GO:1902774 late endosome to lysosome transport: Vesicle Trafficking Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1902774 describes the directed movement of substances from late endosomes to lysosomes, a terminal step in the endocytic pathway.
• Fusion between late endosomes and lysosomes requires Rab7, the HOPS tethering complex, SNAREs, and the v-ATPase, and is regulated by nutrient-sensing machinery [1,2,5].
• Late endosome positioning and transport depend on ER contact sites, microtubules, and motor adaptors such as SKIP and Arl8b [3,5].
• Nutrient availability and lipid metabolism, including CPT1C and the v-ATPase-Ragulator complex, modulate late endosome/lysosome transport [2,4].
• Defects in this pathway are linked to neurodegeneration, cancer, and lysosomal storage disorders, making it a target for mechanistic and therapeutic studies [1,4,6].
• CRISPR knockout, point mutation, knock-in, and overexpression models enable causal dissection of genes controlling late endosome to lysosome transport [5,6].
Description
Late endosome to lysosome transport (GO:1902774) is the directed movement of substances from late endosomes to lysosomes, a fundamental step that delivers endocytosed cargo for degradation and recycling. This process ensures cellular clearance of receptors, lipids, and metabolites, and its dysregulation is associated with human disease [1,6]. Researchers study this pathway to understand membrane trafficking, organelle identity, and nutrient sensing [2,5]. The pathway involves vesicle tethering, fusion, and motor-driven transport, with key roles for Rab7, the HOPS complex, and the v-ATPase [1,5]. Recent work has revealed that late endosome/lysosome positioning and fusion are dynamically regulated by ER contact sites and metabolic cues [3,4]. Because defects in late endosome to lysosome transport contribute to neurodegeneration and cancer, it is a critical area for both basic and translational research [1,4,6].
late endosome to lysosome transport At A Glance
| GO ID | GO:1902774 |
|---|---|
| GO term | late endosome to lysosome transport |
| Ontology | biological_process |
| Synonym | prevacuolar compartment to lysosome transport |
| Major function | Directed movement of substances from late endosomes to lysosomes for degradation and recycling |
| Key regulators | Rab7, HOPS complex, SNAREs, v-ATPase, Arl8b, SKIP, TBC1D15 |
| Related pathways | Endocytic pathway, autophagy, lysosomal biogenesis |
| Disease relevance | Neurodegeneration, cancer, lysosomal storage disorders |
What Is GO:1902774?
GO:1902774, late endosome to lysosome transport, is defined as the directed movement of substances from late endosome to lysosome. This biological process encompasses the mechanisms that transfer cargo from late endosomes (also called prevacuolar compartments) to lysosomes for degradation, including vesicle tethering, fusion, and motor-dependent transport [1,5].
Why Is late endosome to lysosome transport Important in Cell Biology?
Late endosome to lysosome transport is essential for cellular homeostasis because it delivers cargo to lysosomes for degradation and recycling. This process controls the turnover of signaling receptors, lipids, and metabolites, and its dysfunction leads to accumulation of undegraded material, which is a hallmark of lysosomal storage disorders and neurodegeneration [1,6]. Moreover, the pathway is tightly linked to nutrient sensing and metabolic regulation, as the lysosomal v-ATPase-Ragulator complex coordinates AMPK and mTORC1 signaling. Understanding this transport step provides insights into membrane trafficking, organelle dynamics, and disease mechanisms, and offers potential therapeutic targets [4,5].
• Maintains cellular clearance by delivering endocytosed cargo to lysosomes.
• Regulates nutrient sensing through the v-ATPase-Ragulator complex and mTORC1/AMPK.
• Controls late endosome positioning and fusion via ER contact sites and motor proteins [3,5].
• Modulates axon growth and neuronal function through CPT1C-dependent transport.
• Involved in antigen presentation and immune surveillance via SKIP-HOPS mediated trafficking.
• Dysregulated in cancer, contributing to altered receptor recycling and signaling [1,6].
• Implicated in neurodegeneration when lysosomal degradation is impaired [1,4].
• Provides targets for therapeutic intervention in lysosomal storage disorders.
• Serves as a model for studying organelle identity and membrane fusion [1,5].
• Enables high-content screening for modulators of endolysosomal transport.
What Happens During late endosome to lysosome transport?
