GO:2000638 regulation of SREBP signaling pathway: Lipid Homeostasis Control, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:2000638 (regulation of SREBP signaling pathway) describes any process that modulates the frequency, rate or extent of SREBP signaling, the master transcriptional program controlling cholesterol, fatty acid and phospholipid synthesis.
• SREBP transcription factors are activated by sterol depletion and by signaling inputs including PI3K-AKT-mTOR, which links nutrient status to lipogenic gene expression.
• Dysregulated SREBP signaling is a hallmark of cancer, where it supports membrane biogenesis and survival, and is being pursued as a therapeutic target in hepatocellular carcinoma and glioblastoma.
• SREBP activity is also modulated by mechanical cues from the extracellular matrix through Lipin-1, showing that regulation extends beyond classical sterol sensing.
• SREBP signaling intersects with immune and antiviral programs, as negative regulation of SREBP-1/FAS activates RIG-1/TBK1-mediated IFN-I signaling.
• CRISPR knockout, point-mutation, knock-in and overexpression models, combined with CRISPR library screening and bioinformatics, are central tools for dissecting regulators of this pathway.
Description
The Gene Ontology term GO:2000638, regulation of SREBP signaling pathway, refers to any process that modulates the frequency, rate or extent of the SREBP signaling pathway. SREBP (sterol regulatory element-binding protein) transcription factors are the principal regulators of lipid biosynthesis, controlling genes required for cholesterol, fatty acid, triglyceride and phospholipid production. Because membrane lipid composition must be matched to cell growth, proliferation and stress, the regulation of SREBP signaling sits at the interface of metabolism, signaling and gene expression. Researchers study GO:2000638 to understand how cells sense sterols and nutrients and how they convert those cues into transcriptional outputs. The pathway is regulated by sterol availability, by growth factor and nutrient signaling cascades such as PI3K-AKT-mTOR, and by mechanical and immune inputs. Dysregulation of SREBP signaling contributes to metabolic disease, cancer and immune dysfunction, making its regulators attractive experimental and therapeutic targets. This article summarizes the definition, mechanism, key genes, disease links and research methods relevant to GO:2000638, based on published literature.
regulation of SREBP signaling pathway At A Glance
| GO ID | GO:2000638 |
|---|---|
| GO term | regulation of SREBP signaling pathway |
| Ontology | biological_process |
| Synonym | regulation of SREBP-mediated signaling pathway; regulation of SREBP-mediated signalling pathway |
| Definition | Any process that modulates the frequency, rate or extent of the SREBP signaling pathway. |
| Major function | Controls the activity of SREBP transcription factors and thus the expression of lipogenic genes. |
| Key upstream inputs | Sterol status, PI3K-AKT-mTOR signaling, mechanical cues and immune signaling. |
| Representative regulators | mTOR, PI3K-AKT, Lipin-1, and negative regulators of SREBP-1/FAS. |
| Disease relevance | Cancer, metabolic dysfunction and immune regulation. |
What Is GO:2000638?
GO:2000638 is a biological process term defined as any process that modulates the frequency, rate or extent of the SREBP signaling pathway. In practice, this includes mechanisms that activate or inhibit SREBP transcription factors, their proteolytic processing, their nuclear translocation, or their transcriptional activity on target genes involved in lipid synthesis. The term is synonymous with regulation of SREBP-mediated signaling pathway and regulation of SREBP-mediated signalling pathway. It is a regulatory term: it does not describe the SREBP pathway itself, but the processes that control its intensity, duration or output.
Why Is regulation of SREBP signaling pathway Important in Cell Biology?
Regulation of SREBP signaling is important because it determines how cells allocate resources to lipid synthesis, a process required for membrane expansion during growth and proliferation. When this regulation is perturbed, cells can accumulate excess lipids or fail to produce sufficient membrane components, contributing to metabolic stress, ferroptosis sensitivity and tumor progression. Because SREBP signaling is controlled by nutrient-sensing pathways such as mTOR, it also connects environmental conditions to gene expression programs. Understanding GO:2000638 therefore provides insight into basic cell biology and into disease mechanisms where lipid metabolism is rewired.
• Controls expression of genes for cholesterol, fatty acid and phospholipid synthesis.
• Integrates nutrient and growth factor signals through PI3K-AKT-mTOR.
• Supports membrane biogenesis during cell growth and proliferation.
• Modulates sensitivity to ferroptosis, a form of lipid peroxidation-driven cell death.
• Is dysregulated in hepatocellular carcinoma and other cancers.
• Links extracellular matrix mechanics to lipid metabolism via Lipin-1.
• Interacts with antiviral innate immune signaling through SREBP-1/FAS.
• Is a target for pharmacological inhibitors such as fatostatin in glioblastoma models.
• Provides a mechanistic basis for understanding metabolic reprogramming in tumors.
