GO:0031622 positive regulation of fever generation: Biological Process, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0031622 (positive regulation of fever generation) describes any process that activates or increases the frequency, rate, or extent of fever generation, a core biological process in the acute-phase response.
• Fever generation is driven by pyrogenic cytokines such as interleukin-1, interleukin-6, and tumor necrosis factor, which act on the hypothalamus to raise the thermoregulatory set point.
• Positive regulation of fever generation is clinically relevant across infectious diseases, autoinflammatory disorders, and critical illness, where fever is a diagnostic and prognostic marker [1,3,4].
• Dysregulated fever pathways contribute to conditions such as generalized pustular psoriasis, primary atopic disorders, and fever of unknown origin [2,3,4].
• Modern genomic and metagenomic sequencing approaches are increasingly used to identify the infectious and genetic causes of fever, linking molecular mechanisms to clinical phenotypes [2,4].
• CRISPR-based knockout, knock-in, and overexpression models enable causal testing of candidate genes in fever-generation pathways, accelerating translational research.
Description
Fever is a phylogenetically conserved host defense response characterized by an elevation of the hypothalamic thermoregulatory set point, and it is orchestrated by a complex network of pyrogenic mediators and neural circuits [1,6]. The Gene Ontology term GO:0031622, positive regulation of fever generation, captures the biological processes that activate or increase the frequency, rate, or extent of fever generation. This term is essential for annotating gene products that amplify pyrogenic signaling, including cytokines, prostaglandin synthases, and their receptors, which together convert peripheral immune signals into central thermoregulatory changes. Understanding positive regulation of fever generation is critical because fever is a cardinal sign of infection, inflammation, and autoinflammatory disease, and its intensity often correlates with disease severity [1,3]. In critical care, fever patterns inform diagnosis and management of sepsis and systemic inflammation. In dermatology, fever is a hallmark of generalized pustular psoriasis, where interleukin-36 signaling drives both systemic inflammation and febrile responses. In allergy and immunology, fever can be a presenting feature of primary atopic disorders, and genomic sequencing is increasingly used to identify monogenic causes. In infectious disease, fever of unknown origin remains a diagnostic challenge, and metagenomic next-generation sequencing has improved pathogen detection in such cases. Consequently, researchers studying GO:0031622 aim to dissect the molecular and cellular mechanisms that positively regulate fever, with the ultimate goal of identifying therapeutic targets and biomarkers. This article integrates the QuickGO definition with verified PubMed literature to provide a research-grade overview of the genes, mechanisms, diseases, and experimental models associated with positive regulation of fever generation.
positive regulation of fever generation At A Glance
| GO ID | GO:0031622 |
|---|---|
| GO term | positive regulation of fever generation |
| Ontology | biological_process |
| Synonym | activation of fever; positive regulation of pyrexia; stimulation of fever; up regulation of fever; up-regulation of fever; upregulation of fever |
| Major function | Amplification of pyrogenic signaling leading to elevated body temperature |
| Definition | Any process that activates or increases the frequency, rate, or extent of fever generation. |
| Related process | Fever generation (GO:0006954 and related terms) |
| Clinical relevance | Infectious disease, autoinflammation, critical illness, and fever of unknown origin [1,3,4] |
What Is GO:0031622?
According to the Gene Ontology, GO:0031622 (positive regulation of fever generation) is defined as any process that activates or increases the frequency, rate, or extent of fever generation. In other words, it encompasses molecular events that amplify the production or action of pyrogenic mediators, enhance thermoregulatory set-point elevation, or sustain fever once initiated. This term is a biological process and is distinct from fever generation itself (GO:0006954, acute inflammatory response, and related terms), as it specifically refers to positive regulatory inputs. Synonyms include activation of fever, positive regulation of pyrexia, stimulation of fever, up regulation of fever, up-regulation of fever, and upregulation of fever. The term is used in annotation to describe gene products that promote fever, such as pro-inflammatory cytokines and their downstream effectors.
Why Is positive regulation of fever generation Important in Cell Biology?
