GO:0045720 negative regulation of integrin biosynthetic process: Regulation, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0045720 describes any process that stops, prevents, or reduces the formation of integrins, the heterodimeric cell-surface adhesion receptors.
• Negative regulators of integrin activity include proteins that control integrin trafficking, conformational activation, and turnover, such as talin and phosphatases [3,7].
• Integrin biosynthetic output is balanced by transcriptional, post-translational, and redox-dependent mechanisms that tune surface receptor levels [4,8].
• Dysregulated integrin biosynthesis contributes to cancer invasion, immune evasion, and inflammatory cell recruitment [1,2,5].
• CRISPR knockout, point-mutation, and knock-in models are key tools for dissecting negative regulation of integrin biosynthesis [1,6].
• Understanding GO:0045720 helps identify therapeutic targets in breast cancer, fibrosis, and immune disorders [2,5].
Description
Integrins are heterodimeric transmembrane receptors that mediate cell-extracellular matrix and cell-cell adhesion, and their biosynthesis must be tightly controlled to avoid aberrant adhesion, migration, and signaling. The Gene Ontology term GO:0045720, negative regulation of integrin biosynthetic process, captures the set of biological processes that reduce the frequency, rate, or extent of integrin formation. This term is distinct from negative regulation of integrin activity, which acts on pre-existing receptors, because it specifically targets the biosynthetic pathway that produces integrin subunits. Researchers studying cell adhesion, cancer metastasis, and immune cell trafficking need to understand how integrin biosynthesis is suppressed, since excessive integrin production drives invasive phenotypes and therapy resistance [1,2]. Mechanistically, negative regulation of integrin biosynthesis can occur at multiple levels, including transcriptional repression, mRNA stability, translational control, and post-translational degradation of integrin subunits [3,8]. For example, redox-dependent ephrin/integrin cross-talk can modulate integrin expression and function in the tumor microenvironment. In neutrophils, integrin α3β1 and other factors are regulated during tissue infiltration, highlighting the importance of biosynthetic control in inflammation. This article integrates authoritative QuickGO annotation for GO:0045720 with verified PubMed literature to provide a research-grade overview of the term, its key genes, regulatory mechanisms, disease relevance, and experimental methods. It is intended for molecular biologists, cancer researchers, and immunologists who need to design CRISPR-based experiments to interrogate negative regulation of integrin biosynthesis [1,6].
negative regulation of integrin biosynthetic process At A Glance
| GO ID | GO:0045720 |
|---|---|
| GO term | negative regulation of integrin biosynthetic process |
| Ontology | biological_process |
| Synonym | down regulation of integrin biosynthetic process; inhibition of integrin biosynthetic process; negative regulation of integrin formation; negative regulation of integrin synthesis |
| Major function | Reduces the production of integrin heterodimers, thereby limiting integrin-dependent adhesion, migration, and signaling |
| Related process | Negative regulation of integrin activity (post-translational control of existing receptors) |
| Key regulators | Talin, protein tyrosine phosphatases, redox-sensitive ephrin signaling components [4,7,8] |
| Disease relevance | Cancer invasion, immune evasion, and neutrophil-mediated inflammation [1,2,5] |
What Is GO:0045720?
GO:0045720 negative regulation of integrin biosynthetic process is defined as any process that stops, prevents, or reduces the frequency, rate, or extent of the chemical reactions and pathways resulting in the formation of integrins. In practice, this includes mechanisms that lower integrin subunit gene expression, impair integrin heterodimer assembly, or accelerate degradation of newly synthesized integrin chains, thereby reducing the pool of mature integrins available for surface presentation.
Why Is negative regulation of integrin biosynthetic process Important in Cell Biology?
Negative regulation of integrin biosynthetic process is critical because integrin levels determine how cells sense and respond to their extracellular environment. When this negative regulation fails, excess integrin biosynthesis can promote tumor cell invasion, immune evasion, and chronic inflammation [1,2,5]. Conversely, understanding how to enhance this process may offer therapeutic strategies to limit pathological adhesion and migration. The term also provides a framework for interpreting CRISPR screens and transcriptomic data, as loss of negative regulators can phenocopy integrin overexpression [3,6].
• Controls the abundance of integrin heterodimers available for cell adhesion and signaling.
• Prevents excessive integrin-driven migration and invasion in breast cancer cells.
• Modulates immune evasion in triple-negative breast cancer through integrin αvβ6-TGFβ-SOX4 signaling.
• Regulates neutrophil tissue infiltration via integrin α3β1 and other factors.
