GO:0031254 cell trailing edge: Components, Assembly and Research Methods, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0031254 cell trailing edge is the area of a motile cell opposite to the direction of movement, also called the back of the cell or trailing edge.
• The trailing edge is not a passive tail; it actively coordinates retraction, adhesion disassembly, and signaling to maintain persistent directional migration.
• Cdc42 activity at the trailing edge is required for persistent directional migration of keratinocytes, revealing a surprising role for a classic front-edge GTPase at the rear.
• ITGBL1 promotes cell migration by preferentially inhibiting integrin-ECM binding at the trailing edge, providing a molecular mechanism for rear-specific adhesion turnover.
• The trailing edge is the site of retraction fiber and migrasome formation, structures that incorporate endoplasmic reticulum and phosphatidylinositol (4,5)-bisphosphate-Rab35 signaling.
• Studying the trailing edge requires live-cell imaging, adhesion dynamics assays, and CRISPR-based perturbation of rear-edge components.
Description
Cell migration is a fundamental process in development, immune surveillance, and tissue repair, and it depends on the coordinated polarization of the cell into a leading edge and a trailing edge. The trailing edge, defined as the area of a motile cell opposite to the direction of movement, is increasingly recognized as an active signaling and structural compartment rather than a passive rear. In migrating keratinocytes, Cdc42 activity at the trailing edge is required for persistent directional migration, demonstrating that rear-edge signaling directly influences front-rear coordination. Similarly, ITGBL1 promotes cell migration by preferentially inhibiting integrin-ECM binding at the trailing edge, highlighting how adhesion turnover at the rear controls migration speed and directionality. The trailing edge is also the site where retraction fibers and migrasomes form, structures that mediate contact-dependent incorporation of endoplasmic reticulum and are regulated by the phosphatidylinositol (4,5)-bisphosphate-Rab35 axis. Because defects in cell migration contribute to cancer invasion, developmental disorders, and impaired wound healing, understanding the molecular composition and regulation of the trailing edge is of broad biomedical importance. This article integrates the QuickGO definition of GO:0031254 with verified PubMed literature to provide a research-grade overview of trailing edge components, assembly, functions, and experimental methods.
cell trailing edge At A Glance
| GO ID | GO:0031254 |
|---|---|
| GO term | cell trailing edge |
| Ontology | cellular_component |
| Synonym | back of cell; trailing edge |
| Definition | The area of a motile cell opposite to the direction of movement. |
| Major function | Coordinates rear-edge retraction, adhesion disassembly, and signaling for persistent directional migration. |
| Associated structures | Retraction fibers, migrasomes, and rear-edge actin networks. |
| Key regulators | Cdc42, ITGBL1, Rab35, phosphatidylinositol (4,5)-bisphosphate. |
| Relevance | Cell migration, cancer invasion, development, and wound healing. |
What Is GO:0031254?
According to the Gene Ontology, GO:0031254 cell trailing edge is defined as the area of a motile cell opposite to the direction of movement. It is a cellular component term with synonyms including back of cell and trailing edge. This region is structurally and functionally distinct from the leading edge and comprises specialized actin-rich and adhesion-related structures that mediate retraction, adhesion disassembly, and rear-to-front signaling during migration.
Why Is cell trailing edge Important in Cell Biology?
The trailing edge is critical because it actively determines the efficiency and directionality of cell migration, a process central to embryonic development, immune responses, and tissue regeneration. Disruption of rear-edge signaling can impair persistent directional migration, as shown for Cdc42 in keratinocytes, and alter adhesion turnover, as demonstrated for ITGBL1. Moreover, the trailing edge is the origin of retraction fibers and migrasomes, which mediate intercellular communication and organelle transfer. Consequently, genes and pathways acting at the trailing edge are candidate targets for understanding cancer metastasis, developmental defects, and chronic wounds.
• Defines the rear compartment of a migrating cell and is essential for front-rear polarity.
• Cdc42 activity at the trailing edge is required for persistent directional migration of keratinocytes.
• ITGBL1 inhibits integrin-ECM binding at the trailing edge to promote migration.
• The phosphatidylinositol (4,5)-bisphosphate-Rab35 axis regulates migrasome formation at the trailing edge.
• Retraction fibers and migrasomes incorporate endoplasmic reticulum in a contact-dependent manner.
• Trailing edge dynamics are relevant to cancer cell invasion and metastasis.
• Rear-edge adhesion disassembly is required for efficient cell movement in development.
• Microtubule and actin networks cooperate at the trailing edge to coordinate retraction.
• Defects in trailing edge components may contribute to impaired wound healing and developmental disorders.
• The trailing edge is a site for studying organelle transfer and intercellular communication.
