GO:0010507 negative regulation of autophagy: Mechanisms, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0010507 (negative regulation of autophagy) describes any process that stops, prevents, or reduces the frequency, rate, or extent of autophagy, the cellular self-digestion pathway.
• Key negative regulators include UBA6-BIRC6, which ubiquitinates LC3 to block autophagosome formation, and Beclin 1, whose downregulation or sequestration inhibits autophagy initiation.
• Transcriptional repression of autophagy-related genes, such as by Sin3, provides a layer of negative control in fungi and likely higher eukaryotes.
• MTFP1 controls mitochondrial fusion and inner membrane quality control, indirectly influencing autophagic flux and mtDNA maintenance.
• Dysregulation of negative regulation of autophagy is implicated in cancer, neurodegeneration, and cardiac disease, making it a therapeutic target [1,7,8].
• CRISPR-based knockout, point mutation, knock-in, and overexpression models are essential to dissect causal roles of negative regulators in autophagy [3,6].
Description
Autophagy is a conserved catabolic process in which cells digest parts of their own cytoplasm to maintain homeostasis and survive stress. The extent of autophagy must be tightly controlled; negative regulation of autophagy (GO:0010507) encompasses all molecular events that stop, prevent, or reduce autophagy frequency, rate, or extent. This GO term is critical for understanding how cells avoid excessive self-digestion and how pathogens or cancer cells evade autophagic death [1,7]. Research into negative regulation of autophagy has revealed diverse mechanisms, from ubiquitin-proteasome-mediated degradation of core autophagy proteins like LC3 to transcriptional repression of autophagy-related genes. These findings have broad implications for diseases such as cancer, neurodegeneration, and heart failure [1,7,8]. In this article, we synthesize authoritative QuickGO data and verified PubMed literature to provide a research-grade overview of GO:0010507, its key genes, regulatory mechanisms, and experimental models for study.
negative regulation of autophagy At A Glance
| GO ID | GO:0010507 |
|---|---|
| GO term | negative regulation of autophagy |
| Ontology | biological_process |
| Synonym | none |
| Major function | Stops, prevents, or reduces the frequency, rate, or extent of autophagy |
| Definition source | QuickGO |
| Related processes | Autophagy, ubiquitination, transcriptional repression, mitochondrial quality control |
| Key regulators | UBA6, BIRC6, LC3, Beclin 1, Sin3, MTFP1, JMY, TTC5/STRAP, SCAMP3 |
What Is GO:0010507?
According to the Gene Ontology, GO:0010507 (negative regulation of autophagy) is defined as any process that stops, prevents, or reduces the frequency, rate, or extent of autophagy, the process in which cells digest parts of their own cytoplasm. This biological process includes molecular events such as ubiquitination and degradation of autophagy proteins, sequestration of autophagy initiators, and transcriptional downregulation of autophagy-related genes [3,6,8].
Why Is negative regulation of autophagy Important in Cell Biology?
Negative regulation of autophagy is essential for cellular homeostasis because uncontrolled autophagy can lead to excessive degradation of essential cellular components and cell death. Understanding this process provides insights into how cells balance survival and death under stress, and how dysregulation contributes to diseases such as cancer, neurodegeneration, and cardiac disorders [1,7,8]. Moreover, pathogens and tumor cells often exploit negative regulators of autophagy to evade host defense or therapy-induced cell death [1,7]. Therefore, targeting negative regulators of autophagy holds therapeutic potential, and CRISPR-based models are indispensable for dissecting their causal roles [3,6].
• Prevents excessive self-digestion that could be lethal to cells.
• Regulates autophagy initiation by controlling LC3 availability through ubiquitination.
• Modulates autophagic flux in response to mitochondrial stress via MTFP1.
• Transcriptional repression of autophagy genes by Sin3 affects fungal development and pathogenicity.
• Beclin 1 downregulation in the heart contributes to cardiac hypertrophy and heart failure.
