GO:2000785 regulation of autophagosome assembly: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:2000785 (regulation of autophagosome assembly) is a biological process term that describes any process modulating the frequency, rate or extent of autophagosome assembly.
• Autophagosome assembly is controlled by post-translational modifications including acetylation, S-acylation and phosphorylation, which determine the fate of core autophagy proteins [1,5].
• Key regulators include ATG proteins, p62/SQSTM1, HDAC6, PLD1 and WSTF, which coordinate cargo recognition, membrane remodeling and autophagosome formation [3,4,5,6].
• Dysregulation of autophagosome assembly is linked to neurodegeneration, cancer, inflammation and oocyte quality, making it a therapeutic target [2,3,4].
• CRISPR knockout, point-mutation, knock-in and overexpression models are essential to dissect causal roles of specific residues and domains in autophagy regulation [1,5].
• Studying GO:2000785 requires integrated methods such as live-cell imaging, proteomics, and CRISPR library screening to capture dynamic assembly steps [2,6].
Description
Autophagosome assembly is a central step in macroautophagy, the process by which cells sequester cytoplasmic material into double-membrane vesicles for lysosomal degradation. The Gene Ontology term GO:2000785, regulation of autophagosome assembly, encompasses any process that modulates the frequency, rate or extent of this assembly. This regulatory layer is critical because the timing and location of autophagosome formation must be tightly controlled to match cellular demands. Research has shown that acetylation of autophagy-related proteins directly influences autophagosome assembly and maturation. Moreover, S-acylation of p62 promotes its recruitment into autophagosomes, linking cargo selection to assembly regulation. These findings highlight that regulation of autophagosome assembly is not a single switch but a network of post-translational modifications and protein-protein interactions. Understanding GO:2000785 is therefore essential for researchers studying autophagy in development, immunity and disease. The term is also relevant to specialized contexts such as oocyte meiosis, where PLD1 regulates autophagy to promote spindle assembly and migration. In addition, ATG14 has been implicated in autophagosome-lysosome fusion, a step downstream of assembly but tightly coordinated with it. This article synthesizes current knowledge on the mechanisms, genes and experimental models used to study regulation of autophagosome assembly, providing a resource for biomedical researchers.
regulation of autophagosome assembly At A Glance
| GO ID | GO:2000785 |
|---|---|
| GO term | regulation of autophagosome assembly |
| Ontology | biological_process |
| Synonym | regulation of autophagic vacuole assembly; regulation of autophagic vacuole formation; regulation of autophagosome biosynthesis; regulation of autophagosome formation; regulation of PAS formation |
| Major function | Modulates the frequency, rate or extent of autophagosome assembly |
| Related cellular component | Autophagosome, phagophore, PAS |
| Related molecular functions | Protein binding, acetyltransferase activity, deacetylase activity, phospholipase activity |
| Associated genes | ATG14, p62/SQSTM1, HDAC6, PLD1, WSTF, ATG proteins |
| Disease relevance | Neurodegeneration, cancer, inflammation, oocyte quality |
What Is GO:2000785?
GO:2000785, regulation of autophagosome assembly, is defined as any process that modulates the frequency, rate or extent of autophagosome assembly. In other words, it includes all molecular events that control when, where and how quickly the double-membrane autophagosome is built. This regulation can occur through post-translational modifications of core autophagy proteins, changes in lipid composition, or interactions with signaling pathways. The term is a biological process and is distinct from the assembly itself, focusing on the regulatory inputs. Synonyms include regulation of autophagic vacuole assembly, regulation of autophagic vacuole formation, regulation of autophagosome biosynthesis, regulation of autophagosome formation, and regulation of PAS formation.
Why Is regulation of autophagosome assembly Important in Cell Biology?
Regulation of autophagosome assembly is fundamental to cellular homeostasis because it determines the efficiency of autophagy, a process that clears damaged proteins and organelles. Dysregulation of this step contributes to a wide range of pathologies, including neurodegenerative diseases, cancer and chronic inflammation [3,4]. For example, HDAC6 mediates an aggresome-like mechanism for inflammasome activation, linking autophagosome regulation to innate immunity. In oocytes, PLD1 regulates autophagy to support spindle assembly and migration, affecting reproductive success. Thus, understanding GO:2000785 provides insights into basic cell biology and identifies potential therapeutic targets.