Vesicle tethering and Rab7 recruitment
In simple terms: The late endosome must be physically brought close to the lysosome before they can fuse.
Late endosome to lysosome transport begins with the recruitment of Rab7 to late endosomes, which is required for their subsequent fusion with lysosomes. Rab7 interacts with the HOPS tethering complex, which bridges the two organelles and facilitates SNARE-mediated fusion. The v-ATPase and RILP also contribute to Rab7 activation and late endosome positioning. This step is regulated by ER contact sites that direct late endosome transport.
Motor-dependent transport and positioning
In simple terms: Late endosomes are moved along the cytoskeleton to reach lysosomes.
Late endosomes are transported along microtubules by motor proteins, and this movement is coordinated by adaptor proteins such as SKIP and Arl8b. The SKIP-HOPS complex recruits TBC1D15 to promote a Rab7-to-Arl8b identity switch, which controls late endosome transport. CPT1C senses nutrients and regulates late endosome/lysosome anterograde transport, influencing axon growth. ER contact sites also direct late endosome transport, highlighting the integration of organelle positioning with fusion.
Fusion and cargo delivery
In simple terms: The late endosome and lysosome merge, delivering cargo for degradation.
Fusion between late endosomes and lysosomes is mediated by SNARE proteins and requires the HOPS complex. The v-ATPase maintains lysosomal pH, and collapse of late endosomal pH elicits a rapid Rab7 response via the V-ATPase and RILP. This fusion event delivers endocytosed cargo, including receptors and lipids, to lysosomes for degradation. Defects in fusion lead to cargo accumulation and are associated with disease [1,6].
Regulation by nutrient signaling
In simple terms: The cell's nutrient status can speed up or slow down this transport step.
The lysosomal v-ATPase-Ragulator complex acts as a common activator for AMPK and mTORC1, switching between catabolism and anabolism. This complex senses nutrients and regulates late endosome to lysosome transport accordingly. CPT1C also senses nutrients and regulates late endosome/lysosome anterograde transport. Thus, nutrient availability directly impacts the efficiency of cargo delivery to lysosomes [2,4].
Key Genes Involved in GO:1902774 late endosome to lysosome transport
The following genes and proteins are central to late endosome to lysosome transport, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| RAB7 | Recruits HOPS complex and mediates fusion | Key regulator of late endosome-lysosome fusion |
| HOPS complex | Tethering and SNARE-mediated fusion | Essential for fusion; mutations cause disease |
| V-ATPase | Acidifies lysosomes and activates Rab7 | Nutrient sensing and pH regulation [2,6] |
| RILP | Links Rab7 to dynein for transport | Regulates late endosome positioning |
| Arl8b | Promotes anterograde transport | Identity switch from Rab7 |
| SKIP | Recruits TBC1D15 for Rab7-to-Arl8b switch | Controls late endosome transport |
| TBC1D15 | GAP for Rab7 | Regulates Rab7 inactivation |
| CPT1C | Nutrient sensor for anterograde transport | Links metabolism to transport |
| SNAREs | Mediate membrane fusion | Core fusion machinery |
| ER contact sites | Direct late endosome transport | Spatial regulation |
| Ragulator | Activates AMPK and mTORC1 | Nutrient signaling hub |
| LAMP1 | Lysosomal marker | Used to identify lysosomes |
| Rab7 effectors | Diverse functions in transport | Potential drug targets |
| VPS proteins | HOPS subunits | Mutations linked to lysosomal disorders |
| Dynein | Retrograde transport motor | Positions late endosomes |
| Kinesin | Anterograde transport motor | Moves late endosomes |
How Is late endosome to lysosome transport Regulated?
Late endosome to lysosome transport is regulated by nutrient signaling through the v-ATPase-Ragulator complex, which activates AMPK and mTORC1 to balance catabolism and anabolism. The v-ATPase also maintains the acidic pH required for Rab7 activation, and pH collapse triggers a rapid Rab7 response via RILP. CPT1C senses nutrients and regulates anterograde transport of late endosomes/lysosomes. Additionally, ER contact sites provide spatial cues that direct late endosome transport. These regulatory layers ensure that cargo delivery to lysosomes is matched to cellular metabolic demands [2,4].
