GO:0005010 insulin-like growth factor receptor activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0005010 (insulin-like growth factor receptor activity) is a molecular function defined as combining with an insulin-like growth factor receptor ligand and transmitting the signal across the plasma membrane to initiate a change in cell activity.
• The term is associated with receptor tyrosine kinases such as IGF1R and INSR, which autophosphorylate upon ligand binding and initiate intracellular signaling cascades.
• Insulin-like growth factor receptor signaling is a central regulator of cell growth, survival, proliferation, and metabolism, and its dysregulation is implicated in cancer, metabolic disorders, and regenerative processes.
• Key downstream pathways include the PI3K-AKT and MAPK cascades, which control translation, proliferation, and apoptosis.
• Research on this activity employs knockout, point-mutation, knock-in, and overexpression models, alongside CRISPR screening and bioinformatics.
• Therapeutic targeting of insulin-like growth factor receptor signaling is under investigation for breast cancer, thyroid-associated ophthalmopathy, and other conditions.
Description
GO:0005010, insulin-like growth factor receptor activity, is a molecular function that enables a receptor to bind an insulin-like growth factor (IGF) ligand and transmit a signal across the plasma membrane, thereby initiating changes in cell behavior. This activity is fundamental to how cells sense and respond to growth factors, and it is mediated primarily by receptor tyrosine kinases such as the insulin-like growth factor 1 receptor (IGF1R) and the insulin receptor (INSR). The importance of this term for researchers lies in its broad impact on normal physiology and disease: it regulates cell proliferation, survival, differentiation, and metabolism, and its aberrant activation contributes to cancer progression, metabolic syndromes, and immune-related pathologies. Understanding the molecular details of insulin-like growth factor receptor activity is therefore critical for developing targeted therapies and for interpreting genomic and proteomic data in both basic and clinical research.
insulin-like growth factor receptor activity At A Glance
| GO ID | GO:0005010 |
|---|---|
| GO term | insulin-like growth factor receptor activity |
| Ontology | molecular_function |
| Synonym | IGF-activated receptor activity; IGF receptor activity; insulin-like growth factor-activated receptor activity |
| Definition | Combining with insulin-like growth factor receptor ligand and transmitting the signal across the plasma membrane to initiate a change in cell activity. |
| Major function | Ligand-activated receptor signaling that initiates intracellular cascades controlling growth, survival, and metabolism. |
| Related receptors | IGF1R, INSR, and hybrid receptors. |
| Signaling pathways | PI3K-AKT, MAPK, and mTOR pathways. |
| Disease relevance | Cancer, metabolic disorders, thyroid-associated ophthalmopathy, and regenerative processes. |
What Is GO:0005010?
In simple terms, insulin-like growth factor receptor activity is the ability of a cell-surface receptor to catch an IGF signal outside the cell and pass that message inside, causing the cell to change its behavior. According to the Gene Ontology, this molecular function is defined as combining with an insulin-like growth factor receptor ligand and transmitting the signal across the plasma membrane to initiate a change in cell activity. It includes the ligand-binding event, receptor activation, and the initiation of downstream signaling, and it is distinct from the downstream signaling events themselves.
Why Is insulin-like growth factor receptor activity Important in Cell Biology?
Insulin-like growth factor receptor activity is a cornerstone of cellular communication because it translates extracellular growth signals into coordinated changes in gene expression, metabolism, and cell fate. Its dysregulation is directly linked to major human diseases, including multiple cancers where receptor overexpression or hyperactivation drives proliferation and survival. Moreover, this activity is essential for normal development and tissue regeneration, as shown in zebrafish fin regeneration where IGF receptor/mTOR signaling elevates global translation to accelerate outgrowth. Consequently, researchers across oncology, endocrinology, and regenerative medicine need to understand and manipulate this activity to identify therapeutic targets and biomarkers.
• Regulates cell proliferation, survival, and differentiation through PI3K-AKT and MAPK pathways.
• Controls global protein synthesis and translation via mTOR signaling.
• Implicated in breast cancer progression and endocrine resistance.
• Plays a role in thyroid-associated ophthalmopathy, an autoimmune eye disease.
• Involved in neuroprotection through CX3CL1 intracellular domain signaling.
• Serves as a target for biomarker discovery using gene expression profiling.
• Essential for tissue regeneration and regenerative outgrowth in model organisms.
• Provides a paradigm for understanding receptor tyrosine kinase signaling mechanisms.
• Offers opportunities for combination therapies in oncology.
• Enables CRISPR-based functional genomics to dissect signaling networks.
