GO:0090141 positive regulation of mitochondrial fission: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0090141 (positive regulation of mitochondrial fission) describes any process that increases the rate, frequency or extent of mitochondrial fission, the division of a mitochondrion into two or more separate compartments.
• The core fission machinery is centered on the dynamin-related GTPase DRP1 (DNM1L), which is recruited to mitochondria by receptors and adaptors and is activated by phosphorylation and other post-translational modifications.
• Positive regulation of mitochondrial fission is driven by kinases such as AMPK acting on INF2, by epigenetic and metabolic signals that modify DRP1 activity, and by ERK-dependent pathways that control DRP1 function.
• Dysregulated mitochondrial fission contributes to vascular senescence and atherosclerosis, diabetic cardiomyopathy, glomerular podocyte injury, glioblastoma invasion, and immune evasion in cancer.
• Key experimental approaches include live-cell imaging of mitochondrial morphology, phospho-specific analysis of DRP1, and CRISPR-based knockout, point-mutation, knock-in and overexpression models to test causality.
• EDITGENE provides end-to-end CRISPR services including knockout, point-mutation, knock-in, overexpression cell models, CRISPR library screening and bioinformatics to dissect positive regulation of mitochondrial fission.
Description
Mitochondria are dynamic organelles that continuously undergo fission and fusion to maintain cellular homeostasis. Positive regulation of mitochondrial fission (GO:0090141) refers to any process that increases the rate, frequency or extent of mitochondrial fission, the division of a mitochondrion within a cell to form two or more separate mitochondrial compartments. This process is essential for mitochondrial quality control, distribution during cell division, and apoptotic signaling, and its dysregulation is increasingly linked to human disease. Understanding how positive regulation of mitochondrial fission is controlled at the molecular level is therefore a central question in cell biology and translational research.
positive regulation of mitochondrial fission At A Glance
| GO ID | GO:0090141 |
|---|---|
| GO term | positive regulation of mitochondrial fission |
| Ontology | biological_process |
| Synonym | positive regulation of mitochondrial division |
| Major function | Increases the rate, frequency or extent of mitochondrial fission, the division of a mitochondrion into two or more separate compartments. |
| Key effector | DRP1 (DNM1L), a dynamin-related GTPase that mediates mitochondrial scission. |
| Upstream regulators | AMPK, ERK, RCAN1, S-adenosylhomocysteine hydrolase, and other signaling and epigenetic modulators. |
| Disease relevance | Implicated in atherosclerosis, diabetic cardiomyopathy, glomerular podocyte injury, glioblastoma progression and tumor immune evasion. |
| Research methods | Live-cell imaging, phospho-protein analysis, CRISPR knockout/knock-in/overexpression models, and CRISPR library screening. |
What Is GO:0090141?
GO:0090141 (positive regulation of mitochondrial fission) is a biological process term defined as any process that increases the rate, frequency or extent of mitochondrial fission. Mitochondrial fission is the division of a mitochondrion within a cell to form two or more separate mitochondrial compartments. In practical terms, this term captures the upstream signals, molecular effectors and regulatory events that promote the scission of mitochondria, as opposed to the opposing process of mitochondrial fusion.
Why Is positive regulation of mitochondrial fission Important in Cell Biology?
Positive regulation of mitochondrial fission is important because it controls mitochondrial morphology, quality control, distribution and cell fate decisions. Excessive or dysregulated fission has been linked to vascular senescence and atherosclerosis, diabetic cardiomyopathy, glomerular podocyte injury, glioblastoma migration and invasion, and tumor immune evasion. Conversely, understanding how fission is positively regulated provides a framework for developing therapeutic strategies that target mitochondrial dynamics in these diseases.
• Controls mitochondrial morphology and the balance between fission and fusion.
• Supports mitochondrial quality control and removal of damaged mitochondria.
• Regulates cell division and distribution of mitochondria to daughter cells.
• Contributes to apoptosis and cell death signaling.
• Is dysregulated in cardiovascular disease such as atherosclerosis and diabetic cardiomyopathy.
• Is implicated in kidney podocyte injury and glomerular disease.
• Promotes migration and invasion in glioblastoma.
• Supports tumor immune evasion through mitochondrial dynamics.
• Provides a target for pharmacological modulation of mitochondrial fission.
• Can be studied with CRISPR-based genetic models to establish causality.
What Happens During positive regulation of mitochondrial fission?
Initiation and DRP1 recruitment
In simple terms: The cell marks a spot on the mitochondrion and calls in the scission protein DRP1.
Positive regulation of mitochondrial fission begins with signals that recruit the dynamin-related GTPase DRP1 (DNM1L) from the cytosol to the mitochondrial outer membrane. DRP1 is the central effector of mitochondrial fission, and its recruitment and activity are controlled by phosphorylation and other post-translational modifications. The mitochondrial fission regulator DRP1 also controls post-transcriptional regulation of TNF-alpha, linking fission to inflammatory signaling.
