GO:0032868 response to insulin: Signaling Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0032868 (response to insulin) describes any cellular or organismal change triggered by insulin, a polypeptide hormone from pancreatic islets.
• Insulin is best known for controlling blood glucose, primarily by stimulating glucose uptake in skeletal muscle and adipose tissue.
• The response to insulin involves rapid signaling events (phosphorylation cascades) and slower transcriptional and metabolic reprogramming.
• Dysregulation of insulin response underlies type 1 diabetes, type 2 diabetes, and contributes to cardiovascular and immune disorders [2,7].
• Model organisms such as Drosophila and rodents are used to dissect conserved insulin/IGF signaling components.
• CRISPR-based knockout, knock-in, and overexpression models enable causal testing of genes in the insulin response pathway [1,6].
Description
GO:0032868, response to insulin, is a biological process defined as any change in cell or organism state (movement, secretion, enzyme production, gene expression, etc.) resulting from an insulin stimulus. Insulin is a polypeptide hormone produced by the islets of Langerhans in mammals and by homologous organs in other organisms. This process is central to metabolic homeostasis, growth, and survival, and its dysfunction is a hallmark of diabetes and related metabolic diseases. Researchers study response to insulin to understand how cells sense and adapt to nutrient status, and to identify therapeutic targets for metabolic disorders [1,7]. The pathway is highly conserved, with insulin-like peptides and signaling components found from Drosophila to humans. Experimental models, including CRISPR-edited cell lines and animal models, are essential for dissecting the molecular players and causal relationships in this response [1,6].
response to insulin At A Glance
| GO ID | GO:0032868 |
|---|---|
| GO term | response to insulin |
| Ontology | biological_process |
| Synonym | response to insulin stimulus |
| Major function | Cellular and organismal adaptation to insulin, including glucose uptake, metabolism, and gene expression |
| Definition source | QuickGO definition: Any process that results in a change in state or activity of a cell or an organism as a result of an insulin stimulus |
| Related diseases | Type 1 diabetes, type 2 diabetes, insulin resistance, metabolic syndrome [2,7] |
| Model organisms | Human, mouse, rat, Drosophila [1,8] |
| Key signaling nodes | Insulin receptor (INSR), IRS proteins, PI3K/AKT, MAPK [1,5] |
What Is GO:0032868?
In our own words, response to insulin (GO:0032868) encompasses all molecular, cellular, and physiological changes that occur when a cell or organism detects insulin. This includes immediate signaling events such as receptor autophosphorylation and kinase cascades, as well as downstream effects on glucose transport, lipid synthesis, protein synthesis, gene expression, and secretion [1,5]. The response can be cell-type specific; for example, skeletal muscle increases glucose uptake, while liver modulates gluconeogenesis and lipogenesis. The term also covers insulin-like peptides in invertebrates, reflecting evolutionary conservation.
Why Is response to insulin Important in Cell Biology?
Understanding response to insulin is fundamental to metabolism, endocrinology, and disease research. Insulin is the primary anabolic hormone that lowers blood glucose, and its failure leads to diabetes mellitus, a global health burden. The response to insulin also intersects with immunity, inflammation, and cancer biology, making it a broad research area. Moreover, insulin-like peptides in model organisms provide insights into conserved growth and nutrient-sensing pathways. Therefore, studying GO:0032868 helps identify therapeutic targets and biomarkers for metabolic diseases.
• Regulates blood glucose homeostasis by promoting glucose uptake in muscle and fat.
• Controls hepatic glucose production, lipid synthesis, and protein metabolism.
• Dysfunction causes insulin resistance, a precursor to type 2 diabetes.
• Autoimmune destruction of insulin-producing beta cells leads to type 1 diabetes.
• Insulin acts as an immunomodulatory hormone, linking metabolism and immunity.
• Conserved insulin/IGF signaling in Drosophila regulates growth and development.
• Target for glucose-responsive insulin therapeutics in diabetes.
• Involved in endothelial function and microvascular insulin resistance.
• Second messengers such as inositol phosphoglycans mediate some insulin actions.
• CRISPR screens can identify novel regulators of insulin response.
What Happens During response to insulin?
Insulin Binding and Receptor Activation
In simple terms: Insulin docks onto its receptor on the cell surface, switching it on.
Insulin binds to the insulin receptor (INSR), a tetrameric receptor tyrosine kinase, triggering autophosphorylation and activation of its intrinsic kinase activity. This leads to phosphorylation of insulin receptor substrates (IRS1-4) and recruitment of downstream signaling molecules. In Drosophila, insulin-like peptides Dilp2 and Dilp6 show divergent responses to dietary sugar and protein, indicating conserved but nuanced regulation.
