GO:1903146 regulation of autophagy of mitochondrion: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1903146 (regulation of autophagy of mitochondrion) describes any process that modulates the frequency, rate or extent of mitochondrion degradation by an autophagic process.
• Mitophagy is the selective autophagic removal of damaged or superfluous mitochondria and is a core component of mitochondrial quality control.
• Regulation occurs at multiple levels, including post-translational modifications of cargo receptors and the core autophagy machinery.
• Key regulators include PINK1, PRKN (Parkin), BNIP3, BNIP3L/NIX, FUNDC1, SQSTM1/p62, and the core ATG proteins.
• Dysregulated mitophagy is implicated in liver diseases, neurodegeneration, cancer, and metabolic disorders.
• CRISPR knockout, point-mutation, knock-in, and overexpression models are essential for dissecting causal roles of mitophagy regulators.
Description
GO:1903146, regulation of autophagy of mitochondrion, is a biological process term that encompasses any mechanism controlling the selective autophagic degradation of mitochondria. This process, commonly referred to as mitophagy, is a central arm of mitochondrial quality control and is essential for maintaining cellular homeostasis by eliminating damaged or excess mitochondria. Because mitochondria are critical for energy production, calcium buffering, and apoptosis, their regulated removal must be tightly controlled to prevent cellular dysfunction. Research into GO:1903146 has expanded rapidly due to its links to aging, neurodegeneration, cancer, and metabolic diseases. Understanding the molecular players and regulatory layers of mitophagy is therefore a high-priority goal in cell biology and translational medicine.
regulation of autophagy of mitochondrion At A Glance
| GO ID | GO:1903146 |
|---|---|
| GO term | regulation of autophagy of mitochondrion |
| Ontology | biological_process |
| Synonym | regulation of mitochondrion degradation |
| Definition | Any process that modulates the frequency, rate or extent of mitochondrion degradation by an autophagic process. |
| Major function | Controls selective autophagic removal of mitochondria (mitophagy). |
| Key regulators | PINK1, PRKN, BNIP3, BNIP3L, FUNDC1, SQSTM1, ATG proteins. |
| Associated diseases | Liver disease, neurodegeneration, cancer, metabolic disorders. |
| Research methods | CRISPR screens, fluorescence imaging, proteomics, and biochemical assays. |
What Is GO:1903146?
According to the Gene Ontology, GO:1903146 (regulation of autophagy of mitochondrion) is defined as any process that modulates the frequency, rate or extent of mitochondrion degradation by an autophagic process. In simpler terms, it covers all the signals and molecular events that turn mitophagy up or down, ensuring that mitochondrial removal matches cellular needs.
Why Is regulation of autophagy of mitochondrion Important in Cell Biology?
Regulation of autophagy of mitochondrion is vital because it determines whether cells survive or die under stress, and its dysfunction is a common feature of many human diseases. By controlling the removal of damaged mitochondria, this process prevents the accumulation of reactive oxygen species and the release of pro-apoptotic factors, thereby maintaining cellular health. Consequently, understanding GO:1903146 is essential for developing therapies that target mitochondrial quality control in conditions such as liver disease, neurodegeneration, and cancer.
• Maintains mitochondrial quality control by eliminating damaged organelles.
• Prevents excessive ROS production and cellular oxidative stress.
• Regulates cell death pathways, including apoptosis and necrosis.
• Implicated in liver diseases such as non-alcoholic steatohepatitis and hepatocellular carcinoma.
• Plays a role in neurodegenerative diseases like Parkinson's and Alzheimer's.
• Influences cancer cell survival and metabolism.
• Modulated by post-translational modifications of cargo receptors.
• Crosstalk with mitochondrial biogenesis ensures homeostasis.
• Target for therapeutic intervention in metabolic disorders.
• Requires precise experimental models to dissect causal mechanisms.
What Happens During regulation of autophagy of mitochondrion?
Initiation and cargo recognition
In simple terms: The cell tags damaged mitochondria for destruction.
