GO:1901307 positive regulation of spermidine biosynthetic process: Polyamine Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1901307 describes any process that activates or increases the frequency, rate or extent of spermidine biosynthetic process.
• Spermidine biosynthesis is a branch of polyamine metabolism that converts putrescine to spermidine via spermidine synthase, and its positive regulation is critical for cellular growth, stress responses, and autophagy.
• Key enzymes and regulators include spermidine synthase (SRM), S-adenosylmethionine decarboxylase (AMD1), and ornithine decarboxylase (ODC1), which are often upregulated in cancer and inflammatory conditions.
• Dysregulation of spermidine biosynthesis is linked to hepatocellular carcinoma, pancreatic cancer, periodontitis, and podocyte injury, making it a therapeutic target.
• Plant homologs such as SlWRKY42 and SlMYC2 positively regulate spermidine biosynthesis to enhance saline-alkali tolerance, demonstrating evolutionary conservation.
• CRISPR-based knockout, knock-in, and overexpression models are essential to dissect causal roles of spermidine biosynthetic regulators in disease and development.
Description
Spermidine is a ubiquitous polyamine essential for cell proliferation, differentiation, and survival across eukaryotes. The biosynthetic route to spermidine involves the decarboxylation of S-adenosylmethionine by AMD1 and the transfer of an aminopropyl group to putrescine by spermidine synthase (SRM). The Gene Ontology term GO:1901307, positive regulation of spermidine biosynthetic process, captures the regulatory inputs that enhance the rate or extent of this pathway. Understanding this term is vital because spermidine levels are tightly linked to autophagy, translation, and stress resistance, and their misregulation contributes to cancer, metabolic disorders, and inflammatory diseases. Researchers studying polyamine biology need precise tools to manipulate and measure this regulatory process, and CRISPR-based models offer a direct way to test causality.
positive regulation of spermidine biosynthetic process At A Glance
| GO ID | GO:1901307 |
|---|---|
| GO term | positive regulation of spermidine biosynthetic process |
| Ontology | biological_process |
| Synonym | activation of spermidine biosynthesis; upregulation of spermidine formation; positive regulation of spermidine synthesis |
| Major function | Increases the rate or extent of spermidine production, impacting polyamine homeostasis, autophagy, and cell growth |
| Related enzymes | Spermidine synthase (SRM), S-adenosylmethionine decarboxylase (AMD1), ornithine decarboxylase (ODC1) |
| Disease relevance | Cancer, inflammation, kidney injury, and plant stress tolerance |
| Research tools | CRISPR knockout/knock-in, overexpression, metabolomics, and autophagy flux assays |
What Is GO:1901307?
GO:1901307 is a biological process term defined as any process that activates or increases the frequency, rate or extent of spermidine biosynthetic process. In other words, it encompasses molecular events that boost the production of spermidine from its precursors, such as putrescine, by upregulating enzyme activity or expression.
Why Is positive regulation of spermidine biosynthetic process Important in Cell Biology?
Positive regulation of spermidine biosynthesis is important because spermidine is a central metabolite that influences fundamental processes such as autophagy, translation, and cell survival. Its upregulation can protect cells from stress, but in cancer it can fuel proliferation and immune evasion. Therefore, understanding how this process is regulated offers opportunities for therapeutic intervention in oncology, nephrology, and inflammatory diseases.
• Spermidine biosynthesis supports autophagy and maintains the filtration barrier in podocytes, with reciprocal regulation between spermidine and autophagy.
• In hepatocellular carcinoma, spermine synthase and polyamine metabolism contribute to macrophage M2 polarization and antitumor immunity suppression.
• Pancreatic cancer pathogenesis involves the MUC1-HIF-1α axis that remodels polyamine metabolism, including spermidine biosynthesis.
• Periodontitis-induced bone loss is restrained by PINK1, which prevents osteoclast mitophagy impairment, linking mitochondrial function to polyamine-related stress responses.
• In plants, the SlWRKY42-SlMYC2 module enhances saline-alkali tolerance by activating jasmonic acid signaling and spermidine biosynthesis.
• Polyamine acetylation and catabolism intersect with biosynthesis, affecting overall polyamine pools and cellular functions.
• Yeast necrosis studies highlight the role of polyamines in cell death pathways, underscoring the importance of balanced spermidine levels.
• The old and new biochemistry of polyamines reveals conserved regulatory mechanisms that can be targeted by CRISPR screens.
What Happens During positive regulation of spermidine biosynthetic process?
Transcriptional activation of spermidine biosynthetic genes
In simple terms: Cells can make more spermidine by turning up the genes that build it.