Positive regulation of fever generation is a central node in the acute-phase response and a critical determinant of host defense and disease pathology. Fever enhances immune cell function and inhibits pathogen replication, but excessive or prolonged fever can cause tissue damage and is associated with worse outcomes in critical illness. The term GO:0031622 enables systematic annotation of genes that amplify fever, facilitating comparative genomics, pathway analysis, and drug target discovery. Clinically, understanding positive regulation of fever generation is essential for interpreting fever of unknown origin, where metagenomic sequencing can reveal infectious causes, and for managing autoinflammatory diseases such as generalized pustular psoriasis, where interleukin-36 drives febrile flares. In primary atopic disorders, fever can be a diagnostic clue, and genomic sequencing aids in identifying underlying monogenic defects. Thus, research on GO:0031622 bridges molecular immunology, neurobiology, and clinical medicine.
• Fever is a cardinal sign of infection and inflammation, and its positive regulation determines disease severity.
• Pyrogenic cytokines such as IL-1, IL-6, and TNF are key positive regulators of fever generation.
• GO:0031622 annotations help identify gene products that amplify fever, supporting drug target discovery.
• Fever of unknown origin remains a diagnostic challenge, and metagenomic sequencing can identify pathogens.
• Generalized pustular psoriasis features fever and systemic inflammation driven by IL-36 signaling.
• Primary atopic disorders can present with fever, and genomic sequencing enables rapid diagnosis.
• Critical illness often involves dysregulated fever responses, impacting patient management.
• CRISPR models allow causal testing of candidate genes in fever pathways.
• Understanding positive regulation of fever generation informs vaccine adjuvant design and immunotherapy.
• Fever patterns can guide antimicrobial stewardship and infection control [1,4].
What Happens During positive regulation of fever generation?
Initiation by Pyrogenic Cytokines
In simple terms: Immune cells release signals that start the fever response.
Positive regulation of fever generation begins with the release of pyrogenic cytokines, primarily interleukin-1 (IL-1), interleukin-6 (IL-6), and tumor necrosis factor (TNF), from activated immune cells in response to infection or inflammation. These cytokines act as endogenous pyrogens and are essential for initiating the febrile response. Their production is triggered by pathogen-associated molecular patterns and damage-associated molecular patterns, which activate pattern recognition receptors on monocytes, macrophages, and dendritic cells. The magnitude and duration of fever are directly influenced by the levels and potency of these pyrogenic cytokines, making them key positive regulators of GO:0031622.
Prostaglandin E2 Synthesis and Signaling
In simple terms: The cytokines cause the brain to produce a molecule that raises the body's temperature set point.
Following cytokine release, IL-1 and other pyrogens induce the enzyme cyclooxygenase-2 (COX-2) in the brain vasculature, leading to the synthesis of prostaglandin E2 (PGE2). PGE2 acts on EP3 receptors in the preoptic area of the hypothalamus, elevating the thermoregulatory set point and thereby generating fever. This step is a critical positive regulatory node because COX-2 inhibitors (e.g., nonsteroidal anti-inflammatory drugs) block fever by inhibiting PGE2 synthesis. The positive regulation of fever generation thus involves amplification of PGE2 signaling, which directly drives the febrile response.
Neural Circuit Activation and Thermoregulatory Set Point
In simple terms: The brain's thermostat is turned up, causing the body to feel cold and generate heat.
PGE2 binding to EP3 receptors on thermosensitive neurons in the preoptic hypothalamus triggers neural circuits that increase heat production (e.g., shivering, brown adipose tissue thermogenesis) and reduce heat loss (e.g., vasoconstriction). These effector responses are part of the fever generation process, and their positive regulation can occur through enhanced sensitivity of these neural pathways or increased PGE2 availability. The hypothalamic-pituitary-adrenal axis and sympathetic nervous system also modulate fever, and their activation can further amplify the response.
Amplification by Inflammatory Mediators
In simple terms: Other inflammatory molecules can boost the fever signal, making it stronger or longer.
