GO:0061092 positive regulation of phospholipid translocation: Membrane Lipid Flipping Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0061092 describes any process that increases the frequency, rate, or extent of phospholipid translocation, the flipping of phospholipid molecules between the two monolayers of a membrane bilayer.
• Phospholipid translocation is essential for maintaining membrane lipid asymmetry, which is required for cell signaling, vesicle trafficking, and apoptosis.
• Positive regulation of this process is often mediated by ATP-dependent flippases such as members of the P4-ATPase family, which are assisted by CDC50 chaperone proteins.
• Dysregulated phospholipid translocation is linked to diseases including cancer, neurodegeneration, and atherosclerosis, often through ferroptosis-related pathways involving GPX4 and SLC7A11 [3, 8].
• Key experimental approaches to study this process include CRISPR knockout of flippase genes, lipid asymmetry assays, and ferroptosis phenotyping [1, 5].
• EDITGENE provides CRISPR cell model services to investigate the causal roles of genes in positive regulation of phospholipid translocation.
Description
Phospholipid translocation, the flipping of phospholipid molecules from one leaflet of a membrane bilayer to the other, is a fundamental cellular process that maintains membrane lipid asymmetry and supports diverse signaling events. GO:0061092, positive regulation of phospholipid translocation, refers to any process that increases the frequency, rate, or extent of this flipping activity. This regulation is critical for normal cell physiology, as disruption of lipid asymmetry is associated with pathologies ranging from cancer to neurodegenerative disorders [3, 8]. Understanding the molecular players that positively regulate phospholipid translocation is therefore of broad biomedical interest.
positive regulation of phospholipid translocation At A Glance
| GO ID | GO:0061092 |
|---|---|
| GO term | positive regulation of phospholipid translocation |
| Ontology | biological_process |
| Synonym | None |
| Major function | Increases the rate of phospholipid flipping between membrane monolayers |
| Related processes | Membrane lipid asymmetry, vesicle trafficking, apoptosis, ferroptosis |
| Key regulators | P4-ATPases (flippases), CDC50 proteins, GPX4, SLC7A11 |
| Disease relevance | Cancer, neurodegeneration, atherosclerosis, male infertility |
What Is GO:0061092?
GO:0061092 is a biological process term defined as any process that increases the frequency, rate or extent of the translocation, or flipping, of phospholipid molecules from one monolayer of a membrane bilayer to the opposite monolayer. In simpler terms, it covers the mechanisms that boost the movement of phospholipids across a membrane bilayer, helping to maintain or remodel membrane lipid asymmetry.
Why Is positive regulation of phospholipid translocation Important in Cell Biology?
Positive regulation of phospholipid translocation is important because it controls the dynamic distribution of lipids across cellular membranes, which in turn influences membrane curvature, protein recruitment, and signal transduction. Dysregulation of this process can lead to loss of lipid asymmetry, a hallmark of apoptosis and a trigger for ferroptotic cell death. Recent studies have linked ferroptosis-related genes such as GPX4 and SLC7A11 to phospholipid translocation defects in diseases including atherosclerosis and asthenozoospermia [3, 8]. Thus, understanding how this process is positively regulated offers insights into basic cell biology and potential therapeutic targets.
• Maintains membrane lipid asymmetry essential for cell survival and signaling.
• Regulates apoptosis by exposing phosphatidylserine on the outer leaflet.
• Modulates ferroptosis sensitivity through lipid peroxidation pathways [3, 8].
• Influences vesicle trafficking and membrane fusion events.
• Implicated in cancer progression, including lung adenocarcinoma and osteosarcoma [5, 6].
• Associated with neurodegenerative conditions such as neuronal ferroptosis.
• Plays a role in metabolic diseases like MASH (metabolic dysfunction-associated steatohepatitis).
• Affects reproductive biology, as seen in asthenozoospermia.
• Provides targets for therapeutic intervention in atherosclerosis.
• Enables research into lipid-based drug delivery and membrane engineering.
What Happens During positive regulation of phospholipid translocation?
Initiation by flippase recruitment
In simple terms: The process starts when specialized proteins called flippases are recruited to the membrane.
Positive regulation of phospholipid translocation often begins with the recruitment and activation of ATP-dependent flippases, such as P4-ATPases, to the membrane. These enzymes, in complex with CDC50 chaperones, catalyze the movement of phospholipids against their concentration gradient. Studies on ferroptosis regulators like GPX4 and SLC7A11 suggest that redox status can influence flippase activity [3, 8].
Phospholipid flipping and asymmetry maintenance
In simple terms: Flippases move lipids from one side of the membrane to the other, keeping the two sides different.