• Offers entry points for CRISPR-based functional genomics of lipid metabolism.
What Happens During regulation of SREBP signaling pathway?
Sterol sensing and SREBP processing
In simple terms: Cells check their cholesterol levels and decide whether to make more.
SREBP signaling is activated when sterol levels are low, leading to proteolytic processing and nuclear translocation of SREBP transcription factors, which then activate lipogenic genes. Regulation of this step determines how much active SREBP reaches the nucleus and how strongly target genes are transcribed.
Growth factor and nutrient signaling inputs
In simple terms: Signals that tell cells to grow also tell them to make lipids.
The PI3K-AKT-mTOR pathway promotes SREBP activity and lipogenesis, coupling nutrient availability to lipid synthesis. Oncogenic activation of PI3K-AKT-mTOR suppresses ferroptosis via SREBP-mediated lipogenesis, showing that this regulatory arm has direct survival consequences.
Mechanical and extracellular matrix cues
In simple terms: The stiffness of the surroundings can change how cells handle fat.
Extracellular matrix mechanical cues regulate lipid metabolism through Lipin-1 and SREBP, demonstrating that regulation of SREBP signaling is not limited to soluble sterol or growth factor signals. This mechanical regulation can influence cell behavior in tissues with different stiffness.
Negative regulation and immune crosstalk
In simple terms: Turning down SREBP can turn on antiviral defenses.
Negative regulation of SREBP-1/FAS signaling molecules activates the RIG-1/TBK1-mediated IFN-I pathway to inhibit viral replication, illustrating that SREBP regulation intersects with innate immunity. This crosstalk means that regulators of GO:2000638 can influence host defense.
Pharmacological modulation
In simple terms: Drugs can block SREBP and change how cells die.
Fatostatin inhibits SREBP and induces ferroptosis through inhibition of the AKT/mTORC1/GPX4 signaling pathway in glioblastoma, providing an example of how pharmacological regulation of SREBP signaling can be exploited experimentally. Such tools help researchers probe the consequences of modulating GO:2000638.
Key Genes Involved in GO:2000638 regulation of SREBP signaling pathway
The following genes and proteins are central to the regulation of SREBP signaling and are frequently studied in this context.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SREBF1 | Encodes SREBP-1, a transcription factor controlling fatty acid synthesis genes. | Target for knockout and overexpression studies in cancer and metabolism. |
| SREBF2 | Encodes SREBP-2, a transcription factor controlling cholesterol synthesis genes. | Used to dissect sterol-dependent regulation. |
| MTOR | Kinase that integrates nutrient signals and promotes SREBP activity. | Key upstream regulator for perturbation experiments. |
| PIK3CA | PI3K catalytic subunit upstream of AKT and mTOR. | Oncogenic input to SREBP-mediated lipogenesis. |
| AKT1 | Kinase that activates mTOR and lipogenic programs. | Node for point-mutation and inhibitor studies. |
| LPIN1 | Lipin-1 links mechanical cues to SREBP regulation. | Model for mechanotransduction studies. |
| FASN | Fatty acid synthase, a SREBP target and negative regulator node. | Used to study SREBP-1/FAS immune crosstalk. |
| GPX4 | Lipid peroxidase whose regulation intersects with SREBP and ferroptosis. | Readout for ferroptosis in SREBP-modulated cells. |
| SCAP | Sterol-sensing escort protein for SREBP processing. | Core component of sterol-regulated activation. |
| INSIG1 | Retains SREBP in the ER under sterol-replete conditions. | Negative regulator for knockout studies. |
| INSIG2 | Paralog of INSIG1 in SREBP retention. | Redundancy studies with INSIG1. |
| MBTPS1 | Site-1 protease that cleaves SREBP. | Processing enzyme for mechanistic assays. |
| MBTPS2 | Site-2 protease that releases SREBP. | Processing enzyme for mechanistic assays. |
| NR1H2 | LXR beta, a nuclear receptor influencing lipid metabolism. | Cross-talk with SREBP regulation. |
| NR1H3 | LXR alpha, a nuclear receptor influencing lipid metabolism. | Cross-talk with SREBP regulation. |
| RPTOR | Component of mTORC1 that promotes SREBP activity. | Target for mTORC1-specific perturbation. |
| TSC1 | Negative regulator of mTORC1 upstream of SREBP. | Knockout model for mTORC1 activation. |
| TSC2 | Negative regulator of mTORC1 upstream of SREBP. | Knockout model for mTORC1 activation. |
How Is regulation of SREBP signaling pathway Regulated?