Beyond IL-1, IL-6, and TNF, other mediators such as interleukin-36 (IL-36) and interferon-gamma can positively regulate fever generation in specific contexts. In generalized pustular psoriasis, IL-36 signaling drives systemic inflammation and fever, highlighting how cytokine networks amplify febrile responses. Additionally, complement components and chemokines can enhance immune cell recruitment and cytokine production, indirectly promoting fever. These amplification loops are integral to GO:0031622 and represent potential therapeutic targets [3,6].
Resolution and Negative Feedback
In simple terms: The body also has ways to turn down the fever, but positive regulation focuses on turning it up.
While positive regulation of fever generation is the focus of GO:0031622, it is balanced by negative feedback mechanisms involving anti-inflammatory cytokines (e.g., IL-10) and glucocorticoids. However, dysregulation of these feedback loops can lead to excessive or prolonged fever, as seen in critical illness and autoinflammatory diseases [1,3]. Understanding the interplay between positive and negative regulation is essential for therapeutic modulation of fever.
Key Genes Involved in GO:0031622 positive regulation of fever generation
The following genes and proteins are key players in the positive regulation of fever generation, based on their established roles in pyrogenic signaling and immune responses.
| Gene | Major Role | Research Relevance |
|---|---|---|
| IL1B | Pro-inflammatory cytokine; endogenous pyrogen | Central mediator of fever; target for anti-cytokine therapy |
| IL6 | Pro-inflammatory cytokine; induces acute-phase response | Key pyrogen; elevated in systemic inflammation |
| TNF | Pro-inflammatory cytokine; amplifies inflammation | Contributes to fever in infection and autoimmunity |
| PTGS2 | Cyclooxygenase-2; synthesizes prostaglandin E2 | Target of NSAIDs; critical for fever generation |
| PTGER3 | Prostaglandin E2 receptor EP3 | Mediates hypothalamic fever response |
| IL36G | IL-36 cytokine; drives neutrophilic inflammation | Implicated in generalized pustular psoriasis with fever |
| IL36RN | IL-36 receptor antagonist; regulates IL-36 signaling | Mutations cause autoinflammation and fever |
| IL1RN | IL-1 receptor antagonist; modulates IL-1 activity | Deficiency causes fever syndromes |
| TLR4 | Pattern recognition receptor for LPS | Initiates cytokine release in response to infection |
| MYD88 | Adaptor protein in TLR/IL-1 signaling | Transduces pyrogenic signals |
| NFKB1 | Transcription factor; induces pro-inflammatory genes | Drives cytokine expression in fever |
| NLRP3 | Inflammasome sensor; activates IL-1β | Involved in autoinflammatory fever syndromes |
| CASP1 | Caspase-1; cleaves pro-IL-1β | Essential for IL-1β maturation and fever |
| IL18 | Pro-inflammatory cytokine; synergizes with IL-1 | Contributes to fever in inflammasome activation |
| CXCL8 | Chemokine; recruits neutrophils | Amplifies inflammatory fever responses |
| IFNG | Interferon-gamma; enhances immune activation | Can modulate fever in infections |
| IL10 | Anti-inflammatory cytokine; limits fever | Negative regulator; relevant for fever resolution |
| CD8A | T cell co-receptor; effector T cell function | Studied in context of immune-mediated fever |
How Is positive regulation of fever generation Regulated?
Positive regulation of fever generation is tightly controlled at multiple levels. Transcriptional regulation of pyrogenic cytokines (e.g., IL1B, IL6, TNF) by NF-κB and other transcription factors determines the magnitude of the febrile response. Post-transcriptional mechanisms, including mRNA stability and microRNA regulation, modulate cytokine production. Inflammasome activation, particularly NLRP3, regulates the cleavage of pro-IL-1β and pro-IL-18 into active forms, which are potent pyrogens. Negative feedback by anti-inflammatory cytokines (IL-10, TGF-β) and glucocorticoids limits fever duration. Additionally, neural mechanisms involving the vagus nerve and hypothalamic-pituitary-adrenal axis provide rapid modulation of fever. Dysregulation of these regulatory layers can lead to excessive fever in critical illness or autoinflammatory diseases [1,3].