PI3K/AKT Pathway Activation
In simple terms: A relay of proteins inside the cell passes the signal to control metabolism and survival.
Activated IRS proteins recruit PI3K, which generates PIP3, leading to AKT activation via PDK1 and mTORC2. AKT phosphorylates AS160, promoting GLUT4 translocation to the plasma membrane and glucose uptake in muscle and adipose tissue. This pathway also regulates glycogen synthesis, protein synthesis, and cell survival.
MAPK Cascade and Gene Expression
In simple terms: Another branch of the signal reaches the nucleus to change which genes are active.
Insulin also activates the Ras-MAPK pathway through Grb2/SOS, leading to ERK1/2 activation and regulation of transcription factors such as Elk1. This branch influences cell proliferation, differentiation, and gene expression programs. Additionally, insulin second messengers like inositol phosphoglycans can mediate specific metabolic effects.
Metabolic and Transcriptional Reprogramming
In simple terms: The cell adjusts its metabolism and gene activity to store energy and grow.
Downstream of AKT, mTORC1 promotes protein synthesis and lipogenesis, while FOXO transcription factors are inhibited, reducing gluconeogenic gene expression. Insulin also modulates the expression of genes involved in glucose and lipid metabolism, partly through SREBP and ChREBP. In immune cells, insulin can act as an immunomodulatory hormone, affecting cytokine production and immune cell function.
Key Genes Involved in GO:0032868 response to insulin
The following genes and proteins are central to the response to insulin, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| INSR | Insulin receptor tyrosine kinase; initiates signaling upon insulin binding | Mutations cause severe insulin resistance syndromes; target for CRISPR KO in cell models |
| IRS1 | Docking protein for INSR; activates PI3K and MAPK pathways | Polymorphisms linked to type 2 diabetes; KO models show insulin resistance |
| IRS2 | Alternative IRS isoform; important in liver and beta cells | KO mice develop diabetes; used in knock-in studies |
| PIK3CA | Catalytic subunit of PI3K; generates PIP3 | Oncogenic mutations; KO affects glucose uptake |
| AKT1 | Serine/threonine kinase; mediates metabolic effects | KO impairs glucose uptake; point mutations studied in cancer |
| AKT2 | AKT isoform critical for insulin action in muscle and liver | KO mice exhibit insulin resistance; relevant for diabetes research |
| GLUT4 (SLC2A4) | Insulin-responsive glucose transporter | Translocation to membrane is hallmark of insulin response; KO blocks glucose uptake |
| FOXO1 | Transcription factor inhibited by AKT; regulates gluconeogenesis | KO alters hepatic glucose production; target for CRISPR KO |
| mTOR | Kinase in mTORC1/2; promotes protein synthesis and growth | Inhibited by rapamycin; KO affects insulin sensitivity |
| SREBF1 | Transcription factor regulating lipogenesis | Insulin activates SREBP-1c; KO reduces lipid synthesis |
| Dilp2 | Drosophila insulin-like peptide 2 | Responds to dietary sugar; used in fly genetics |
| Dilp6 | Drosophila insulin-like peptide 6 | Responds to dietary protein; divergent from Dilp2 |
| INS | Insulin gene; encodes preproinsulin | Mutations cause neonatal diabetes; CRISPR knock-in for tagged insulin |
| PTPN1 | Protein tyrosine phosphatase 1B; negative regulator of insulin signaling | KO enhances insulin sensitivity; drug target |
| TBC1D4 (AS160) | Rab GAP; regulates GLUT4 translocation | Phosphorylated by AKT; KO impairs glucose uptake |
| RPS6KB1 | p70S6 kinase; downstream of mTORC1 | Regulates protein synthesis; KO affects insulin response |
| GRB2 | Adaptor protein in MAPK pathway | KO disrupts ERK signaling; used in signaling studies |
| SHC1 | Adaptor protein linking INSR to Ras/MAPK | KO reduces MAPK activation; relevant for insulin action |
How Is response to insulin Regulated?