late endosome to lysosome transport and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| RAB7 | Charcot-Marie-Tooth neuropathy | Knockout and point mutation in neuronal cells |
| HOPS subunits | Lysosomal storage disorders | Knockout in fibroblasts and iPSC-derived neurons |
| CPT1C | Neurological disorders, axon growth defects | Knockout and overexpression in primary neurons |
| V-ATPase | Cancer, lysosomal pH dysregulation | Point mutation and knockout in cancer cell lines |
| Arl8b | Cancer, trafficking defects | Knockout and knock-in in HeLa cells |
Neurodegeneration
Impaired late endosome to lysosome transport leads to accumulation of undegraded material in neurons, contributing to neurodegeneration. CPT1C-dependent regulation of late endosome/lysosome transport affects axon growth, and its dysfunction is linked to neurological disorders. Defects in Rab7 or HOPS complex components cause Charcot-Marie-Tooth disease and other neuropathies.
Cancer
Altered late endosome to lysosome transport affects receptor recycling and signaling, promoting tumorigenesis. The v-ATPase-Ragulator complex integrates nutrient signals to support cancer cell growth. Targeting this pathway may sensitize cancer cells to metabolic stress [2,6].
Lysosomal storage disorders
Mutations in genes required for late endosome-lysosome fusion, such as HOPS subunits, cause lysosomal storage disorders characterized by cargo accumulation. pH dysregulation in late endosomes further impairs degradation, exacerbating disease.
From late endosome to lysosome transport-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of RAB7 impair late endosome-lysosome fusion? | RAB7 knockout cell line |
| How does a disease-associated point mutation affect transport? | Point mutation knock-in |
| Where does a candidate protein localize during transport? | Tagged knock-in (e.g., GFP) |
| Does overexpression of CPT1C enhance anterograde transport? | Overexpression cell line |
| Which genes regulate late endosome positioning? | CRISPR library screening |
| How does nutrient status affect transport? | Knockout of v-ATPase subunits |
How to Study the late endosome to lysosome transport Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live-cell imaging | Dynamics of vesicle fusion and transport | Visualizing late endosome-lysosome fusion |
| DNA-PAINT | Nanoscale distribution of proteins | Heterogeneity of late endosomes/lysosomes |
| Proteomics | Protein composition of organelles | Identifying transport machinery |
| CRISPR screening | Genes required for transport | Discovery of novel regulators |
| Cell-free reconstitution | Minimal components for transport | Dissecting molecular requirements |
| pH measurement | Luminal pH of organelles | Assessing v-ATPase function |
| Immunofluorescence | Localization of proteins | Confirming organelle markers |
| Co-immunoprecipitation | Protein-protein interactions | Validating Rab7 effectors |
Live-cell imaging
Live-cell imaging with fluorescently tagged late endosome and lysosome markers allows real-time visualization of transport and fusion events. Multiplexed DNA-PAINT imaging reveals heterogeneity of late endosome/lysosomes. This method is ideal for assessing dynamic changes in response to genetic perturbations.
Proteomics and interactomics
Proteomic approaches identify proteins associated with late endosomes and lysosomes, uncovering components of the transport machinery. Affinity purification of Rab7 effectors followed by mass spectrometry can reveal dynamic interactions. These methods help define the molecular players in late endosome to lysosome transport.
CRISPR screening
Genome-wide CRISPR knockout screens can identify genes required for late endosome to lysosome transport, using cargo accumulation or pH-sensitive reporters as readouts. Such screens have uncovered regulators like SKIP and TBC1D15. This unbiased approach is powerful for discovering novel pathway components.
Biochemical reconstitution
Cell-free reconstitution assays using purified organelles can dissect the minimal machinery required for transport from the trans-Golgi network to late endosomes. Similar assays can be adapted to study late endosome to lysosome fusion. These systems allow precise manipulation of components and conditions.
How CRISPR Can Be Used to Study GO:1902774 late endosome to lysosome transport
Knockout
CRISPR knockout of genes such as RAB7, HOPS subunits, or Arl8b can abolish late endosome to lysosome transport, leading to cargo accumulation [1,5]. Knockout cell lines are essential for establishing causality and for phenotypic screens.
Point Mutation
Introducing disease-associated point mutations (e.g., in RAB7 or V-ATPase subunits) via CRISPR allows study of partial loss-of-function or gain-of-function effects on transport. These models mimic human mutations and reveal mechanistic details.
