GO:0019249 lactate biosynthetic process: Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0019249 lactate biosynthetic process describes the biochemical reactions that produce lactate, the anion of lactic acid, from pyruvate or other precursors.
• Lactate is no longer viewed as a waste product; it is a major energy substrate, signaling molecule, and precursor for lactylation.
• Key enzymes include LDHA, LDHB, and the pyruvate dehydrogenase complex components that supply pyruvate for lactate formation.
• Lactate production is elevated in many cancers and supports tumor growth, immune evasion, and stemness.
• Lactylation, a lactate-derived post-translational modification, links lactate biosynthesis to epigenetic regulation and gene expression.
• CRISPR knockout, knock-in, and overexpression models are essential to dissect the causal roles of lactate biosynthetic genes in disease.
Description
Lactate biosynthetic process (GO:0019249) is defined as the chemical reactions and pathways resulting in the formation of lactate, the anion of lactic acid. Historically considered a metabolic waste product of anaerobic glycolysis, lactate is now recognized as a central metabolite that fuels oxidative metabolism, participates in cell signaling, and serves as a substrate for protein lactylation. The process is tightly linked to pyruvate metabolism, where lactate dehydrogenase (LDH) enzymes catalyze the interconversion of pyruvate and lactate. In cancer, lactate production supports tumor growth, angiogenesis, and immune escape, making it a target of intense research. In normal physiology, lactate biosynthesis is crucial for skin homeostasis, wound healing, and immune modulation. Understanding the molecular players and regulatory mechanisms of lactate biosynthesis is therefore essential for researchers in metabolism, immunology, and oncology.
lactate biosynthetic process At A Glance
| GO ID | GO:0019249 |
|---|---|
| GO term | lactate biosynthetic process |
| Ontology | biological_process |
| Synonym | lactate anabolism, lactate biosynthesis, lactate formation, lactate synthesis |
| Major function | Production of lactate from pyruvate and other precursors |
| Key enzymes | LDHA, LDHB, PDHA1, PDHB, PKM |
| Cellular location | Cytoplasm, mitochondria |
| Related pathways | Glycolysis, gluconeogenesis, pyruvate metabolism |
What Is GO:0019249?
The lactate biosynthetic process (GO:0019249) encompasses the enzymatic steps that lead to the production of lactate from its metabolic precursors, primarily pyruvate. This process is reversible and depends on the redox state of the cell, with lactate dehydrogenase (LDH) catalyzing the reduction of pyruvate to lactate using NADH as a cofactor. The term also includes pathways that generate lactate from other sources, such as alanine or glycolytic intermediates, under specific physiological conditions.
Why Is lactate biosynthetic process Important in Cell Biology?
Lactate biosynthetic process is critical because lactate is not merely a metabolic byproduct but a key oncometabolite and signaling molecule. It fuels the tricarboxylic acid (TCA) cycle in oxidative cancer cells, promotes angiogenesis, and suppresses immune surveillance. Moreover, lactate serves as a substrate for lactylation, a newly discovered post-translational modification that regulates gene expression and cancer stemness. In non-cancer contexts, lactate production is essential for skin barrier function, wound healing, and immune cell polarization. Thus, understanding how lactate is synthesized and regulated offers therapeutic opportunities across oncology, immunology, and dermatology.
• Lactate is a major energy substrate for oxidative tumors and supports tumor growth.
• Lactate promotes immune evasion by suppressing T cell and NK cell function.
• Lactylation of histones and other proteins links lactate metabolism to epigenetic regulation.
• Lactate biosynthesis is essential for skin homeostasis and barrier repair.
• Dysregulated lactate production is observed in inflammatory diseases and fibrosis.
• Lactate serves as a signaling molecule via GPR81 and other receptors.
• Targeting lactate biosynthesis enzymes (e.g., LDHA) is a promising anticancer strategy.
• Lactate levels are prognostic biomarkers in multiple cancers.
• Lactate biosynthesis intersects with glutamine metabolism and redox balance.
• CRISPR screens have identified lactate pathway genes as vulnerabilities in cancer.
What Happens During lactate biosynthetic process?
Glycolytic flux and pyruvate generation
In simple terms: Cells break down glucose to make pyruvate, the raw material for lactate.
The lactate biosynthetic process begins with glycolysis, where glucose is converted to pyruvate through a series of enzymatic steps. Key enzymes include hexokinase, phosphofructokinase, and pyruvate kinase (PKM). In cancer cells, the Warburg effect leads to high glycolytic rates and abundant pyruvate, which is then available for lactate production. Pyruvate can also be generated from other sources such as alanine via transamination.