The response to insulin is tightly regulated by feedback mechanisms. Negative regulators include protein tyrosine phosphatases such as PTPN1, which dephosphorylate the insulin receptor and IRS proteins, attenuating signaling. Lipid phosphatases like PTEN and SHIP2 hydrolyze PIP3, dampening AKT activation. Serine phosphorylation of IRS1 by kinases such as JNK, IKK, and mTORC1 can induce insulin resistance. Conversely, positive regulators include adaptor proteins and second messengers like inositol phosphoglycans. In Drosophila, nutritional status modulates Dilp2 and Dilp6 expression, showing environmental regulation. Understanding these regulatory layers is crucial for targeting insulin resistance therapeutically.
response to insulin and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| INSR | Donohue syndrome, Rabson-Mendenhall syndrome, insulin resistance | CRISPR KO in HepG2 or myotubes; knock-in of patient mutations |
| IRS1 | Type 2 diabetes susceptibility, insulin resistance | KO and point-mutation knock-in in cell lines |
| AKT2 | Severe insulin resistance, lipodystrophy | KO mice; CRISPR KO in adipocytes |
| INS | Neonatal diabetes, type 1 diabetes | Knock-in of tagged insulin for imaging; KO in beta cell lines |
| PTPN1 | Insulin resistance, obesity | KO and overexpression in hepatocytes and adipocytes |
Type 1 Diabetes Mellitus
Type 1 diabetes results from autoimmune destruction of pancreatic beta cells, leading to absolute insulin deficiency and loss of response to insulin in target tissues. Patients require exogenous insulin to maintain glucose homeostasis. Research focuses on preserving beta cell function and improving insulin delivery, including glucose-responsive insulin analogs.
Type 2 Diabetes and Insulin Resistance
Type 2 diabetes is characterized by insulin resistance in skeletal muscle, liver, and adipose tissue, combined with relative insulin deficiency. Defects in insulin signaling, such as reduced INSR or IRS1 function, contribute to disease. Metformin, a first-line therapy, improves insulin sensitivity partly by reducing oxidative stress and microvascular insulin resistance.
Metabolic Syndrome and Cardiovascular Disease
Insulin resistance is a core feature of metabolic syndrome, which increases risk for cardiovascular disease. Endothelial insulin resistance impairs vasodilation and contributes to hypertension and atherosclerosis. Insulin's immunomodulatory actions also link metabolic dysfunction to chronic inflammation.
Insulin Signaling in Cancer and Other Disorders
Dysregulated insulin/IGF signaling can promote cancer cell proliferation and survival. Additionally, rare mutations in INSR cause severe insulin resistance syndromes such as Donohue syndrome. Understanding these connections may reveal therapeutic opportunities.
From response to insulin-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X regulate glucose uptake? | CRISPR KO in skeletal muscle cells (e.g., C2C12) followed by glucose uptake assay |
| Does mutation Y affect insulin receptor signaling? | Point-mutation knock-in in HEK293 or patient fibroblasts |
| Where is protein Z localized during insulin stimulation? | Tagged knock-in (e.g., GFP) in cell lines; imaging |
| Does overexpression of gene W cause insulin resistance? | Overexpression via lentiviral transduction in adipocytes |
| What is the role of gene V in whole-body metabolism? | KO mouse models; hyperinsulinemic-euglycemic clamp |
| Can we identify novel regulators of insulin response? | Genome-wide CRISPR library screening in insulin-responsive cells |
How to Study the response to insulin Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Phosphoproteomics | Global phosphorylation changes | Identify insulin signaling substrates |
| Glucose uptake assay | Rate of glucose transport | Assess insulin sensitivity in cells |
| RNA-seq | Transcriptional changes | Discover insulin-regulated genes |
| Live-cell imaging | Protein localization dynamics | Track GLUT4 translocation |
| CRISPR screen | Gene essentiality or regulators | Find novel insulin response genes |
| Western blot | Protein expression and phosphorylation | Validate signaling activation |
| Co-immunoprecipitation | Protein-protein interactions | Study receptor complexes |
| Metabolic flux analysis | Metabolic pathway activity | Measure insulin effects on metabolism |
Phosphoproteomics
Phosphoproteomics allows global profiling of insulin-induced phosphorylation events, identifying substrates of INSR, AKT, and mTOR. This method can reveal novel signaling nodes and feedback loops in response to insulin.
Glucose Uptake Assays
Radiolabeled or fluorescent glucose analogs measure insulin-stimulated glucose uptake in cells and tissues. This is a direct functional readout of the response to insulin in muscle and fat cells.
Transcriptomics (RNA-seq)
RNA sequencing after insulin stimulation identifies gene expression changes regulated by insulin, such as gluconeogenic or lipogenic genes. It can be combined with CRISPR KO to assess gene function.
Live-Cell Imaging
Tagged proteins (e.g., GLUT4-GFP) enable real-time visualization of translocation events in response to insulin. This method provides spatial and temporal resolution of the response.
How CRISPR Can Be Used to Study GO:0032868 response to insulin
Knockout
CRISPR knockout of candidate genes (e.g., INSR, IRS1, AKT2) in insulin-responsive cell lines can determine their requirement for insulin-stimulated glucose uptake and signaling. Pooled KO screens enable unbiased discovery of novel regulators.