Regulation of mitophagy begins with the recognition of damaged mitochondria by specific cargo receptors such as SQSTM1/p62, BNIP3, BNIP3L/NIX, and FUNDC1. These receptors bind to ubiquitinated mitochondrial proteins or directly to LC3 on the autophagosome membrane, linking the mitochondrion to the autophagy machinery. The PINK1-PRKN pathway is a major initiator: upon mitochondrial depolarization, PINK1 accumulates on the outer membrane and recruits PRKN, which ubiquitinates outer membrane proteins to signal degradation.
Autophagosome formation
In simple terms: A double-membrane sac forms around the tagged mitochondrion.
Once a mitochondrion is tagged, the core autophagy machinery, including ATG proteins, is recruited to form an autophagosome around the cargo. This step is regulated by upstream signals such as mTOR and AMPK, which control the activity of the ULK1 complex and the class III PI3K complex. Post-translational modifications of ATG proteins and cargo receptors further fine-tune autophagosome biogenesis.
Autophagosome-lysosome fusion and degradation
In simple terms: The sac fuses with a lysosome, and the mitochondrion is digested.
The mature autophagosome containing the mitochondrion fuses with a lysosome, forming an autolysosome where the mitochondrial contents are degraded by lysosomal hydrolases. This step is regulated by SNARE proteins and Rab GTPases, and its efficiency determines the rate of mitophagy. Degradation products are recycled back to the cytosol for reuse.
Crosstalk with mitochondrial dynamics
In simple terms: Mitochondrial fission and fusion decide whether a mitochondrion is removed or kept.
Mitochondrial fission, mediated by DNM1L/DRP1, often precedes mitophagy and is required to segregate damaged portions for degradation. Conversely, fusion proteins like MFN1/2 and OPA1 can protect mitochondria from removal. The balance between fission and fusion is a key regulatory node in GO:1903146.
Regulation by metabolites and post-translational modifications
In simple terms: Small molecules and chemical tags on proteins can speed up or slow down mitophagy.
Endogenous metabolites such as NAD+, acetyl-CoA, and succinate can modulate mitophagy through effects on signaling and protein modifications. Post-translational modifications, including phosphorylation, ubiquitination, acetylation, and SUMOylation, regulate the activity and interactions of mitophagy receptors and ATG proteins. These layers allow the cell to adapt mitophagy to its metabolic state.
Key Genes Involved in GO:1903146 regulation of autophagy of mitochondrion
The following genes and proteins are central to the regulation of autophagy of mitochondrion (GO:1903146), based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PINK1 | Serine/threonine kinase that accumulates on depolarized mitochondria and recruits PRKN | Key initiator of mitophagy; mutations cause Parkinson's disease |
| PRKN | E3 ubiquitin ligase that ubiquitinates outer mitochondrial membrane proteins | Central regulator; mutations linked to Parkinson's disease |
| BNIP3 | Bcl-2 family protein that acts as a mitophagy receptor | Hypoxia-induced mitophagy; cancer and ischemia research |
| BNIP3L/NIX | Mitophagy receptor involved in developmental and stress-induced mitophagy | Required for erythrocyte maturation; hypoxia response |
| FUNDC1 | Mitophagy receptor regulated by phosphorylation | Hypoxia-induced mitophagy; cardiovascular research |
| SQSTM1/p62 | Ubiquitin-binding autophagy receptor | Selective autophagy; neurodegeneration and cancer |
| OPTN | Autophagy receptor that binds ubiquitinated cargo | Glaucoma and ALS research |
| NBR1 | Autophagy receptor with ubiquitin-binding domains | Selective autophagy pathways |
| CALCOCO2/NDP52 | Autophagy receptor for ubiquitinated cargo | Bacterial autophagy and mitophagy |
| MAP1LC3B | Ubiquitin-like protein conjugated to autophagosome membranes | Core autophagy marker; autophagosome formation |
| GABARAP | LC3 family protein involved in autophagosome maturation | Autophagy and mitophagy regulation |
| ATG5 | Core autophagy protein required for LC3 lipidation | Essential for autophagosome formation |
| ATG7 | E1-like enzyme for LC3 and ATG12 conjugation | Core autophagy machinery; knockout models |
| ATG12 | Ubiquitin-like protein conjugated to ATG5 | Autophagosome elongation |
| ULK1 | Serine/threonine kinase that initiates autophagy | Upstream regulator; mTOR target |
| BECN1 | Component of PI3K complex for autophagosome nucleation | Autophagy initiation; cancer research |
| DNM1L/DRP1 | GTPase mediating mitochondrial fission | Required for mitophagy; dynamics research |
| MFN2 | Mitochondrial fusion protein | Opposes mitophagy; Charcot-Marie-Tooth disease |
How Is regulation of autophagy of mitochondrion Regulated?
