GO:1902688 regulation of NAD metabolic process: Metabolic Homeostasis Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1902688 (regulation of NAD metabolic process) is a biological_process term defined as any process that modulates the frequency, rate or extent of NAD metabolic process.
• NAD+ is a central redox cofactor and signalling substrate whose levels are controlled by biosynthesis, salvage, consumption and redox cycling.
• Key regulators include NAMPT, NMNAT1-3, NADSYN1, QPRT, PARP1, CD38, SIRT1-7 and NADK, which together set cellular NAD(H) and NADP(H) pools.
• Dysregulated NAD metabolism is implicated in cancer immune evasion, inflammation, metabolic reprogramming and age-related decline.
• NADH reductive stress and NAD+ depletion are emerging mechanistic drivers of metabolic and inflammatory disease.
• CRISPR knockout, point-mutation, knock-in and overexpression models enable causal dissection of NAD regulatory genes in disease contexts.
Description
GO:1902688, regulation of NAD metabolic process, is a Gene Ontology biological_process term that describes any process which modulates the frequency, rate or extent of NAD metabolic process. NAD (nicotinamide adenine dinucleotide) is an essential redox cofactor and a substrate for signalling enzymes, so its concentration and redox state must be tightly controlled for cellular energy metabolism and gene regulation. Because NAD+ is consumed by PARPs, sirtuins and CD38, and replenished through salvage and de novo pathways, the regulation of its metabolism sits at the intersection of metabolism, transcription and genome stability. For researchers, GO:1902688 provides a formal framework to annotate genes and pathways that set NAD(H) and NADP(H) pools. Perturbations in these regulators are linked to cancer, inflammation, neurodegeneration and metabolic disease, making the term a practical entry point for functional genomics. Understanding which enzymes and feedback loops control NAD flux helps interpret phenotypes from CRISPR screens and metabolomic studies. This article summarizes the authoritative QuickGO definition, the core biochemical steps, the major genes and proteins involved, disease relevance, and the experimental models and methods used to study regulation of NAD metabolic process.
regulation of NAD metabolic process At A Glance
| GO ID | GO:1902688 |
|---|---|
| GO term | regulation of NAD metabolic process |
| Ontology | biological_process |
| Definition | Any process that modulates the frequency, rate or extent of NAD metabolic process. |
| Synonyms | regulation of NAD metabolism; regulation of NAD (oxidized) metabolic process; regulation of NAD phosphorylation and dephosphorylation; regulation of nicotinamide adenine dinucleotide metabolic process; regulation of oxidized NAD metabolic process |
| Major function | Controls NAD biosynthesis, salvage, redox cycling and consumption to maintain NAD(H)/NADP(H) homeostasis |
| Key regulators | NAMPT, NMNAT1-3, NADSYN1, QPRT, NADK, PARP1, CD38, SIRT1-7 |
| Disease relevance | Cancer, inflammation, metabolic reprogramming and age-related decline |
What Is GO:1902688?
According to QuickGO, GO:1902688 (regulation of NAD metabolic process) is defined as any process that modulates the frequency, rate or extent of NAD metabolic process. In practical terms, it covers the control of NAD biosynthesis, salvage, phosphorylation/dephosphorylation, redox interconversion and consumption, thereby determining the size and redox balance of cellular NAD(H) and NADP(H) pools.
Why Is regulation of NAD metabolic process Important in Cell Biology?
Regulation of NAD metabolic process is important because NAD+ availability governs redox reactions, mitochondrial function, DNA repair, epigenetic signalling and immune responses. When NAD+ levels fall or the NADH/NAD+ ratio shifts, cells undergo metabolic reprogramming and may activate inflammatory or survival pathways. Consequently, genes annotated to GO:1902688 are attractive therapeutic targets and biomarkers in oncology, immunology and metabolism research.
• NAD+ is required for glycolysis, TCA cycle and oxidative phosphorylation as a redox carrier.
• NAD+ is consumed by PARPs and sirtuins, linking its regulation to DNA repair and chromatin state.
• NAMPT-mediated salvage is a rate-limiting step in maintaining NAD+ in mammalian cells.
• NADK phosphorylation generates NADP(H), which defends against oxidative stress.
• NAD+ depletion in tumours can drive immune evasion and resistance to therapy.
• NADH reductive stress is an emerging driver of metabolic reprogramming.
• Kynurenine pathway flux influences NAD synthesis and immune regulation.
• Copper-signalling pathways can intersect with NAD metabolism during inflammation.
• Histone acetylation enzymes coordinate NAD-dependent metabolism with gene expression.
• CRISPR models of NAD regulators enable causal testing in disease-relevant cells.
What Happens During regulation of NAD metabolic process?