• SCAMP3-driven signaling influences autophagy and ERK1/2 pathways in triple-negative breast cancer.
• JMY actin nucleation activity is regulated by TTC5/STRAP and LC3 during autophagy.
• Negative regulation of autophagy is a survival mechanism for cancer cells under metabolic stress [1,7].
• Dysregulation is linked to neurodegeneration, where impaired autophagy leads to protein aggregation.
• CRISPR screens can identify novel negative regulators of autophagy for therapeutic targeting [3,6].
What Happens During negative regulation of autophagy?
Ubiquitin-Proteasome-Mediated Degradation of LC3
In simple terms: Cells tag the autophagy protein LC3 with ubiquitin, marking it for destruction, which blocks autophagy.
The UBA6-BIRC6 ubiquitin ligase complex conjugates ubiquitin to LC3, leading to its proteasomal degradation and thereby reducing autophagosome formation. This represents a direct negative regulation of autophagy at the level of core machinery stability.
Sequestration and Inactivation of Beclin 1
In simple terms: Beclin 1 is a key initiator of autophagy; when it is bound or downregulated, autophagy cannot start.
Beclin 1 (BECN1) is a essential autophagy initiator, and its negative regulation occurs through interaction with inhibitors such as Bcl-2 or through reduced expression, as seen in cardiac hypertrophy. This prevents autophagosome nucleation and reduces autophagic flux.
Transcriptional Repression of Autophagy-Related Genes
In simple terms: Cells can turn down the production of autophagy proteins by repressing their genes.
The transcriptional regulator Sin3 negatively modulates autophagy by repressing the expression of autophagy-related genes in Magnaporthe oryzae, affecting fungal development and pathogenicity. Similar mechanisms may operate in higher eukaryotes to fine-tune autophagy levels.
Mitochondrial Quality Control and MTFP1
In simple terms: A protein called MTFP1 controls mitochondrial fusion and indirectly affects autophagy of mitochondria.
MTFP1 controls mitochondrial fusion to regulate inner membrane quality control and maintain mtDNA levels, which can influence autophagic degradation of mitochondria (mitophagy) and overall autophagy. Loss of MTFP1 leads to mitochondrial dysfunction and altered autophagic responses.
Regulation of Actin Dynamics by JMY, TTC5/STRAP, and LC3
In simple terms: Proteins that control actin filaments also modulate autophagy, linking cytoskeletal dynamics to negative regulation.
JMY's actin nucleation activity is regulated by TTC5/STRAP and LC3 during autophagy, providing a mechanism by which cytoskeletal rearrangements can negatively impact autophagosome formation. This crosstalk fine-tunes autophagy in response to cellular needs.
Key Genes Involved in GO:0010507 negative regulation of autophagy
The following genes and proteins are experimentally validated participants in negative regulation of autophagy (GO:0010507).