Regulation of autophagy of mitochondrion is controlled by multiple signaling pathways. The mTOR kinase inhibits autophagy under nutrient-rich conditions, while AMPK activates it during energy stress. The PINK1-PRKN pathway is the best-characterized mitophagy-specific regulatory axis, responding to mitochondrial depolarization. Additionally, hypoxia stabilizes BNIP3, BNIP3L, and FUNDC1 to promote mitophagy. Post-translational modifications of ATG proteins and cargo receptors provide another layer of regulation. Crosstalk with mitochondrial biogenesis ensures that mitophagy is balanced with the synthesis of new mitochondria.
regulation of autophagy of mitochondrion and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PINK1 | Parkinson's disease | Knockout iPSC-derived neurons; point-mutation knock-in mice |
| PRKN | Parkinson's disease | PRKN knockout mice; overexpression in neuronal cells |
| BNIP3 | Cancer, ischemia | BNIP3 knockout cancer cell lines; hypoxia models |
| FUNDC1 | Cardiac ischemia-reperfusion injury | FUNDC1 knockout mice; cardiomyocyte-specific overexpression |
| SQSTM1 | Neurodegeneration, cancer | SQSTM1 knockout cells; tagged knock-in for imaging |
Neurodegenerative diseases
Impaired mitophagy is strongly linked to Parkinson's disease, where mutations in PINK1 and PRKN cause accumulation of damaged mitochondria and dopaminergic neuron death. Other neurodegenerative conditions, including Alzheimer's disease and amyotrophic lateral sclerosis, also show mitophagy dysfunction. Enhancing mitophagy is being explored as a therapeutic strategy.
Liver diseases
Mitophagy plays a dual role in liver diseases such as non-alcoholic steatohepatitis and hepatocellular carcinoma. In some contexts, mitophagy protects hepatocytes from injury, while in others it promotes cancer cell survival. Understanding its regulation is critical for developing targeted therapies.
Cancer
Cancer cells often exploit mitophagy to survive metabolic stress and chemotherapy. Depending on the tumor type, mitophagy can be tumor-suppressive or tumor-promoting. Targeting mitophagy regulators is a promising anticancer strategy.
Metabolic and cardiovascular disorders
Dysregulated mitophagy contributes to insulin resistance, obesity, and cardiac ischemia-reperfusion injury. Modulating mitophagy may improve metabolic and cardiovascular outcomes.
From regulation of autophagy of mitochondrion-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is PINK1 required for mitophagy? | PINK1 knockout cell lines and mice |
| Does a point mutation in PRKN affect mitophagy? | PRKN point-mutation knock-in cells |
| How does BNIP3L/NIX contribute to mitophagy? | BNIP3L knockout and tagged knock-in models |
| Can overexpression of FUNDC1 enhance mitophagy? | FUNDC1 overexpression cell lines |
| What is the role of SQSTM1 in selective mitophagy? | SQSTM1 knockout and knock-in models |
| How do post-translational modifications regulate mitophagy? | Point-mutation knock-in of modification sites |
How to Study the regulation of autophagy of mitochondrion Process
| Method | What It Measures | Typical Application |
|---|---|---|
| mt-Keima imaging | Mitochondrial delivery to lysosomes | Live-cell mitophagy flux |
| LC3-II western blot | Autophagosome formation | Autophagy induction |
| p62/SQSTM1 levels | Autophagic cargo degradation | Selective autophagy assessment |
| CRISPR knockout screen | Genes required for mitophagy | Unbiased discovery of regulators |
| Proteomics | Mitochondrial protein changes | Post-translational modification analysis |
| Electron microscopy | Ultrastructure of mitophagy | Confirmation of autophagosome engulfment |
| Mitochondrial respiration assay | Mitochondrial function | Quality control assessment |
| Fluorescence microscopy | Colocalization of mitochondria and lysosomes | Visualizing mitophagy events |
Fluorescence imaging and reporters
Mitophagy is commonly monitored using fluorescent reporters such as mt-Keima or mito-QC, which allow real-time visualization of mitochondrial delivery to lysosomes. These reporters are valuable for high-content screening and live-cell imaging.