NAD biosynthesis and salvage
In simple terms: Cells build NAD from scratch or recycle it from breakdown products.
NAD+ is synthesized de novo from tryptophan via the kynurenine pathway or through the salvage pathway from nicotinamide and nicotinamide riboside. NAMPT converts nicotinamide to NMN, and NMNAT1-3 convert NMN to NAD+, making these enzymes central regulators of NAD availability. The regulation of these steps determines the basal NAD+ pool and the capacity to respond to stress.
NAD phosphorylation and redox interconversion
In simple terms: NAD can be converted into its phosphorylated form to handle oxidative stress.
NADK phosphorylates NAD+ to NADP+, which is then reduced to NADPH, a key antioxidant cofactor. The balance between NAD(H) and NADP(H) redox couples is a regulated node within GO:1902688, influencing biosynthetic reactions and reactive oxygen species buffering. Dysregulation of this interconversion contributes to metabolic and redox stress.
NAD consumption by signalling enzymes
In simple terms: Enzymes use up NAD to send signals or repair DNA.
PARPs, sirtuins and CD38 consume NAD+ as a substrate, generating nicotinamide and ADP-ribose or O-acetyl-ADP-ribose. This consumption is a major determinant of cellular NAD+ levels and is tightly regulated to avoid depletion. PARP1 activation, for example, can lower NAD+ and affect immune signalling in cancer.
Feedback and circadian control
In simple terms: Cells adjust NAD production based on time of day and energy status.
NAMPT expression is regulated by circadian clocks and metabolic cues, creating rhythmic NAD+ oscillations. Feedback loops involving sirtuins and PARPs further modulate NAD synthesis and consumption. These regulatory circuits integrate energy status with gene expression and are captured under GO:1902688.
Reductive stress and metabolic reprogramming
In simple terms: Too much NADH can force cells to change how they make energy.
An elevated NADH/NAD+ ratio, termed NADH reductive stress, can drive metabolic reprogramming and alter flux through glycolysis and mitochondria. This illustrates how regulation of NAD metabolic process extends beyond absolute NAD+ levels to the redox ratio. Such shifts are relevant to cancer and inflammatory states.
Key Genes Involved in GO:1902688 regulation of NAD metabolic process
The following genes and proteins are established regulators or effectors within GO:1902688, based on their roles in NAD biosynthesis, salvage, phosphorylation and consumption.
| Gene | Major Role | Research Relevance |
|---|---|---|
| NAMPT | Rate-limiting salvage enzyme converting nicotinamide to NMN | Target in cancer and metabolic disease |
| NMNAT1 | Nuclear NMN adenylyltransferase producing NAD+ | NAD pool maintenance and neuroprotection |
| NMNAT2 | Cytoplasmic NMN adenylyltransferase | Axon survival and NAD homeostasis |
| NMNAT3 | Mitochondrial NMN adenylyltransferase | Mitochondrial NAD supply |
| NADSYN1 | Glutamine-dependent NAD synthetase in de novo pathway | NAD biosynthesis and congenital NAD deficiency |
| QPRT | Quinolinate phosphoribosyltransferase in de novo pathway | Kynurenine-NAD axis |
| NADK | Phosphorylates NAD+ to NADP+ | Redox balance and antioxidant defence |
| PARP1 | NAD+-consuming DNA repair enzyme | Cancer immune evasion and NAD depletion |
| CD38 | NAD+ glycohydrolase consuming NAD+ | Inflammation and age-related NAD decline |
| SIRT1 | NAD+-dependent deacetylase | Metabolism, chromatin and stress responses |
| SIRT3 | Mitochondrial NAD+-dependent deacetylase | Mitochondrial metabolism and ROS control |
| SIRT6 | Nuclear NAD+-dependent deacetylase | Genome stability and metabolic regulation |
| TRIM28 | Regulates PARP1 SUMOylation and NAD+ depletion | Tumour immune evasion |
| IDO1 | Kynurenine pathway enzyme upstream of NAD synthesis | Immune regulation and cancer |
| KMO | Kynurenine 3-monooxygenase in NAD de novo pathway | Neuroinflammation and NAD synthesis |
| HAT1 | Histone acetyltransferase linking acetylation to metabolism | NAD-dependent gene expression |
| GAPDH | Glycolytic enzyme sensitive to NADH/NAD+ ratio | Reductive stress readout |
How Is regulation of NAD metabolic process Regulated?
