction is implicated in a wide range of human diseases. Research into tetrahydrofolate metabolism has gained renewed attention because of its compartmentalization between cytosol and mitochondria and its connections to tumorigenesis, chemotherapy resistance, and mitochondrial translation. For example, mitochondrial folate cycle enzymes such as MTHFD2 and SHMT2 support de novo purine synthesis and are sensitive to succinylation-mediated regulation. Moreover, folate-dependent tRNA methylation is required for efficient mitochondrial translation, underscoring the pathway's role in bioenergetics. Understanding GO:0046653 is therefore essential for researchers studying cancer metabolism, nutritional biochemistry, and mitochondrial biology. This article synthesizes authoritative QuickGO annotations and verified PubMed literature to provide a research-grade overview of the pathway, its key genes, disease links, and experimental strategies for functional validation.
tetrahydrofolate metabolic process At A Glance
| GO ID | GO:0046653 |
|---|---|
| GO term | tetrahydrofolate metabolic process |
| Ontology | biological_process |
| Synonym | tetrahydrofolate metabolism |
| Definition | The chemical reactions and pathways involving tetrahydrofolate, 5,6,7,8-tetrahydrofolic acid, a folate derivative bearing additional hydrogens on the pterin group. |
| Major function | One-carbon transfer for nucleotide synthesis, amino acid metabolism, and methylation reactions |
| Subcellular location | Cytosol and mitochondria |
| Key cofactor forms | THF, 5,10-methylene-THF, 10-formyl-THF, 5-methyl-THF |
| Related pathways | Folate cycle, methionine cycle, purine and thymidylate biosynthesis |
What Is GO:0046653?
According to the Gene Ontology, GO:0046653 tetrahydrofolate metabolic process is defined as the chemical reactions and pathways involving tetrahydrofolate, 5,6,7,8-tetrahydrofolic acid, a folate derivative bearing additional hydrogens on the pterin group. In simpler terms, it covers all the biochemical steps that produce, modify, and utilize THF as a one-carbon carrier in the cell.
Why Is tetrahydrofolate metabolic process Important in Cell Biology?
Tetrahydrofolate metabolic process is essential for cell proliferation and survival because it supplies one-carbon units for de novo purine and thymidylate synthesis, methionine regeneration, and mitochondrial translation. Its dysregulation is linked to cancer, chemotherapy resistance, and vascular disease, making it a critical area for both basic and translational research.
• Supports de novo purine and thymidylate synthesis, which are required for DNA replication and repair.
• Provides methyl groups for methionine synthesis and global DNA methylation.
• Enables mitochondrial translation through folate-dependent tRNA methylation.
• Is reprogrammed in many cancers to sustain proliferation and survival.
• Contributes to chemotherapy resistance via mitochondrial tetrahydrofolate signaling.
• Links nutritional folate status to vascular health and disease.
• Is a target for antifolate drugs used in cancer and inflammatory diseases.
• Shows cross-species relevance, including in dairy cow nutrition and methyl donor metabolism.
• Can be modulated by succinylation and other post-translational modifications.
• Offers multiple nodes for CRISPR-based functional genomics.
What Happens During tetrahydrofolate metabolic process?
Folate uptake and reduction to THF
In simple terms: The cell takes up folate and chemically converts it into its active form, THF.
Dietary folates are transported into cells and reduced to dihydrofolate and then to tetrahydrofolate by dihydrofolate reductase (DHFR). This step is essential for generating the active one-carbon carrier. Clinical pharmacokinetic studies show that different folate forms, such as folic acid and L-5-methyltetrahydrofolate, have distinct bioavailability and metabolic fates.
One-carbon unit interconversion
In simple terms: THF picks up and passes around one-carbon units in different chemical forms.
THF derivatives interconvert among 5,10-methylene-THF, 10-formyl-THF, and 5-methyl-THF. These reactions are catalyzed by serine hydroxymethyltransferase (SHMT), methylenetetrahydrofolate dehydrogenase (MTHFD), and methylenetetrahydrofolate reductase (MTHFR). This interconversion is central to the folate cycle and is required for nucleotide synthesis and methylation.
Mitochondrial folate cycle
In simple terms: Mitochondria run their own version of the folate cycle to support their own protein production.