Regulation of SREBP signaling is itself regulated at multiple levels. The mTOR pathway integrates nutrient and growth factor signals to promote SREBP activity and lipogenesis. Sterol availability controls the proteolytic processing of SREBP through sterol-sensing components such as SCAP and INSIG proteins. Mechanical cues from the extracellular matrix modulate SREBP through Lipin-1. In addition, negative regulation of SREBP-1/FAS can activate antiviral innate immune signaling, showing that SREBP regulation is embedded in broader cellular decision-making. Pharmacological agents such as fatostatin can inhibit SREBP and alter downstream pathways including AKT/mTORC1/GPX4.
regulation of SREBP signaling pathway and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SREBF1 | Hepatocellular carcinoma and lipogenesis | Knockout and overexpression in liver cancer cell lines |
| MTOR | Cancer metabolism and ferroptosis suppression | Point-mutation and inhibitor studies |
| GPX4 | Ferroptosis regulation in glioblastoma | Knockout and rescue models |
| FASN | Antiviral innate immunity via SREBP-1/FAS | Knockdown and overexpression in infected cells |
| LPIN1 | Mechanotransduction and lipid metabolism | Knockout in cells on variable stiffness matrices |
Cancer and tumor lipid metabolism
SREBP signaling is frequently activated in cancer to support membrane biogenesis and proliferation. In hepatocellular carcinoma, SREBP-1 regulation and targeting have been studied as a therapeutic strategy. In glioblastoma, inhibition of SREBP by fatostatin induces ferroptosis through the AKT/mTORC1/GPX4 axis, linking SREBP regulation to cell death pathways. Oncogenic PI3K-AKT-mTOR signaling suppresses ferroptosis via SREBP-mediated lipogenesis, further connecting this pathway to tumor survival.
Metabolic and immune dysfunction
Because SREBP controls lipid synthesis, its dysregulation contributes to metabolic imbalance. Negative regulation of SREBP-1/FAS activates RIG-1/TBK1-mediated IFN-I signaling to inhibit viral replication, indicating that SREBP regulation influences antiviral immunity. Lipid signaling also enforces functional specialization of regulatory T cells in tumors, showing that SREBP-related lipid programs affect immune cell states.
Ferroptosis and oxidative stress
SREBP-mediated lipogenesis can suppress ferroptosis, a lipid peroxidation-dependent cell death, thereby promoting survival under oxidative stress. Conversely, inhibition of SREBP signaling can sensitize cells to ferroptosis, as shown for fatostatin in glioblastoma. These findings position regulation of SREBP signaling as a determinant of cell death sensitivity.
From regulation of SREBP signaling pathway-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is a candidate gene required for SREBP pathway activity? | CRISPR knockout cell line |
| Does a specific amino acid change alter SREBP regulation? | Point-mutation knock-in |
| Can a tagged SREBP regulator be tracked in live cells? | Tagged knock-in |
| Does overexpression of a regulator increase lipogenic gene expression? | Overexpression cell model |
| Which genes modulate sensitivity to SREBP inhibition? | CRISPR library screening |
| How does mTORC1 activation affect SREBP output? | TSC1/TSC2 knockout or RPTOR perturbation |
How to Study the regulation of SREBP signaling pathway Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Expression of SREBP target genes | Comparing knockout vs wild-type cells |
| Lipidomics | Lipid species abundance | Assessing metabolic output of SREBP regulation |
| Proteomics | Protein abundance and modifications | Identifying pathway components |
| CRISPR library screening | Gene requirements for SREBP activity | Unbiased discovery of regulators |
| Immunoblotting | SREBP processing and target protein levels | Validating mechanistic hypotheses |
| Fluorescence imaging | Lipid droplets and reporter activity | Live-cell assessment of pathway state |
| Ferroptosis assays | Lipid peroxidation and cell death | Testing SREBP inhibition consequences |
Transcriptomic profiling of lipogenic genes
RNA-seq can measure expression of SREBP target genes involved in cholesterol and fatty acid synthesis, providing a readout of pathway regulation. Comparing knockout or overexpression models reveals which regulators control the SREBP transcriptional program.
Proteomic and lipidomic analysis
Proteomics and lipidomics can quantify changes in enzymes and lipid species downstream of SREBP regulation. Such approaches help connect regulators of GO:2000638 to specific metabolic outputs.
Functional screens and CRISPR libraries
CRISPR library screening enables unbiased discovery of genes that modulate SREBP signaling and lipogenesis. Hits can be validated with individual knockout or point-mutation models.
Pharmacological and imaging assays
Compounds such as fatostatin can be used to inhibit SREBP and assess downstream effects including ferroptosis. Imaging of lipid droplets and fluorescent reporters can visualize pathway activity in live cells.
How CRISPR Can Be Used to Study GO:2000638 regulation of SREBP signaling pathway
Knockout
CRISPR knockout of candidate regulators such as SREBF1, MTOR or LPIN1 can test whether they are required for SREBP signaling and lipogenic gene expression. Knockout models are widely used to establish causality in lipid metabolism studies.