Regulation of NAD metabolic process is controlled at multiple levels. Transcriptional regulation of NAMPT by circadian clocks and metabolic transcription factors sets rhythmic NAD+ synthesis. Post-translational modifications, including SUMOylation of PARP1 by TRIM28, can alter NAD+ consumption and drive depletion in tumours. Feedback inhibition by nicotinamide and redox-sensitive enzyme activity further tunes flux through the pathway. In addition, NADH reductive stress can reprogram metabolism by altering enzyme kinetics and gene expression. These layers ensure that NAD(H) and NADP(H) pools adapt to energy demand, oxidative stress and immune signals.
regulation of NAD metabolic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| TRIM28 | Clear cell renal cell carcinoma immune evasion | Knockout in ccRCC cell lines with immune co-culture |
| PARP1 | NAD+ depletion and DNA repair in cancer | Point-mutation of SUMOylation site |
| NAMPT | Metabolic disease and cancer proliferation | Overexpression and knockout in hepatocytes |
| NADK | Oxidative stress and redox imbalance | Knockout in cancer cells with ROS measurement |
| IDO1 | Neuroinflammation and tumour immune tolerance | Knockout in glioma or immune cells |
Cancer and immune evasion
NAD+ depletion in the tumour microenvironment can suppress anti-tumour immunity. TRIM28-driven PARP1 SUMOylation promotes NAD+ depletion and immune evasion in clear cell renal cell carcinoma, linking GO:1902688 to immunotherapy resistance. Targeting NAD salvage or consumption enzymes is therefore an active therapeutic strategy.
Inflammation and copper signalling
A druggable copper-signalling pathway drives inflammation and intersects with NAD metabolism, highlighting how metal homeostasis and redox cofactors cooperate in immune cells. Regulating NAD levels may modulate inflammatory cytokine production and macrophage function.
Metabolic reprogramming and reductive stress
NADH reductive stress drives metabolic reprogramming, a hallmark of cancer and metabolic disorders. Because GO:1902688 governs the NADH/NAD+ ratio, its dysregulation can shift cells toward fermentative or biosynthetic states.
Neurodegeneration and kynurenine pathway
The kynurenine pathway supplies de novo NAD synthesis and is implicated in neuroinflammation and neurodegeneration. Enzymes such as IDO1 and KMO influence NAD availability and neurotoxic metabolite balance, connecting GO:1902688 to brain health.
From regulation of NAD metabolic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is NAMPT required for NAD+ maintenance? | CRISPR knockout in cancer cell lines |
| Does a specific phosphorylation site regulate NADK activity? | Point mutation knock-in |
| Can a tag reveal NMNAT1 localization? | Tagged knock-in (e.g., GFP) |
| Does NAMPT overexpression increase NAD+ and proliferation? | Overexpression stable line |
| Which genes regulate NAD+ under immune stress? | CRISPR library screening |
| Does PARP1 SUMOylation drive NAD depletion? | Point-mutation of SUMO site |
How to Study the regulation of NAD metabolic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| LC-MS metabolomics | NAD+, NADH, NADP+, NADPH concentrations | Quantify NAD pool changes |
| RNA-seq | Transcriptional changes in NAD pathway genes | Identify regulatory networks |
| Proteomics | Protein abundance and modifications | Detect PARP1 SUMOylation |
| CRISPR knockout screening | Gene essentiality and NAD+ dependence | Discover regulators |
| Seahorse respirometry | Mitochondrial function and redox | Assess metabolic reprogramming |
| Immunoblotting | Protein expression and modification | Validate knockout/knock-in |
| Fluorescent NAD+ biosensors | Real-time NAD+ dynamics | Live-cell imaging |
| ChIP-seq | Chromatin binding of NAD-dependent factors | Link metabolism to transcription |
Metabolomics and NAD+ quantification
Mass spectrometry-based metabolomics measures NAD+, NADH, NADP+ and NADPH levels to assess regulation of NAD metabolic process. These methods are essential for validating genetic perturbations in CRISPR models.
Transcriptomics and RNA-seq
RNA-seq reveals expression changes in NAD biosynthesis and consumption genes after perturbation, helping map regulatory networks under GO:1902688. It can also identify circadian or stress-responsive transcriptional programs.
Proteomics and post-translational modification analysis
Proteomics detects changes in NAD-dependent enzymes and modifications such as PARP1 SUMOylation that regulate NAD consumption. This is critical for understanding feedback and crosstalk.
CRISPR screening and functional genomics
Pooled CRISPR screens identify genes that modulate NAD+ levels or sensitivity to NAD-targeting drugs, directly annotating regulators within GO:1902688. Hits can be validated with single-gene knockouts.
How CRISPR Can Be Used to Study GO:1902688 regulation of NAD metabolic process
Knockout
CRISPR knockout of NAMPT, NMNATs, NADK or PARP1 ablates specific steps in NAD metabolism, revealing their contribution to NAD+ levels and phenotype. Knockout models are foundational for assigning gene function to GO:1902688.