The mitochondrial folate cycle, involving SHMT2, MTHFD2, and MTHFD1L, generates formate and glycine and supports de novo purine synthesis. Succinylation of mitochondrial folate enzymes can suppress this pathway, linking metabolic stress to reduced purine synthesis. Mitochondrial folate metabolism also provides one-carbon units for tRNA methylation, which is required for mitochondrial translation.
Nucleotide and amino acid biosynthesis
In simple terms: THF helps build the building blocks of DNA and RNA and some amino acids.
10-formyl-THF is used in de novo purine synthesis, while 5,10-methylene-THF is used for thymidylate synthesis. These reactions are essential for DNA replication and repair. Disruption of THF metabolism leads to nucleotide imbalance and cell cycle arrest.
Methionine cycle and methylation
In simple terms: THF helps recycle methionine, which the cell uses to attach methyl marks to DNA and proteins.
5-methyl-THF donates a methyl group to homocysteine to regenerate methionine, a reaction catalyzed by methionine synthase. Methionine is then converted to S-adenosylmethionine (SAM), the universal methyl donor for DNA and protein methylation. This links tetrahydrofolate metabolism to epigenetic regulation and vascular health.
Key Genes Involved in GO:0046653 tetrahydrofolate metabolic process
The following genes encode enzymes and transporters that directly participate in or regulate tetrahydrofolate metabolic process.
| Gene | Major Role | Research Relevance |
|---|---|---|
| DHFR | Reduces dihydrofolate to tetrahydrofolate | Target of methotrexate; essential for THF supply |
| MTHFR | Converts 5,10-methylene-THF to 5-methyl-THF | Common polymorphisms affect folate status and disease risk |
| MTHFD1 | Cytosolic trifunctional enzyme in folate cycle | Supports purine synthesis and methylation |
| MTHFD2 | Mitochondrial methylenetetrahydrofolate dehydrogenase | Regulated by succinylation; linked to purine synthesis |
| MTHFD1L | Mitochondrial 10-formyl-THF synthetase | Generates formate for cytosolic one-carbon pool |
| SHMT1 | Cytosolic serine hydroxymethyltransferase | Provides one-carbon units from serine |
| SHMT2 | Mitochondrial serine hydroxymethyltransferase | Essential for mitochondrial one-carbon metabolism and translation |
| MTR | Methionine synthase; uses 5-methyl-THF | Links folate cycle to methionine and methylation |
| MTHFS | Methenyltetrahydrofolate synthetase | Regulates 10-formyl-THF levels |
| SLC19A1 | Reduced folate carrier | Mediates cellular uptake of folates |
| FOLR1 | Folate receptor alpha | Mediates folate transport; target in cancer therapy |
| GART | Phosphoribosylglycinamide formyltransferase | Uses 10-formyl-THF for purine synthesis |
| ATIC | AICAR transformylase/IMP cyclohydrolase | Uses 10-formyl-THF in purine synthesis |
| TYMS | Thymidylate synthase | Uses 5,10-methylene-THF for dTMP synthesis |
| MTHFD2L | Mitochondrial MTHFD2-like enzyme | Contributes to mitochondrial folate cycle |
| FTCD | Formimidoyltransferase cyclodeaminase | Links histidine catabolism to folate pool |
| MTRR | Methionine synthase reductase | Maintains methionine synthase activity |
How Is tetrahydrofolate metabolic process Regulated?
Tetrahydrofolate metabolic process is regulated at multiple levels. Enzyme expression is controlled by nutrient-sensing pathways and transcription factors responsive to folate status. Post-translational modifications, such as succinylation of mitochondrial folate enzymes, can suppress pathway activity under metabolic stress. Additionally, the pathway is compartmentalized, and mitochondrial folate metabolism is coordinated with mitochondrial translation through tRNA methylation. Nutritional status, including methyl donor availability, further modulates flux through the pathway.
tetrahydrofolate metabolic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| MTHFD2 | Cancer proliferation and chemotherapy resistance | Knockout in cancer cell lines; xenograft models |
| SHMT2 | Mitochondrial translation defects and metabolic stress | Point mutation or knockout in HAP1 cells |
| MTHFR | Vascular disease and hyperhomocysteinemia | Knock-in of common polymorphisms in mice |
| DHFR | Methotrexate resistance in leukemia | Overexpression and point mutation models |
| TYMS | Chemoresistance in colorectal cancer | Knockout and knock-in of resistance alleles |
Cancer metabolism and chemotherapy resistance
Many cancers reprogram one-carbon metabolism to support rapid proliferation. Upregulation of mitochondrial folate enzymes such as MTHFD2 and SHMT2 provides one-carbon units for purine synthesis and redox homeostasis. Succinate accumulation can suppress de novo purine synthesis through succinylation-mediated control of the mitochondrial folate cycle, contributing to metabolic adaptation. Moreover, non-canonical dihydrolipoyl transacetylase promotes chemotherapy resistance via mitochondrial tetrahydrofolate signaling, highlighting the pathway as a therapeutic target.