Point Mutation
Point-mutation knock-in can model specific amino acid changes in regulators like AKT1 or mTOR to dissect signaling events that control SREBP activity. Such models help distinguish catalytic from scaffolding functions.
Knock-in
Tagged knock-in of SREBP pathway components enables tracking of protein localization and processing in live cells. Knock-in reporters can also be used to monitor transcriptional output of the pathway.
Overexpression
Overexpression of SREBP regulators or SREBP itself can drive lipogenic gene expression and reveal sufficiency for pathway activation. Overexpression models are useful for testing downstream phenotypes such as ferroptosis resistance.
How EDITGENE Supports regulation of SREBP signaling pathway Research
Researchers studying regulation of SREBP signaling pathway-related genes often need to determine whether a candidate gene is causally involved in controlling lipid synthesis, processing or downstream phenotypes. CRISPR-based models provide a direct way to test necessity and sufficiency, while library screening and bioinformatics can nominate new regulators for follow-up.
Contact EDITGENE today to design your custom CRISPR model for regulation of SREBP signaling pathway research.
Frequently Asked Questions About regulation of SREBP signaling pathway
What is GO:2000638 regulation of SREBP signaling pathway?
GO:2000638 is a Gene Ontology biological process term defined as any process that modulates the frequency, rate or extent of the SREBP signaling pathway.
What genes are involved in regulation of SREBP signaling pathway?
Key genes include SREBF1, SREBF2, MTOR, PIK3CA, AKT1, LPIN1, FASN, GPX4, SCAP, INSIG1, INSIG2, MBTPS1 and MBTPS2.
How is SREBP signaling regulated by mTOR?
The PI3K-AKT-mTOR pathway promotes SREBP activity and lipogenesis, linking nutrient signals to lipid synthesis.
Why is regulation of SREBP signaling important in cancer?
SREBP signaling supports membrane biogenesis and survival in cancer cells, and its inhibition can induce ferroptosis in models such as glioblastoma.
What is the role of Lipin-1 in SREBP regulation?
Lipin-1 mediates mechanical cue-dependent regulation of lipid metabolism through SREBP.
Does SREBP signaling affect immunity?
Negative regulation of SREBP-1/FAS activates RIG-1/TBK1-mediated IFN-I signaling to inhibit viral replication.
What experimental models are used to study GO:2000638?
CRISPR knockout, point-mutation, knock-in, overexpression, library screening and bioinformatics approaches are commonly used.
How does fatostatin affect SREBP signaling?
Fatostatin inhibits SREBP and induces ferroptosis through inhibition of the AKT/mTORC1/GPX4 pathway in glioblastoma.
What diseases are linked to SREBP signaling dysregulation?
Cancer, metabolic dysfunction and immune-related conditions have been linked to altered SREBP signaling.
What methods measure SREBP pathway activity?
RNA-seq, lipidomics, proteomics, immunoblotting, imaging and ferroptosis assays are used to measure pathway activity.
Conclusion
GO:2000638, regulation of SREBP signaling pathway, captures the diverse mechanisms that control SREBP-dependent lipid synthesis, from sterol sensing to mTOR signaling, mechanical cues and immune crosstalk. Its dysregulation is central to cancer metabolism, ferroptosis sensitivity and immune regulation, making it a high-value area for functional genomics. CRISPR-based knockout, point-mutation, knock-in and overexpression models, together with library screening and bioinformatics, provide robust tools to dissect these regulatory mechanisms.
References
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- 3. Yi J et al.. 2020. Oncogenic activation of PI3K-AKT-mTOR signaling suppresses ferroptosis via SREBP-mediated lipogenesis.. Proc Natl Acad Sci U S A 117(49):31189-31197 PMID: 33229547
- 4. Shimano H et al.. 2017. SREBP-regulated lipid metabolism: convergent physiology - divergent pathophysiology.. Nat Rev Endocrinol 13(12):710-730 PMID: 28849786
- 5. Liu S et al.. 2025. Negative regulation of SREBP-1/FAS signaling molecules activates the RIG-1/TBK1-mediated IFN-I pathway to inhibit BVDV replication.. Antiviral Res 233:106054 PMID: 39653278
- 6. Lim SA et al.. 2021. Lipid signalling enforces functional specialization of T(reg) cells in tumours.. Nature 591(7849):306-311 PMID: 33627871
- 7. Romani P et al.. 2019. Extracellular matrix mechanical cues regulate lipid metabolism through Lipin-1 and SREBP.. Nat Cell Biol 21(3):338-347 PMID: 30718857
- 8. Cai J et al.. 2023. Fatostatin induces ferroptosis through inhibition of the AKT/mTORC1/GPX4 signaling pathway in glioblastoma.. Cell Death Dis 14(3):211 PMID: 36966152