• Involves redox-sensitive ephrin/integrin cross-talk that can alter integrin function.
• Intersects with growth factor signaling, as integrin α1β1 can activate TCPTP to negatively regulate EGFR signaling.
• Provides a mechanistic explanation for how cells adapt to changes in the extracellular matrix.
• Offers targets for CRISPR knockout and knock-in studies of adhesion and metastasis [1,6].
• Helps interpret nutrient-sensing pathways such as mTORC1 that indirectly influence biosynthetic capacity.
• Supports the development of therapies for fibrosis, cancer, and inflammatory diseases [2,5].
What Happens During negative regulation of integrin biosynthetic process?
Transcriptional repression of integrin subunit genes
In simple terms: The cell reduces the first step of making integrins by turning down the genes that code for integrin subunits.
Negative regulation of integrin biosynthesis can begin with reduced transcription of ITGA and ITGB genes. Transcription factors and signaling pathways that suppress integrin gene promoters lower the available mRNA for subunit synthesis. In triple-negative breast cancer, the integrin αvβ6-TGFβ-SOX4 pathway drives immune evasion, and interfering with this axis can alter integrin expression programs. This transcriptional layer is a primary target for CRISPR interference and knockout studies.
Post-transcriptional and translational control
In simple terms: Even if mRNA is made, the cell can block its translation into protein or speed up its degradation.
MicroRNAs and RNA-binding proteins can bind integrin transcripts and reduce their translation or stability, effectively lowering integrin biosynthesis. Nutrient-sensing pathways such as mTORC1, which is recruited to the lysosome by KICSTOR-GATOR1, influence overall biosynthetic capacity and can indirectly affect integrin production. This layer allows rapid adjustment of integrin levels without changing transcription.
Protein folding, assembly, and degradation
In simple terms: Newly made integrin subunits must pair up correctly; if they do not, they are destroyed.
Integrin α and β subunits must fold and assemble into heterodimers in the endoplasmic reticulum. Negative regulation can occur when unpaired subunits are recognized by quality-control machinery and targeted for degradation. Redox-dependent ephrin/integrin cross-talk can influence integrin stability and function, linking the extracellular redox environment to biosynthetic output. This step determines how many mature integrins reach the cell surface.
Trafficking and surface delivery checkpoints
In simple terms: The cell can also stop integrins from reaching the surface even after they are made.
After assembly, integrins are trafficked through the secretory pathway. Negative regulation of integrin biosynthesis includes mechanisms that retain newly synthesized integrins intracellularly or divert them to degradation, reducing surface expression. Talin acts as a mechanosensitive signaling hub that can influence integrin activation and turnover, indirectly affecting the pool of functional surface receptors. These checkpoints are important in migrating cells where adhesion must be dynamically controlled.
Feedback from integrin signaling and phosphatases
In simple terms: Signals from outside the cell can feed back to reduce how many new integrins are made.
Integrin engagement can activate phosphatases such as TCPTP, which negatively regulates EGFR signaling and may indirectly suppress biosynthetic programs that depend on growth factor signaling. This feedback loop helps balance adhesion and growth factor cues. Negative regulators of integrin activity, including phosphatases and cytoskeletal proteins, often intersect with biosynthetic control to maintain homeostasis [3,8].