Vascular disease and nutritional deficiencies
Folate and tetrahydrofolate metabolism are closely linked to vascular health. Elevated homocysteine, a marker of impaired folate cycle, is associated with endothelial dysfunction and cardiovascular risk. Clinical studies comparing folic acid and L-5-methyltetrahydrofolate show differences in pharmacokinetics that may affect therapeutic strategies. Folate supplementation remains a public health measure to prevent neural tube defects and support vascular function.
Mitochondrial translation and ribosomopathies
Mitochondrial translation requires folate-dependent tRNA methylation, and disruption of this process impairs oxidative phosphorylation. This links tetrahydrofolate metabolism to mitochondrial diseases and potentially to ribosomopathies. Mutations in genes such as MTHFD2 or SHMT2 could compromise mitochondrial function and cellular bioenergetics.
From tetrahydrofolate metabolic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of MTHFD2 impair tumor growth? | CRISPR knockout in cancer cell lines and mouse xenografts |
| How do MTHFR polymorphisms affect enzyme activity? | Point mutation knock-in in isogenic cell lines |
| Can SHMT2 rescue mitochondrial translation? | Knock-in of tagged SHMT2 for localization studies |
| Does overexpression of DHFR confer methotrexate resistance? | Overexpression cell models |
| What is the role of MTHFD1L in formate production? | Knockout and metabolic rescue |
| How does succinylation regulate MTHFD2? | Point mutation of succinylation sites |
How to Study the tetrahydrofolate metabolic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| LC-MS metabolomics | Folate species and one-carbon intermediates | Quantify pathway flux in cells and tissues |
| Stable isotope tracing | Metabolic flux through folate cycle | Determine serine/formate utilization |
| CRISPR knockout screens | Gene essentiality under folate stress | Identify novel regulators |
| Ribo-seq | Ribosome occupancy and translation efficiency | Assess mitochondrial translation defects |
| Western blot | Protein expression and modification | Validate knockout or overexpression |
| Immunofluorescence | Subcellular localization | Confirm mitochondrial localization of enzymes |
| Enzyme activity assays | Catalytic activity of folate enzymes | Measure impact of mutations |
| Targeted sequencing | Mutations in folate genes | Clinical association studies |
Metabolomics and flux analysis
Mass spectrometry-based metabolomics can quantify folate species and one-carbon intermediates. Stable isotope tracing with 13C-serine or 13C-formate allows flux analysis through the folate cycle.
CRISPR screening and functional genomics
Genome-wide CRISPR knockout screens can identify genes required for proliferation under folate restriction or antifolate treatment. This approach has been used to uncover vulnerabilities in one-carbon metabolism.
Ribo-seq and mitochondrial translation assays
Ribo-seq measures ribosome occupancy and can reveal defects in mitochondrial translation upon disruption of folate-dependent tRNA methylation. Pulse-chase labeling of mitochondrial proteins provides complementary data.
Proteomics and post-translational modification analysis
Proteomic workflows can detect succinylation, phosphorylation, and other modifications on folate cycle enzymes. Such analyses link metabolic stress to pathway regulation.
How CRISPR Can Be Used to Study GO:0046653 tetrahydrofolate metabolic process
Knockout
CRISPR knockout of genes such as MTHFD2, SHMT2, or DHFR can abolish enzyme activity and reveal essentiality for proliferation and survival. Knockout cell lines are valuable for metabolic rescue experiments and drug sensitivity testing.
Point Mutation
Point mutations can model clinical variants, such as MTHFR C677T, or disrupt post-translational modification sites like succinylation on MTHFD2. These models help dissect catalytic versus regulatory functions.
Knock-in
Knock-in of tagged alleles (e.g., FLAG or GFP) allows visualization and immunoprecipitation of folate enzymes. Knock-in of resistance alleles can model chemotherapy resistance.
