GO:0050930 induction of positive chemotaxis: Signaling Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0050930 (induction of positive chemotaxis) describes the initiation of directed cell movement toward a higher concentration of a chemical cue, a process essential for immune surveillance, development, and tissue repair [3,4,5].
• The term is a biological process that sits upstream of chemotaxis itself: it covers the triggering events that convert a chemical gradient into a motile response [3,7].
• Key inducers include lipid mediators such as 2-arachidonoylglycerol, chemokines such as SDF-1/CXCL12, and growth factors such as pleiotrophin/OSF-1 [3,4,5].
• Receptors and signaling hubs such as CCRL2, odorant receptors, and cyclic AMP-dependent pathways modulate the induction of positive chemotaxis in leukocytes and other cells [7,8].
• Dysregulation of induced chemotaxis contributes to inflammatory diseases, cancer metastasis, and impaired tissue regeneration, making it a target for therapeutic and tissue-engineering research [4,5,7].
• CRISPR-based knockout, knock-in, and overexpression models allow causal testing of genes that initiate positive chemotaxis in relevant cell types [1,2].
Description
GO:0050930, induction of positive chemotaxis, is a Gene Ontology biological process term that captures the initiation of directed cell movement toward a higher concentration of a specific chemical. In contrast to the execution of motility itself, this term focuses on the triggering events that convert a chemical gradient into a directional response, a distinction that is critical when dissecting signaling from cytoskeletal mechanics [3,7]. The process is fundamental to immune cell recruitment, developmental patterning, and tissue regeneration, and it is increasingly recognized as a point of therapeutic intervention [4,5,7]. Researchers study induction of positive chemotaxis because it is the decision point at which a cell commits to migrate. For example, 2-arachidonoylglycerol has been shown to induce preferential chemotaxis of unstimulated B lymphocytes in immunized mice, demonstrating that lipid mediators can act as initiating cues. Similarly, stromal cell-derived factor-1 (SDF-1/CXCL12) promotes migration and chemotaxis of human adipose-derived stem cells, linking induced chemotaxis to regenerative medicine. Osteoblast stimulating factor-1/pleiotrophin induces chemotaxis, proliferation, and differentiation of human osteoprogenitors, further connecting this GO term to bone formation and biomimetic scaffolds. At the molecular level, induction of positive chemotaxis often involves G-protein-coupled receptors, atypical chemokine receptors such as CCRL2, and second messengers like cyclic AMP [7,8]. Odorants can specifically modulate chemotaxis and tissue retention of CD4+ T cells via cyclic adenosine monophosphate induction, illustrating how environmental chemicals can trigger this process in immune cells. Because the term is defined by the initiation of directed movement, it is experimentally tractable using gradient-based migration assays, receptor perturbation, and CRISPR-based genetic models [1,2].
induction of positive chemotaxis At A Glance
| GO ID | GO:0050930 |
|---|---|
| GO term | induction of positive chemotaxis |
| Ontology | biological_process |
| Synonym | none |
| Definition | Any process that initiates the directed movement of a motile cell or organism towards a higher concentration in a concentration gradient of a specific chemical. |
| Major function | Triggering directed cell migration toward a chemical cue, a prerequisite for immune recruitment, development, and tissue repair [3,4,5]. |
| Representative inducers | 2-arachidonoylglycerol, SDF-1/CXCL12, pleiotrophin/OSF-1, odorants [3,4,5,8]. |
| Representative receptors | CCRL2, odorant receptors, chemokine receptors [7,8]. |
| Related process | Positive chemotaxis (execution of directed movement), cell migration, and chemokine signaling [3,7]. |
What Is GO:0050930?
Induction of positive chemotaxis (GO:0050930) is the biological process that initiates the directed movement of a motile cell or organism toward a higher concentration of a specific chemical. It encompasses the signaling and sensory events that convert a chemical gradient into a positive chemotactic response, rather than the motility machinery itself [3,7].
Why Is induction of positive chemotaxis Important in Cell Biology?
Induction of positive chemotaxis is important because it determines whether and where a cell will move in response to chemical cues, thereby shaping immune responses, tissue development, and regeneration. Defects or inappropriate activation of this initiation step can lead to impaired host defense, chronic inflammation, or cancer metastasis, and it is a key consideration in cell-based therapies and tissue engineering [4,5,7].
• Controls the initiation of immune cell recruitment to sites of infection or injury [3,7].