Phosphorylation and activation of fission effectors
In simple terms: Enzymes add phosphate tags to fission proteins to switch them on.
Kinases and phosphatases regulate the activity of DRP1 and other fission effectors. For example, phosphorylation of INF2 by AMPK promotes mitochondrial fission and oncogenic function in endometrial cancer. Epigenetic modulation of Drp1-mediated mitochondrial fission by inhibition of S-adenosylhomocysteine hydrolase promotes vascular senescence and atherosclerosis, showing that metabolic and epigenetic signals converge on DRP1 regulation. ERK/Drp1-mediated mitochondrial fission is also involved in glioblastoma migration and invasion.
Mitochondrial constriction and scission
In simple terms: The mitochondrion is squeezed and cut into two pieces.
Once DRP1 is recruited and activated, it assembles into oligomeric rings that constrict the mitochondrial tubule, leading to scission. This step is supported by adaptor proteins and by the actin cytoskeleton. Suppression of RCAN1 alleviated lipid accumulation and mitochondrial fission in diabetic cardiomyopathy, indicating that RCAN1 is a positive regulator of fission in this context. Berberine protects glomerular podocytes via inhibiting Drp1-mediated mitochondrial fission and dysfunction, demonstrating that pharmacological inhibition of fission can be protective.
Downstream consequences for cell fate
In simple terms: After fission, the cell uses the new mitochondria for different jobs, including survival or death.
Positive regulation of mitochondrial fission has downstream consequences for cell fate, including apoptosis, proliferation, migration and immune signaling. The tumor-intrinsic role of the m6A reader YTHDF2 in regulating immune evasion involves mitochondrial dynamics. The ubiquitin ligase KLHL6 drives resistance to CD8+ T cell dysfunction, linking mitochondrial regulation to T cell function. These findings show that positive regulation of mitochondrial fission is integrated with broader cellular programs.
Key Genes Involved in GO:0090141 positive regulation of mitochondrial fission
The following genes and proteins are central to positive regulation of mitochondrial fission, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| DNM1L (DRP1) | Dynamin-related GTPase that mediates mitochondrial scission | Core effector; target for knockout and point-mutation studies |
| INF2 | Actin assembly factor phosphorylated by AMPK to promote fission | Links AMPK signaling to fission in cancer |
| AMPK | Kinase that phosphorylates INF2 and promotes fission | Energy-sensing regulator of fission |
| RCAN1 | Regulator of calcineurin; suppression reduces fission in diabetic cardiomyopathy | Disease-linked positive regulator |
| ERK | Kinase that regulates Drp1-mediated fission | Signaling node in glioblastoma |
| AHCY (S-adenosylhomocysteine hydrolase) | Epigenetic modulator of Drp1-mediated fission | Metabolic-epigenetic link to vascular senescence |
| YTHDF2 | m6A reader involved in immune evasion and mitochondrial regulation | Links RNA modification to fission and immunity |
| KLHL6 | Ubiquitin ligase driving resistance to CD8+ T cell dysfunction | Immune-related mitochondrial regulator |
| TNF-alpha | Cytokine whose post-transcriptional regulation is controlled by DRP1 | Inflammation-fission crosstalk |
| MFN1/2 | Mitochondrial fusion proteins opposing fission | Balance with fission |
| OPA1 | Inner membrane fusion protein opposing fission | Balance with fission |
| PINK1 | Mitophagy kinase linked to mitochondrial quality control | Quality control context |
| PRKN (Parkin) | E3 ubiquitin ligase in mitophagy | Quality control context |
| FIS1 | DRP1 receptor on mitochondria | Recruitment platform |
| MFF | DRP1 receptor on mitochondria | Recruitment platform |
| MIEF1/2 | DRP1 receptors on mitochondria | Recruitment platform |
| GDAP1 | Outer membrane protein involved in fission | Peripheral neuropathy link |
| DNM2 | Dynamin involved in membrane remodeling | Accessory scission factor |
How Is positive regulation of mitochondrial fission Regulated?