Positive regulation often begins with increased transcription of genes encoding spermidine synthase (SRM) and S-adenosylmethionine decarboxylase (AMD1). In tomato, the SlWRKY42-SlMYC2 module synergistically activates the jasmonic acid signaling and spermidine biosynthesis pathway, leading to enhanced saline-alkali tolerance. This transcriptional boost elevates enzyme levels and drives higher flux through the pathway.
Post-translational modulation of enzyme activity
In simple terms: Even if enzyme amounts stay the same, their activity can be switched on.
Enzymes such as ODC1 and AMD1 are subject to post-translational regulation, including phosphorylation and interaction with regulatory proteins, which can increase their catalytic efficiency. Polyamine acetylation also influences the balance between synthesis and catabolism, indirectly affecting spermidine production.
Substrate availability and flux control
In simple terms: More raw material means more product.
The availability of putrescine and decarboxylated S-adenosylmethionine (dcSAM) directly limits spermidine synthesis. Positive regulation can therefore involve increased uptake or synthesis of these precursors, as seen in cancer cells with remodeled polyamine metabolism.
Integration with autophagy and stress responses
In simple terms: Spermidine and autophagy help each other in a loop.
Spermidine induces autophagy, and autophagy can in turn affect polyamine levels, creating a reciprocal regulation loop. In podocytes, this interplay maintains the filtration barrier, and its disruption leads to kidney injury. Thus, positive regulation of spermidine biosynthesis is often coupled to autophagic flux.
Role in immune and inflammatory signaling
In simple terms: Spermidine can change how immune cells behave.
In hepatocellular carcinoma, spermine synthase engages in macrophage M2 polarization to sabotage antitumor immunity, highlighting how polyamine biosynthesis can shape the tumor microenvironment. Similarly, in periodontitis, PINK1 restrains bone loss by preventing osteoclast mitophagy impairment, linking mitochondrial quality control to polyamine-related stress.
Key Genes Involved in GO:1901307 positive regulation of spermidine biosynthetic process
The following genes and proteins are central to the positive regulation of spermidine biosynthetic process, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SRM | Spermidine synthase; converts putrescine to spermidine | Target for knockout to reduce spermidine levels |
| AMD1 | S-adenosylmethionine decarboxylase; provides dcSAM for spermidine synthesis | Key regulatory node in polyamine flux |
| ODC1 | Ornithine decarboxylase; produces putrescine, the substrate for spermidine | Often overexpressed in cancer; target for inhibition |
| SMS | Spermine synthase; converts spermidine to spermine | Linked to M2 polarization in HCC |
| SAT1 | Spermidine/spermine N1-acetyltransferase; catabolizes polyamines | Affects spermidine pool size |
| PINK1 | Mitochondrial kinase; prevents osteoclast mitophagy impairment | Links mitochondrial function to bone loss |
| MUC1 | Transmembrane mucin; regulates HIF-1α and polyamine metabolism | Oncogenic driver in pancreatic cancer |
| HIF-1α | Hypoxia-inducible factor; remodels polyamine metabolism | Therapeutic target in cancer |
| SlWRKY42 | Plant transcription factor; activates spermidine biosynthesis | Enhances saline-alkali tolerance |
| SlMYC2 | Plant transcription factor; synergizes with SlWRKY42 | Regulates jasmonic acid and spermidine pathways |
| mTOR | Kinase; integrates nutrient signals to control growth | Indirectly regulates polyamine synthesis |
| AMPK | Energy sensor; may modulate polyamine metabolism | Potential regulator of spermidine biosynthesis |
| Autophagy-related genes (ATG) | Mediate autophagic flux; reciprocally regulated by spermidine | Key effectors in podocyte and cancer models |
| NF-κB | Inflammatory transcription factor; may influence polyamine genes | Links inflammation to spermidine regulation |
| c-MYC | Oncogene; drives polyamine biosynthetic gene expression | Frequently dysregulated in cancer |
| p53 | Tumor suppressor; can repress polyamine synthesis | Loss of function increases spermidine production |
| PPARγ | Nuclear receptor; modulates metabolic and inflammatory pathways | Potential indirect regulator |
How Is positive regulation of spermidine biosynthetic process Regulated?