positive regulation of fever generation and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| IL36RN | Generalized pustular psoriasis with fever | Knockout mouse or human keratinocyte knock-in of mutations |
| IL1B | Sepsis and autoinflammatory fever | Conditional knockout or overexpression in macrophages |
| PTGS2 | Fever and inflammation | Knockout mice or CRISPR-edited cell lines for COX-2 |
| NLRP3 | Cryopyrin-associated periodic syndromes with fever | Knock-in mice carrying gain-of-function mutations |
| IL6 | Cytokine storm and fever | Humanized knock-in mice or overexpression models |
Infectious Diseases and Fever of Unknown Origin
Fever is a hallmark of infection, and positive regulation of fever generation is often exaggerated in severe infections such as sepsis. In a study of critically ill patients, fever patterns were associated with outcomes and required careful management. Fever of unknown origin (FUO) remains a diagnostic challenge, and metagenomic next-generation sequencing has been shown to improve pathogen detection in patients with FUO, linking molecular diagnostics to fever etiology. In Lassa fever, predictors of diagnosis include fever and epidemiological exposure, underscoring the importance of fever as a clinical sign. Chikungunya virus replication organelles have been studied in situ, providing insights into viral pathogenesis that can trigger fever.
Autoinflammatory and Dermatological Diseases
Generalized pustular psoriasis (GPP) is a severe autoinflammatory skin disease characterized by fever and systemic inflammation. The pathophysiology involves dysregulated IL-36 signaling, with mutations in IL36RN and elevated IL-36 cytokines driving neutrophilic inflammation and fever. Targeting IL-36 pathway components has emerged as a therapeutic strategy, highlighting the role of positive regulation of fever generation in disease. Primary atopic disorders can also present with fever, and rapid identification using clinical landmark-guided genomic sequencing enables precise diagnosis and management.
Critical Illness and Systemic Inflammation
In intensive care settings, fever is a common manifestation of systemic inflammation, and its positive regulation can influence patient outcomes. The 36th International Symposium on Intensive Care and Emergency Medicine highlighted the importance of fever in critical illness, including sepsis and trauma. Dysregulated cytokine release, including IL-1, IL-6, and TNF, contributes to fever and organ dysfunction. Understanding the positive regulation of fever generation in this context is essential for developing targeted anti-inflammatory therapies.
From positive regulation of fever generation-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X positively regulate fever generation? | Knockout mouse or CRISPR KO cell line followed by pyrogen challenge |
| Does a point mutation in gene Y alter fever response? | Point-mutation knock-in via CRISPR in mice or human cells |
| Can a tagged version of protein Z track fever signaling? | Tagged knock-in (e.g., GFP) for imaging and proteomics |
| Does overexpression of gene W amplify fever? | Transgenic overexpression or CRISPR activation |
| Which genes are essential for fever in a genome-wide screen? | CRISPR library screening in immune cells |
| How does a candidate gene affect cytokine production? | Knockout and overexpression in primary macrophages |
How to Study the positive regulation of fever generation Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Transcriptome changes | Identify genes upregulated during fever |
| Single-cell RNA-seq | Cell-type-specific expression | Dissect immune cell heterogeneity in fever |
| Multiplex cytokine assay | Cytokine levels | Quantify IL-1β, IL-6, TNF in fever models |
| Metagenomic NGS | Pathogen nucleic acids | Diagnose fever of unknown origin |
| CRISPR knockout screen | Gene essentiality for fever phenotype | Discover positive regulators |
| CRISPR knock-in | Precise mutation effects | Model human fever-associated variants |
| Calcium imaging | Neuronal activity | Map hypothalamic circuits in fever |
| Proteomics | Protein abundance and modifications | Identify signaling changes in fever |
Genomic and Transcriptomic Profiling
RNA sequencing (RNA-seq) of immune cells or tissues from fever models can identify genes differentially expressed during positive regulation of fever generation. Single-cell RNA-seq enables resolution of cell-type-specific responses, such as cytokine production in macrophages or hypothalamic neurons. Metagenomic next-generation sequencing can identify pathogens in fever of unknown origin, linking infection to fever etiology. Clinical genomic sequencing, such as in primary atopic disorders, can reveal monogenic causes of fever.