LDH-catalyzed reduction of pyruvate to lactate
In simple terms: The enzyme LDH converts pyruvate into lactate using NADH.
Lactate dehydrogenase (LDH) catalyzes the reversible conversion of pyruvate to lactate, coupled with the oxidation of NADH to NAD+. The human genome encodes LDHA and LDHB subunits, which form homo- or heterotetramers. LDHA preferentially converts pyruvate to lactate, while LDHB favors the reverse reaction. This step is crucial for regenerating NAD+ to sustain glycolysis. In hypoxic conditions, LDHA is upregulated via HIF-1α to maintain glycolytic flux.
Mitochondrial pyruvate metabolism and redox balance
In simple terms: Mitochondria also influence lactate production by consuming or producing pyruvate.
Pyruvate can enter mitochondria and be converted to acetyl-CoA by the pyruvate dehydrogenase complex (PDH), or to oxaloacetate by pyruvate carboxylase. The mitochondrial redox state (NADH/NAD+ ratio) affects the equilibrium of the LDH reaction. In oxidative cancer cells, lactate produced by hypoxic cells can be taken up and oxidized in mitochondria, a phenomenon known as the reverse Warburg effect. Thus, mitochondrial activity indirectly regulates lactate biosynthesis.
Lactate export and shuttling
In simple terms: Lactate is transported out of cells to be used elsewhere.
Once synthesized, lactate is exported from cells via monocarboxylate transporters (MCTs), particularly MCT4 (SLC16A3) in glycolytic cells. Extracellular lactate can be taken up by oxidative cells via MCT1 (SLC16A1) and used for energy or signaling. This lactate shuttle is essential for tumor-stroma metabolic symbiosis and immune cell function. Intracellular lactate can also be used for lactylation of proteins, linking metabolism to gene regulation.
Regulation by oncogenes and tumor suppressors
In simple terms: Genes like MYC and HIF-1 control how much lactate is made.
Lactate biosynthesis is regulated by oncogenic signaling pathways. MYC upregulates LDHA and other glycolytic genes, while HIF-1α induces LDHA under hypoxia. Conversely, tumor suppressors like p53 can inhibit glycolysis and lactate production. The PI3K/AKT/mTOR pathway also promotes glycolytic flux and lactate generation. These regulatory layers make lactate biosynthesis a dynamic and context-dependent process.
Key Genes Involved in GO:0019249 lactate biosynthetic process
The following genes and proteins are central to the lactate biosynthetic process, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| LDHA | Catalyzes pyruvate to lactate conversion | Target for cancer therapy; biomarker of glycolysis |
| LDHB | Catalyzes lactate to pyruvate conversion | Oxidative metabolism; tumor suppressor in some contexts |
| PKM | Converts phosphoenolpyruvate to pyruvate | Regulates glycolytic flux and lactate production |
| PDHA1 | Pyruvate dehydrogenase E1 subunit | Links pyruvate to TCA cycle; mutations cause PDH deficiency |
| PDHB | Pyruvate dehydrogenase E1 beta subunit | Mitochondrial pyruvate oxidation |
| HIF1A | Hypoxia-inducible factor 1 alpha | Upregulates LDHA and glycolytic genes under hypoxia |
| MYC | Oncogenic transcription factor | Promotes glycolysis and lactate production |
| SLC16A1 | Monocarboxylate transporter 1 (MCT1) | Lactate uptake in oxidative cells |
| SLC16A3 | Monocarboxylate transporter 4 (MCT4) | Lactate export from glycolytic cells |
| GPR81 | Lactate receptor | Mediates lactate signaling in immune and cancer cells |
| EPAS1 | HIF-2 alpha | Regulates hypoxia response and lactate metabolism |
| PDK1 | Pyruvate dehydrogenase kinase 1 | Inhibits PDH, shunting pyruvate to lactate |
| LDHC | Lactate dehydrogenase C | Testis-specific; potential cancer-testis antigen |
| G6PD | Glucose-6-phosphate dehydrogenase | Pentose phosphate pathway; indirect role in NADPH/NADH balance |
| ALDOA | Aldolase A | Glycolytic enzyme; promotes lactate production in cancer |
| ENO1 | Enolase 1 | Glycolytic enzyme; multifunctional roles in cancer |
| GAPDH | Glyceraldehyde-3-phosphate dehydrogenase | Glycolytic enzyme; also involved in lactylation |
How Is lactate biosynthetic process Regulated?