Positive regulation of mitochondrial fission is controlled by multiple signaling pathways. AMPK phosphorylates INF2 to promote fission and oncogenic function in endometrial cancer. ERK signaling regulates Drp1-mediated fission in glioblastoma. Epigenetic modulation by inhibition of S-adenosylhomocysteine hydrolase promotes Drp1-mediated fission in vascular senescence and atherosclerosis. RCAN1 suppression alleviates lipid accumulation and mitochondrial fission in diabetic cardiomyopathy. These examples show that fission is regulated by kinase cascades, epigenetic changes and metabolic signals.
positive regulation of mitochondrial fission and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| DNM1L (DRP1) | Atherosclerosis, diabetic cardiomyopathy, cancer | Knockout and point-mutation cell models |
| INF2 | Endometrial cancer | Phospho-mutant knock-in models |
| RCAN1 | Diabetic cardiomyopathy | Knockout and overexpression models |
| YTHDF2 | Tumor immune evasion | Knockout and tagged knock-in models |
| KLHL6 | CD8+ T cell dysfunction | Overexpression and knockout models |
Cardiovascular disease
Positive regulation of mitochondrial fission is implicated in vascular senescence and atherosclerosis, where epigenetic modulation of Drp1-mediated fission by inhibition of S-adenosylhomocysteine hydrolase promotes disease. In diabetic cardiomyopathy, suppression of RCAN1 alleviated lipid accumulation and mitochondrial fission. These findings suggest that excessive fission contributes to cardiovascular pathology.
Kidney disease
Berberine protects glomerular podocytes via inhibiting Drp1-mediated mitochondrial fission and dysfunction, indicating that positive regulation of fission is harmful in podocyte injury. This supports targeting fission as a therapeutic strategy in glomerular disease.
Cancer
Phosphorylation of INF2 by AMPK promotes mitochondrial fission and oncogenic function in endometrial cancer. Rab32 promotes glioblastoma migration and invasion via regulation of ERK/Drp1-mediated mitochondrial fission. The m6A reader YTHDF2 regulates immune evasion, linking mitochondrial dynamics to tumor immunity. These studies show that positive regulation of fission supports cancer progression.
Immune regulation
The ubiquitin ligase KLHL6 drives resistance to CD8+ T cell dysfunction, connecting mitochondrial regulation to T cell function. DRP1 controls post-transcriptional regulation of TNF-alpha, linking fission to inflammatory cytokine production. These findings highlight the role of fission in immune responses.
From positive regulation of mitochondrial fission-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is DRP1 required for mitochondrial fission? | DRP1 knockout cell line |
| Does phosphorylation of INF2 promote fission? | INF2 phospho-mutant knock-in |
| Does RCAN1 suppression reduce fission? | RCAN1 knockout or knockdown |
| Does YTHDF2 regulate immune evasion via fission? | YTHDF2 knockout with immune co-culture |
| Does KLHL6 overexpression protect T cells? | KLHL6 overexpression cell model |
| Can CRISPR library screening identify new fission regulators? | Genome-wide CRISPR knockout library |
How to Study the positive regulation of mitochondrial fission Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live-cell imaging | Mitochondrial morphology and fission events | Assessing fission in knockout or drug-treated cells |
| Phospho-specific Western blot | Phosphorylation of DRP1, INF2 | Testing kinase pathways |
| CRISPR knockout screening | Genes required for fission | Identifying novel regulators |
| RNA-seq | Transcriptional changes | Measuring downstream effects |
| Proteomics | Protein abundance and modifications | Global analysis of fission machinery |
| Immunofluorescence | Subcellular localization of DRP1 | Recruitment studies |
| Seahorse assay | Mitochondrial respiration | Functional consequences of fission |
Live-cell imaging of mitochondrial morphology
Live-cell imaging with mitochondrial-targeted fluorescent probes allows direct visualization of fission events and mitochondrial network morphology. This method is widely used to assess positive regulation of mitochondrial fission in response to genetic or pharmacological perturbations.
Phospho-protein analysis
Phospho-specific antibodies and mass spectrometry can measure phosphorylation of DRP1 and INF2, providing mechanistic insight into how kinases such as AMPK and ERK regulate fission.
CRISPR-based genetic screens
Genome-wide CRISPR knockout or activation screens can identify novel positive regulators of mitochondrial fission. Such screens have been used to uncover genes controlling mitochondrial dynamics and immune evasion.
Transcriptomic and proteomic profiling
RNA-seq and proteomics can reveal changes in gene expression and protein abundance associated with altered fission. For example, DRP1 controls post-transcriptional regulation of TNF-alpha, which can be detected by RNA-seq.
How CRISPR Can Be Used to Study GO:0090141 positive regulation of mitochondrial fission
Knockout
CRISPR knockout of genes such as DNM1L, INF2 or RCAN1 can test whether they are required for positive regulation of mitochondrial fission. For example, DRP1 knockout blocks fission and alters TNF-alpha regulation. RCAN1 suppression reduces fission in diabetic cardiomyopathy models.
Point Mutation
Point mutations can be introduced to test specific phosphorylation sites. For instance, mutation of AMPK phosphorylation sites on INF2 can determine whether phosphorylation is required for fission and oncogenic function. Similarly, DRP1 phospho-mutants can dissect regulatory mechanisms.
Knock-in
Knock-in of tagged or reporter alleles allows visualization and tracking of fission proteins at endogenous levels. Tagged knock-in of DRP1 or INF2 can be used for live-cell imaging and proteomic analysis.