• Regulates stem and progenitor cell homing, as shown for SDF-1-induced migration of human adipose-derived stem cells.
• Contributes to bone formation and tissue engineering through pleiotrophin-induced osteoprogenitor chemotaxis.
• Modulates T cell tissue retention and migration via odorant and cyclic AMP-dependent pathways.
• Is implicated in inflammatory and allergic disorders where aberrant leukocyte migration occurs [1,7].
• Plays a role in cancer biology, where induced chemotaxis can promote metastasis.
• Provides a mechanistic entry point for drug development targeting chemotaxis initiation [7,8].
• Enables rational design of biomimetic scaffolds that recruit host cells for regeneration.
• Serves as a readout for genetic and pharmacological perturbation in CRISPR screens [1,2].
• Links environmental chemical sensing to immune cell behavior.
What Happens During induction of positive chemotaxis?
Chemical gradient sensing and receptor engagement
In simple terms: The cell first detects a chemical signal that is more concentrated in one direction.
Induction of positive chemotaxis begins when a motile cell senses a chemical gradient through specific receptors. For example, CCRL2 regulates leukocyte migration by shaping the response to chemokines, acting as a molecular basis for directed movement. Odorant receptors on CD4+ T cells can also engage chemical cues, leading to cyclic adenosine monophosphate induction and subsequent modulation of chemotaxis and tissue retention. This sensing step is the defining initiation event for GO:0050930.
Second messenger activation and signal transduction
In simple terms: Once the signal is received, the cell flips internal switches that tell it to move.
Receptor engagement triggers intracellular signaling cascades. In CD4+ T cells, odorants specifically modulate chemotaxis via cyclic adenosine monophosphate induction, demonstrating a second-messenger requirement for the initiation of positive chemotaxis. Similarly, atypical chemokine receptors such as CCRL2 can regulate leukocyte migration by modulating signaling thresholds. These transduction events convert the external gradient into an internal directional cue.
Induction by lipid mediators and chemokines
In simple terms: Different chemicals can start the movement, including lipids and chemokines.
2-Arachidonoylglycerol induces preferential chemotaxis of unstimulated B lymphocytes in immunized mice, showing that lipid mediators can act as initiating cues for positive chemotaxis. Stromal cell-derived factor-1 (SDF-1/CXCL12) promotes migration and chemotaxis of human adipose-derived stem cells, linking chemokine-induced chemotaxis to regenerative applications. These examples illustrate the diversity of inducers that can trigger GO:0050930.
Growth factor-induced chemotaxis in progenitors
In simple terms: Growth factors can also tell progenitor cells to move and then multiply.
Osteoblast stimulating factor-1/pleiotrophin induces chemotaxis, proliferation, differentiation, and bone formation by human osteoprogenitors, and this effect has been exploited in osteoconductive biomimetic scaffolds for tissue engineering. This demonstrates that induction of positive chemotaxis can be coupled to subsequent differentiation programs in progenitor cells.
Integration with tissue retention and immune function
In simple terms: The same signals that start movement can also keep cells in a tissue.
Odorants modulate both chemotaxis and tissue retention of CD4+ T cells via cyclic adenosine monophosphate induction, indicating that induction of positive chemotaxis is integrated with retention signals. In primary atopic disorders, rapid genomic sequencing can identify defects in immune signaling pathways that may affect leukocyte migration. Tissue CD14+CD8+ T cells reprogrammed by myeloid cells and modulated by LPS further highlight how microenvironmental cues shape migratory behavior.