The positive regulation of spermidine biosynthetic process is controlled at multiple levels. Transcriptional activation by factors such as SlWRKY42-SlMYC2 in plants enhances pathway flux. In mammalian cells, oncogenic signals like MUC1-HIF-1α remodel polyamine metabolism, increasing spermidine synthesis. Post-translational mechanisms, including acetylation by SAT1, balance synthesis and catabolism. Additionally, autophagy and spermidine exhibit reciprocal regulation, where spermidine induces autophagy and autophagy can modulate polyamine levels. These layers ensure that spermidine production matches cellular needs for growth, stress resistance, and survival.
positive regulation of spermidine biosynthetic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SMS | Hepatocellular carcinoma; M2 polarization | Knockout in HCC cell lines and macrophage co-culture |
| MUC1 | Pancreatic cancer; polyamine remodeling | Knockdown or knockout in pancreatic cancer cells |
| PINK1 | Periodontitis-induced bone loss | Knockout in osteoclast precursors |
| SRM | Podocyte injury; autophagy imbalance | Podocyte-specific knockout |
| SlWRKY42 | Saline-alkali tolerance in tomato | Overexpression in tomato plants |
Cancer
In hepatocellular carcinoma, spermine synthase and polyamine metabolism contribute to macrophage M2 polarization, suppressing antitumor immunity. Pancreatic cancer pathogenesis involves the MUC1-HIF-1α axis that remodels polyamine metabolism, including spermidine biosynthesis, promoting tumor growth. Targeting positive regulators of spermidine biosynthesis may therefore offer therapeutic strategies.
Kidney injury
In podocytes, reciprocal regulation of spermidine and autophagy maintains the filtration barrier, and its disruption leads to kidney injury. Modulating spermidine biosynthesis could protect podocyte function.
Inflammatory bone loss
Periodontitis-induced bone loss is restrained by PINK1, which prevents osteoclast mitophagy impairment, linking mitochondrial dysfunction and polyamine-related stress to inflammatory bone destruction. Spermidine biosynthesis may influence osteoclast survival and bone resorption.
Plant stress tolerance
The SlWRKY42-SlMYC2 module enhances tomato saline-alkali tolerance by activating jasmonic acid signaling and spermidine biosynthesis, demonstrating the importance of this pathway in plant stress adaptation.
From positive regulation of spermidine biosynthetic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of SRM reduce spermidine levels and affect autophagy? | SRM knockout cell line |
| Does a point mutation in AMD1 alter enzyme activity? | AMD1 point-mutation knock-in |
| Does overexpression of SlWRKY42 enhance spermidine biosynthesis? | SlWRKY42 overexpression in tomato |
| Does tagged SRM localize to specific subcellular compartments? | Tagged knock-in of SRM |
| Does MUC1 knockout alter polyamine metabolism in pancreatic cancer? | MUC1 knockout in pancreatic cancer cells |
| Does PINK1 knockout exacerbate osteoclast mitophagy impairment? | PINK1 knockout in osteoclasts |
How to Study the positive regulation of spermidine biosynthetic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| LC-MS metabolomics | Spermidine and polyamine levels | Quantify pathway output |
| RNA-seq | Gene expression changes | Identify transcriptional regulators |
| Western blot | Protein levels of SRM, AMD1, LC3B | Validate knockout or overexpression |
| CRISPR knockout screen | Gene essentiality or reporter activation | Discover positive regulators |
| CRISPR activation screen | Overexpression of target genes | Identify activators of spermidine biosynthesis |
| Immunofluorescence | Subcellular localization of enzymes | Study tagged knock-in models |
| Autophagy flux assay | LC3B turnover | Assess functional impact |
| qPCR | mRNA levels of biosynthetic genes | Rapid validation of transcriptional changes |
Metabolomics and polyamine profiling
Mass spectrometry-based metabolomics quantifies spermidine and related polyamines, providing direct readout of pathway activity. This is essential to confirm that a genetic perturbation alters spermidine biosynthesis.
Transcriptomics and RNA-seq
RNA-seq can reveal changes in expression of spermidine biosynthetic genes such as SRM and AMD1 upon regulatory inputs. It helps identify transcriptional networks controlling the pathway.
Autophagy flux assays
LC3B and p62 immunoblotting or fluorescence microscopy measure autophagic flux, which is reciprocally regulated by spermidine. These assays link spermidine biosynthesis to cellular degradation pathways.
CRISPR screens and functional genomics
Genome-wide CRISPR knockout or activation screens can identify positive regulators of spermidine biosynthesis by coupling polyamine reporters or fitness readouts. Such screens uncover novel genes and pathways.
How CRISPR Can Be Used to Study GO:1901307 positive regulation of spermidine biosynthetic process
Knockout
CRISPR knockout of SRM, AMD1, or ODC1 can abolish or reduce spermidine biosynthesis, enabling loss-of-function studies in cancer, kidney, and immune cells. Knockout models help determine whether a gene is required for pathway activity and downstream phenotypes.
