GO:0046654 tetrahydrofolate biosynthetic process: One-Carbon Metabolism Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0046654 tetrahydrofolate biosynthetic process describes the chemical reactions and pathways that form tetrahydrofolate (THF), the fully reduced folate cofactor required for one-carbon transfer reactions.
• THF biosynthesis supplies methyl groups for methionine synthesis, thymidylate synthesis, purine synthesis, and mitochondrial tRNA methylation.
• Serine hydroxymethyltransferase (SHMT) is a central enzyme that feeds one-carbon units into the THF pool.
• Methionine synthase supports tumour tetrahydrofolate pools, linking THF biosynthesis to cancer metabolism.
• Disrupted THF biosynthesis impairs mitochondrial translation and has been implicated in chemotherapy resistance.
• CRISPR knockout, point-mutation, knock-in, and overexpression models enable causal testing of THF biosynthesis genes in disease and metabolism research.
Description
Tetrahydrofolate (THF) is the biologically active, fully reduced form of folate and serves as the central cofactor for one-carbon metabolism. The Gene Ontology term GO:0046654, tetrahydrofolate biosynthetic process, defines the chemical reactions and pathways resulting in the formation of tetrahydrofolate, 5,6,7,8-tetrahydrofolic acid, a folate derivative bearing additional hydrogens on the pterin group. This process is essential because THF donates and accepts one-carbon units in reactions that synthesize nucleotides, amino acids, and methyl donors. Research into GO:0046654 spans nutrition, cancer biology, mitochondrial biology, and neurodevelopment. Clinical pharmacokinetic studies distinguish folic acid from L-5-methyltetrahydrofolate, highlighting how different folate forms enter and sustain the THF pool. In mitochondria, folate-dependent tRNA methylation is required for efficient translation, connecting THF biosynthesis to organellar gene expression. In tumours, methionine synthase activity supports tetrahydrofolate pools, and non-canonical mitochondrial tetrahydrofolate signalling has been linked to chemotherapy resistance. Because THF biosynthesis intersects with so many metabolic routes, researchers need precise models to dissect gene function. This article summarizes the definition, mechanism, key genes, disease links, and experimental methods for studying GO:0046654, with a focus on CRISPR-based approaches for causal validation.
tetrahydrofolate biosynthetic process At A Glance
| GO ID | GO:0046654 |
|---|---|
| GO term | tetrahydrofolate biosynthetic process |
| Ontology | biological_process |
| Definition | The chemical reactions and pathways resulting in the formation of tetrahydrofolate, 5,6,7,8-tetrahydrofolic acid, a folate derivative bearing additional hydrogens on the pterin group. |
| Synonyms | tetrahydrofolate anabolism; tetrahydrofolate biosynthesis; tetrahydrofolate formation; tetrahydrofolate synthesis |
| Major function | Production of the reduced folate cofactor THF for one-carbon transfer reactions in nucleotide, amino acid, and methyl metabolism. |
| Related cofactor | Tetrahydrofolate (THF), the fully reduced folate derivative. |
| Key metabolic input | One-carbon units derived from serine and other donors via serine hydroxymethyltransferase. |
| Disease relevance | Cancer metabolism, chemotherapy resistance, and mitochondrial translation defects. |
What Is GO:0046654?
GO:0046654 tetrahydrofolate biosynthetic process is the biological process comprising the chemical reactions and pathways that produce tetrahydrofolate (THF), also known as 5,6,7,8-tetrahydrofolic acid. THF is a folate derivative that carries additional hydrogens on the pterin ring, making it the reduced cofactor form used in one-carbon transfer reactions. The term covers the enzymatic steps that convert folate intermediates into THF and the pathways that maintain the THF pool for downstream metabolism.
Why Is tetrahydrofolate biosynthetic process Important in Cell Biology?
GO:0046654 is important because tetrahydrofolate is the reduced folate cofactor that powers one-carbon metabolism, a hub for nucleotide biosynthesis, amino acid interconversion, and methylation reactions. Without adequate THF biosynthesis, cells cannot efficiently synthesize DNA precursors or maintain methionine cycles, and mitochondrial translation can be impaired due to defective folate-dependent tRNA methylation. In cancer, tumour tetrahydrofolate pools are supported by methionine synthase, and mitochondrial tetrahydrofolate signalling has been associated with chemotherapy resistance. These connections make THF biosynthesis a focal point for metabolic research, nutritional science, and therapeutic development.
