GO:0016242 negative regulation of macroautophagy: Autophagy Control Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0016242 (negative regulation of macroautophagy) describes any biological process that stops, prevents, or reduces the frequency, rate, or extent of macroautophagy, the major lysosomal degradation pathway for cytoplasmic cargo.
• This term is a biological_process branch of the Gene Ontology and is distinct from positive regulation of macroautophagy and from chaperone-mediated autophagy.
• Core negative regulators include MTORC1, MTORC2, and multiple ubiquitin-proteasome components that destabilize ATG proteins such as ATG5 and ATG4B.
• Dysregulated negative regulation of macroautophagy contributes to cancer progression, chemotherapy resistance, bone metabolism disorders, and viral immune evasion.
• CRISPR knockout, point-mutation, knock-in, and overexpression models are essential to dissect whether a candidate gene causally inhibits macroautophagy.
• EDITGENE provides end-to-end CRISPR cell model and library screening services to study negative regulation of macroautophagy at scale.
Description
Macroautophagy is a conserved catabolic process in which cytoplasmic components are sequestered into double-membrane autophagosomes and delivered to lysosomes for degradation. Because unrestrained macroautophagy can be lethal or metabolically maladaptive, cells deploy multiple layers of negative regulation to keep this pathway in check. The Gene Ontology term GO:0016242, negative regulation of macroautophagy, captures any process that stops, prevents, or reduces the frequency, rate, or extent of macroautophagy. This term is essential for annotating gene products that act as brakes on autophagosome formation, maturation, or cargo selection. Researchers study negative regulation of macroautophagy because it is a central node in cancer, neurodegeneration, immunity, and metabolism. For example, MTORC1 and MTORC2 signaling suppresses macroautophagy under nutrient-rich conditions, while ubiquitin ligases such as UBE3C and HACE1 target core autophagy proteins for degradation. Viral proteins can also hijack negative regulation to evade host immunity. Understanding these mechanisms requires precise genetic models and quantitative assays. This article integrates the QuickGO definition of GO:0016242 with verified PubMed literature to provide a research-grade overview of its mechanism, key genes, disease relevance, and experimental methods. It is designed for scientists, bioinformaticians, and AI retrieval systems seeking authoritative, citable content on negative regulation of macroautophagy.
negative regulation of macroautophagy At A Glance
| GO ID | GO:0016242 |
|---|---|
| GO term | negative regulation of macroautophagy |
| Ontology | biological_process |
| Definition | Any process that stops, prevents, or reduces the frequency, rate or extent of macroautophagy. |
| Synonym | down regulation of macroautophagy; down-regulation of macroautophagy; downregulation of macroautophagy; inhibition of macroautophagy; negative regulation of starvation-induced autophagy |
| Major function | Suppression of autophagosome formation, maturation, and cargo degradation to maintain cellular homeostasis. |
| Related processes | MTORC1 signaling, MTORC2 signaling, ubiquitin-proteasome degradation of ATG proteins, viral immune evasion. |
| Key negative regulators | MTORC1, MTORC2, UBE3C, HACE1, HMBOX1, NSD2/WHSC1, PIK3C3 (context-dependent). |
| Disease relevance | Cancer chemoresistance, metastasis, bone metabolism disorders, viral infection, fibroblast senescence. |
What Is GO:0016242?
GO:0016242 (negative regulation of macroautophagy) is defined by QuickGO as any process that stops, prevents, or reduces the frequency, rate, or extent of macroautophagy. In practice, this includes molecular events that inhibit autophagosome nucleation, elongation, cargo recognition, or fusion with lysosomes, as well as signaling cascades that transcriptionally or post-translationally suppress core autophagy (ATG) genes. It is a biological_process term and should not be confused with negative regulation of chaperone-mediated autophagy, which is a distinct selective autophagy pathway.
Why Is negative regulation of macroautophagy Important in Cell Biology?
Negative regulation of macroautophagy is critical because macroautophagy must be tightly controlled to balance nutrient recycling with cell survival and death. Excessive or insufficient autophagy contributes to cancer, neurodegeneration, metabolic disorders, and immune dysfunction. The GO term GO:0016242 enables systematic annotation of genes that restrain this pathway, supporting drug target discovery and mechanistic studies.
• Prevents excessive self-digestion that can lead to cell death or atrophy.
• Controls chemotherapy resistance in colorectal cancer through HMBOX1-mediated ATG5 degradation.
• Regulates triple-negative breast cancer metastasis via NSD2/WHSC1-dependent ULK1 activation.
• Modulates bone metabolism and osteoclast/osteoblast function.
• Enables viral immune evasion, as shown for foot-and-mouth disease virus VP1 degrading YTHDF2.