Overexpression
Overexpression of positive regulators such as KLHL6 or YTHDF2 can test sufficiency for promoting fission or related phenotypes. KLHL6 overexpression drives resistance to CD8+ T cell dysfunction, and YTHDF2 overexpression affects immune evasion.
How EDITGENE Supports positive regulation of mitochondrial fission Research
Researchers studying positive regulation of mitochondrial fission-related genes often need to determine whether a candidate gene is causally involved in fission, whether specific residues or domains are required, and how its expression level affects mitochondrial dynamics. EDITGENE provides a comprehensive suite of CRISPR services to address these questions with rigor and reproducibility.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of mitochondrial fission research.
Frequently Asked Questions About positive regulation of mitochondrial fission
What is GO:0090141 positive regulation of mitochondrial fission?
GO:0090141 is a biological process term defined as any process that increases the rate, frequency or extent of mitochondrial fission, the division of a mitochondrion into two or more separate compartments.
What genes are involved in positive regulation of mitochondrial fission?
Key genes include DNM1L (DRP1), INF2, AMPK, RCAN1, ERK, AHCY, YTHDF2 and KLHL6, among others.
How is mitochondrial fission regulated?
Mitochondrial fission is regulated by phosphorylation of DRP1 and INF2, epigenetic modulation, and signaling pathways such as AMPK and ERK.
What diseases are linked to excessive mitochondrial fission?
Excessive fission is linked to atherosclerosis, diabetic cardiomyopathy, glomerular podocyte injury, glioblastoma and tumor immune evasion.
What is the role of DRP1 in mitochondrial fission?
DRP1 is the central GTPase that mediates mitochondrial scission and is required for positive regulation of mitochondrial fission.
How can I study positive regulation of mitochondrial fission in the lab?
Common methods include live-cell imaging, phospho-protein analysis, CRISPR knockout/knock-in/overexpression models, and CRISPR library screening.
What is the difference between mitochondrial fission and fusion?
Fission divides mitochondria into smaller fragments, while fusion joins them; positive regulation of fission promotes the division process.
Can CRISPR be used to study mitochondrial fission?
Yes, CRISPR knockout, point mutation, knock-in and overexpression models are widely used to test causality in mitochondrial fission research.
What is the role of INF2 in mitochondrial fission?
INF2 is phosphorylated by AMPK to promote mitochondrial fission and oncogenic function in endometrial cancer.
How does RCAN1 affect mitochondrial fission?
Suppression of RCAN1 alleviated lipid accumulation and mitochondrial fission in diabetic cardiomyopathy.
Conclusion
Positive regulation of mitochondrial fission (GO:0090141) is a fundamental biological process that controls mitochondrial morphology, quality control and cell fate. Its dysregulation is implicated in cardiovascular disease, kidney injury, cancer and immune dysfunction. Continued research using CRISPR-based models and advanced imaging will further clarify the molecular mechanisms and therapeutic potential of targeting this process.
References
- 1. Cheng H et al.. 2026. The ubiquitin ligase KLHL6 drives resistance to CD8(+) T cell dysfunction.. Nature 651(8105):451-461 PMID: 41535474
- 2. You Y et al.. 2023. Epigenetic modulation of Drp1-mediated mitochondrial fission by inhibition of S-adenosylhomocysteine hydrolase promotes vascular senescence and atherosclerosis.. Redox Biol 65:102828 PMID: 37517319
- 3. Shu S et al.. 2024. Suppression of RCAN1 alleviated lipid accumulation and mitochondrial fission in diabetic cardiomyopathy.. Metabolism 158:155977 PMID: 39053690
- 4. Gao F et al.. 2020. The Mitochondrial Fission Regulator DRP1 Controls Post-Transcriptional Regulation of TNF-α.. Front Cell Infect Microbiol 10:593805 PMID: 33520735
- 5. Ding Y et al.. 2024. Phosphorylation of INF2 by AMPK promotes mitochondrial fission and oncogenic function in endometrial cancer.. Cell Death Dis 15(1):65 PMID: 38233384
- 6. Qin X et al.. 2019. Berberine Protects Glomerular Podocytes via Inhibiting Drp1-Mediated Mitochondrial Fission and Dysfunction.. Theranostics 9(6):1698-1713 PMID: 31037132
- 7. Chen P et al.. 2023. Rab32 promotes glioblastoma migration and invasion via regulation of ERK/Drp1-mediated mitochondrial fission.. Cell Death Dis 14(3):198 PMID: 36922509
- 8. Xiao S et al.. 2024. The tumor-intrinsic role of the m(6)A reader YTHDF2 in regulating immune evasion.. Sci Immunol 9(95):eadl2171 PMID: 38820140