• Supplies THF for de novo purine and thymidylate synthesis, which are required for DNA replication.
• Feeds the methionine cycle through methyl transfer reactions.
• Supports mitochondrial translation via folate-dependent tRNA methylation.
• Is a determinant of tumour metabolic fitness and chemotherapy response.
• Links nutrition (folate forms) to clinical pharmacokinetics and vascular health.
• Provides metabolic intermediates relevant to tumorigenesis and progression.
• Is a target for understanding chemotherapy resistance mechanisms.
• Enables study of one-carbon flux in normal and diseased tissues.
• Connects to serine metabolism through serine hydroxymethyltransferase.
• Offers opportunities for CRISPR-based causal gene validation in metabolic pathways.
What Happens During tetrahydrofolate biosynthetic process?
Folate reduction to tetrahydrofolate
In simple terms: Folate must be chemically reduced to become the active THF cofactor.
The biosynthetic process converts folate derivatives into tetrahydrofolate, the fully reduced form bearing additional hydrogens on the pterin group. This reduction is a prerequisite for THF to participate in one-carbon transfer reactions. Clinical pharmacokinetic comparisons of folic acid and L-5-methyltetrahydrofolate illustrate how different folate forms are processed and contribute to the THF pool.
One-carbon unit acquisition via serine hydroxymethyltransferase
In simple terms: Enzymes pull one-carbon units from serine to charge the THF pool.
Serine hydroxymethyltransferase (SHMT) catalyzes the transfer of a one-carbon unit from serine to THF, generating 5,10-methylene-THF and glycine. This reaction is a major entry point for one-carbon units into folate metabolism and directly supports the tetrahydrofolate biosynthetic process by maintaining the pool of reduced folate cofactors.
Methionine synthase and THF pool maintenance
In simple terms: Methionine synthase helps keep THF available by recycling methyl groups.
Methionine synthase supports tumour tetrahydrofolate pools, indicating that the enzyme contributes to maintaining THF availability in cancer cells. This function links the tetrahydrofolate biosynthetic process to methionine metabolism and methylation reactions, which are critical for tumour growth and survival.
Mitochondrial folate-dependent tRNA methylation
In simple terms: Mitochondria need folate-derived methyl groups to modify tRNA for translation.
Mitochondrial translation requires folate-dependent tRNA methylation, connecting THF biosynthesis to organellar protein synthesis. When folate metabolism is disrupted, mitochondrial translation can be impaired, demonstrating that THF biosynthesis supports both cytosolic and mitochondrial one-carbon needs.
10-formyldihydrofolate metabolism
In simple terms: Intermediate folate forms are processed to regenerate usable THF.
Metabolism of 10-formyldihydrofolate in humans contributes to folate interconversion and THF regeneration. This step highlights the dynamic nature of the tetrahydrofolate biosynthetic process, in which oxidized or formylated intermediates are recycled back into the reduced THF pool.
Key Genes Involved in GO:0046654 tetrahydrofolate biosynthetic process
The following genes and proteins are experimentally linked to tetrahydrofolate biosynthesis, one-carbon metabolism, and related pathways.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SHMT1 | Serine hydroxymethyltransferase; transfers one-carbon units to THF | Central to cytosolic one-carbon metabolism and THF pool maintenance |
| SHMT2 | Mitochondrial serine hydroxymethyltransferase; supports mitochondrial one-carbon metabolism | Links THF biosynthesis to mitochondrial translation and cancer metabolism |
| MTR | Methionine synthase; supports tumour tetrahydrofolate pools | Target for studying THF pool maintenance in cancer |
| MTHFR | Methylenetetrahydrofolate reductase; contributes to folate interconversion | Relevant to folate pharmacokinetics and one-carbon flux |
| MTHFD1 | Methylenetetrahydrofolate dehydrogenase; involved in folate interconversion | Associated with 10-formyldihydrofolate metabolism |
| MTHFD2 | Mitochondrial folate cycle enzyme; supports one-carbon metabolism | Linked to mitochondrial translation and tumour metabolism |
| GART | Purine synthesis enzyme using THF cofactors | Downstream readout of THF availability |
| TYMS | Thymidylate synthase; uses THF-derived methylene groups | Marker of THF-dependent nucleotide synthesis |
| DHFR | Dihydrofolate reductase; regenerates THF | Key enzyme in folate reduction and THF recycling |
| FPGS | Folylpolyglutamate synthase; retains folates in cells | Affects intracellular THF pool size |
| SLC19A1 | Folate transporter; imports folate into cells | Determines substrate availability for THF biosynthesis |
| GCSH | Glycine cleavage system H protein; linked to one-carbon metabolism | Relevant to metabolic intermediates in tumorigenesis |
| DLAT | Dihydrolipoyl transacetylase; non-canonical role in mitochondrial THF signalling | Associated with chemotherapy resistance |
| MTRR | Methionine synthase reductase; supports methionine synthase activity | Indirectly supports THF pool maintenance |
| ATIC | Bifunctional purine synthesis enzyme using THF | Downstream THF-dependent purine synthesis |
| MTHFS | Methenyltetrahydrofolate synthetase; folate interconversion | Linked to 10-formyldihydrofolate metabolism |
| SLC46A1 | Proton-coupled folate transporter | Folate uptake affecting THF biosynthesis substrate supply |
| FOLR1 | Folate receptor alpha; mediates folate transport | Relevant to folate delivery and THF pool |
How Is tetrahydrofolate biosynthetic process Regulated?