| Gene | Major Role | Research Relevance |
|---|---|---|
| UBA6 | Ubiquitin-activating enzyme that partners with BIRC6 to ubiquitinate LC3 | Target for blocking autophagy in cancer |
| BIRC6 | Ubiquitin ligase that mediates LC3 ubiquitination and degradation | Potential therapeutic target to inhibit autophagy |
| LC3 | Core autophagy protein; its degradation reduces autophagosome formation | Biomarker of autophagic flux; ubiquitination site mapping |
| BECN1 (Beclin 1) | Autophagy initiator; negative regulation by sequestration or downregulation | Cardiac hypertrophy and heart failure models |
| Sin3 | Transcriptional repressor of autophagy-related genes | Fungal pathogenicity and development |
| MTFP1 | Mitochondrial inner membrane protein controlling fusion and quality control | Mitochondrial dynamics and mtDNA maintenance |
| JMY | Actin nucleation factor regulated by TTC5/STRAP and LC3 | Cytoskeletal-autophagy crosstalk |
| TTC5/STRAP | Regulator of JMY actin nucleation during autophagy | Autophagy-related cytoskeletal remodeling |
| SCAMP3 | Secretory carrier membrane protein affecting ERK1/2 and autophagy signatures | Triple-negative breast cancer |
| SnRK1 | Plant energy sensor involved in feedback regulation of autophagy | Plant autophagy and stress signaling |
| ERK1/2 | Kinases whose phosphorylation signatures are linked to autophagy regulation | Cancer signaling and autophagy |
| Bcl-2 | Inhibits Beclin 1-dependent autophagy by binding | Cardiac and cancer autophagy regulation |
| mTOR | Central negative regulator of autophagy via ULK1 phosphorylation | Autophagy initiation control |
| ULK1 | Autophagy-initiating kinase inhibited by mTOR | Target for autophagy modulation |
| ATG genes | Autophagy-related genes transcriptionally repressed by Sin3 | Fungal and higher eukaryotic autophagy |
| p62/SQSTM1 | Selective autophagy receptor; its levels reflect autophagic flux | Neurodegeneration and cancer |
| LAMP2 | Lysosomal membrane protein; chaperone-mediated autophagy | Autophagy-lysosome dysfunction |
| TFEB | Transcription factor promoting autophagy; negatively regulated by mTOR | Lysosomal biogenesis and autophagy |
How Is negative regulation of autophagy Regulated?
Negative regulation of autophagy is itself tightly regulated at multiple levels. The mTOR kinase is a master negative regulator that phosphorylates ULK1 to inhibit autophagy initiation. Beclin 1 activity is controlled by Bcl-2 binding and post-translational modifications. Ubiquitination of LC3 by UBA6-BIRC6 provides a direct degradation-based mechanism. Transcriptional repression by Sin3 reduces autophagy gene expression. In plants, SnRK1 signaling feedback regulates autophagy. Additionally, MTFP1 influences mitochondrial quality control, which can indirectly suppress mitophagy. These layers ensure autophagy is activated only when needed.
negative regulation of autophagy and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| BECN1 | Cardiac hypertrophy and heart failure | Cardiomyocyte-specific knockout or overexpression in mice |
| UBA6/BIRC6 | Cancer chemoresistance | CRISPR knockout in cancer cell lines followed by autophagy flux assays |
| SCAMP3 | Triple-negative breast cancer | Knockdown or overexpression in TNBC cell lines with phosphoproteomics |
| Sin3 | Fungal pathogenicity | Gene deletion in Magnaporthe oryzae |
| MTFP1 | Mitochondrial disease and mtDNA depletion | Knockout in mammalian cells with mitochondrial stress |
Cancer
Negative regulation of autophagy can promote tumor survival by preventing excessive self-digestion under metabolic stress. SCAMP3-driven regulation of ERK1/2 and autophagy phosphoproteomics signatures has been observed in triple-negative breast cancer, suggesting that targeting negative regulators could sensitize tumors to therapy. UBA6-BIRC6-mediated LC3 degradation may also contribute to chemoresistance.
Cardiovascular Disease
In the heart, Beclin 1 downregulation is associated with cardiac hypertrophy and heart failure, indicating that negative regulation of autophagy contributes to disease progression. Modulating Beclin 1 activity or its inhibitors may offer therapeutic strategies.
Neurodegeneration
Impaired autophagy leads to accumulation of protein aggregates in neurons; thus, excessive negative regulation of autophagy may exacerbate neurodegeneration. Understanding how negative regulators like mTOR or Bcl-2 are dysregulated could reveal new targets.
Infectious Disease
Pathogens such as Magnaporthe oryzae exploit transcriptional repression of autophagy genes via Sin3 to modulate their development and pathogenicity. This highlights how negative regulation of autophagy can be subverted by microbes.