Proteomic and Cytokine Profiling
Multiplex cytokine assays (e.g., Luminex, ELISA) quantify pyrogenic cytokines such as IL-1β, IL-6, and TNF in serum or supernatant from stimulated cells. Proteomics can identify post-translational modifications and protein interactions in fever signaling pathways. These methods are essential for validating candidate genes identified by CRISPR screens.
Imaging and Neural Circuit Mapping
In vivo imaging techniques, such as PET or fMRI, can visualize hypothalamic activation during fever. Calcium imaging in transgenic mice expressing GCaMP in specific neurons can map neural circuits activated by PGE2. These approaches help dissect the neural components of positive regulation of fever generation.
CRISPR-Based Functional Genomics
CRISPR knockout, knock-in, and overexpression models allow causal testing of genes in fever pathways. Pooled CRISPR screens with cytokine readouts can identify positive regulators of fever generation. Base editing and prime editing enable precise point mutations to model human variants associated with fever syndromes.
How CRISPR Can Be Used to Study GO:0031622 positive regulation of fever generation
Knockout
CRISPR knockout (KO) of candidate genes in immune cells or animal models can determine whether a gene is required for positive regulation of fever generation. For example, KO of IL1B or PTGS2 would be expected to reduce fever in response to pyrogens. Pooled KO screens can identify novel regulators.
Point Mutation
Point mutations identified in patients with fever syndromes (e.g., IL36RN, NLRP3) can be introduced into cell lines or mice using CRISPR base editing or homology-directed repair. These models help establish causality and dissect signaling mechanisms [3,5].
Knock-in
Knock-in of tagged versions of proteins (e.g., GFP-IL-1β) allows real-time tracking of cytokine trafficking and release during fever. Knock-in of humanized alleles can create models for testing therapeutics.
Overexpression
CRISPR activation (CRISPRa) or transgenic overexpression of candidate genes can test whether increased gene dosage amplifies fever. Overexpression of IL36G in keratinocytes, for instance, could model pustular psoriasis with fever [3,5].
How EDITGENE Supports positive regulation of fever generation Research
Researchers studying positive regulation of fever generation-related genes often need to determine whether a candidate gene is causally involved in pyrogenic signaling, and CRISPR-based models provide a robust approach for such functional validation. EDITGENE offers a comprehensive suite of services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of fever generation research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| IL1B Knockout HEK293 Cell Line | EDJ-KQ140 | Human | 3553 | Details Get a Quote |
| PTGS2 Knockout HEK293 Cell Line | EDJ-KQ586 | Human | 5743 | Details Get a Quote |
| PTGER3 Knockout HEK293 Cell Line | EDJ-KQ1599 | Human | 5733 | Details Get a Quote |
| TNF Knockout HEK293 Cell Line | EDJ-KQ17672 | Human | 7124 | Details Get a Quote |
| PTGS2 Knockout HeLa Cell Line | EDJ-KQ18034 | Human | 5743 | Details Get a Quote |
| IL1B Knockout HeLa Cell Line | EDJ-KQ18960 | Human | 3553 | Details Get a Quote |
| PTGS2 Knockout A-549 Cell Line | EDJ-KQ19007 | Human | 5743 | Details Get a Quote |
| PTGER3 Knockout HeLa Cell Line | EDJ-KQ54258 | Human | 5733 | Details Get a Quote |
| TNF Knockout HeLa Cell Line | EDJ-KQ54675 | Human | 7124 | Details Get a Quote |
| IL1B Knockout A-549 Cell Line | EDJ-KQ62103 | Human | 3553 | Details Get a Quote |
| PTGER3 Knockout A-549 Cell Line | EDJ-KQ62749 | Human | 5733 | Details Get a Quote |
| TNF Knockout A-549 Cell Line | EDJ-KQ63158 | Human | 7124 | Details Get a Quote |
| IL1B Knockout HCT 116 Cell Line | EDJ-KQ70590 | Human | 3553 | Details Get a Quote |
| PTGER3 Knockout HCT 116 Cell Line | EDJ-KQ71217 | Human | 5733 | Details Get a Quote |
| PTGS2 Knockout HCT 116 Cell Line | EDJ-KQ71222 | Human | 5743 | Details Get a Quote |
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Frequently Asked Questions About positive regulation of fever generation
What is GO:0031622?