Once activated, flippases translocate specific phospholipids, such as phosphatidylserine and phosphatidylethanolamine, from the exoplasmic to the cytoplasmic leaflet. This maintains lipid asymmetry, which is crucial for membrane integrity and function. Disruption of this asymmetry, often due to reduced flippase activity, is associated with diseases like atherosclerosis and cancer [3, 5].
Regulation by SUMOylation and autophagy
In simple terms: Chemical tags like SUMO can modify proteins to control lipid flipping, and recycling of membrane components also plays a role.
SUMOylation, a post-translational modification, has been shown to regulate cell death pathways that intersect with phospholipid translocation. Additionally, selective autophagy of lipid metabolism enzymes, such as ACSL4, can impact phospholipid remodeling and ferroptosis, indirectly affecting translocation processes.
Integration with ferroptosis signaling
In simple terms: When lipid flipping goes wrong, cells can undergo a type of iron-dependent death called ferroptosis.
Positive regulation of phospholipid translocation is closely tied to ferroptosis, a form of regulated cell death driven by lipid peroxidation. GPX4, a key ferroptosis inhibitor, and SLC7A11, a cystine transporter, modulate this process [3, 8]. In osteosarcoma, targeting ABCB6 induces ferroptosis via HIF1A/GPX4, highlighting the interplay between lipid translocation and cell death.
Key Genes Involved in GO:0061092 positive regulation of phospholipid translocation
The following genes and proteins are experimentally implicated in positive regulation of phospholipid translocation or related lipid asymmetry pathways.
| Gene | Major Role | Research Relevance |
|---|---|---|
| GPX4 | Glutathione peroxidase 4, reduces lipid peroxides | Protects against ferroptosis; linked to phospholipid translocation defects [3, 8] |
| SLC7A11 | Cystine/glutamate antiporter, supports glutathione synthesis | Modulates ferroptosis sensitivity and lipid asymmetry [3, 8] |
| ACSL4 | Acyl-CoA synthetase long-chain family member 4 | Promotes lipid peroxidation; regulated by autophagy |
| TRIM28 | E3 SUMO-protein ligase | Regulates SUMOylation and neuronal ferroptosis |
| OPTN | Optineurin, autophagy receptor | Mediates selective autophagic degradation of ACSL4 |
| DDIT4 | DNA damage inducible transcript 4 | Aggravates MASH via GPX4-mediated ferroptosis |
| NRF2 | Nuclear factor erythroid 2-related factor 2 | Upregulates antioxidant genes; stabilizes atherosclerotic plaque |
| ABCB6 | ATP binding cassette subfamily B member 6 | Targeting induces ferroptosis in osteosarcoma |
| HIF1A | Hypoxia inducible factor 1 subunit alpha | Regulates GPX4 and ferroptosis in osteosarcoma |
| XIST | LncRNA X inactive specific transcript | Promotes lung adenocarcinoma growth by regulating GPX4 |
| MCOLN1 | Mucolipin 1, lysosomal cation channel | Facilitates RNA transportation to lysosomes; linked to TLR7 responses |
| P4-ATPases | Phospholipid flippases | Catalyze phospholipid translocation; maintain membrane asymmetry |
| CDC50 | Chaperone for P4-ATPases | Required for flippase function and trafficking |
| ATP8A1 | P4-ATPase flippase | Translocates phosphatidylserine; role in membrane asymmetry |
| ATP8B1 | P4-ATPase flippase | Mutations cause PFIC1; involved in bile canalicular lipid asymmetry |
| ATP11A | P4-ATPase flippase | Regulates phosphatidylserine exposure in apoptosis |
| ATP11C | P4-ATPase flippase | Maintains lipid asymmetry in B cells; linked to immune function |
How Is positive regulation of phospholipid translocation Regulated?
Positive regulation of phospholipid translocation is controlled at multiple levels. Redox status influences flippase activity, as seen with GPX4 and SLC7A11 in ferroptosis [3, 8]. SUMOylation can modify proteins involved in lipid metabolism, affecting translocation. Autophagy regulates the degradation of ACSL4, a lipid peroxidation enzyme, thereby impacting phospholipid remodeling. Additionally, transcription factors like NRF2 upregulate antioxidant genes that protect against lipid peroxidation and support membrane integrity.
positive regulation of phospholipid translocation and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| GPX4 | Ferroptosis, atherosclerosis, asthenozoospermia | GPX4 knockout cell lines, lipid peroxidation assays [3, 8] |
| SLC7A11 | Ferroptosis, atherosclerosis, asthenozoospermia | SLC7A11 overexpression/knockdown cells [3, 8] |
| ACSL4 | Neurodegeneration, ferroptosis | ACSL4 knockout neurons, autophagy flux assays |
| ABCB6 | Osteosarcoma | ABCB6 knockout osteosarcoma cells, HIF1A/GPX4 pathway analysis |
| XIST | Lung adenocarcinoma | XIST knockdown/overexpression in lung cancer cells |
Cancer
Dysregulated phospholipid translocation contributes to cancer progression. In lung adenocarcinoma, lncRNA-XIST promotes tumor growth by regulating GPX4, a key enzyme in lipid peroxidation defense. In osteosarcoma, targeting ABCB6 induces ferroptosis via the HIF1A/GPX4 pathway, suggesting that phospholipid translocation defects can be exploited therapeutically.