The tetrahydrofolate biosynthetic process is regulated by substrate availability, enzyme expression, and metabolic demand. Serine hydroxymethyltransferase activity determines the flux of one-carbon units into THF. Methionine synthase supports tumour tetrahydrofolate pools, indicating that methionine cycle activity can influence THF availability. Mitochondrial folate-dependent tRNA methylation requires adequate THF, linking mitochondrial translation demand to folate metabolism. Additionally, non-canonical mitochondrial tetrahydrofolate signalling has been implicated in chemotherapy resistance, suggesting that stress conditions can alter THF-related pathways.
tetrahydrofolate biosynthetic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| MTR | Cancer; tumour tetrahydrofolate pool maintenance | Knockout or knockdown in cancer cell lines followed by metabolomics |
| DLAT | Chemotherapy resistance via mitochondrial THF signalling | Point-mutation or overexpression models in resistant cancer cells |
| SHMT2 | Mitochondrial translation and cancer metabolism | Knockout in mitochondrial translation reporter cells |
| MTHFD1 | 10-formyldihydrofolate metabolism | Knock-in of metabolic variants for flux analysis |
| MTHFR | Folate pharmacokinetics and one-carbon flux | Overexpression or point-mutation models in metabolic cell lines |
Cancer metabolism and chemotherapy resistance
Tetrahydrofolate biosynthesis supports nucleotide synthesis and methylation reactions required for tumour growth. Methionine synthase supports tumour tetrahydrofolate pools, and non-canonical mitochondrial tetrahydrofolate signalling has been linked to chemotherapy resistance. These findings position THF biosynthesis as a potential target for understanding and overcoming treatment resistance.
Mitochondrial translation defects
Mitochondrial translation requires folate-dependent tRNA methylation, so impaired THF biosynthesis can compromise mitochondrial protein synthesis. This connection links GO:0046654 to mitochondrial dysfunction and metabolic stress.
Nutritional and vascular health
Folate forms differ in clinical pharmacokinetics and pharmacodynamics, affecting the availability of substrates for THF biosynthesis. Vitamins, including folate, are relevant to vascular health and disease, highlighting the broader physiological importance of one-carbon metabolism.
Metabolic intermediates in tumorigenesis
Metabolic intermediates, including those in folate metabolism, contribute to tumorigenesis and progression. Understanding how THF biosynthesis intersects with these intermediates may reveal new research directions.
From tetrahydrofolate biosynthetic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is a candidate gene required for THF biosynthesis? | CRISPR knockout cell line followed by metabolomics |
| Does a specific variant alter enzyme function? | CRISPR point-mutation knock-in cell line |
| Can a tagged protein track THF pathway localization? | Tagged knock-in with fluorescent or affinity tag |
| Does overexpression change THF pool size? | CRISPR overexpression cell model |
| Which genes regulate chemotherapy resistance? | CRISPR library screening in resistant cancer cells |
| How does mitochondrial translation respond to THF loss? | Knockout plus mitochondrial translation assays |
How to Study the tetrahydrofolate biosynthetic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Metabolomics | Levels of THF and folate intermediates | Assessing pathway activity after gene perturbation |
| Stable isotope tracing | One-carbon flux through THF pool | Quantifying metabolic rewiring in cancer cells |
| CRISPR knockout | Gene requirement for THF biosynthesis | Causal validation of candidate genes |
| CRISPR point-mutation knock-in | Effect of specific variants on enzyme function | Modeling disease-associated or resistance variants |
| Mitochondrial translation assay | Folate-dependent mitochondrial protein synthesis | Testing mitochondrial consequences of THF loss |
| RNA-seq | Transcriptional changes in one-carbon metabolism | Mapping regulatory responses to THF perturbation |
| Proteomics | Protein expression of folate pathway enzymes | Identifying compensatory changes |
| CRISPR library screening | Genes that modify chemotherapy resistance | Discovering novel THF-related resistance drivers |
Metabolomics and one-carbon flux analysis
Metabolomics can quantify tetrahydrofolate and related folate intermediates to assess the activity of GO:0046654. Stable isotope tracing with serine or formate can measure one-carbon flux through the THF pool.