Structure and Composition of cell trailing edge
Rear-edge actin and retraction fiber assembly
In simple terms: The back of the cell builds actin-rich fibers that pull the rear forward.
The trailing edge is characterized by actin-rich retraction fibers that connect the rear of the cell to the substrate or extracellular matrix. These fibers are dynamic structures that form as the cell moves forward and are associated with the rear-edge actin cytoskeleton. Actin-mediated movement is a general principle observed across cell types, and at the trailing edge it supports retraction and structural integrity. The assembly of retraction fibers is contact-dependent and can incorporate endoplasmic reticulum, indicating that the trailing edge is a site of organelle remodeling.
Adhesion complexes and integrin regulation
In simple terms: Adhesion molecules at the back of the cell must be released for the cell to move forward.
Integrin-based adhesions at the trailing edge must be disassembled to allow rear retraction. ITGBL1 preferentially inhibits integrin-ECM binding at the trailing edge, thereby promoting cell migration by facilitating adhesion turnover at the rear. This spatial regulation ensures that adhesions are retained at the front and released at the back, a hallmark of polarized migration.
Migrasomes and retraction fiber-associated structures
In simple terms: The back of the cell leaves behind small packets called migrasomes.
Migrasomes are vesicular structures that form at the trailing edge on retraction fibers. Their formation is regulated by the phosphatidylinositol (4,5)-bisphosphate-Rab35 axis, which controls the assembly of these rear-edge structures. Recent work shows that endoplasmic reticulum is incorporated into retraction fibers and migrasomes in a contact-dependent manner, linking the trailing edge to organelle transfer and intercellular communication.
Microtubule and signaling organization at the rear
In simple terms: Microtubules and signaling proteins help organize the back of the cell.
Microtubules contribute to cell migration by organizing polarity and trafficking, and they participate in rear-edge retraction. Cdc42, a Rho-family GTPase traditionally associated with the leading edge, also exhibits activity at the trailing edge that is required for persistent directional migration of keratinocytes. This rear-edge Cdc42 activity highlights the presence of active signaling networks at the trailing edge that coordinate with microtubule and actin dynamics.
Key Genes Involved in GO:0031254 cell trailing edge
The following genes and proteins have been experimentally implicated in trailing edge structure, signaling, or function based on the verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CDC42 | Rho GTPase with activity at the trailing edge required for persistent directional migration | Knockout or point-mutation models to study rear-edge signaling in keratinocytes |
| ITGBL1 | Inhibits integrin-ECM binding preferentially at the trailing edge to promote migration | Overexpression and knockout models to dissect rear-edge adhesion turnover |
| RAB35 | Regulates migrasome formation via the phosphatidylinositol (4,5)-bisphosphate-Rab35 axis | Knockout and knock-in models to study trailing edge vesicle formation |
| PIP2 (phosphatidylinositol 4,5-bisphosphate) | Lipid regulator of migrasome formation at the trailing edge | Lipid-binding domain knock-in reporters to visualize rear-edge dynamics |
| Actin (e.g., ACTB) | Cytoskeletal component of retraction fibers and rear-edge structures | Tagged knock-in for live imaging of trailing edge actin |
| Integrins | Mediate adhesion at the trailing edge that must be disassembled for retraction | Point mutations to alter integrin-ECM binding at the rear |
| Microtubule subunits (e.g., TUBA1B) | Organize polarity and trafficking during migration | Knockout or tagged knock-in to study rear-edge microtubule dynamics |
| ER markers (e.g., CALR, CANX) | Endoplasmic reticulum incorporated into retraction fibers and migrasomes | Tagged knock-in for contact-dependent ER transfer studies |
| Myosin II (e.g., MYH9) | Contractility for rear retraction (general migration mechanism) | Knockout and point-mutation models to test rear-edge contractility |
| RhoA | Regulates actomyosin contractility during migration | Overexpression and knockout to study trailing edge retraction |
| Rac1 | Front-rear polarity and migration (general) | Knockout models to assess polarity and trailing edge defects |
| Cdc42 effectors (e.g., N-WASP) | Actin nucleation downstream of Cdc42 at the rear | Knockout to test rear-edge actin assembly |
| Rab35 effectors | Trafficking for migrasome formation | Knock-in reporters to track rear-edge vesicles |
| Integrin-linked kinase (ILK) | Adhesion signaling at the rear (general) | Point mutations to alter adhesion dynamics |
| Paxillin (PXN) | Focal adhesion component at the trailing edge | Tagged knock-in for live adhesion imaging |
| Vimentin (VIM) | Intermediate filament support during migration | Knockout to study rear-edge mechanics |
| Cofilin (CFL1) | Actin depolymerization for retraction | Overexpression to enhance rear-edge turnover |
| Gelsolin (GSN) | Actin severing at the trailing edge | Knockout to test retraction fiber dynamics |
How Is cell trailing edge Regulated?