Knock-in
Tagged knock-in of proteins like LAMP1 or Rab7 with fluorescent or affinity tags enables real-time tracking of late endosomes and lysosomes. This approach preserves endogenous regulation and expression levels.
Overexpression
CRISPR-mediated overexpression of CPT1C or other regulators can enhance anterograde transport and reveal rate-limiting steps. Overexpression models are useful for testing sufficiency and for gain-of-function studies.
How EDITGENE Supports late endosome to lysosome transport Research
Researchers studying late endosome to lysosome transport-related genes often need to determine whether a candidate gene is causally involved in cargo delivery, organelle positioning, or fusion. EDITGENE provides comprehensive CRISPR-based services to generate precisely engineered cell models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for late endosome to lysosome transport research.
Frequently Asked Questions About late endosome to lysosome transport
What is late endosome to lysosome transport?
It is the directed movement of substances from late endosomes to lysosomes, a key step in the endocytic pathway for cargo degradation.
What genes are involved in late endosome to lysosome transport?
Key genes include RAB7, HOPS complex subunits, V-ATPase subunits, Arl8b, SKIP, TBC1D15, and CPT1C [1,2,4,5].
How is late endosome to lysosome transport regulated?
It is regulated by nutrient signaling via the v-ATPase-Ragulator complex, pH, and ER contact sites [2,3,6].
What diseases are associated with defects in this pathway?
Neurodegeneration, cancer, and lysosomal storage disorders are linked to impaired late endosome to lysosome transport [1,4,6].
What is the role of Rab7 in late endosome to lysosome transport?
Rab7 recruits the HOPS complex and mediates fusion between late endosomes and lysosomes.
How can I study late endosome to lysosome transport?
Live-cell imaging, proteomics, CRISPR screening, and cell-free reconstitution are common methods [7,8].
What is the GO ID for late endosome to lysosome transport?
The GO ID is GO:1902774.
What is the synonym for GO:1902774?
The synonym is prevacuolar compartment to lysosome transport.
How does the v-ATPase regulate this transport?
The v-ATPase maintains lysosomal pH and activates Rab7; pH collapse triggers a rapid Rab7 response.
Can CRISPR be used to model late endosome to lysosome transport defects?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are widely used [5,6].
Conclusion
Late endosome to lysosome transport (GO:1902774) is a central biological process that ensures delivery of cargo to lysosomes for degradation and recycling. Its regulation by nutrient signaling, pH, and organelle contact sites highlights its integration with cellular metabolism [2,3,6]. Defects in this pathway contribute to neurodegeneration, cancer, and lysosomal storage disorders, making it a critical area for research [1,4,6]. CRISPR-based models and advanced imaging techniques continue to uncover new mechanistic details and potential therapeutic targets [5,8].
References
- 1. Luzio JP et al.. 2010. Endosome-lysosome fusion.. Biochem Soc Trans 38(6):1413-6 PMID: 21118098
- 2. Zhang CS et al.. 2014. The lysosomal v-ATPase-Ragulator complex is a common activator for AMPK and mTORC1, acting as a switch between catabolism and anabolism.. Cell Metab 20(3):526-40 PMID: 25002183
- 3. Wijdeven RH et al.. 2015. ER contact sites direct late endosome transport.. Bioessays 37(12):1298-302 PMID: 26440125
- 4. Palomo-Guerrero M et al.. 2019. Sensing of nutrients by CPT1C regulates late endosome/lysosome anterograde transport and axon growth.. Elife 8 PMID: 31868590
- 5. Jongsma ML et al.. 2020. SKIP-HOPS recruits TBC1D15 for a Rab7-to-Arl8b identity switch to control late endosome transport.. EMBO J 39(6):e102301 PMID: 32080880
- 6. Mulligan RJ et al.. 2024. Collapse of late endosomal pH elicits a rapid Rab7 response via the V-ATPase and RILP.. J Cell Sci 137(9) PMID: 38578235
- 7. Blanchette JM et al.. 2004. Cell-free reconstitution of transport from the trans-golgi network to the late endosome/prevacuolar compartment.. J Biol Chem 279(47):48767-73 PMID: 15364946
- 8. Bond C et al.. 2025. Heterogeneity of late endosome/lysosomes shown by multiplexed DNA-PAINT imaging.. J Cell Biol 224(1) PMID: 39485275