Point Mutation
Introducing point mutations in catalytic residues of SRM or AMD1 via CRISPR can dissect enzyme mechanism and regulation without completely eliminating protein expression. Such models are valuable for structure-function studies.
Knock-in
Tagged knock-in of endogenous SRM or AMD1 with fluorescent or affinity tags allows real-time tracking of protein localization and interactions. This approach preserves native regulation and provides insights into pathway dynamics.
Overexpression
CRISPR activation or cDNA overexpression of SlWRKY42, SlMYC2, or SRM can boost spermidine biosynthesis, mimicking positive regulation. Overexpression models are useful to test sufficiency and therapeutic potential.
How EDITGENE Supports positive regulation of spermidine biosynthetic process Research
Researchers studying positive regulation of spermidine biosynthetic process-related genes often need to determine whether a candidate gene is causally involved in pathway activation or disease phenotypes. EDITGENE provides comprehensive CRISPR services to generate precisely engineered cell and animal models, enabling rigorous functional validation.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of spermidine biosynthetic process research.
Frequently Asked Questions About positive regulation of spermidine biosynthetic process
What is GO:1901307?
GO:1901307 is the Gene Ontology term for positive regulation of spermidine biosynthetic process, defined as any process that activates or increases the frequency, rate or extent of spermidine biosynthesis.
What genes are involved in positive regulation of spermidine biosynthetic process?
Key genes include SRM, AMD1, ODC1, SMS, and in plants SlWRKY42 and SlMYC2, as well as upstream regulators like MUC1 and HIF-1α.
How is spermidine biosynthesis regulated?
It is regulated transcriptionally, post-translationally, and through substrate availability, with inputs from oncogenic and stress signaling pathways.
Why is spermidine biosynthesis important in cancer?
Spermidine supports proliferation and immune evasion; its upregulation is linked to hepatocellular carcinoma and pancreatic cancer.
What diseases are associated with spermidine biosynthesis?
Cancer, kidney injury, periodontitis-induced bone loss, and plant stress responses are associated with altered spermidine biosynthesis.
How can I study positive regulation of spermidine biosynthetic process?
Use CRISPR knockout, knock-in, overexpression, metabolomics, and autophagy assays to dissect the pathway.
What is the role of autophagy in spermidine regulation?
Spermidine and autophagy are reciprocally regulated; spermidine induces autophagy, and autophagy can modulate polyamine levels.
Which model organisms are used to study spermidine biosynthesis?
Human cell lines, mouse models, yeast, and plants like tomato are commonly used.
What are the CRISPR applications for spermidine research?
CRISPR enables knockout, point mutation, knock-in, and overexpression of spermidine-related genes to test causality.
How does EDITGENE support spermidine biosynthesis research?
EDITGENE provides custom CRISPR models, library screening, and bioinformatics to study positive regulation of spermidine biosynthetic process.
Conclusion
GO:1901307, positive regulation of spermidine biosynthetic process, is a critical biological process that governs polyamine homeostasis and impacts cancer, kidney disease, inflammation, and plant stress tolerance. Understanding its regulatory mechanisms through CRISPR-based models and multi-omics approaches will advance therapeutic development and basic biology.
References
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- 2. Sun Y et al.. 2025. Spermine synthase engages in macrophages M2 polarization to sabotage antitumor immunity in hepatocellular carcinoma.. Cell Death Differ 32(3):573-586 PMID: 39658701
- 3. Liu X et al.. 2025. The SlWRKY42-SlMYC2 module synergistically enhances tomato saline-alkali tolerance by activating the jasmonic acid signaling and spermidine biosynthesis pathway.. J Integr Plant Biol 67(5):1254-1273 PMID: 39873954
- 4. Murthy D et al.. 2024. The MUC1-HIF-1α signaling axis regulates pancreatic cancer pathogenesis through polyamine metabolism remodeling.. Proc Natl Acad Sci U S A 121(14):e2315509121 PMID: 38547055
- 5. Liang W et al.. 2020. A reciprocal regulation of spermidine and autophagy in podocytes maintains the filtration barrier.. Kidney Int 98(6):1434-1448 PMID: 32603735
- 6. Seiler N. 1987. Functions of polyamine acetylation.. Can J Physiol Pharmacol 65(10):2024-35 PMID: 3322538
- 7. Eisenberg T et al.. 2010. Necrosis in yeast.. Apoptosis 15(3):257-68 PMID: 20238475
- 8. Bae DH et al.. 2018. The old and new biochemistry of polyamines.. Biochim Biophys Acta Gen Subj 1862(9):2053-2068 PMID: 29890242