• Controls the rate of autophagosome formation, impacting cellular clearance of damaged proteins and organelles.
• Influences inflammasome activation and chronic inflammation through HDAC6 and WSTF [3,4].
• Affects oocyte meiosis and spindle assembly via PLD1-mediated autophagy regulation.
• Modulates cilia function and assembly, linking autophagy to ciliopathies.
• Plays a role in protein aggregation diseases, as mouse oocytes sequester aggregated proteins in degradative super-organelles.
• Regulates p62 droplet recruitment into autophagosomes via S-acylation, affecting cargo selection.
• Coordinates with autophagosome-lysosome fusion through ATG14, ensuring efficient degradation.
• Serves as a target for therapeutic intervention in cancer and neurodegeneration [1,3].
• Provides a mechanistic basis for understanding how cells adapt to stress.
• Enables researchers to dissect autophagy at the regulatory level using CRISPR models.
What Happens During regulation of autophagosome assembly?
Initiation and phagophore nucleation
In simple terms: The cell decides where and when to start building the autophagosome.
Regulation of autophagosome assembly begins with signals that trigger the formation of the phagophore, a precursor membrane. Acetylation of autophagy-related proteins can modulate this early step, as reviewed by Xu et al.. For instance, deacetylation of ATG proteins may promote their activity, while acetylation can inhibit assembly. This balance is crucial for responding to nutrient stress and other cues. The recruitment of ATG14 to the phagophore is also a key regulatory event that couples assembly to downstream fusion.
Cargo recognition and p62 droplet formation
In simple terms: The cell tags specific cargo for degradation and packages it for the autophagosome.
S-acylation of p62 promotes its droplet recruitment into autophagosomes, a regulatory step that ensures selective cargo uptake. This modification allows p62 to form condensates that are recognized by the autophagic machinery. Dysregulation of this process can lead to accumulation of toxic protein aggregates, as seen in neurodegenerative models. Thus, regulation of autophagosome assembly includes the spatial and temporal control of cargo receptors.
Membrane remodeling and autophagosome closure
In simple terms: The membrane expands and seals to form a complete autophagosome.
PLD1 regulates autophagy to promote spindle assembly and migration in mouse oocyte meiosis, indicating that phospholipid signaling is a key regulatory input for autophagosome assembly. PLD1 generates phosphatidic acid, which can recruit effector proteins to the forming autophagosome. This step is also influenced by HDAC6, which mediates an aggresome-like mechanism for inflammasome activation, linking membrane remodeling to immune signaling.
Coordination with lysosomal fusion
In simple terms: The autophagosome must fuse with the lysosome to degrade its contents.
ATG14 plays an unsuspected role in autophagosome-lysosome fusion, a step that is tightly coordinated with assembly. Regulation of assembly ensures that only properly formed autophagosomes proceed to fusion. This coordination prevents premature or excessive degradation. WSTF nuclear autophagy regulates chronic but not acute inflammation, highlighting context-dependent regulation.
Key Genes Involved in GO:2000785 regulation of autophagosome assembly
The following genes and proteins are central to the regulation of autophagosome assembly, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ATG14 | Autophagosome-lysosome fusion; couples assembly to degradation | Studied for its role in fusion and assembly coordination |
| p62/SQSTM1 | Cargo receptor; S-acylation promotes droplet recruitment | Key for selective autophagy and aggregate clearance |
| HDAC6 | Deacetylase; mediates aggresome-like mechanism for inflammasome activation | Links autophagy regulation to inflammation |
| PLD1 | Phospholipase D1; regulates autophagy in oocyte meiosis | Affects spindle assembly and migration |
| WSTF | Nuclear autophagy regulator; modulates chronic inflammation | Context-dependent regulation of autophagy |
| ATG proteins | Core machinery for autophagosome formation | Acetylation regulates their activity |
| LC3 | Autophagosome marker; lipidation required for assembly | Used to monitor autophagosome formation |
| Beclin-1 | Part of PI3K complex; initiates phagophore formation | Regulated by acetylation and other modifications |
| ULK1 | Kinase; initiates autophagy in response to stress | Phosphorylation target in regulation |
| VPS34 | PI3K; generates PI3P for phagophore nucleation | Essential for autophagosome assembly |
| ATG5 | Conjugation system; required for LC3 lipidation | Acetylation affects its function |
| ATG7 | E1-like enzyme; activates ATG12 and LC3 | Regulated by acetylation |
| ATG12 | Conjugated to ATG5; part of E3-like complex | Modification status affects assembly |
| ATG16L1 | Part of conjugation complex; localizes to phagophore | Regulated by phosphorylation |
| SQSTM1 | Same as p62; cargo receptor | S-acylation regulates its function |
| NLRP3 | Inflammasome sensor; linked to HDAC6-mediated autophagy | Studied in inflammation |
| Pyrin | Inflammasome sensor; aggresome-like mechanism | Linked to HDAC6 |
| ATG9 | Transmembrane protein; delivers membranes to phagophore | Regulated by trafficking |
How Is regulation of autophagosome assembly Regulated?