Lactate biosynthetic process is regulated at multiple levels. Transcriptional regulation by HIF-1α and MYC increases LDHA expression under hypoxia or oncogenic stress. Post-translational modifications, such as phosphorylation and acetylation, modulate LDH activity. The PI3K/AKT/mTOR pathway enhances glycolysis and lactate production, while AMPK can inhibit it under energy stress. Additionally, lactate itself can feedback to regulate gene expression via lactylation of histones and transcription factors. Extracellular pH and lactate levels also influence the equilibrium of the LDH reaction.
lactate biosynthetic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| LDHA | Cancer (multiple types), poor prognosis | LDHA knockout cancer cell lines; xenograft models |
| LDHB | Cancer, oxidative metabolism | LDHB overexpression or knockout in cancer cells |
| PDHA1 | Pyruvate dehydrogenase deficiency, neurodegeneration | Patient-derived fibroblasts; PDHA1 knock-in mice |
| HIF1A | Cancer, hypoxia response | HIF1A knockout or knockdown under hypoxia |
| SLC16A3 | Cancer, lactate export | MCT4 knockout cancer cells; metastasis models |
Lactate biosynthesis in cancer
In cancer, elevated lactate biosynthesis supports tumor growth, metastasis, and immune evasion. High LDHA expression correlates with poor prognosis in many cancers, including lung, breast, and pancreatic cancer. Lactate produced by tumor cells acidifies the microenvironment, impairing T cell function and promoting regulatory T cell expansion. Lactate also serves as a substrate for lactylation, which drives cancer stemness and epigenetic reprogramming. Targeting lactate biosynthesis enzymes or transporters is an active therapeutic strategy.
Lactate biosynthesis in skin homeostasis and inflammation
Lactate is essential for skin barrier function and wound healing. Keratinocytes produce lactate via glycolysis, which regulates differentiation and immune responses. Dysregulated lactate metabolism is implicated in psoriasis and atopic dermatitis. Lactate also modulates immune cell function in the skin, influencing inflammation and repair.
Lactate biosynthesis in immune modulation
Lactate acts as an immunomodulatory molecule. It suppresses cytotoxic T cell and NK cell activity, promotes macrophage polarization toward an M2-like phenotype, and enhances myeloid-derived suppressor cell function. These effects are mediated partly through GPR81 signaling and lactylation of immune-related proteins. Understanding lactate biosynthesis in immune cells is crucial for cancer immunotherapy.
Lactate biosynthesis in metabolic disorders
Altered lactate metabolism is observed in diabetes, obesity, and mitochondrial diseases. In diabetes, elevated lactate levels are associated with insulin resistance and impaired glucose utilization. Mitochondrial dysfunction can shift metabolism toward lactate production, as seen in PDH deficiency and Leigh syndrome. Lactate is also a biomarker of sepsis and ischemia.
From lactate biosynthetic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does LDHA loss reduce tumor growth? | LDHA knockout cancer cell lines and xenografts |
| Does a point mutation in LDHA affect enzyme activity? | LDHA point-mutation knock-in cell lines |
| Does lactate production regulate immune evasion? | LDHA knockout co-culture with T cells |
| Does LDHA overexpression promote metastasis? | LDHA overexpression in cancer cells; in vivo metastasis models |
| Does lactylation of histones require LDHA? | LDHA knockout with lactylation-specific antibodies |
| Does MCT4 inhibition alter lactate flux? | SLC16A3 knockout or pharmacological inhibition |
How to Study the lactate biosynthetic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| 13C metabolic flux analysis | Carbon flow through glycolysis and TCA cycle | Quantifying lactate production from labeled substrates |
| Lactate colorimetric assay | Lactate concentration in media or serum | Screening for changes in lactate secretion |
| CRISPR knockout screen | Gene essentiality for lactate production or growth | Identifying novel regulators of lactate metabolism |
| RNA-seq | Transcriptional changes in glycolytic genes | Assessing LDHA, PKM, and HIF1A expression |
| Western blot | Protein levels of LDHA, LDHB, lactylation | Validating knockout or overexpression |
| Immunohistochemistry | LDHA expression in tumor tissues | Correlating with prognosis |
| Seahorse extracellular flux assay | Glycolysis and oxidative phosphorylation rates | Measuring real-time lactate production |
| Mass spectrometry | Lactylation sites on proteins | Mapping lactylome changes |
Metabolic flux analysis
Metabolic flux analysis using 13C-labeled glucose or glutamine allows quantification of lactate production and consumption in real time. This method can trace carbon flow through glycolysis and the TCA cycle, revealing how genetic perturbations affect lactate biosynthesis.