Trailing edge dynamics are regulated by Rho-family GTPases, lipid signaling, and adhesion turnover. Cdc42 activity at the trailing edge is required for persistent directional migration of keratinocytes, indicating that rear-edge GTPase signaling is a regulatory node. The phosphatidylinositol (4,5)-bisphosphate-Rab35 axis controls migrasome formation at the trailing edge, linking lipid metabolism to rear-edge vesicle biogenesis. ITGBL1 regulates integrin-ECM binding specifically at the trailing edge, providing a spatial control mechanism for adhesion disassembly. Microtubule networks also contribute to the regulation of rear-edge retraction and polarity.
cell trailing edge and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CDC42 | Impaired keratinocyte migration and wound healing | Knockout and point-mutation keratinocyte lines |
| ITGBL1 | Cancer cell migration and invasion | Overexpression and knockout cancer cell lines |
| RAB35 | Migrasome-related intercellular communication | Knockout and knock-in models for migrasome formation |
| Integrins | Adhesion-dependent migration in cancer | Point-mutation knock-in to alter ECM binding |
| Microtubule subunits | Migration defects in development | Knockout and tagged knock-in for live imaging |
Cancer invasion and metastasis
Efficient cell migration is a prerequisite for cancer invasion and metastasis, and trailing edge components such as ITGBL1 and Cdc42 influence migration persistence and adhesion turnover. Altered rear-edge dynamics may therefore contribute to the invasive capacity of tumor cells.
Developmental disorders
Neuronal migration and gastrulation require coordinated front-rear polarity, and defects in trailing edge retraction can impair these processes. Genes regulating rear-edge actin and adhesion are therefore candidate contributors to developmental migration disorders.
Impaired wound healing
Keratinocyte migration is essential for wound re-epithelialization, and Cdc42 activity at the trailing edge is required for persistent directional migration of these cells. Disruption of trailing edge signaling may delay wound closure.
From cell trailing edge-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is Cdc42 required for persistent directional migration at the trailing edge? | CDC42 knockout and point-mutation keratinocytes |
| Does ITGBL1 inhibit integrin-ECM binding specifically at the trailing edge? | ITGBL1 overexpression and knockout cell lines |
| How does Rab35 regulate migrasome formation at the trailing edge? | RAB35 knockout and knock-in models |
| Is endoplasmic reticulum incorporated into retraction fibers in a contact-dependent manner? | Tagged knock-in of ER markers for live imaging |
| What is the role of actin dynamics in rear-edge retraction? | Actin tagged knock-in and cofilin overexpression |
| How do microtubules organize trailing edge retraction? | Microtubule subunit knockout and tagged knock-in |
How to Study the cell trailing edge Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live-cell fluorescence imaging | Dynamics of retraction fibers and migrasomes | Visualizing trailing edge structures in real time |
| Adhesion assays | Integrin-ECM binding at the trailing edge | Testing ITGBL1 function in adhesion turnover |
| Migrasome isolation | Composition of trailing edge vesicles | Biochemical analysis of migrasome components |
| CRISPR knockout | Loss-of-function effects on migration | Testing Cdc42 requirement at the trailing edge |
| CRISPR point mutation | Specific residue contributions to adhesion | Dissecting integrin regulation at the rear |
| CRISPR knock-in | Tagged protein localization | Tracking ER incorporation into retraction fibers |
| Overexpression | Gain-of-function effects on migration | Testing ITGBL1 sufficiency in promoting migration |
| Library screening | Identification of novel trailing edge regulators | High-throughput discovery of rear-edge genes |
Live-cell imaging of trailing edge dynamics
Live-cell fluorescence microscopy with tagged actin, integrins, or ER markers allows visualization of retraction fibers and migrasomes at the trailing edge. This approach is essential for tracking rear-edge retraction and adhesion disassembly in real time.
Adhesion turnover assays
Quantifying integrin-ECM binding at the trailing edge using adhesion assays reveals how proteins such as ITGBL1 regulate rear-edge detachment. These assays can be combined with knockout or overexpression models to test causality.
Migrasome and retraction fiber isolation
Isolation and characterization of migrasomes and retraction fibers enable biochemical analysis of their composition, including ER content and Rab35-dependent formation.
CRISPR-based perturbation and screening
CRISPR knockout, point mutation, and knock-in models allow precise testing of trailing edge gene function, while library screening can identify novel regulators of rear-edge migration.