What Happens During insulin-like growth factor receptor activity?
Ligand Binding and Receptor Activation
In simple terms: First, the receptor grabs the growth factor outside the cell, which turns the receptor on.
Insulin-like growth factor receptor activity begins when an IGF ligand binds to the extracellular domain of a receptor tyrosine kinase such as IGF1R or INSR. This binding induces conformational changes that lead to receptor autophosphorylation on intracellular tyrosine residues, activating the kinase domain. The activated receptor then serves as a docking site for adaptor proteins, initiating downstream signaling.
Intracellular Signal Transduction
In simple terms: Once activated, the receptor passes the message to a relay of proteins inside the cell.
Activated IGF receptors recruit and phosphorylate adaptor proteins such as IRS-1, which in turn activate the PI3K-AKT and MAPK cascades. These pathways transmit the signal to downstream effectors that regulate gene expression, metabolism, and cell survival. The specificity and strength of the signal can be modulated by receptor isoform composition and post-translational modifications.
Downstream Cellular Responses
In simple terms: The relayed message changes how the cell behaves, such as growing, dividing, or surviving.
Signaling downstream of insulin-like growth factor receptor activity culminates in diverse cellular responses, including increased protein synthesis, cell cycle progression, and inhibition of apoptosis. In zebrafish fin regeneration, IGF receptor/mTOR signaling elevates global translation to accelerate regenerative outgrowth. In cancer cells, these responses can drive uncontrolled proliferation and resistance to therapy.
Signal Termination and Regulation
In simple terms: The cell also has ways to switch the signal off to avoid overgrowth.
Insulin-like growth factor receptor activity is tightly regulated by negative feedback mechanisms, including receptor internalization, dephosphorylation by phosphatases, and degradation. Dysregulation of these control mechanisms can lead to sustained signaling, which is a hallmark of many cancers. Understanding these regulatory nodes is essential for therapeutic intervention.
Key Genes Involved in GO:0005010 insulin-like growth factor receptor activity
The following genes and proteins are central to insulin-like growth factor receptor activity and its downstream signaling.
| Gene | Major Role | Research Relevance |
|---|---|---|
| IGF1R | Receptor tyrosine kinase that binds IGF1 and IGF2 and initiates signaling | Primary mediator of IGF activity; target in cancer and growth disorders |
| INSR | Insulin receptor that also binds IGFs with lower affinity; forms hybrid receptors with IGF1R | Metabolic regulation and crosstalk with IGF signaling |
| IGF1 | Ligand that activates IGF1R | Major growth factor; studied in development and cancer |
| IGF2 | Ligand that activates IGF1R and INSR-A | Implicated in fetal growth and tumorigenesis |
| IRS1 | Adaptor protein phosphorylated by activated receptors | Key node in PI3K-AKT signaling; biomarker in cancer |
| IRS2 | Adaptor protein in insulin/IGF signaling | Metabolic and growth regulation |
| PIK3CA | Catalytic subunit of PI3K | Downstream effector; frequently mutated in cancer |
| AKT1 | Serine/threonine kinase | Central survival kinase downstream of IGF signaling |
| MTOR | Kinase that regulates translation and growth | Integrates IGF signals to control protein synthesis |
| MAPK1 | Extracellular signal-regulated kinase 2 | Transmits proliferative signals from IGF receptors |
| MAPK3 | Extracellular signal-regulated kinase 1 | Transmits proliferative signals from IGF receptors |
| GRB2 | Adaptor protein linking receptor to RAS-MAPK pathway | Mediates mitogenic signaling |
| SOS1 | Guanine nucleotide exchange factor for RAS | Activates MAPK cascade downstream of IGF1R |
| HRAS | Small GTPase | Proto-oncogene in IGF signaling |
| PTEN | Lipid phosphatase that antagonizes PI3K | Tumor suppressor; negative regulator of IGF signaling |
| FOXO1 | Transcription factor inhibited by AKT | Mediates IGF effects on metabolism and survival |
| CX3CL1 | Chemokine with intracellular domain that modulates IGF signaling | Neuroprotection via IGF receptor signaling |
How Is insulin-like growth factor receptor activity Regulated?