CRISPR knockout and point-mutation models
CRISPR knockout of SHMT1, SHMT2, MTR, or MTHFD1 can test whether these genes are required for THF biosynthesis and downstream metabolism. Point-mutation knock-in can model specific enzyme variants and their effects on folate interconversion.
Mitochondrial translation assays
Because mitochondrial translation requires folate-dependent tRNA methylation, assays of mitochondrial protein synthesis can reveal functional consequences of disrupted THF biosynthesis. These assays are typically combined with knockout or knockdown of folate pathway genes.
Transcriptomics and proteomics
RNA-seq and proteomics can identify expression changes in one-carbon metabolism genes after perturbation of THF biosynthesis. Such datasets help map the broader regulatory network around GO:0046654.
How CRISPR Can Be Used to Study GO:0046654 tetrahydrofolate biosynthetic process
Knockout
CRISPR knockout of genes such as SHMT1, SHMT2, MTR, or MTHFD1 can determine whether they are required for tetrahydrofolate biosynthesis and downstream one-carbon metabolism. Knockout models are useful for measuring changes in THF pool size and mitochondrial translation.
Point Mutation
Point-mutation knock-in can model specific amino acid changes in folate enzymes to test their impact on catalytic activity and pathway flux. This approach is valuable for studying variants associated with chemotherapy resistance or altered folate metabolism.
Knock-in
Tagged knock-in of endogenous folate pathway genes enables tracking of protein localization and interactions without overexpression artifacts. Knock-in reporters can also be used to monitor pathway activity in live cells.
Overexpression
CRISPR overexpression of genes such as MTR or SHMT2 can test whether increased enzyme levels expand the THF pool or alter tumour metabolism. Overexpression models help establish sufficiency in metabolic pathways.
How EDITGENE Supports tetrahydrofolate biosynthetic process Research
Researchers studying tetrahydrofolate biosynthetic process-related genes often need to determine whether a candidate gene is causally involved in THF pool maintenance, one-carbon flux, or disease phenotypes. EDITGENE provides CRISPR-based cell model services to enable such causal experiments.
Contact EDITGENE today to design your custom CRISPR model for tetrahydrofolate biosynthetic process research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| DHFR2 Knockout HEK293 Cell Line | EDJ-KQ4628 | Human | 200895 | Details Get a Quote |
| GCH1 Knockout HEK293 Cell Line | EDC07929 | Human | 2643 | Details Get a Quote |
| SLC46A1 Knockout HEK293 Cell Line | EDJ-KQ7415 | Human | 113235 | Details Get a Quote |
| FOLR1 Knockout HEK293 Cell Line | EDJ-KQ17719 | Human | 2348 | Details Get a Quote |
| FOLR1 Knockout HeLa Cell Line | EDJ-KQ18300 | Human | 2348 | Details Get a Quote |
| FOLR1 Knockout HCT 116 Cell Line | EDC10324 | Human | 2348 | Details Get a Quote |
| DHFR2 Knockout A-549 Cell Line | EDJ-KQ27308 | Human | 200895 | Details Get a Quote |
| DHFR2 Knockout HCT 116 Cell Line | EDJ-KQ27309 | Human | 200895 | Details Get a Quote |
| DHFR2 Knockout HeLa Cell Line | EDJ-KQ27310 | Human | 200895 | Details Get a Quote |
| GCH1 Knockout A-549 Cell Line | EDJ-KQ27406 | Human | 2643 | Details Get a Quote |
| GCH1 Knockout HCT 116 Cell Line | EDJ-KQ27407 | Human | 2643 | Details Get a Quote |
| GCH1 Knockout HeLa Cell Line | EDJ-KQ27408 | Human | 2643 | Details Get a Quote |
| SLC46A1 Knockout A-549 Cell Line | EDJ-KQ31225 | Human | 113235 | Details Get a Quote |
| SLC46A1 Knockout HCT 116 Cell Line | EDJ-KQ32595 | Human | 113235 | Details Get a Quote |
| SLC46A1 Knockout HeLa Cell Line | EDJ-KQ32596 | Human | 113235 | Details Get a Quote |
Frequently Asked Questions About tetrahydrofolate biosynthetic process
What is GO:0046654 tetrahydrofolate biosynthetic process?