From negative regulation of autophagy-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does UBA6-BIRC6 directly ubiquitinate LC3 in vivo? | Knockout of UBA6 or BIRC6 in cell lines, followed by LC3 immunoprecipitation and ubiquitination assays |
| What is the role of Beclin 1 downregulation in heart failure? | Cardiac-specific Beclin 1 knockout or transgenic overexpression in mice |
| How does Sin3 repress autophagy genes? | Sin3 deletion in Magnaporthe oryzae with RNA-seq and ChIP-seq |
| Does MTFP1 regulate mitophagy? | MTFP1 knockout cells with mitochondrial stress and autophagic flux measurements |
| Can SCAMP3 be targeted to modulate autophagy in TNBC? | SCAMP3 knockout or overexpression in triple-negative breast cancer cell lines |
| What is the impact of JMY actin nucleation on autophagy? | JMY point mutations affecting actin binding in combination with LC3 reporters |
How to Study the negative regulation of autophagy Process
| Method | What It Measures | Typical Application |
|---|---|---|
| LC3 flux assay | Autophagosome formation and degradation | Assessing negative regulation of autophagy |
| Ubiquitination assay | Covalent attachment of ubiquitin to target proteins | Confirming UBA6-BIRC6-mediated LC3 degradation |
| RNA-seq | Transcriptional changes in autophagy genes | Identifying Sin3-repressed genes |
| ChIP-seq | Transcription factor binding to autophagy gene promoters | Mapping Sin3 binding sites |
| Phosphoproteomics | Global phosphorylation changes | SCAMP3-driven signaling in TNBC |
| Mitochondrial function assays | mtDNA levels, fusion/fission dynamics | MTFP1 regulation of mitochondrial quality control |
| Cardiac hypertrophy models | Heart size and function | Beclin 1 regulation in heart failure |
| CRISPR screens | Identification of negative regulators of autophagy | Functional genomics of autophagy [3,6] |
Autophagic Flux Assays
LC3-II turnover, measured by western blot in the presence and absence of lysosomal inhibitors, is the gold standard for assessing autophagic flux. This method can determine whether a negative regulator reduces autophagosome formation or degradation.
Ubiquitination and Proteasomal Degradation Assays
In vitro ubiquitination assays and proteasome inhibition can reveal direct ubiquitination of autophagy proteins like LC3 by UBA6-BIRC6. These techniques confirm negative regulation at the post-translational level.
Transcriptional Profiling
RNA-seq and ChIP-seq can identify transcriptional repression of autophagy-related genes by factors such as Sin3. This approach is useful for discovering novel negative regulators at the transcriptional level.
Phosphoproteomics
Phosphoproteomic profiling of ERK1/2 and autophagy-related proteins can uncover signaling signatures driven by SCAMP3 in cancer. This high-throughput method identifies phosphorylation events that negatively regulate autophagy.
How CRISPR Can Be Used to Study GO:0010507 negative regulation of autophagy
Knockout
CRISPR knockout of negative regulators such as UBA6, BIRC6, or Sin3 can lead to increased autophagy, confirming their inhibitory roles [3,6]. Knockout cell lines are valuable for studying autophagic flux and downstream phenotypes.
Point Mutation
Introducing point mutations in LC3 ubiquitination sites or Beclin 1 phosphorylation sites can dissect the precise molecular mechanisms of negative regulation [3,8]. These models help distinguish between different regulatory inputs.
Knock-in
Knock-in of tagged versions of LC3 or Beclin 1 (e.g., GFP-LC3) allows real-time monitoring of autophagy and its negative regulation in live cells. Tagged knock-in models are essential for imaging and biochemical studies.
Overexpression
Overexpression of negative regulators like BIRC6 or Sin3 can suppress autophagy and mimic disease states, such as cancer chemoresistance [3,6]. These models are useful for testing inhibitors of negative regulation.
How EDITGENE Supports negative regulation of autophagy Research
Researchers studying negative regulation of autophagy-related genes often need to determine whether a candidate gene is causally involved in suppressing autophagy or is merely correlated. EDITGENE provides comprehensive CRISPR services to generate precisely engineered cell models for such functional studies.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of autophagy research.