Insulin-like growth factor receptor activity is regulated at multiple levels. Ligand availability is controlled by IGF-binding proteins (IGFBPs), which sequester IGFs and modulate receptor activation. Receptor levels and activity are influenced by transcriptional regulation, alternative splicing, and post-translational modifications such as phosphorylation and ubiquitination. Negative feedback loops involving phosphatases (e.g., PTEN) and receptor internalization prevent excessive signaling. Additionally, crosstalk with other signaling pathways, such as the epidermal growth factor receptor (EGFR) pathway, can modulate IGF receptor activity in cancer cells. The mTOR pathway integrates IGF receptor signals to regulate translation and cell growth, as demonstrated in zebrafish fin regeneration.
insulin-like growth factor receptor activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| IGF1R | Breast cancer, thyroid-associated ophthalmopathy | Knockout or point-mutation in cancer cell lines; xenograft models |
| INSR | Metabolic disorders, cancer | Knockout mice; cell-based assays |
| IGF2 | Tumorigenesis, overgrowth syndromes | Overexpression models; CRISPR knock-in |
| PTEN | Cancer predisposition, metabolic syndrome | Knockout models; CRISPR screening |
| CX3CL1 | Neurodegeneration | Knock-in or overexpression in neuronal cells |
Cancer
Insulin-like growth factor receptor activity is frequently dysregulated in cancer, where it promotes proliferation, survival, and metastasis. In breast cancer, IGF receptor signaling interacts with estrogen receptor activity and EGFR/HER2 pathways, contributing to endocrine resistance. Targeting IGF receptor signaling, alone or in combination with other therapies, is an active area of clinical investigation. Gene expression profiling has been used to identify biomarkers of IGF receptor pathway activation in tumors.
Thyroid-Associated Ophthalmopathy
The IGF-I receptor plays a role in thyroid-associated ophthalmopathy, an autoimmune condition affecting the orbit. Studies suggest that IGF-I receptor signaling contributes to the pathogenesis of the disease, and targeting this receptor is being explored as a therapeutic strategy.
Metabolic and Regenerative Disorders
Insulin-like growth factor receptor activity is integral to metabolic regulation and tissue regeneration. In zebrafish, IGF receptor/mTOR signaling elevates global translation to accelerate fin regenerative outgrowth, highlighting its role in regenerative processes. Dysregulation of this activity has been implicated in metabolic syndromes and growth disorders.
Neuroprotection
The CX3CL1 intracellular domain exhibits neuroprotection via insulin receptor/IGF receptor signaling, suggesting a role for this activity in neuronal survival. This opens potential avenues for therapeutic intervention in neurodegenerative conditions.
From insulin-like growth factor receptor activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of IGF1R affect cell proliferation? | IGF1R knockout cell lines generated by CRISPR |
| How do point mutations in the kinase domain alter signaling? | Point-mutation knock-in models |
| What is the effect of IGF2 overexpression on tumor growth? | IGF2 overexpression models |
| Can a tagged IGF1R be used to track receptor dynamics? | Tagged knock-in (e.g., GFP) |
| Which genes modulate sensitivity to IGF receptor inhibitors? | CRISPR library screening |
| How does IGF receptor signaling affect translation globally? | Ribo-seq and polysome profiling in knockout models |
How to Study the insulin-like growth factor receptor activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Global gene expression changes | Identify downstream targets of IGF receptor signaling |
| Ribo-seq | Translated mRNA footprints | Measure translation efficiency upon IGF receptor activation |
| Phosphoproteomics | Phosphorylation sites on proteins | Map signaling networks downstream of IGF1R |
| CRISPR knockout | Loss-of-function phenotypes | Determine gene essentiality in IGF signaling |
| CRISPR point mutation | Specific amino acid changes | Study kinase domain mutations in IGF1R |
| CRISPR knock-in | Tagged or reporter alleles | Track receptor localization and dynamics |
| CRISPR overexpression | Gain-of-function phenotypes | Model IGF2-driven tumorigenesis |
| CRISPR library screening | Pooled gene perturbations | Identify modifiers of IGF receptor inhibitor response |
Genomic and Transcriptomic Profiling
RNA-seq and microarray analysis can reveal changes in gene expression upon modulation of insulin-like growth factor receptor activity. Gene expression profiling has been used to develop biomarkers from IGF receptor pathway activation in cancer. These methods help identify downstream targets and feedback mechanisms.
Proteomic and Phosphoproteomic Analysis
Mass spectrometry-based proteomics can quantify phosphorylation events on IGF receptors and downstream effectors, providing a snapshot of pathway activity. This approach is useful for mapping signaling networks and identifying novel substrates.
Functional Genomics with CRISPR
CRISPR knockout, point-mutation, knock-in, and overexpression models enable precise manipulation of genes involved in insulin-like growth factor receptor activity. CRISPR library screening can identify genes that modulate sensitivity to IGF receptor inhibitors, revealing resistance mechanisms.