Regulation of autophagosome assembly is controlled by multiple signaling pathways and post-translational modifications. Acetylation and deacetylation of core autophagy proteins, such as ATG5, ATG7 and LC3, directly impact assembly efficiency. HDAC6, a cytoplasmic deacetylase, mediates an aggresome-like mechanism for NLRP3 and pyrin inflammasome activation, linking autophagy regulation to innate immunity. S-acylation of p62 is another critical modification that promotes its recruitment into autophagosomes. In oocytes, PLD1 regulates autophagy to support spindle assembly and migration, indicating a role for phospholipid signaling. WSTF nuclear autophagy regulates chronic but not acute inflammation, showing context-specific regulation. Additionally, ATG14 is involved in autophagosome-lysosome fusion, which is coordinated with assembly. These layers of regulation ensure that autophagosome assembly is responsive to cellular needs.
regulation of autophagosome assembly and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| p62/SQSTM1 | Neurodegeneration; protein aggregation | Knockout or S-acylation point mutant in neuronal cells |
| HDAC6 | Inflammation; inflammasome activation | Knockout or deacetylase-dead knock-in in macrophages |
| PLD1 | Oocyte meiosis; infertility | Oocyte-specific knockout or overexpression |
| WSTF | Chronic inflammation | Knockout or tagged knock-in in immune cells |
| ATG14 | Autophagy-related diseases; cancer | Knockout or point mutation in cancer cell lines |
Neurodegeneration and protein aggregation
Defects in regulation of autophagosome assembly contribute to the accumulation of toxic protein aggregates, a hallmark of neurodegenerative diseases. Mouse oocytes sequester aggregated proteins in degradative super-organelles, a process that depends on proper autophagosome assembly. S-acylation of p62 promotes the clearance of such aggregates; when this modification is impaired, aggregates persist and may cause neuronal death. Thus, targeting regulators of autophagosome assembly could enhance aggregate clearance in diseases like Alzheimer's and Parkinson's.
Inflammation and innate immunity
HDAC6 mediates an aggresome-like mechanism for NLRP3 and pyrin inflammasome activation, directly linking regulation of autophagosome assembly to inflammatory responses. WSTF nuclear autophagy regulates chronic but not acute inflammation, suggesting that autophagy regulators can fine-tune immune signaling. Dysregulation of these pathways may lead to chronic inflammatory diseases. Therefore, modulating autophagosome assembly could be a therapeutic strategy for inflammatory conditions.
Cancer and cell survival
Autophagy plays a dual role in cancer, and regulation of autophagosome assembly influences tumor cell survival under stress. Acetylation of autophagy proteins can alter the balance between cell death and survival. In some contexts, increased autophagosome assembly supports tumor growth by providing nutrients; in others, it promotes cell death. Understanding GO:2000785 may reveal targets for cancer therapy. For example, inhibiting specific regulators could sensitize tumors to chemotherapy.
Reproductive biology and oocyte quality
PLD1 regulates autophagy to promote spindle assembly and migration in mouse oocyte meiosis, indicating that regulation of autophagosome assembly is critical for oocyte quality. Defects in this process can lead to meiotic errors and infertility. Thus, studying GO:2000785 in reproductive contexts may uncover new contraceptives or fertility treatments.