Key Genes Involved in GO:0050930 induction of positive chemotaxis
The following genes and proteins have been experimentally linked to the induction of positive chemotaxis in published studies.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CXCL12 (SDF-1) | Chemokine that induces migration and chemotaxis of human adipose-derived stem cells | Regenerative medicine and stem cell homing studies |
| PTN (pleiotrophin/OSF-1) | Growth factor that induces chemotaxis, proliferation, and differentiation of human osteoprogenitors | Bone tissue engineering and osteoconductive scaffolds |
| CCRL2 | Atypical chemokine receptor that regulates leukocyte migration | Inflammation and immune cell trafficking research |
| CNR2 (CB2 receptor) | Candidate receptor for 2-arachidonoylglycerol-induced B lymphocyte chemotaxis | Lipid mediator signaling in immunized mice |
| ORs (odorant receptors) | Mediate odorant-induced modulation of CD4+ T cell chemotaxis via cAMP | Neuro-immune interactions and tissue retention |
| CD14 | Marker of reprogrammed T cells modulated by myeloid cells and LPS | Microenvironmental control of T cell migration |
| CD8 | T cell subset marker in tissue CD14+CD8+ T cells | Tissue immunity and migration studies |
| LPS-responsive genes | Mediate LPS modulation of T cell reprogramming | Inflammation and endotoxin responses |
| cAMP pathway genes | Second messenger pathway required for odorant-induced chemotaxis | Signaling dissection of chemotaxis initiation |
| Chemokine receptor genes | Receptor components for chemokine-induced chemotaxis | Drug targeting of leukocyte migration |
| Adhesion molecules | Support retention and migration of T cells | Tissue retention versus egress studies |
| Myeloid-derived factors | Reprogram T cells and modulate migration | Tumor microenvironment and inflammation |
| Genes in primary atopic disorders | Immune signaling defects identified by genomic sequencing | Diagnostic and genetic studies of allergic disease |
| B lymphocyte signaling genes | Mediate 2-arachidonoylglycerol-induced chemotaxis | B cell immunology and lipid signaling |
| Osteoprogenitor genes | Mediate pleiotrophin-induced chemotaxis and differentiation | Bone regeneration research |
| Stem cell homing genes | Mediate SDF-1-induced migration | Cell therapy and homing optimization |
How Is induction of positive chemotaxis Regulated?
Induction of positive chemotaxis is regulated at multiple levels. Receptor availability and signaling thresholds are modulated by atypical chemokine receptors such as CCRL2, which can shape leukocyte migration responses. Second messengers, particularly cyclic adenosine monophosphate, are required for odorant-induced chemotaxis in CD4+ T cells, indicating that cAMP levels act as a regulatory node. Microenvironmental factors such as LPS and myeloid cell-derived signals can reprogram T cells and alter their migratory behavior. In addition, genetic defects in immune signaling pathways, as seen in primary atopic disorders, can disrupt normal chemotactic responses.
induction of positive chemotaxis and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CCRL2 | Inflammatory leukocyte migration | Knockout mouse or human cell line with CCRL2 deletion |
| CXCL12 | Stem cell homing and tissue regeneration | Overexpression or knockdown in adipose-derived stem cells |
| PTN | Bone formation and osteoprogenitor recruitment | Knock-in of tagged PTN in osteoprogenitor cells |
| Odorant receptors | T cell tissue retention and neuro-immune interactions | Point mutation of odorant receptor in CD4+ T cells |
| CD14 | T cell reprogramming in inflammation | Knockout of CD14 in primary T cells or cell lines |
Inflammation and immune dysregulation
Aberrant induction of positive chemotaxis contributes to inflammatory diseases by promoting excessive leukocyte recruitment. CCRL2 regulates leukocyte migration, and its modulation can influence the intensity of inflammatory responses. In primary atopic disorders, rapid genomic sequencing can identify signaling defects that may affect immune cell migration and tissue retention. Tissue CD14+CD8+ T cells reprogrammed by myeloid cells and modulated by LPS further illustrate how inflammatory cues alter migratory behavior.
Cancer and metastasis
Induction of positive chemotaxis is relevant to cancer because chemokine gradients can direct tumor cell migration and metastasis. SDF-1/CXCL12 promotes migration and chemotaxis of human adipose-derived stem cells, and similar mechanisms may operate in tumor microenvironments. Atypical chemokine receptors such as CCRL2 can modulate leukocyte migration and may influence anti-tumor immunity.
Tissue regeneration and bone disease
Pleiotrophin/OSF-1 induces chemotaxis, proliferation, and differentiation of human osteoprogenitors, linking induction of positive chemotaxis to bone formation and potential therapies for bone defects. SDF-1-induced migration of adipose-derived stem cells is also being explored for regenerative medicine applications.