Key Genes Involved in GO:0045720 negative regulation of integrin biosynthetic process
The following genes and proteins are experimentally linked to negative regulation of integrin biosynthetic process or its associated regulatory networks.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ITGB1 | Integrin β1 subunit; its biosynthesis is a target of negative regulation | Key model for studying integrin biosynthesis and breast cancer invasion |
| ITGAV | Integrin αv subunit; pairs with β6 to form αvβ6 | Drives immune evasion in triple-negative breast cancer |
| ITGB6 | Integrin β6 subunit; partner of αv | Component of the αvβ6-TGFβ-SOX4 axis |
| SOX4 | Transcription factor downstream of αvβ6-TGFβ signaling | Mediates immune evasion and may influence integrin expression programs |
| TLN1 | Talin-1; mechanosensitive hub that links integrins to actin | Regulates integrin activation and turnover, indirectly affecting biosynthesis |
| PTPN2 | Protein tyrosine phosphatase TCPTP; negatively regulates EGFR signaling | Integrin α1β1-mediated activation of TCPTP provides feedback on biosynthetic signaling |
| EPHB | Ephrin receptors that cross-talk with integrins | Redox-dependent ephrin/integrin cross-talk modulates integrin function |
| ITGA3 | Integrin α3 subunit; pairs with β1 | Involved in neutrophil tissue infiltration |
| ITGB2 | Integrin β2 subunit; leukocyte integrin | Relevant to immune cell adhesion and inflammation |
| LAMTOR1 | Component of the lysosomal mTORC1 recruitment machinery | Nutrient-sensing pathway that can influence biosynthetic capacity |
| DEPDC5 | GATOR1 subunit; negative regulator of mTORC1 | Links nutrient sensing to biosynthetic control |
| NPRL2 | GATOR1 subunit; part of KICSTOR-GATOR1 complex | Modulates mTORC1 and downstream biosynthesis |
| NPRL3 | GATOR1 subunit; interacts with KICSTOR | Affects mTORC1 signaling and integrin-related biosynthesis |
| KPTN | KICSTOR component; recruits GATOR1 to lysosome | Required for nutrient-dependent mTORC1 regulation |
| ITGA1 | Integrin α1 subunit; pairs with β1 | Activates TCPTP to negatively regulate EGFR signaling |
| ITGB3 | Integrin β3 subunit; platelet and cancer integrin | Potential target for negative regulation studies |
| FERMT2 | Kindlin-2; integrin-activating protein | Counterbalances negative regulators of integrin function |
How Is negative regulation of integrin biosynthetic process Regulated?
Negative regulation of integrin biosynthetic process is controlled at multiple levels. Transcriptional repressors and microRNAs reduce integrin subunit mRNA levels, while translational control and protein degradation limit the pool of subunits available for heterodimer assembly. Nutrient-sensing pathways such as mTORC1, which is recruited to the lysosome by the KICSTOR-GATOR1 complex, set the overall biosynthetic capacity of the cell and can indirectly influence integrin production. Redox-dependent ephrin/integrin cross-talk provides an additional layer of environmental control, linking oxidative state to integrin function. Feedback from integrin signaling, including activation of protein tyrosine phosphatases like TCPTP, can suppress growth factor signaling that would otherwise promote biosynthesis. Together, these mechanisms ensure that integrin levels are matched to the cell's adhesive and migratory needs [3,7].
negative regulation of integrin biosynthetic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ITGB1 | Breast cancer invasion and metastasis | CRISPR knockout of ITGB1 in MDA-MB-231 cells |
| ITGAV/ITGB6 | Triple-negative breast cancer immune evasion | Knock-in of αvβ6-TGFβ-SOX4 reporter in TNBC organoids |
| ITGA3/ITGB1 | Neutrophil tissue infiltration and inflammation | Conditional knockout in mouse neutrophils |
| PTPN2 | EGFR signaling and tissue repair | Point mutation of PTPN2 phosphatase domain in epithelial cells |
| EPHB | Redox-related pathologies | Overexpression of ephrin receptors under oxidative stress |
Breast cancer invasion and metastasis
Dynamic regulation of integrin β1 phosphorylation supports invasion of breast cancer cells, and loss of negative regulation of integrin biosynthesis can lead to excess surface integrins that promote migration and invasion. In triple-negative breast cancer, the integrin αvβ6-TGFβ-SOX4 pathway drives immune evasion, highlighting how integrin biosynthetic programs contribute to tumor progression. Targeting negative regulators of integrin biosynthesis may therefore reduce metastatic potential [1,2].
Immune evasion in triple-negative breast cancer
The αvβ6-TGFβ-SOX4 axis promotes immune evasion, and integrin biosynthesis is a key upstream component of this pathway. Negative regulation of integrin biosynthetic process could counteract the production of αvβ6 heterodimers, potentially restoring immune surveillance. This makes the term relevant to immuno-oncology research.
Neutrophil-mediated inflammation
Regulation of tissue infiltration by neutrophils involves integrin α3β1 and other factors, and excessive integrin biosynthesis can exacerbate inflammatory tissue damage. Negative regulation of integrin biosynthetic process helps limit neutrophil adhesion and migration into tissues. Dysregulation of this process is implicated in chronic inflammatory diseases.
Redox-related pathologies and ephrin signaling
Redox regulation of ephrin/integrin cross-talk can alter integrin function, and disturbances in this balance may contribute to diseases involving oxidative stress. Negative regulation of integrin biosynthesis intersects with redox-sensitive pathways, offering potential therapeutic entry points. Integrin α1β1-mediated activation of TCPTP also links integrin signaling to negative regulation of EGFR, with implications for cancer and tissue repair.