Biochemical and proteomic assays
Western blotting for mitochondrial proteins (e.g., TOMM20, TIMM23) and autophagy markers (LC3-II, p62) is used to assess mitophagy flux. Proteomics can identify changes in mitochondrial protein abundance and post-translational modifications.
Genetic screens
CRISPR knockout and overexpression screens have identified novel regulators of mitophagy, including genes involved in mitochondrial dynamics and metabolism. These screens are powerful for unbiased discovery.
Electron microscopy
Transmission electron microscopy provides ultrastructural evidence of mitochondria within autophagosomes or autolysosomes, confirming mitophagy at high resolution.
How CRISPR Can Be Used to Study GO:1903146 regulation of autophagy of mitochondrion
Knockout
CRISPR knockout of genes such as PINK1, PRKN, BNIP3L, or ATG5 is used to determine their requirement for mitophagy. Knockout cell lines and animal models provide loss-of-function evidence for causal roles in GO:1903146.
Point Mutation
Point-mutation knock-in models, such as disease-associated mutations in PRKN or PINK1, allow researchers to study how specific amino acid changes affect mitophagy regulation. These models are crucial for understanding pathogenic mechanisms.
Knock-in
Tagged knock-in of mitophagy receptors (e.g., GFP-BNIP3, HA-FUNDC1) enables visualization and biochemical isolation of protein complexes. Knock-in of reporter cassettes (e.g., mt-Keima) facilitates quantitative mitophagy assays.
Overexpression
Overexpression of mitophagy regulators such as FUNDC1, BNIP3, or PRKN is used to enhance mitophagy and test sufficiency. Overexpression models help identify downstream effects and potential therapeutic targets.
How EDITGENE Supports regulation of autophagy of mitochondrion Research
Researchers studying regulation of autophagy of mitochondrion-related genes often need to determine whether a candidate gene is causally involved in mitophagy or merely correlated with it. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell models, enabling rigorous functional validation of mitophagy regulators.
Contact EDITGENE today to design your custom CRISPR model for regulation of autophagy of mitochondrion research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| HDAC6 Knockout HEK293 Cell Line | EDJ-KQ2396 | Human | 10013 | Details Get a Quote |
| HAX1 Knockout HEK293 Cell Line | EDJ-KQ2558 | Human | 10456 | Details Get a Quote |
| PINK1 Knockout HEK293 Cell Line | EDJ-KQ3426 | Human | 65018 | Details Get a Quote |
| ATP13A2 Knockout HEK293 Cell Line | EDJ-KQ12222 | Human | 23400 | Details Get a Quote |
| ATP13A2 Knockout HeLa Cell Line | EDJ-KQ18206 | Human | 23400 | Details Get a Quote |
| HAX1 Knockout A-549 Cell Line | EDJ-KQ23213 | Human | 10456 | Details Get a Quote |
| HAX1 Knockout HCT 116 Cell Line | EDJ-KQ23214 | Human | 10456 | Details Get a Quote |
| HAX1 Knockout HeLa Cell Line | EDJ-KQ23215 | Human | 10456 | Details Get a Quote |
| PINK1 Knockout A-549 Cell Line | EDJ-KQ25145 | Human | 65018 | Details Get a Quote |
| PINK1 Knockout HCT 116 Cell Line | EDJ-KQ25146 | Human | 65018 | Details Get a Quote |
| PINK1 Knockout HeLa Cell Line | EDJ-KQ25147 | Human | 65018 | Details Get a Quote |
| ATP13A2 Knockout HCT 116 Cell Line | EDJ-KQ40976 | Human | 23400 | Details Get a Quote |
| VDAC1 Knockout HeLa Cell Line | EDJ-KQ18275 | Human | 7416 | Details Get a Quote |
| HDAC6 Knockout HCT 116 Cell Line | EDJ-KQ21559 | Human | 10013 | Details Get a Quote |
| HDAC6 Knockout A-549 Cell Line | EDJ-KQ22885 | Human | 10013 | Details Get a Quote |
Displaying Records 1 To 15 Of 24 Records
Frequently Asked Questions About regulation of autophagy of mitochondrion
What is GO:1903146?