Frequently Asked Questions About negative regulation of autophagy
What is negative regulation of autophagy (GO:0010507)?
It is any process that stops, prevents, or reduces the frequency, rate, or extent of autophagy, the cellular self-digestion pathway.
What genes are involved in negative regulation of autophagy?
Key genes include UBA6, BIRC6, LC3, BECN1, Sin3, MTFP1, JMY, TTC5/STRAP, and SCAMP3 [2,3,5,6,7,8].
How does UBA6-BIRC6 negatively regulate autophagy?
UBA6-BIRC6 ubiquitinates LC3, marking it for proteasomal degradation, which reduces autophagosome formation.
What is the role of Beclin 1 in negative regulation of autophagy?
Beclin 1 is an autophagy initiator; its downregulation or sequestration by inhibitors like Bcl-2 negatively regulates autophagy, as seen in heart failure.
How is autophagy negatively regulated at the transcriptional level?
Transcription factors such as Sin3 repress the expression of autophagy-related genes, reducing autophagic capacity.
What is the link between MTFP1 and autophagy?
MTFP1 controls mitochondrial fusion and quality control, indirectly influencing mitophagy and mtDNA maintenance.
Can CRISPR be used to study negative regulation of autophagy?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are widely used to dissect gene function in autophagy [3,6,8].
What diseases are associated with dysregulated negative regulation of autophagy?
Cancer, cardiovascular disease, neurodegeneration, and infectious diseases have been linked to altered negative regulation of autophagy [1,6,7,8].
How does SCAMP3 affect autophagy in cancer?
SCAMP3-driven regulation of ERK1/2 and autophagy phosphoproteomics signatures has been observed in triple-negative breast cancer.
What methods are used to measure negative regulation of autophagy?
LC3 flux assays, ubiquitination assays, RNA-seq, ChIP-seq, and phosphoproteomics are commonly used [1,3,6,7].
Conclusion
Negative regulation of autophagy (GO:0010507) is a critical biological process that prevents excessive self-digestion and maintains cellular homeostasis. Key mechanisms include ubiquitin-proteasome-mediated degradation of LC3, sequestration of Beclin 1, transcriptional repression of autophagy genes, and mitochondrial quality control [1,2,3,6,8]. Dysregulation of these pathways contributes to cancer, heart failure, neurodegeneration, and infectious diseases [1,6,7,8]. CRISPR-based models are indispensable for dissecting causal roles and identifying therapeutic targets. EDITGENE provides comprehensive services to support such research, from knockout to overexpression and library screening.
References
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- 3. Jia R et al.. 2019. Negative regulation of autophagy by UBA6-BIRC6-mediated ubiquitination of LC3.. Elife 8 PMID: 31692446
- 4. Yang C et al.. 2023. Autophagy contributes to positive feedback regulation of SnRK1 signaling in plants.. Autophagy 19(12):3248-3250 PMID: 37584544
- 5. Liu X et al.. 2019. Regulation of JMY's actin nucleation activity by TTC5/STRAP and LC3 during autophagy.. Autophagy 15(3):373-374 PMID: 30593260
- 6. Wu Z et al.. 2023. Transcriptional Regulation of Autophagy-Related Genes by Sin3 Negatively Modulates Autophagy in Magnaporthe oryzae.. Microbiol Spectr 11(3):e0017123 PMID: 37191531
- 7. Morales-Cabán BM et al.. 2025. SCAMP3-Driven Regulation of ERK1/2 and Autophagy Phosphoproteomics Signatures in Triple-Negative Breast Cancer.. Int J Mol Sci 26(19) PMID: 41096842
- 8. Maejima Y et al.. 2016. Regulation of autophagy by Beclin 1 in the heart.. J Mol Cell Cardiol 95:19-25 PMID: 26546165