From regulation of autophagosome assembly-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X regulate autophagosome assembly? | CRISPR knockout cell line |
| Does a specific acetylation site on ATG5 control assembly? | Point mutation knock-in (acetylation-deficient) |
| How does S-acylation of p62 affect cargo recruitment? | Point mutation (S-acylation site) or tagged knock-in |
| Can overexpression of PLD1 enhance autophagy in oocytes? | Overexpression model |
| What is the role of HDAC6 in inflammasome-linked autophagy? | Knockout and rescue with wild-type or mutant HDAC6 |
| Does ATG14 phosphorylation regulate fusion? | Phospho-mutant knock-in |
How to Study the regulation of autophagosome assembly Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live-cell imaging | Dynamics of autophagosome formation | Visualizing LC3 puncta and phagophore expansion |
| Proteomics | Post-translational modifications on autophagy proteins | Identifying acetylation and S-acylation sites [1,5] |
| CRISPR library screening | Genes that regulate autophagic flux | Discovering novel regulators like WSTF |
| Western blot | LC3 lipidation and p62 degradation | Monitoring autophagic flux |
| Immunofluorescence | Co-localization of ATG proteins and cargo | Studying p62 droplet recruitment |
| Electron microscopy | Ultrastructure of autophagosomes | Confirming double-membrane formation |
| FRAP | Protein turnover at autophagosome | Measuring assembly dynamics |
| In vitro lipidation assay | LC3 conjugation to membranes | Testing regulatory modifications |
Live-cell imaging of autophagosome formation
Live-cell imaging using fluorescently tagged LC3 or ATG proteins allows real-time visualization of autophagosome assembly. This method can reveal the kinetics of phagophore expansion and closure. It is particularly useful for studying regulatory proteins such as PLD1 and ATG14 [6,8]. Researchers can combine this with FRAP or photoactivation to measure dynamics.
Proteomics and post-translational modification analysis
Mass spectrometry-based proteomics can identify acetylation and S-acylation sites on autophagy proteins. For example, S-acylation of p62 was discovered using such approaches. Acetylation studies have mapped modifications on ATG5, ATG7 and LC3. These methods provide a global view of regulatory modifications.
CRISPR library screening
Genome-wide CRISPR knockout or activation screens can identify novel regulators of autophagosome assembly. By using reporters of autophagic flux, researchers can isolate genes that enhance or inhibit assembly. This approach has been used to uncover context-specific regulators like WSTF. Libraries targeting kinases, phosphatases and ubiquitin-related genes are particularly informative.
Biochemical assays for autophagosome assembly
In vitro reconstitution and lipidation assays measure the conjugation of LC3 to phosphatidylethanolamine, a hallmark of autophagosome assembly. These assays can be used to test the effect of purified regulatory proteins or modifications. For instance, acetylation of ATG proteins can be mimicked in vitro to assess impact. Such biochemical approaches complement cellular studies.
How CRISPR Can Be Used to Study GO:2000785 regulation of autophagosome assembly
Knockout
CRISPR knockout of candidate regulators is the most direct way to test their necessity in autophagosome assembly. For example, knocking out HDAC6 or PLD1 can reveal their roles in inflammasome activation or oocyte meiosis [4,6]. Knockout cell lines are also used to validate findings from CRISPR screens. This approach is robust and can be applied to any cell type.
Point Mutation
Point mutations can dissect the importance of specific residues, such as acetylation or S-acylation sites. For instance, mutating the S-acylation site on p62 prevents its droplet recruitment, linking the modification to function. Similarly, acetylation-deficient mutants of ATG proteins can show enhanced or reduced assembly. These models are invaluable for mechanistic studies.
Knock-in
Knock-in of tagged or mutant versions of genes allows precise tracking and functional analysis. A tagged ATG14 knock-in can be used to study its localization and interactions during assembly. Knock-in of disease-associated mutations can model human pathology. This approach preserves endogenous regulation.
Overexpression
Overexpression of regulatory proteins can enhance or inhibit autophagosome assembly. For example, overexpressing PLD1 in oocytes increases autophagy and affects spindle assembly. Overexpression of p62 mutants can sequester cargo and alter flux. This method is useful for gain-of-function studies.
How EDITGENE Supports regulation of autophagosome assembly Research
Researchers studying regulation of autophagosome assembly-related genes often need to determine whether a candidate gene is causally involved in the process or merely correlated. CRISPR-based models provide the gold standard for establishing causality by enabling precise genetic perturbations. EDITGENE offers a comprehensive suite of services to support such studies, from knockout to knock-in and library screening.