Neurodegeneration
Neuronal ferroptosis is linked to impaired phospholipid translocation. TRIM28-mediated SUMOylation inhibits OPTN-selective autophagic degradation of ACSL4, promoting lipid peroxidation and neuronal death. This highlights the importance of lipid asymmetry regulation in neurodegenerative diseases.
Metabolic and Cardiovascular Diseases
In metabolic dysfunction-associated steatohepatitis (MASH), hepatocyte DDIT4 aggravates disease progression through GPX4-mediated ferroptosis. In atherosclerosis, berberine inhibits ferroptosis and stabilizes plaques via the NRF2/SLC7A11/GPX4 pathway, underscoring the role of phospholipid translocation in cardiovascular health.
Reproductive Disorders
Reduced SLC7A11 and GPX4 contribute to ferroptosis in sperm from individuals with asthenozoospermia, linking phospholipid translocation defects to male infertility.
From positive regulation of phospholipid translocation-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X regulate phospholipid translocation? | CRISPR knockout of gene X in HeLa or HEK293 cells |
| Does a specific point mutation in a flippase alter its activity? | CRISPR point mutation knock-in of the mutation in endogenous locus |
| Does overexpression of gene Y increase phospholipid flipping? | CRISPR-mediated overexpression or lentiviral overexpression |
| How does SUMOylation affect phospholipid translocation? | Knock-in of SUMOylation-deficient mutant |
| What is the role of gene Z in ferroptosis-related lipid asymmetry? | CRISPR knockout in cancer cell lines followed by ferroptosis induction |
| Can we screen for novel regulators of phospholipid translocation? | CRISPR library screening with lipid asymmetry readout |
How to Study the positive regulation of phospholipid translocation Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Annexin V flow cytometry | Phosphatidylserine exposure | Apoptosis and lipid asymmetry |
| CRISPR knockout | Gene function loss | Causal role of GPX4, SLC7A11, ABCB6 [1, 5] |
| Lipid peroxidation assay | Malondialdehyde or 4-HNE levels | Ferroptosis quantification [2, 8] |
| SUMOylation assay | Protein SUMOylation status | Regulation of TRIM28 and ACSL4 [1, 4] |
| RNA-seq | Transcriptome changes | Pathway analysis in cancer |
| Immunofluorescence | Protein localization and membrane asymmetry | Flippase trafficking |
| CRISPR library screening | Pooled gene function | Discovery of novel regulators |
| Bioinformatics pathway enrichment | GO term and pathway overrepresentation | Data mining of lipid translocation genes |
Lipid asymmetry assays
Flow cytometry using Annexin V or fluorescent phospholipid analogs can measure phosphatidylserine exposure, a proxy for phospholipid translocation. These assays are widely used to study flippase activity and apoptosis [3, 8].
CRISPR knockout and phenotypic analysis
CRISPR-Cas9 knockout of candidate genes such as GPX4, SLC7A11, or ABCB6 allows researchers to assess their causal role in phospholipid translocation and ferroptosis. Phenotypic readouts include lipid peroxidation, cell viability, and membrane asymmetry [1, 5].
Proteomics and interactomics
Mass spectrometry-based proteomics can identify proteins associated with flippases and their regulators. For example, SUMOylation targets can be mapped using SUMO proteomics.
Transcriptomics and bioinformatics
RNA-seq and bioinformatics analyses reveal gene expression changes in pathways related to phospholipid translocation. Studies on XIST and GPX4 in lung adenocarcinoma utilized such approaches.
How CRISPR Can Be Used to Study GO:0061092 positive regulation of phospholipid translocation
Knockout
CRISPR knockout of genes such as GPX4, SLC7A11, or ABCB6 can reveal their essential roles in positive regulation of phospholipid translocation. For example, GPX4 knockout increases lipid peroxidation and ferroptosis, indirectly affecting membrane asymmetry [3, 8].
Point Mutation
Introducing point mutations in flippase genes (e.g., ATP8A1, ATP11A) can dissect catalytic residues required for phospholipid translocation. Such models help distinguish between loss-of-function and gain-of-function effects.
Knock-in
Knock-in of tagged flippases (e.g., GFP-ATP8A1) allows live-cell imaging of phospholipid translocation dynamics. Additionally, knock-in of disease-associated mutations can model lipid asymmetry defects.