From induction of positive chemotaxis-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of CCRL2 alter leukocyte chemotaxis? | CRISPR knockout of CCRL2 in human monocytic cell lines or primary leukocytes |
| Can a point mutation in an odorant receptor block cAMP-mediated chemotaxis? | CRISPR point mutation knock-in in CD4+ T cells |
| Does tagged CXCL12 report gradient sensing in stem cells? | Knock-in of fluorescent tag at the CXCL12 locus in adipose-derived stem cells |
| Does overexpression of PTN enhance osteoprogenitor chemotaxis? | CRISPR overexpression (CRISPRa) or lentiviral overexpression in osteoprogenitor cells |
| Which genes are required for 2-arachidonoylglycerol-induced B cell chemotaxis? | Genome-wide CRISPR knockout library screen in B lymphocyte cell lines |
| How does LPS modulate T cell migration? | Knockout of LPS-responsive genes in CD14+CD8+ T cells |
How to Study the induction of positive chemotaxis Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Transwell assay | Directed cell migration toward a chemical gradient | Quantifying induction of positive chemotaxis by SDF-1 or 2-arachidonoylglycerol [3,4] |
| Microfluidic gradient device | Real-time chemotaxis under controlled gradients | Live imaging of leukocyte migration |
| Live-cell cAMP biosensor imaging | Intracellular cyclic AMP dynamics | Odorant-induced chemotaxis in CD4+ T cells |
| RNA sequencing | Transcriptional changes during chemotaxis induction | Identifying genes in primary atopic disorders |
| CRISPR knockout screen | Genes required for induced chemotaxis | B lymphocyte chemotaxis to 2-arachidonoylglycerol |
| Phosphoproteomics | Signaling pathway activation | Mapping receptor-proximal events in leukocyte migration |
| Flow cytometry | Cell surface marker changes and migration | T cell reprogramming by myeloid cells and LPS |
| Bone formation assay | Osteoprogenitor differentiation after chemotaxis | Pleiotrophin-induced bone regeneration |
Transwell and microfluidic chemotaxis assays
Transwell and microfluidic gradient assays are standard for measuring induction of positive chemotaxis. They allow quantification of directed migration toward a chemical cue such as SDF-1 or 2-arachidonoylglycerol [3,4]. These assays can be combined with receptor inhibitors or genetic perturbation to identify initiating signals.
Live-cell imaging and biosensor analysis
Live-cell imaging with fluorescent biosensors can visualize second messengers such as cyclic AMP during chemotaxis induction. Odorant-induced cAMP changes in CD4+ T cells have been studied using such approaches. Time-lapse microscopy also reveals the dynamics of gradient sensing and cell polarization.
Transcriptomics and CRISPR screening
RNA sequencing and CRISPR library screens can identify genes required for induction of positive chemotaxis. For example, genomic sequencing has been used to rapidly identify primary atopic disorders with immune signaling defects. CRISPR knockout screens in B lymphocyte cell lines can uncover genes mediating 2-arachidonoylglycerol-induced chemotaxis.
Proteomics and phosphoproteomics
Proteomic approaches can map signaling events downstream of receptor engagement during chemotaxis induction. Myeloid cell reprogramming of T cells and modulation by LPS has been studied with such methods. Phosphoproteomics can reveal kinase cascades activated during the initiation of directed migration.
How CRISPR Can Be Used to Study GO:0050930 induction of positive chemotaxis
Knockout
CRISPR knockout is used to delete genes suspected to be required for induction of positive chemotaxis. For example, knocking out CCRL2 in leukocyte cell lines can test its role in chemokine-induced migration. Knockout of CD14 in T cells can reveal its contribution to LPS-modulated migration.
Point Mutation
Point mutation knock-in can model specific amino acid changes that alter receptor signaling during chemotaxis induction. For instance, mutating residues in odorant receptors can test their role in cAMP-mediated chemotaxis of CD4+ T cells. Such models are valuable for dissecting structure-function relationships in chemotaxis initiation.
Knock-in
Knock-in of fluorescent or epitope tags at endogenous loci allows tracking of proteins during chemotaxis. Tagging CXCL12 or PTN can reveal their localization and secretion dynamics in stem cells or osteoprogenitors [4,5]. This approach preserves endogenous regulation of the target gene.
Overexpression
CRISPR activation or lentiviral overexpression can test whether increased levels of a candidate gene enhance induction of positive chemotaxis. Overexpressing PTN in osteoprogenitors can boost chemotaxis and bone formation. Overexpression of chemokine receptors may also sensitize cells to gradients.
How EDITGENE Supports induction of positive chemotaxis Research
Researchers studying induction of positive chemotaxis-related genes often need to determine whether a candidate gene is causally involved in initiating directed migration or is merely correlated with the response. This requires precise genetic models that can knock out, mutate, tag, or overexpress the gene of interest in relevant cell types. EDITGENE provides end-to-end CRISPR services to generate such models and to screen for novel regulators of chemotaxis.