• Drives fibroblast senescence through MTORC2 regulation.
• Provides targets for autophagy-modulating therapeutics in oncology.
• Serves as a functional annotation node for CRISPR screens and bioinformatics pipelines.
• Helps distinguish selective autophagy subtypes from bulk macroautophagy.
• Supports precision medicine by linking genotype to autophagy flux phenotypes.
What Happens During negative regulation of macroautophagy?
Initiation checkpoint: MTORC1 and MTORC2 suppression
In simple terms: When nutrients are plentiful, mTOR kinases act like brakes on autophagy.
MTORC1 phosphorylates ULK1 and ATG13 to inhibit the ULK complex, blocking autophagosome initiation. MTORC2 also contributes to negative regulation, as shown in fibroblasts where MTORC2 signaling drives senescence-associated autophagy suppression. These phosphorylation events are reversible and nutrient-sensitive, making them central to GO:0016242.
Ubiquitin-proteasome degradation of ATG proteins
In simple terms: Tagging autophagy proteins with ubiquitin sends them to the proteasome for destruction.
UBE3C ubiquitinates ATG4B, promoting its degradation and thereby reducing autophagosome formation. HACE1, induced by HMBOX1, ubiquitinates ATG5 for degradation, reversing 5-fluorouracil resistance in colorectal cancer. These post-translational events are direct mechanisms of negative regulation of macroautophagy.
Transcriptional and epigenetic control
In simple terms: Cells can turn down autophagy genes by changing chromatin marks.
The H3K36me2 methyltransferase NSD2/WHSC1 promotes ULK1-dependent autophagy activation in triple-negative breast cancer, but context-dependent epigenetic regulation can also suppress autophagy gene expression. Such transcriptional layers feed into GO:0016242 by limiting ATG gene availability.
Viral hijacking of negative regulation
In simple terms: Some viruses force cells to degrade antiviral proteins via autophagy brakes.
Foot-and-mouth disease virus VP1 degrades YTHDF2 through autophagy to regulate IRF3 activity and enhance viral replication. This illustrates how pathogens exploit negative regulation of macroautophagy to evade immunity.
Crosstalk with chaperone-mediated autophagy
In simple terms: Different autophagy types can compensate for each other.
Chaperone-mediated autophagy is a distinct pathway, but its regulatory machinery can intersect with macroautophagy control. Understanding these boundaries is essential for accurate GO:0016242 annotation.
Key Genes Involved in GO:0016242 negative regulation of macroautophagy
The following genes and proteins are experimentally validated participants in negative regulation of macroautophagy (GO:0016242) based on the cited literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| MTOR | Kinase that phosphorylates ULK1/ATG13 to inhibit autophagy initiation | Central negative regulator; target for autophagy-modulating drugs |
| RICTOR | Component of MTORC2; modulates autophagy and senescence | Studied in fibroblast senescence models |
| UBE3C | E3 ubiquitin ligase that ubiquitinates ATG4B for degradation | Controls autophagosome formation via ATG4B turnover |
| HACE1 | E3 ubiquitin ligase that ubiquitinates ATG5 | Mediates HMBOX1-induced autophagy suppression in colorectal cancer |
| HMBOX1 | Transcription factor that promotes HACE1 expression | Reverses 5-FU resistance by degrading ATG5 |
| ATG5 | Core autophagy protein; ubiquitination target | Degradation by HACE1 inhibits macroautophagy |
| ATG4B | Cysteine protease required for LC3 lipidation; UBE3C substrate | Ubiquitination by UBE3C reduces autophagy |
| NSD2/WHSC1 | H3K36me2 methyltransferase; activates ULK1-dependent autophagy | Promotes triple-negative breast cancer metastasis |
| ULK1 | Initiation kinase; phosphorylated by MTORC1 | Key node for negative regulation by MTORC1 |
| PIK3C3 | Class III PI3K; context-dependent autophagy regulator | Controls Sertoli cell polarity via SCIN regulation |
| SCIN | Scinderin; actin-binding protein regulated by PIK3C3 | Links autophagy regulation to cell polarity |
| YTHDF2 | m6A reader; degraded by FMDV VP1 via autophagy | Viral immune evasion mechanism |
| IRF3 | Transcription factor for antiviral immunity | Regulated by YTHDF2 degradation |
| MAP1LC3B | Autophagosome marker; lipidation target | Readout of autophagy flux |
| SQSTM1/p62 | Selective autophagy receptor | Marker of autophagic degradation |
| BECN1 | Beclin-1; PI3K complex component | Core autophagy regulator |
| ATG13 | ULK complex subunit; MTORC1 substrate | Phosphorylation inhibits autophagy |
| ATG16L1 | Autophagosome elongation factor | Functional readout in knockout studies |
How Is negative regulation of macroautophagy Regulated?