Point Mutation
Introducing disease-associated point mutations (e.g., INSR mutations) via CRISPR base editing or HDR allows study of their impact on receptor function and downstream signaling. This approach models patient-specific mutations in isogenic backgrounds.
Knock-in
Knock-in of tags (e.g., GFP, HA) into endogenous loci (e.g., GLUT4, IRS1) enables visualization and biochemical analysis of proteins under native regulation. This is valuable for tracking insulin-induced translocation.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression can drive supraphysiological expression of genes to test gain-of-function effects on insulin response, such as inducing insulin resistance.
How EDITGENE Supports response to insulin Research
Researchers studying response to insulin-related genes often need to determine whether a candidate gene is causally involved in insulin signaling, glucose uptake, or metabolic regulation. EDITGENE provides comprehensive CRISPR-based services to create precisely engineered cell and animal models, enabling rigorous functional validation.
Contact EDITGENE today to design your custom CRISPR model for response to insulin research.
Frequently Asked Questions About response to insulin
What is GO:0032868 response to insulin?
GO:0032868 is a Gene Ontology biological process term describing any change in a cell or organism caused by an insulin stimulus, including signaling, metabolic, and transcriptional changes.
What genes are involved in response to insulin?
Key genes include INSR, IRS1, IRS2, PIK3CA, AKT1, AKT2, GLUT4 (SLC2A4), FOXO1, and mTOR, among others.
How does insulin signaling work?
Insulin binds to the insulin receptor, activating a phosphorylation cascade involving IRS proteins, PI3K, AKT, and MAPK, leading to glucose uptake and metabolic changes [1,5].
What diseases are associated with defective response to insulin?
Type 1 diabetes, type 2 diabetes, insulin resistance, metabolic syndrome, and rare insulin receptor mutations like Donohue syndrome [1,2].
What model organisms are used to study response to insulin?
Common models include mice, rats, and Drosophila, which have conserved insulin/IGF signaling components [1,8].
How can CRISPR be used to study response to insulin?
CRISPR knockout, knock-in, point mutation, and overexpression can test the causal role of genes in insulin signaling and glucose uptake.
What is the role of GLUT4 in response to insulin?
GLUT4 is an insulin-responsive glucose transporter that translocates to the cell membrane upon insulin stimulation, increasing glucose uptake in muscle and fat.
What are insulin second messengers?
Insulin second messengers include inositol phosphoglycans and other molecules that mediate some metabolic effects of insulin independently of phosphorylation cascades.
How is response to insulin regulated?
It is regulated by feedback phosphorylation/dephosphorylation, lipid phosphatases (PTEN, SHIP2), and serine kinases that can induce insulin resistance.
What methods are used to study response to insulin?
Common methods include phosphoproteomics, glucose uptake assays, RNA-seq, live-cell imaging, and CRISPR screens.
Conclusion
GO:0032868 response to insulin is a fundamental biological process that controls glucose homeostasis, metabolism, and growth. Its dysregulation is central to diabetes and metabolic syndrome, making it a key area for therapeutic development [1,2]. Advances in CRISPR technology and multi-omics approaches are accelerating the discovery of novel regulators and drug targets [1,6]. Continued research into this process will inform new strategies for treating insulin resistance and related disorders.
References
- 1. Sylow L et al.. 2021. The many actions of insulin in skeletal muscle, the paramount tissue determining glycemia.. Cell Metab 33(4):758-780 PMID: 33826918
- 2. Powers AC. 2021. Type 1 diabetes mellitus: much progress, many opportunities.. J Clin Invest 131(8) PMID: 33759815
- 3. Liu J et al.. 2022. Metformin prevents endothelial oxidative stress and microvascular insulin resistance during obesity development in male rats.. Am J Physiol Endocrinol Metab 322(3):E293-E306 PMID: 35128961
- 5. Strålfors P. 1997. Insulin second messengers.. Bioessays 19(4):327-35 PMID: 9136630
- 6. Liu Y et al.. 2024. Recent Progress in Glucose-Responsive Insulin.. Diabetes 73(9):1377-1388 PMID: 38857114
- 7. van Niekerk G et al.. 2020. Insulin as an immunomodulatory hormone.. Cytokine Growth Factor Rev 52:34-44 PMID: 31831339
- 8. Suzawa M et al.. 2025. The insulin-like peptides Dilp2 and Dilp6 exhibit divergent responses to dietary sugar and protein in Drosophila larvae.. Proc Natl Acad Sci U S A 122(42):e2426930122 PMID: 41091757