Contact EDITGENE today to design your custom CRISPR model for regulation of autophagosome assembly research.
Frequently Asked Questions About regulation of autophagosome assembly
What is GO:2000785 regulation of autophagosome assembly?
GO:2000785 is a Gene Ontology biological process term defined as any process that modulates the frequency, rate or extent of autophagosome assembly.
What genes are involved in regulation of autophagosome assembly?
Key genes include ATG14, p62/SQSTM1, HDAC6, PLD1, WSTF and core ATG proteins such as ATG5, ATG7 and LC3 [1,3,4,5,6,8].
How is autophagosome assembly regulated by acetylation?
Acetylation of autophagy-related proteins can alter their activity and interactions, thereby modulating autophagosome assembly.
What role does p62 play in autophagosome assembly?
p62 is a cargo receptor; its S-acylation promotes droplet recruitment into autophagosomes, facilitating selective cargo uptake.
How does HDAC6 regulate autophagy and inflammation?
HDAC6 mediates an aggresome-like mechanism for NLRP3 and pyrin inflammasome activation, linking autophagy regulation to inflammation.
What is the connection between PLD1 and oocyte meiosis?
PLD1 regulates autophagy to promote spindle assembly and migration in mouse oocyte meiosis.
How can CRISPR be used to study regulation of autophagosome assembly?
CRISPR knockout, point mutation, knock-in and overexpression models allow precise genetic perturbation to test causality of specific genes and residues [1,5].
What methods are used to measure autophagosome assembly?
Common methods include live-cell imaging of LC3, Western blot for LC3 lipidation, proteomics for post-translational modifications, and CRISPR library screening [1,3,5,6].
Is regulation of autophagosome assembly linked to disease?
Yes, dysregulation is associated with neurodegeneration, cancer, chronic inflammation and oocyte quality issues [2,3,4,6].
What services does EDITGENE offer for autophagy research?
EDITGENE provides CRISPR knockout, point mutation, knock-in, overexpression cell models, CRISPR library screening and bioinformatics services.
Conclusion
Regulation of autophagosome assembly (GO:2000785) is a critical biological process that controls the initiation and progression of autophagy. Through post-translational modifications such as acetylation and S-acylation, and key regulators like HDAC6, PLD1 and ATG14, cells fine-tune autophagosome formation to meet metabolic and immune demands [1,3,4,5,6,8]. Dysregulation of this process contributes to neurodegeneration, cancer, inflammation and reproductive disorders [2,3,4,6]. CRISPR-based models are indispensable for dissecting the causal roles of specific genes and modifications. EDITGENE offers comprehensive services to support such research, from knockout to knock-in and library screening. By leveraging these tools, researchers can advance our understanding of autophagy regulation and develop new therapeutic strategies.
References
- 1. Xu Y et al.. 2023. Acetylation in the regulation of autophagy.. Autophagy 19(2):379-387 PMID: 35435793
- 2. Zaffagnini G et al.. 2024. Mouse oocytes sequester aggregated proteins in degradative super-organelles.. Cell 187(5):1109-1126.e21 PMID: 38382525
- 3. Wang Y et al.. 2025. WSTF nuclear autophagy regulates chronic but not acute inflammation.. Nature 644(8077):780-789 PMID: 40604282
- 4. Magupalli VG et al.. 2020. HDAC6 mediates an aggresome-like mechanism for NLRP3 and pyrin inflammasome activation.. Science 369(6510) PMID: 32943500
- 5. Huang X et al.. 2023. S-acylation of p62 promotes p62 droplet recruitment into autophagosomes in mammalian autophagy.. Mol Cell 83(19):3485-3501.e11 PMID: 37802024
- 6. Zhang J et al.. 2024. PLD1 promotes spindle assembly and migration through regulating autophagy in mouse oocyte meiosis.. Autophagy 20(7):1616-1638 PMID: 38513669
- 7. Orhon I et al.. 2015. Autophagy and regulation of cilia function and assembly.. Cell Death Differ 22(3):389-97 PMID: 25361082
- 8. Bernard A et al.. 2015. Toward an understanding of autophagosome-lysosome fusion: The unsuspected role of ATG14.. Autophagy 11(4):583-4 PMID: 25920502