Point Mutation
Point mutations can disable catalytic residues or post-translational modification sites, such as the PARP1 SUMOylation site, to test mechanistic hypotheses without confounding expression changes. This is valuable for dissecting regulatory phosphorylation or acetylation events.
Knock-in
Knock-in of epitope tags or fluorescent reporters at endogenous loci enables real-time tracking of NAD enzymes and their localization. Tagged knock-in lines also facilitate interaction proteomics.
Overexpression
Overexpression of NAMPT or NMNATs boosts NAD+ synthesis and can rescue depletion phenotypes, testing sufficiency within GO:1902688. Overexpression models are useful for drug target validation.
How EDITGENE Supports regulation of NAD metabolic process Research
Researchers studying regulation of NAD metabolic process-related genes often need to determine whether a candidate gene is causally involved in NAD homeostasis or disease phenotypes. EDITGENE provides CRISPR-based cell model services to enable such causal experiments with high specificity and reproducibility.
Contact EDITGENE today to design your custom CRISPR model for regulation of NAD metabolic process research.
Frequently Asked Questions About regulation of NAD metabolic process
What is GO:1902688?
GO:1902688 is the Gene Ontology term for regulation of NAD metabolic process, defined as any process that modulates the frequency, rate or extent of NAD metabolic process.
What genes are involved in regulation of NAD metabolic process?
Key genes include NAMPT, NMNAT1-3, NADSYN1, QPRT, NADK, PARP1, CD38 and sirtuins, which control NAD synthesis, salvage, phosphorylation and consumption.
Why is NAD metabolism important in cancer?
NAD+ depletion can drive immune evasion and metabolic reprogramming in tumours, making NAD regulators therapeutic targets.
How is NAD+ regulated in cells?
NAD+ is regulated by biosynthesis, salvage, phosphorylation to NADP+, and consumption by PARPs, sirtuins and CD38.
What is the role of NAMPT in NAD metabolism?
NAMPT is the rate-limiting enzyme in the salvage pathway that converts nicotinamide to NMN, a direct NAD+ precursor.
What is NADH reductive stress?
NADH reductive stress is an elevated NADH/NAD+ ratio that drives metabolic reprogramming and is linked to disease.
How can CRISPR be used to study NAD metabolism?
CRISPR knockout, point mutation, knock-in and overexpression models allow causal testing of NAD regulatory genes.
What diseases are linked to NAD metabolic process?
Cancer, inflammation, neurodegeneration and metabolic disorders are associated with dysregulated NAD metabolism.
What methods measure NAD+ levels?
LC-MS metabolomics and fluorescent biosensors quantify NAD+ and related metabolites.
What is the kynurenine pathway's role in NAD synthesis?
The kynurenine pathway provides de novo NAD+ synthesis from tryptophan and is implicated in neuroinflammation.
Conclusion
GO:1902688 (regulation of NAD metabolic process) is a central biological process that integrates biosynthesis, salvage, redox interconversion and consumption to maintain NAD(H) and NADP(H) homeostasis. Its dysregulation is linked to cancer, inflammation, neurodegeneration and metabolic reprogramming, making it a high-value target for functional genomics. CRISPR-based models and multi-omics methods now enable precise dissection of these regulatory mechanisms, supporting therapeutic discovery.
References
- 1. Savitz J. 2020. The kynurenine pathway: a finger in every pie.. Mol Psychiatry 25(1):131-147 PMID: 30980044
- 2. Chini CCS et al.. 2021. Evolving concepts in NAD(+) metabolism.. Cell Metab 33(6):1076-1087 PMID: 33930322
- 3. Xie N et al.. 2020. NAD(+) metabolism: pathophysiologic mechanisms and therapeutic potential.. Signal Transduct Target Ther 5(1):227 PMID: 33028824
- 4. Solier S et al.. 2023. A druggable copper-signalling pathway that drives inflammation.. Nature 617(7960):386-394 PMID: 37100912
- 5. Shen Y et al.. 2015. Histone Acetylation Enzymes Coordinate Metabolism and Gene Expression.. Trends Plant Sci 20(10):614-621 PMID: 26440431
- 6. Xiao W et al.. 2018. NAD(H) and NADP(H) Redox Couples and Cellular Energy Metabolism.. Antioxid Redox Signal 28(3):251-272 PMID: 28648096
- 7. Zhan X et al.. 2025. TRIM28 drives immune evasion via PARP1 SUMOylation and NAD(+) depletion in clear cell renal cell carcinoma.. J Immunother Cancer 13(10) PMID: 41135953
- 8. Yang R et al.. 2026. NADH reductive stress drives metabolic reprogramming.. Trends Cell Biol 36(3):177-189 PMID: 40769852