Lactate quantification assays
Enzymatic assays and colorimetric kits measure lactate levels in cell culture media, serum, or tissues. These are simple and widely used to assess changes in lactate production after gene knockout or overexpression.
CRISPR screens for lactate pathway genes
Genome-wide CRISPR knockout or activation screens can identify genes that regulate lactate production or sensitivity to lactate. Such screens have uncovered novel regulators of glycolysis and lactate metabolism in cancer cells.
Lactylation detection
Western blotting with pan-lactylation antibodies or mass spectrometry-based proteomics can detect lactylation of histones and other proteins. This links lactate biosynthesis to epigenetic regulation and signaling.
How CRISPR Can Be Used to Study GO:0019249 lactate biosynthetic process
Knockout
CRISPR knockout of LDHA or other lactate biosynthetic genes is used to abolish lactate production and assess downstream effects on cell proliferation, metabolism, and immune interactions. Knockout cell lines are valuable for validating drug targets and understanding metabolic rewiring.
Point Mutation
Point mutations in LDHA or PDHA1 can mimic human disease variants or alter catalytic activity. CRISPR-mediated point mutation knock-in allows precise modeling of enzyme deficiencies and structure-function studies.
Knock-in
Knock-in of tagged LDHA (e.g., FLAG or GFP) enables tracking of protein localization and interactions. Knock-in of reporter genes under the LDHA promoter can monitor lactate production dynamics in live cells.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression of LDHA or HIF1A is used to study the effects of increased lactate biosynthesis on tumor growth, metastasis, and immune evasion.
How EDITGENE Supports lactate biosynthetic process Research
Researchers studying lactate biosynthetic process-related genes often need to determine whether a candidate gene is causally involved in lactate production, tumor growth, or immune modulation. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell models, enabling rigorous functional studies.
Contact EDITGENE today to design your custom CRISPR model for lactate biosynthetic process research.
Frequently Asked Questions About lactate biosynthetic process
What is lactate biosynthetic process?
Lactate biosynthetic process (GO:0019249) is the set of biochemical reactions that produce lactate from pyruvate or other precursors, primarily catalyzed by lactate dehydrogenase (LDH).
What genes are involved in lactate biosynthetic process?
Key genes include LDHA, LDHB, PKM, PDHA1, PDHB, HIF1A, MYC, and monocarboxylate transporters SLC16A1 and SLC16A3.
Why is lactate production important in cancer?
Lactate supports tumor growth, angiogenesis, immune evasion, and serves as a substrate for lactylation, which drives cancer stemness.
How is lactate biosynthetic process regulated?
It is regulated by HIF-1α, MYC, PI3K/AKT/mTOR signaling, and feedback via lactylation and redox state.
What is lactylation?
Lactylation is a post-translational modification where lactate-derived lactyl groups are added to lysine residues on histones and other proteins, influencing gene expression.
Which enzymes catalyze lactate production?
Lactate dehydrogenase A (LDHA) primarily converts pyruvate to lactate, while LDHB favors the reverse reaction.
Can lactate be used as an energy source?
Yes, lactate can be taken up by oxidative cells via MCT1 and converted back to pyruvate for mitochondrial oxidation.
What diseases are linked to lactate biosynthesis?
Cancer, inflammatory skin diseases, diabetes, and mitochondrial disorders are associated with altered lactate production.
How can I study lactate biosynthesis in the lab?
Common methods include lactate assays, 13C flux analysis, CRISPR knockout screens, and lactylation detection by western blot or mass spectrometry.
What CRISPR models are available for lactate research?
EDITGENE provides knockout, point mutation, knock-in, overexpression, and library screening services for lactate pathway genes.
Conclusion
Lactate biosynthetic process (GO:0019249) is a fundamental metabolic pathway with far-reaching implications in cancer, immunology, and normal physiology. The conversion of pyruvate to lactate by LDH enzymes not only sustains glycolysis but also generates a signaling molecule that regulates gene expression through lactylation. Understanding the genes, regulation, and disease relevance of this process is essential for developing targeted therapies. EDITGENE's CRISPR services empower researchers to dissect these mechanisms with precision and speed.
References
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- 8. Nguyen NTB et al.. 2025. Lactate controls cancer stemness and plasticity through epigenetic regulation.. Cell Metab 37(4):903-919.e10 PMID: 39933514