Imaging and Live-Cell Assays
Fluorescence microscopy and live-cell imaging of tagged receptors can visualize receptor trafficking, internalization, and interactions in real time. These methods complement biochemical assays to provide spatial and temporal understanding of signaling.
How CRISPR Can Be Used to Study GO:0005010 insulin-like growth factor receptor activity
Knockout
CRISPR knockout of IGF1R or INSR can abolish insulin-like growth factor receptor activity, allowing researchers to study loss-of-function phenotypes such as reduced proliferation or altered metabolism. Knockout models are essential for validating the role of specific receptors in disease.
Point Mutation
Introducing point mutations in the kinase domain of IGF1R or INSR via CRISPR can mimic clinically observed mutations, enabling structure-function studies and drug resistance research. These models help dissect the contribution of specific residues to receptor activation.
Knock-in
CRISPR knock-in can be used to add tags (e.g., GFP, HA) to endogenous IGF1R or to introduce reporter genes, facilitating real-time imaging and biochemical purification. Knock-in of disease-associated alleles can model human conditions in cell lines or animals.
Overexpression
CRISPR activation (CRISPRa) or traditional overexpression constructs can drive high-level expression of IGF1R, INSR, or their ligands, modeling gain-of-function states observed in cancer. Overexpression models are useful for studying oncogenic signaling and testing targeted therapies.
How EDITGENE Supports insulin-like growth factor receptor activity Research
Researchers studying insulin-like growth factor receptor activity-related genes often need to determine whether a candidate gene is causally involved in signaling, disease, or therapeutic response. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell models, enabling rigorous functional validation and drug discovery.
Contact EDITGENE today to design your custom CRISPR model for insulin-like growth factor receptor activity research.
Frequently Asked Questions About insulin-like growth factor receptor activity
What is insulin-like growth factor receptor activity?
It is a molecular function defined by GO:0005010, where a receptor binds an IGF ligand and transmits a signal across the plasma membrane to initiate cellular changes.
What genes are involved in insulin-like growth factor receptor activity?
Key genes include IGF1R, INSR, IGF1, IGF2, IRS1, IRS2, PIK3CA, AKT1, MTOR, and MAPK1/3, among others.
What diseases are associated with insulin-like growth factor receptor activity?
It is implicated in cancers such as breast cancer, thyroid-associated ophthalmopathy, metabolic disorders, and neuroprotection.
How is insulin-like growth factor receptor activity regulated?
It is regulated by ligand availability, IGF-binding proteins, receptor phosphorylation, internalization, and negative feedback via phosphatases like PTEN.
What are the downstream pathways of insulin-like growth factor receptor activity?
The main pathways are PI3K-AKT and MAPK, which control proliferation, survival, and metabolism.
How can I study insulin-like growth factor receptor activity in the lab?
Common methods include CRISPR knockout/knock-in, RNA-seq, phosphoproteomics, and Ribo-seq to measure signaling and translation.
What is the role of IGF1R in cancer?
IGF1R is a receptor tyrosine kinase that drives proliferation and survival in many cancers and is a target for therapy.
Can CRISPR be used to model insulin-like growth factor receptor mutations?
Yes, CRISPR point mutation and knock-in can introduce specific mutations to study receptor function and drug resistance.
What is the connection between insulin-like growth factor receptor activity and mTOR?
IGF receptor signaling activates mTOR, which elevates global translation to promote growth and regeneration.
How does EDITGENE support research on insulin-like growth factor receptor activity?
EDITGENE provides CRISPR knockout, point mutation, knock-in, overexpression, library screening, and bioinformatics services tailored to IGF signaling.
Conclusion
Insulin-like growth factor receptor activity (GO:0005010) is a fundamental molecular function that governs cell growth, survival, and metabolism through receptor tyrosine kinases such as IGF1R and INSR. Its dysregulation is central to cancer, metabolic disorders, and other diseases, making it a prime target for therapeutic intervention and biomarker discovery. Advances in CRISPR-based models and functional genomics are accelerating our understanding of this pathway and enabling the development of precision therapies.
References
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- 3. Gee JM et al.. 2005. Epidermal growth factor receptor/HER2/insulin-like growth factor receptor signalling and oestrogen receptor activity in clinical breast cancer.. Endocr Relat Cancer 12 Suppl 1:S99-S111 PMID: 16113104
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- 6. Boone DN et al.. 2012. Targeting the insulin-like growth factor receptor: developing biomarkers from gene expression profiling.. Crit Rev Oncog 17(2):161-73 PMID: 22471706
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