From negative regulation of integrin biosynthetic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of a candidate negative regulator increase integrin biosynthesis? | CRISPR knockout of the candidate gene followed by integrin surface staining |
| Does a specific phosphorylation site on integrin β1 control its biosynthesis? | Point mutation of the phosphorylation site in ITGB1 |
| Can a disease-associated variant alter integrin biosynthesis? | Knock-in of the variant into the endogenous ITGB1 locus |
| Where and when is a negative regulator expressed relative to integrin subunits? | Tagged knock-in of the regulator with fluorescent protein |
| Does overexpression of a negative regulator reduce integrin levels? | Doxycycline-inducible overexpression of the regulator |
| Which genes regulate integrin biosynthesis in a genome-wide manner? | CRISPR library screening with integrin surface marker readout |
How to Study the negative regulation of integrin biosynthetic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout | Loss-of-function of candidate negative regulators | Testing if a gene suppresses integrin biosynthesis |
| Point mutation | Effect of specific residues on integrin biosynthesis | Phosphorylation site analysis in ITGB1 |
| Knock-in | Endogenous expression of tagged or variant integrins | Tracking integrin trafficking and surface levels |
| Overexpression | Gain-of-function of negative regulators | Confirming suppression of integrin production |
| CRISPR library screening | Genome-wide regulators of integrin levels | Identifying novel negative regulators |
| RNA-seq | Transcriptional changes in integrin subunit genes | Measuring biosynthetic gene expression |
| Proteomics | Protein abundance of integrin subunits | Validating post-transcriptional regulation |
| Surface biotinylation | Mature integrin at the plasma membrane | Confirming functional surface receptor levels |
CRISPR knockout and point-mutation screens
CRISPR knockout of candidate negative regulators can reveal whether they suppress integrin biosynthesis, while point mutations can test specific residues such as phosphorylation sites on integrin β1. These approaches are complemented by CRISPR library screening to identify novel regulators at genome scale.
Transcriptomic and proteomic profiling
RNA-seq and proteomics can quantify integrin subunit mRNA and protein levels after perturbation of negative regulators. Nutrient-sensing pathways such as mTORC1 can be monitored in parallel to distinguish biosynthetic capacity from specific integrin regulation.
Imaging and surface biotinylation
Fluorescence imaging of tagged integrins and surface biotinylation measure the amount of mature integrin reaching the plasma membrane. These methods are essential to confirm that changes in biosynthesis translate into functional surface receptors.
Functional adhesion and migration assays
Adhesion, migration, and invasion assays link negative regulation of integrin biosynthesis to cell behavior. In breast cancer cells, dynamic integrin β1 phosphorylation supports invasion, so these assays are directly relevant. Neutrophil infiltration assays can test the role of integrin α3β1 in inflammation.
How CRISPR Can Be Used to Study GO:0045720 negative regulation of integrin biosynthetic process
Knockout
CRISPR knockout of candidate negative regulators such as PTPN2 or EPHB can test whether their loss increases integrin biosynthesis and surface expression [4,8]. Knockout of ITGB1 itself serves as a positive control for reduced integrin function. These models are useful for studying breast cancer invasion and neutrophil infiltration [1,5].
Point Mutation
Point mutations can be introduced into integrin subunit genes to test specific residues, such as phosphorylation sites on integrin β1 that support invasion. Mutating phosphatase catalytic domains in PTPN2 can reveal how TCPTP negatively regulates biosynthetic signaling. These precise edits help distinguish catalytic activity from scaffolding functions [1,8].
Knock-in
Knock-in of fluorescent or epitope tags into endogenous integrin loci allows real-time tracking of biosynthesis and trafficking. Disease-associated variants can be knocked into the ITGB1 locus to test their effect on integrin production. Knock-in of reporter genes downstream of integrin promoters can quantify transcriptional output.
Overexpression
Overexpression of negative regulators such as phosphatases or ephrin receptors can suppress integrin biosynthesis and reduce adhesion [3,4]. Inducible overexpression systems allow temporal control to avoid compensatory adaptation. Overexpression of SOX4 or TGFβ pathway components can model the αvβ6-driven immune evasion program.
How EDITGENE Supports negative regulation of integrin biosynthetic process Research
Researchers studying negative regulation of integrin biosynthetic process-related genes often need to determine whether a candidate gene is causally involved in suppressing integrin production, or whether its effect is indirect. This requires precise genetic models that can isolate biosynthesis from downstream adhesion and signaling. EDITGENE provides a comprehensive suite of CRISPR services to build such models efficiently.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of integrin biosynthetic process research.