GO:0046654 is the biological process describing the chemical reactions and pathways that form tetrahydrofolate, the fully reduced folate cofactor used in one-carbon transfer reactions.
What genes are involved in tetrahydrofolate biosynthetic process?
Genes such as SHMT1, SHMT2, MTR, MTHFD1, MTHFR, DHFR, and FPGS are involved in folate metabolism and THF pool maintenance.
Why is tetrahydrofolate important for cells?
Tetrahydrofolate supplies one-carbon units for nucleotide synthesis, amino acid metabolism, and methylation reactions, and supports mitochondrial translation.
How is tetrahydrofolate biosynthesis linked to cancer?
Methionine synthase supports tumour tetrahydrofolate pools, and mitochondrial tetrahydrofolate signalling has been linked to chemotherapy resistance.
What is the role of serine hydroxymethyltransferase in THF biosynthesis?
Serine hydroxymethyltransferase transfers one-carbon units from serine to THF, generating 5,10-methylene-THF and glycine.
Does folate metabolism affect mitochondrial translation?
Yes, mitochondrial translation requires folate-dependent tRNA methylation, so THF biosynthesis is needed for efficient mitochondrial protein synthesis.
What experimental models are used to study GO:0046654?
CRISPR knockout, point-mutation knock-in, tagged knock-in, overexpression, metabolomics, and mitochondrial translation assays are commonly used.
How can CRISPR help study tetrahydrofolate biosynthetic process?
CRISPR knockout and knock-in can causally test whether specific genes are required for THF biosynthesis and downstream phenotypes.
What diseases are associated with tetrahydrofolate biosynthesis?
Cancer metabolism, chemotherapy resistance, mitochondrial translation defects, and nutritional or vascular conditions have been linked to folate metabolism.
What is 10-formyldihydrofolate metabolism?
10-formyldihydrofolate metabolism is a folate interconversion pathway that contributes to THF regeneration in humans.
Conclusion
GO:0046654 tetrahydrofolate biosynthetic process defines the formation of tetrahydrofolate, the reduced folate cofactor essential for one-carbon metabolism, nucleotide synthesis, methylation, and mitochondrial translation. Its connections to cancer metabolism, chemotherapy resistance, and nutritional health make it a high-value research area. CRISPR-based knockout, point-mutation, knock-in, and overexpression models provide powerful tools to dissect the causal roles of folate pathway genes. EDITGENE supports these efforts with comprehensive cell model and screening services.
References
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- 2. Morscher RJ et al.. 2018. Mitochondrial translation requires folate-dependent tRNA methylation.. Nature 554(7690):128-132 PMID: 29364879
- 3. Ayoub G. 2025. Vitamins, Vascular Health and Disease.. Nutrients 17(18) PMID: 41010482
- 4. He Y et al.. 2019. Metabolic Intermediates in Tumorigenesis and Progression.. Int J Biol Sci 15(6):1187-1199 PMID: 31223279
- 5. Hwang JS et al.. 2025. Non-canonical dihydrolipoyl transacetylase promotes chemotherapy resistance via mitochondrial tetrahydrofolate signaling.. Nat Commun 16(1):8932 PMID: 41062483
- 6. Schirch L. 1982. Serine hydroxymethyltransferase.. Adv Enzymol Relat Areas Mol Biol 53:83-112 PMID: 7036682
- 7. Baggott JE et al.. 2001. Metabolism of 10-formyldihydrofolate in humans.. Biomed Pharmacother 55(8):454-7 PMID: 11686579
- 8. Ghergurovich JM et al.. 2021. Methionine synthase supports tumour tetrahydrofolate pools.. Nat Metab 3(11):1512-1520 PMID: 34799699