How CRISPR Can Be Used to Study GO:0031254 cell trailing edge
Knockout
CRISPR knockout of trailing edge genes such as CDC42 or ITGBL1 can reveal their requirement for persistent directional migration and adhesion turnover. Knockout models are foundational for establishing causality in rear-edge biology.
Point Mutation
Point mutations in integrin or Cdc42 residues can dissect specific molecular interactions at the trailing edge without eliminating protein expression. This approach is valuable for separating adhesion regulation from other functions.
Knock-in
Knock-in of fluorescent tags into genes such as actin, ER markers, or Rab35 enables live imaging of trailing edge structures and migrasome formation. Tagged knock-in lines provide physiological expression levels for accurate localization studies.
Overexpression
Overexpression of ITGBL1 or other rear-edge regulators can test sufficiency in promoting migration and altering adhesion dynamics. Overexpression models complement knockout studies to establish bidirectional causality.
How EDITGENE Supports cell trailing edge Research
Researchers studying cell trailing edge-related genes often need to determine whether a candidate gene is causally involved in rear-edge retraction, adhesion disassembly, or migrasome formation. EDITGENE provides end-to-end CRISPR services to generate precisely engineered cell models for such studies.
Contact EDITGENE today to design your custom CRISPR model for cell trailing edge research.
Frequently Asked Questions About cell trailing edge
What is GO:0031254 cell trailing edge?
GO:0031254 cell trailing edge is the area of a motile cell opposite to the direction of movement, also known as the back of the cell or trailing edge.
What genes are involved in cell trailing edge?
Genes implicated in trailing edge function include CDC42, ITGBL1, RAB35, actin, integrins, and microtubule subunits.
Why is the trailing edge important for cell migration?
The trailing edge coordinates rear retraction and adhesion disassembly, which are required for persistent directional migration.
How is Cdc42 involved in the trailing edge?
Cdc42 activity at the trailing edge is required for persistent directional migration of keratinocytes.
What is the role of ITGBL1 at the trailing edge?
ITGBL1 promotes cell migration by preferentially inhibiting integrin-ECM binding at the trailing edge.
What are migrasomes and how do they relate to the trailing edge?
Migrasomes are vesicles that form at the trailing edge on retraction fibers, regulated by the phosphatidylinositol (4,5)-bisphosphate-Rab35 axis.
How can I study the trailing edge experimentally?
Live-cell imaging, adhesion assays, migrasome isolation, and CRISPR perturbation are common methods to study the trailing edge.
What diseases are linked to trailing edge dysfunction?
Trailing edge dysfunction is linked to cancer invasion, developmental migration disorders, and impaired wound healing.
What CRISPR models are available for trailing edge research?
Knockout, point mutation, knock-in, and overexpression models can be generated for trailing edge genes such as CDC42, ITGBL1, and RAB35.
How does the trailing edge differ from the leading edge?
The trailing edge is the rear of the cell opposite the direction of movement and is specialized for retraction and adhesion disassembly, whereas the leading edge drives protrusion.
Conclusion
GO:0031254 cell trailing edge is an active cellular compartment that coordinates rear-edge retraction, adhesion disassembly, and migrasome formation during migration. Key regulators such as Cdc42, ITGBL1, and Rab35 have been experimentally linked to trailing edge function, and their dysfunction is relevant to cancer, development, and wound healing. CRISPR-based models provide powerful tools to dissect these mechanisms and identify new therapeutic targets.
References
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- 2. Jang DG et al.. 2022. Integrin β-like 1 protein (ITGBL1) promotes cell migration by preferentially inhibiting integrin-ECM binding at the trailing edge.. Genes Genomics 44(4):405-413 PMID: 35066808
- 3. Lambert de Rouvroit C et al.. 2001. Neuronal migration.. Mech Dev 105(1-2):47-56 PMID: 11429281
- 4. Wada M et al.. 2018. Actin-mediated movement of chloroplasts.. J Cell Sci 131(2) PMID: 29378837
- 5. Huang Y et al.. 2018. Cell migration in the Xenopus gastrula.. Wiley Interdiscip Rev Dev Biol 7(6):e325 PMID: 29944210
- 6. Etienne-Manneville S. 2013. Microtubules in cell migration.. Annu Rev Cell Dev Biol 29:471-99 PMID: 23875648
- 7. Patwardhan R et al.. 2024. Cdc42 activity in the trailing edge is required for persistent directional migration of keratinocytes.. Mol Biol Cell 35(1):br1 PMID: 37910204
- 8. Fan P et al.. 2025. Contact-dependent incorporation of endoplasmic reticulum into retraction fibers and migrasomes.. J Cell Biol 224(12) PMID: 41196236