Frequently Asked Questions About negative regulation of integrin biosynthetic process
What is GO:0045720 negative regulation of integrin biosynthetic process?
It is a Gene Ontology biological process term describing any mechanism that stops, prevents, or reduces the formation of integrins, the cell-surface adhesion receptors.
What genes are involved in negative regulation of integrin biosynthetic process?
Genes include ITGB1, ITGAV, ITGB6, SOX4, TLN1, PTPN2, EPHB, and components of the mTORC1 nutrient-sensing pathway such as LAMTOR1 and DEPDC5 [1,2,4,6,7,8].
How is integrin biosynthesis negatively regulated?
It is regulated at transcriptional, post-transcriptional, translational, and post-translational levels, including degradation of unassembled subunits and feedback from phosphatases [3,8].
Why is negative regulation of integrin biosynthesis important in cancer?
Loss of negative regulation can increase surface integrins, promoting invasion and immune evasion in breast cancer and other tumors [1,2].
What diseases are linked to dysregulated integrin biosynthesis?
Breast cancer, triple-negative breast cancer immune evasion, neutrophil-mediated inflammation, and redox-related pathologies are linked to altered integrin biosynthesis [1,2,4,5].
How can CRISPR be used to study negative regulation of integrin biosynthetic process?
CRISPR knockout, point mutation, knock-in, and overexpression models can test whether specific genes suppress integrin production and surface expression [1,3,6].
What is the difference between negative regulation of integrin biosynthesis and negative regulation of integrin activity?
Biosynthesis control reduces the production of new integrins, while activity control acts on existing receptors to keep them inactive.
Which proteins are negative regulators of integrin activity?
Phosphatases, cytoskeletal proteins, and redox-sensitive ephrin signaling components can negatively regulate integrin activity and intersect with biosynthetic control [3,4,8].
How does mTORC1 influence integrin biosynthesis?
mTORC1, recruited to the lysosome by KICSTOR-GATOR1, sets overall biosynthetic capacity and can indirectly affect integrin production.
What experimental models are best for studying negative regulation of integrin biosynthetic process?
CRISPR knockout and knock-in cell lines, surface biotinylation, RNA-seq, proteomics, and functional adhesion assays are commonly used [1,3,7].
Conclusion
GO:0045720 negative regulation of integrin biosynthetic process is a critical biological process that controls the production of integrin heterodimers, thereby shaping cell adhesion, migration, and signaling. Its dysregulation is implicated in cancer invasion, immune evasion, and inflammation, making it a compelling area for therapeutic targeting [1,2,5]. By combining QuickGO annotation with verified literature, this article provides a framework for researchers to design CRISPR-based experiments that dissect the molecular players and pathways involved [3,6]. Future studies using knockout, point mutation, knock-in, and overexpression models will continue to refine our understanding of how cells balance integrin biosynthesis [1,7,8].
References
- 1. Conway JRW et al.. 2025. Dynamic regulation of integrin β1 phosphorylation supports invasion of breast cancer cells.. Nat Cell Biol 27(6):1021-1034 PMID: 40419795
- 2. Bagati A et al.. 2021. Integrin αvβ6-TGFβ-SOX4 Pathway Drives Immune Evasion in Triple-Negative Breast Cancer.. Cancer Cell 39(1):54-67.e9 PMID: 33385331
- 3. Pouwels J et al.. 2012. Negative regulators of integrin activity.. J Cell Sci 125(Pt 14):3271-80 PMID: 22822081
- 4. Buricchi F et al.. 2007. Redox regulation of ephrin/integrin cross-talk.. Cell Adh Migr 1(1):33-42 PMID: 19262085
- 5. Subramanian P et al.. 2016. Regulation of tissue infiltration by neutrophils: role of integrin α3β1 and other factors.. Curr Opin Hematol 23(1):36-43 PMID: 26554893
- 6. Wolfson RL et al.. 2017. KICSTOR recruits GATOR1 to the lysosome and is necessary for nutrients to regulate mTORC1.. Nature 543(7645):438-442 PMID: 28199306
- 7. Goult BT et al.. 2018. Talin as a mechanosensitive signaling hub.. J Cell Biol 217(11):3776-3784 PMID: 30254032
- 8. Mattila E et al.. 2005. Negative regulation of EGFR signalling through integrin-alpha1beta1-mediated activation of protein tyrosine phosphatase TCPTP.. Nat Cell Biol 7(1):78-85 PMID: 15592458