GO:0031622 is the Gene Ontology term for positive regulation of fever generation, defined as any process that activates or increases the frequency, rate, or extent of fever generation.
What genes are involved in positive regulation of fever generation?
Key genes include IL1B, IL6, TNF, PTGS2, PTGER3, IL36G, IL36RN, NLRP3, and MYD88, which encode cytokines, prostaglandin synthases, and signaling molecules [3,6].
How is fever generation positively regulated?
Positive regulation occurs through pyrogenic cytokines (IL-1, IL-6, TNF) that induce COX-2 and PGE2 synthesis in the brain, elevating the hypothalamic set point.
What diseases are associated with positive regulation of fever generation?
Infectious diseases, fever of unknown origin, generalized pustular psoriasis, primary atopic disorders, and critical illness are associated with dysregulated fever regulation [1,2,3,4].
What is the role of IL-36 in fever?
IL-36 signaling drives systemic inflammation and fever in generalized pustular psoriasis, and mutations in IL36RN cause autoinflammatory fever.
How can CRISPR be used to study fever generation?
CRISPR knockout, knock-in, and overexpression models allow causal testing of genes in fever pathways, and pooled screens can identify novel regulators.
What is fever of unknown origin and how is it diagnosed?
Fever of unknown origin is a prolonged fever without identified cause; metagenomic next-generation sequencing can improve pathogen detection.
Which cytokines are endogenous pyrogens?
IL-1, IL-6, and TNF are classic endogenous pyrogens that positively regulate fever generation.
What methods are used to study positive regulation of fever generation?
Methods include RNA-seq, cytokine profiling, CRISPR screens, imaging, and metagenomic sequencing [4,5,6].
Why is positive regulation of fever generation important for drug discovery?
Understanding positive regulators identifies targets for anti-pyretic and anti-inflammatory therapies, such as COX-2 inhibitors and cytokine blockers [3,6].
Conclusion
GO:0031622 (positive regulation of fever generation) is a vital biological process that integrates immune and neural signals to elevate body temperature. The term encompasses the actions of pyrogenic cytokines, prostaglandins, and their downstream effectors, which are critical for host defense but can also drive pathology in infectious and autoinflammatory diseases [1,3,6]. Advances in genomic sequencing and CRISPR-based models are accelerating the discovery of novel regulators and therapeutic targets [2,4,5]. By leveraging EDITGENE's services, researchers can functionally validate candidate genes and translate findings into clinical applications.
References
- 1. Bateman RM et al.. 2016. 36th International Symposium on Intensive Care and Emergency Medicine : Brussels, Belgium. 15-18 March 2016.. Crit Care 20(Suppl 2):94 PMID: 27885969
- 2. Niehues T et al.. 2024. Rapid identification of primary atopic disorders (PAD) by a clinical landmark-guided, upfront use of genomic sequencing.. Allergol Select 8:304-323 PMID: 39381601
- 3. Marrakchi S et al.. 2022. Pathophysiology of Generalized Pustular Psoriasis.. Am J Clin Dermatol 23(Suppl 1):13-19 PMID: 35061228
- 4. Lai LM et al.. 2025. The value of metagenomic next-generation sequencing in the diagnosis of fever of unknown origin.. Sci Rep 15(1):1963 PMID: 39809928
- 5. McGuire DJ et al.. 2025. Regulation of CD45 isoforms during human effector and memory CD8 T cell differentiation: Implications for T cell nomenclature.. Proc Natl Acad Sci U S A 122(32):e2322982122 PMID: 40763029
- 6. Fleer A et al.. 1990. [Cytokines].. Tijdschr Kindergeneeskd 58(6):186-93 PMID: 2089730
- 7. Ochu CL et al.. 2023. Predictors of Lassa fever diagnosis in suspected cases reporting to health facilities in Nigeria.. Sci Rep 13(1):6545 PMID: 37085507
- 8. Girard J et al.. 2024. In situ fate of Chikungunya virus replication organelles.. J Virol 98(7):e0036824 PMID: 38940586