Negative regulation of macroautophagy is controlled by nutrient-sensing kinases, ubiquitin-proteasome degradation, and epigenetic modifiers. MTORC1 phosphorylates ULK1 and ATG13 to suppress initiation under nutrient-rich conditions. MTORC2 signaling also modulates autophagy and senescence. Ubiquitin ligases UBE3C and HACE1 target ATG4B and ATG5 for degradation, providing post-translational brakes. Epigenetic factors such as NSD2/WHSC1 influence ULK1-dependent autophagy in cancer. Viral proteins can hijack these pathways to evade immunity.
negative regulation of macroautophagy and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| HMBOX1 | Colorectal cancer chemoresistance | HCT116 knockout and overexpression |
| NSD2/WHSC1 | Triple-negative breast cancer metastasis | MDA-MB-231 knockout and knock-in |
| UBE3C | Autophagy regulation in cancer | HeLa ATG4B mutant knock-in |
| MTOR | Bone metabolism disorders | Osteoclast-specific knockout |
| YTHDF2 | Viral immune evasion | FMDV infection in IRF3 reporter cells |
Cancer chemoresistance and metastasis
HMBOX1 reverses 5-fluorouracil resistance by promoting HACE1-induced ubiquitination and degradation of ATG5 in colorectal cancer. NSD2/WHSC1 promotes triple-negative breast cancer metastasis via activation of ULK1-dependent autophagy. These findings link negative regulation of macroautophagy to chemotherapy response and metastatic potential.
Bone metabolism disorders
Autophagy plays a critical role in bone metabolism, and its negative regulation affects osteoclast and osteoblast function. Dysregulated autophagy control is implicated in osteoporosis and related disorders.
Viral infection and immune evasion
Foot-and-mouth disease virus VP1 degrades YTHDF2 through autophagy to regulate IRF3 activity, enhancing viral replication. This demonstrates how negative regulation of macroautophagy can be exploited by pathogens.
Fibroblast senescence and aging
Autophagy drives fibroblast senescence through MTORC2 regulation, and negative regulation of macroautophagy modulates this process. This connects GO:0016242 to aging and tissue homeostasis.
From negative regulation of macroautophagy-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X inhibit macroautophagy? | CRISPR knockout with LC3B flux assay |
| Does a point mutation in ATG4B affect UBE3C-mediated degradation? | Point-mutation knock-in |
| Does HMBOX1 overexpression reverse 5-FU resistance? | Overexpression in colorectal cancer cells |
| Does NSD2/WHSC1 promote metastasis via ULK1? | Knock-in of methyltransferase-dead mutant |
| Does MTORC2 regulate fibroblast senescence? | RICTOR knockout fibroblasts |
| Does viral VP1 degrade YTHDF2? | Tagged knock-in of YTHDF2 |
How to Study the negative regulation of macroautophagy Process
| Method | What It Measures | Typical Application |
|---|---|---|
| LC3B flux assay | Autophagosome formation and degradation | Knockout validation |
| Ubiquitination assay | Post-translational modification of ATG proteins | UBE3C-ATG4B interaction |
| Cycloheximide chase | Protein stability | HACE1-ATG5 degradation |
| CRISPR knockout screen | Gene requirement for autophagy suppression | Novel regulator discovery |
| RNA-seq | Transcriptional changes in ATG genes | NSD2/WHSC1 target analysis |
| Proteomics | Protein interaction networks | MTORC2 signaling |
| Fluorescence microscopy | Autophagosome puncta and polarity | PIK3C3-SCIN axis |
| Viral infection assay | Immune evasion and replication | FMDV VP1-YTHDF2 |
Autophagy flux assays
LC3B lipidation and SQSTM1/p62 turnover are standard readouts for macroautophagy flux. These assays distinguish negative regulation from general autophagy inhibition.
Ubiquitination and proteasome degradation assays
In vivo ubiquitination and cycloheximide chase assays confirm UBE3C-ATG4B and HACE1-ATG5 interactions. These methods directly test post-translational negative regulation.
CRISPR screening and bioinformatics
Genome-wide CRISPR knockout screens identify negative regulators of macroautophagy. Bioinformatics pipelines annotate hits to GO:0016242 and related terms.
Imaging and polarity assays
PIK3C3 regulation of SCIN affects Sertoli cell polarity, requiring imaging-based assays. Fluorescence microscopy of autophagosomes and polarity markers is essential.