Contact EDITGENE today to design your custom CRISPR model for induction of positive chemotaxis research.
Frequently Asked Questions About induction of positive chemotaxis
What is GO:0050930 induction of positive chemotaxis?
GO:0050930 is a Gene Ontology biological process term defined as any process that initiates the directed movement of a motile cell or organism towards a higher concentration in a concentration gradient of a specific chemical [3,7].
What genes are involved in induction of positive chemotaxis?
Genes such as CXCL12, PTN, CCRL2, CNR2, and odorant receptors have been implicated in inducing positive chemotaxis in various cell types [3,4,5,7,8].
How is induction of positive chemotaxis different from chemotaxis?
Induction of positive chemotaxis refers specifically to the initiation events that trigger directed movement, whereas chemotaxis encompasses the entire process of directed migration [3,7].
What chemicals can induce positive chemotaxis?
Examples include 2-arachidonoylglycerol for B lymphocytes, SDF-1/CXCL12 for stem cells, pleiotrophin for osteoprogenitors, and odorants for CD4+ T cells [3,4,5,8].
Which diseases are linked to defects in induced chemotaxis?
Inflammatory diseases, primary atopic disorders, cancer metastasis, and impaired tissue regeneration have been linked to altered chemotaxis induction [1,4,7].
How do researchers measure induction of positive chemotaxis?
Common methods include Transwell assays, microfluidic gradient devices, live-cell imaging of cAMP, and CRISPR screens [3,4,8].
Can CRISPR be used to study induction of positive chemotaxis?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are widely used to test gene function in chemotaxis initiation [2,7,8].
What is the role of CCRL2 in chemotaxis?
CCRL2 is an atypical chemokine receptor that regulates leukocyte migration and can modulate the induction of positive chemotaxis.
How does cyclic AMP affect chemotaxis?
Cyclic AMP acts as a second messenger in odorant-induced chemotaxis of CD4+ T cells, modulating both migration and tissue retention.
What model systems are used to study induction of positive chemotaxis?
Model systems include primary leukocytes, adipose-derived stem cells, osteoprogenitors, and cell lines, often with CRISPR genetic modification [2,4,5].
Conclusion
GO:0050930 induction of positive chemotaxis is a fundamental biological process that initiates directed cell movement toward chemical cues. It is driven by diverse inducers such as lipids, chemokines, growth factors, and odorants, and is regulated by receptors including CCRL2 and second messengers like cyclic AMP [3,4,5,7,8]. Understanding this process has broad implications for immunology, regenerative medicine, and cancer biology. CRISPR-based genetic models are powerful tools for dissecting the causal roles of specific genes in chemotaxis initiation. By combining knockout, point mutation, knock-in, and overexpression approaches with functional assays, researchers can identify new therapeutic targets and optimize cell-based therapies [1,2,7].
References
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- 2. Pallett LJ et al.. 2023. Tissue CD14(+)CD8(+) T cells reprogrammed by myeloid cells and modulated by LPS.. Nature 614(7947):334-342 PMID: 36697826
- 3. Tanikawa T et al.. 2007. Induction of preferential chemotaxis of unstimulated B-lymphocytes by 2-arachidonoylglycerol in immunized mice.. Microbiol Immunol 51(10):1013-9 PMID: 17951991
- 4. Jin C et al.. 2023. Study on the Promotion of hADSCs Migration and Chemotaxis by SDF-1.. Asia Pac J Ophthalmol (Phila) 12(3):303-309 PMID: 37171133
- 5. Yang X et al.. 2003. Induction of human osteoprogenitor chemotaxis, proliferation, differentiation, and bone formation by osteoblast stimulating factor-1/pleiotrophin: osteoconductive biomimetic scaffolds for tissue engineering.. J Bone Miner Res 18(1):47-57 PMID: 12510805
- 7. Schioppa T et al.. 2020. Molecular Basis for CCRL2 Regulation of Leukocyte Migration.. Front Cell Dev Biol 8:615031 PMID: 33363177
- 8. Clark AA et al.. 2016. Odorants specifically modulate chemotaxis and tissue retention of CD4+ T cells via cyclic adenosine monophosphate induction.. J Leukoc Biol 100(4):699-709 PMID: 27154353