Overexpression
Overexpression of DHFR or TYMS can confer resistance to antifolates and drive proliferation. Such models are used to study gene dosage effects and drug resistance mechanisms.
How EDITGENE Supports tetrahydrofolate metabolic process Research
Researchers studying tetrahydrofolate metabolic process-related genes often need to determine whether a candidate gene is causally involved in pathway regulation, disease progression, or drug response. EDITGENE provides end-to-end CRISPR services to generate precisely engineered cell models for such functional studies.
Contact EDITGENE today to design your custom CRISPR model for tetrahydrofolate metabolic process research.
Frequently Asked Questions About tetrahydrofolate metabolic process
What is GO:0046653 tetrahydrofolate metabolic process?
GO:0046653 is a Gene Ontology biological process term defined as the chemical reactions and pathways involving tetrahydrofolate, a folate derivative that carries one-carbon units for nucleotide synthesis, methylation, and mitochondrial translation.
What genes are involved in tetrahydrofolate metabolic process?
Key genes include DHFR, MTHFR, MTHFD1, MTHFD2, MTHFD1L, SHMT1, SHMT2, MTR, TYMS, and SLC19A1, among others.
Why is tetrahydrofolate important for cancer?
Cancer cells often upregulate folate cycle enzymes to support rapid proliferation and survival, and mitochondrial tetrahydrofolate signaling can promote chemotherapy resistance.
How is tetrahydrofolate metabolism regulated?
It is regulated by nutrient status, enzyme expression, and post-translational modifications such as succinylation of mitochondrial enzymes.
What diseases are linked to tetrahydrofolate metabolic process?
Diseases include cancer, vascular disease, hyperhomocysteinemia, and mitochondrial translation defects.
What is the role of MTHFD2 in tetrahydrofolate metabolism?
MTHFD2 is a mitochondrial enzyme that interconverts folate species and supports de novo purine synthesis; its activity can be suppressed by succinylation.
How can CRISPR be used to study tetrahydrofolate metabolism?
CRISPR knockout, point mutation, knock-in, and overexpression models allow causal testing of gene function in the pathway.
What methods are used to study tetrahydrofolate metabolic process?
Common methods include LC-MS metabolomics, stable isotope tracing, CRISPR screens, Ribo-seq, and enzyme activity assays.
Is tetrahydrofolate metabolism involved in mitochondrial translation?
Yes, folate-dependent tRNA methylation is required for mitochondrial translation, linking the pathway to bioenergetics.
What is the difference between folic acid and L-5-methyltetrahydrofolate?
They differ in pharmacokinetics and metabolic conversion, which can affect clinical efficacy and safety.
Conclusion
Tetrahydrofolate metabolic process (GO:0046653) is a central hub of one-carbon metabolism that supports nucleotide synthesis, methylation, and mitochondrial translation. Its dysregulation is implicated in cancer, vascular disease, and mitochondrial dysfunction, making it a high-priority area for functional genomics. CRISPR-based models offer powerful tools to dissect the causal roles of individual genes in this pathway.
References
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- 2. Nengroo MA et al.. 2025. Accumulation of succinate suppresses de novo purine synthesis through succinylation-mediated control of the mitochondrial folate cycle.. Mol Cell 85(22):4215-4228.e9 PMID: 41161310
- 3. Pietrzik K et al.. 2010. Folic acid and L-5-methyltetrahydrofolate: comparison of clinical pharmacokinetics and pharmacodynamics.. Clin Pharmacokinet 49(8):535-48 PMID: 20608755
- 4. Morscher RJ et al.. 2018. Mitochondrial translation requires folate-dependent tRNA methylation.. Nature 554(7690):128-132 PMID: 29364879
- 5. Ayoub G. 2025. Vitamins, Vascular Health and Disease.. Nutrients 17(18) PMID: 41010482
- 6. He Y et al.. 2019. Metabolic Intermediates in Tumorigenesis and Progression.. Int J Biol Sci 15(6):1187-1199 PMID: 31223279
- 7. McFadden JW et al.. 2020. Symposium review: One-carbon metabolism and methyl donor nutrition in the dairy cow.. J Dairy Sci 103(6):5668-5683 PMID: 32278559
- 8. Hwang JS et al.. 2025. Non-canonical dihydrolipoyl transacetylase promotes chemotherapy resistance via mitochondrial tetrahydrofolate signaling.. Nat Commun 16(1):8932 PMID: 41062483