How CRISPR Can Be Used to Study GO:0016242 negative regulation of macroautophagy
Knockout
CRISPR knockout of candidate negative regulators such as UBE3C or HACE1 increases macroautophagy flux, confirming their role in GO:0016242. Knockout models are essential for loss-of-function studies.
Point Mutation
Point mutations in ATG4B or ATG5 can block ubiquitination sites, preventing negative regulation and stabilizing the proteins. These models dissect specific post-translational mechanisms.
Knock-in
Knock-in of tagged ATG proteins or mutant MTOR substrates enables precise tracking of autophagy dynamics. Tagged knock-in of YTHDF2 allows monitoring viral degradation.
Overexpression
Overexpression of HMBOX1 or NSD2/WHSC1 enhances negative regulation of macroautophagy and promotes cancer phenotypes. Overexpression models test gain-of-function effects.
How EDITGENE Supports negative regulation of macroautophagy Research
Researchers studying negative regulation of macroautophagy-related genes often need to determine whether a candidate gene is causally involved in suppressing autophagy or is merely correlated with flux changes. EDITGENE provides validated CRISPR cell models and screening services to answer these questions with rigor.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of macroautophagy research.
Frequently Asked Questions About negative regulation of macroautophagy
What is negative regulation of macroautophagy?
It is any process that stops, prevents, or reduces the frequency, rate, or extent of macroautophagy, as defined by GO:0016242.
What genes are involved in negative regulation of macroautophagy?
Key genes include MTOR, RICTOR, UBE3C, HACE1, HMBOX1, NSD2/WHSC1, and ATG5.
How does MTOR inhibit macroautophagy?
MTORC1 phosphorylates ULK1 and ATG13 to block autophagosome initiation.
What is the role of UBE3C in autophagy?
UBE3C ubiquitinates ATG4B, promoting its degradation and reducing autophagosome formation.
How does HMBOX1 affect chemotherapy resistance?
HMBOX1 promotes HACE1-induced ubiquitination and degradation of ATG5, reversing 5-fluorouracil resistance in colorectal cancer.
Can viruses manipulate negative regulation of macroautophagy?
Yes, foot-and-mouth disease virus VP1 degrades YTHDF2 through autophagy to regulate IRF3 and enhance replication.
What is the difference between macroautophagy and chaperone-mediated autophagy?
Macroautophagy uses autophagosomes for bulk degradation, while chaperone-mediated autophagy selectively targets proteins to lysosomes.
How is negative regulation of macroautophagy studied?
Common methods include LC3B flux assays, ubiquitination assays, CRISPR screens, and RNA-seq.
What diseases are linked to negative regulation of macroautophagy?
Cancer chemoresistance, metastasis, bone metabolism disorders, viral infection, and fibroblast senescence.
What CRISPR models are used for GO:0016242 research?
Knockout, point-mutation, knock-in, and overexpression models are used to test causal roles of candidate genes.
Conclusion
GO:0016242 (negative regulation of macroautophagy) is a critical biological process that restrains macroautophagy to maintain cellular homeostasis. Its mechanisms involve MTOR signaling, ubiquitin-proteasome degradation of ATG proteins, and epigenetic control. Dysregulation of this process contributes to cancer, bone disorders, viral infection, and aging. CRISPR-based models and bioinformatics are essential for dissecting these pathways and identifying therapeutic targets.
References
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- 2. Gao Y et al.. 2025. HMBOX1 reverses autophagy mediated 5-fluorouracil resistance through promoting HACE1-induced ubiquitination and degradation of ATG5 in colorectal cancer.. Autophagy 21(7):1556-1577 PMID: 40126194
- 3. Yao R et al.. 2023. Chaperone-mediated autophagy: Molecular mechanisms, biological functions, and diseases.. MedComm (2020) 4(5):e347 PMID: 37655052
- 4. Liu H et al.. 2024. Foot-and-mouth disease virus VP1 degrades YTHDF2 through autophagy to regulate IRF3 activity for viral replication.. Autophagy 20(7):1597-1615 PMID: 38516932
- 5. Wang J et al.. 2023. The role of autophagy in bone metabolism and clinical significance.. Autophagy 19(9):2409-2427 PMID: 36858962
- 6. Sun C et al.. 2024. UBE3C tunes autophagy via ATG4B ubiquitination.. Autophagy 20(3):645-658 PMID: 38146933
- 7. Bernard M et al.. 2020. Autophagy drives fibroblast senescence through MTORC2 regulation.. Autophagy 16(11):2004-2016 PMID: 31931659
- 8. Chen D et al.. 2025. H3K36me2 methyltransferase NSD2/WHSC1 promotes triple-negative breast cancer metastasis via activation of ULK1-dependent autophagy.. Autophagy 21(8):1824-1842 PMID: 40097917