Overexpression
CRISPR-mediated overexpression of genes like SLC7A11 or GPX4 can protect cells from ferroptosis and enhance phospholipid translocation capacity. This approach is useful for studying gain-of-function phenotypes [3, 8].
How EDITGENE Supports positive regulation of phospholipid translocation Research
Researchers studying positive regulation of phospholipid translocation-related genes often need to determine whether a candidate gene is causally involved in maintaining membrane lipid asymmetry or modulating ferroptosis sensitivity. EDITGENE provides tailored CRISPR cell model services to address these questions with precision.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of phospholipid translocation research.
Frequently Asked Questions About positive regulation of phospholipid translocation
What is GO:0061092?
GO:0061092 is a Gene Ontology biological process term for positive regulation of phospholipid translocation, which increases the flipping of phospholipid molecules between membrane monolayers.
What genes are involved in positive regulation of phospholipid translocation?
Key genes include GPX4, SLC7A11, ACSL4, ABCB6, and P4-ATPase flippases such as ATP8A1 and ATP11A [1, 3, 5, 8].
How is phospholipid translocation regulated?
It is regulated by flippase activity, redox status, SUMOylation, and autophagy, with GPX4 and SLC7A11 playing central roles in ferroptosis-related regulation [1, 3, 4, 8].
What diseases are associated with defective phospholipid translocation?
Defects are linked to cancer, neurodegeneration, atherosclerosis, MASH, and asthenozoospermia [1, 2, 3, 5, 6, 8].
What is the role of GPX4 in phospholipid translocation?
GPX4 reduces lipid peroxides and protects membrane lipids, indirectly supporting phospholipid asymmetry; its loss triggers ferroptosis [3, 8].
How can I study positive regulation of phospholipid translocation?
Use CRISPR knockout of candidate genes, lipid asymmetry assays, and ferroptosis phenotyping [1, 5].
What are P4-ATPases?
P4-ATPases are ATP-dependent flippases that catalyze phospholipid translocation across membranes, often with CDC50 chaperones.
Is phospholipid translocation related to ferroptosis?
Yes, dysregulated phospholipid translocation can lead to lipid peroxidation and ferroptosis, as seen with GPX4 and SLC7A11 [3, 8].
What model systems are used to study this process?
Common models include CRISPR knockout cell lines, overexpression models, and animal models of ferroptosis-related diseases [1, 5].
How does EDITGENE support research on GO:0061092?
EDITGENE offers CRISPR knockout, point mutation, knock-in, overexpression, library screening, and bioinformatics services for genes involved in phospholipid translocation.
Conclusion
Positive regulation of phospholipid translocation (GO:0061092) is a critical biological process that maintains membrane lipid asymmetry and influences cell survival, signaling, and death pathways. Its dysregulation is implicated in a wide range of diseases, from cancer to neurodegeneration. Continued research using advanced CRISPR models will uncover new therapeutic opportunities targeting this process.
References
- 1. Liu W et al.. 2025. Redox regulation of TRIM28 facilitates neuronal ferroptosis by promoting SUMOylation and inhibiting OPTN-selective autophagic degradation of ACSL4.. Cell Death Differ 32(6):1041-1057 PMID: 39875520
- 2. Wang H et al.. 2026. Hepatocyte DDIT4 aggravates MASH progression through GPX4-mediated ferroptosis.. Metabolism 180:156622 PMID: 41997496
- 3. Wang TT et al.. 2024. Berberine Inhibits Ferroptosis and Stabilizes Atherosclerotic Plaque through NRF2/SLC7A11/GPX4 Pathway.. Chin J Integr Med 30(10):906-916 PMID: 39167283
- 4. Sheng Z et al.. 2021. SUMOylation modification-mediated cell death.. Open Biol 11(7):210050 PMID: 34255975
- 5. Lin Z et al.. 2026. Targeting ABCB6 induces ferroptosis in osteosarcoma cells via HIF1A/GPX4 pathway.. Zhong Nan Da Xue Xue Bao Yi Xue Ban 51(5):903-923 PMID: 42565568
- 6. Lu CL et al.. 2025. LncRNA-XIST Promotes Lung Adenocarcinoma Growth and Inhibits Ferroptosis by Regulating GPX4.. Mol Biotechnol 67(1):187-195 PMID: 38153663
- 7. Li X et al.. 2015. Mucolipin 1 positively regulates TLR7 responses in dendritic cells by facilitating RNA transportation to lysosomes.. Int Immunol 27(2):83-94 PMID: 25239130
- 8. Hao X et al.. 2023. Reduction of SLC7A11 and GPX4 Contributing to Ferroptosis in Sperm from Asthenozoospermia Individuals.. Reprod Sci 30(1):247-257 PMID: 35729458