GO:1903146 is the Gene Ontology term for regulation of autophagy of mitochondrion, defined as any process that modulates the frequency, rate or extent of mitochondrion degradation by an autophagic process.
What genes are involved in regulation of autophagy of mitochondrion?
Key genes include PINK1, PRKN, BNIP3, BNIP3L/NIX, FUNDC1, SQSTM1/p62, and core ATG genes such as ATG5 and ATG7.
What is the difference between mitophagy and autophagy?
Mitophagy is a selective form of autophagy that specifically targets mitochondria for degradation, whereas autophagy can degrade various cellular components.
How is mitophagy regulated?
Mitophagy is regulated by the PINK1-PRKN pathway, cargo receptors, post-translational modifications, and upstream signals like mTOR and AMPK.
What diseases are associated with defective mitophagy?
Defective mitophagy is linked to Parkinson's disease, liver diseases, cancer, and metabolic disorders.
What methods are used to study regulation of autophagy of mitochondrion?
Common methods include fluorescence imaging with mt-Keima, western blotting for LC3-II and p62, CRISPR screens, proteomics, and electron microscopy.
Can CRISPR be used to study mitophagy?
Yes, CRISPR knockout, point-mutation knock-in, and overexpression models are widely used to dissect gene function in mitophagy.
What is the role of PINK1 and PRKN in mitophagy?
PINK1 accumulates on depolarized mitochondria and recruits PRKN, which ubiquitinates outer membrane proteins to initiate mitophagy.
How does mitochondrial fission affect mitophagy?
Mitochondrial fission, mediated by DNM1L/DRP1, is often required to segregate damaged mitochondria for autophagic degradation.
What are the therapeutic implications of targeting mitophagy?
Modulating mitophagy is being explored for neurodegenerative diseases, liver diseases, cancer, and cardiovascular disorders.
Conclusion
GO:1903146, regulation of autophagy of mitochondrion, is a fundamental biological process that controls mitochondrial quality and cellular homeostasis. Its dysregulation contributes to a wide range of human diseases, making it a prime target for therapeutic intervention. Advances in CRISPR-based models and imaging technologies continue to unravel the complex regulatory networks governing mitophagy. EDITGENE's suite of gene editing services empowers researchers to causally link specific genes to mitophagy regulation and to accelerate drug discovery in this field.
References
- 1. Liu S et al.. 2023. Autophagy: Regulator of cell death.. Cell Death Dis 14(10):648 PMID: 37794028
- 2. Lamark T et al.. 2017. Regulation of selective autophagy: the p62/SQSTM1 paradigm.. Essays Biochem 61(6):609-624 PMID: 29233872
- 3. Zhang T et al.. 2022. The multifaceted regulation of mitophagy by endogenous metabolites.. Autophagy 18(6):1216-1239 PMID: 34583624
- 4. Liu BH et al.. 2024. Mitochondrial quality control in human health and disease.. Mil Med Res 11(1):32 PMID: 38812059
- 5. Liu L et al.. 2023. Crosstalk between mitochondrial biogenesis and mitophagy to maintain mitochondrial homeostasis.. J Biomed Sci 30(1):86 PMID: 37821940
- 6. Ma X et al.. 2020. Role and Mechanisms of Mitophagy in Liver Diseases.. Cells 9(4) PMID: 32244304
- 7. Lechado Terradas A et al.. 2021. Regulation of mitochondrial cargo-selective autophagy by posttranslational modifications.. J Biol Chem 297(5):101339 PMID: 34688664
- 8. Kleele T et al.. 2021. Distinct fission signatures predict mitochondrial degradation or biogenesis.. Nature 593(7859):435-439 PMID: 33953403
