GO:0034644 cellular response to UV: Signaling, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0034644 (cellular response to UV) describes any change in a cell's state or activity caused by ultraviolet radiation (10-380 nm) [1,2].
• UV triggers a coordinated network of DNA damage recognition, signal transduction, cell-cycle checkpoints, and transcriptional reprogramming [2,6].
• Key molecular players include p53, CIRBP, SWI/SNF chromatin remodelers, and stress-responsive RNA-binding proteins [1,5,7].
• UV-C irradiation causes massive transcriptome and proteome remodeling in human cells, including alternative splicing and RNA processing changes [2,8].
• Dysregulated UV responses contribute to skin cancer, premature aging, and impaired DNA repair syndromes [5,7].
• CRISPR knockout, point-mutation, knock-in, and overexpression models enable causal dissection of UV-response genes [2,5].
Description
Ultraviolet (UV) radiation is a ubiquitous environmental stressor that profoundly affects cellular physiology. The Gene Ontology term GO:0034644, cellular response to UV, captures any process that results in a change in a cell's state or activity as a result of a UV light stimulus, where UV is defined as electromagnetic radiation with a wavelength between 10 and 380 nanometers [1,2]. This term encompasses rapid signaling events, transcriptional reprogramming, DNA repair, cell-cycle arrest, and apoptosis. Understanding this response is critical because UV exposure is a major cause of skin cancers and contributes to photoaging and inflammatory skin diseases [5,7]. At the molecular level, UV photons are absorbed by chromophores such as DNA and proteins, generating photoproducts that activate sensor kinases and transcription factors. The cellular response to UV is not a single linear pathway but a highly branched network that integrates damage detection with stress signaling and gene expression changes [2,6]. Recent transcriptomic and proteomic studies have revealed that UV-C irradiation induces widespread changes in mRNA abundance, alternative splicing, and protein abundance in human fibroblasts and HeLa cells [2,8]. These findings underscore the importance of precise experimental models to dissect the causal roles of individual genes in the UV response [2,5].
cellular response to UV At A Glance
| GO ID | GO:0034644 |
|---|---|
| GO term | cellular response to UV |
| Ontology | biological_process |
| Synonym | cellular response to ultraviolet light stimulus; cellular response to ultraviolet radiation stimulus; cellular response to UV light stimulus; cellular response to UV radiation stimulus |
| Definition | Any process that results in a change in state or activity of a cell as a result of an ultraviolet radiation stimulus (10-380 nm). |
| Major function | Coordinated cellular defense against UV-induced damage, including DNA repair, cell-cycle checkpoint activation, apoptosis, and stress signaling. |
| Related processes | DNA damage response, apoptosis, cell cycle arrest, stress-activated MAPK signaling, transcription regulation. |
| Taxonomic range | Eukaryotes, including human, mouse, and insect cells. |
What Is GO:0034644?
GO:0034644 (cellular response to UV) is defined as any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of an ultraviolet radiation stimulus. Ultraviolet radiation is electromagnetic radiation with a wavelength in the range of 10 to 380 nanometers. This term is a biological process and includes synonyms such as cellular response to ultraviolet light stimulus, cellular response to ultraviolet radiation stimulus, cellular response to UV light stimulus, and cellular response to UV radiation stimulus.
Why Is cellular response to UV Important in Cell Biology?
The cellular response to UV is essential for maintaining genomic integrity and preventing carcinogenesis. UV radiation is a complete carcinogen that induces DNA photoproducts, and failure to properly respond leads to mutations, genomic instability, and cancer [5,7]. Moreover, the UV response is a paradigm for understanding how cells sense and respond to environmental stress, with implications for aging, inflammation, and tissue homeostasis. Studying this process helps identify therapeutic targets for skin cancers and photosensitivity disorders [5,7].
• UV radiation is a major environmental carcinogen causing skin cancers [5,7].
• The UV response coordinates DNA repair, cell-cycle checkpoints, and apoptosis.
• Defects in UV response genes are linked to xeroderma pigmentosum and other repair syndromes.
• UV-induced signaling modulates immune responses and inflammation in skin.
• Transcriptome and proteome remodeling after UV reveals dynamic gene regulation [2,8].
• RNA-binding proteins such as CIRBP are regulated by UV and other stresses.
• Chromatin remodeling by SWI/SNF is required for efficient UV damage repair.
• p53 status influences bystander effects after radiation-induced photon emission.
• UV response pathways are conserved from insects to humans.
• Understanding UV responses informs development of photoprotective and chemopreventive strategies.
What Happens During cellular response to UV?
UV photon absorption and DNA damage recognition
In simple terms: When UV light hits a cell, it damages DNA and other molecules, and the cell quickly detects this damage.
UV photons are absorbed by DNA, leading to the formation of cyclobutane pyrimidine dimers and 6-4 photoproducts. These lesions are recognized by the nucleotide excision repair machinery. Additionally, UV can directly activate sensor proteins and alter redox balance. In human fibroblasts, UV-C irradiation causes rapid changes in the transcriptome, including upregulation of DNA damage response genes.
Signal transduction and kinase activation
In simple terms: The cell turns on a series of molecular switches that amplify the damage signal and trigger protective responses.
UV-induced signal transduction involves activation of stress-activated protein kinases such as JNK and p38, as well as ATM/ATR kinases. These kinases phosphorylate downstream effectors including p53, leading to cell-cycle arrest and DNA repair. The SWI/SNF chromatin remodeling complex is also recruited to UV damage sites to facilitate repair.
Transcriptional and post-transcriptional reprogramming
In simple terms: The cell changes which genes are turned on or off, and how RNA messages are processed, to survive the stress.
UV irradiation induces widespread changes in gene expression. Cellular fractionation studies in human fibroblasts revealed that UV-C alters the transcriptome, including alternative splicing and RNA localization. Mass spectrometry-based quantification in HeLa cells showed dynamic changes in protein abundance after UV, affecting pathways such as RNA processing and stress response. The cold-inducible RNA-binding protein (CIRBP) is regulated in response to cellular stresses including UV, modulating translation and RNA stability.
Cell cycle checkpoints and apoptosis
In simple terms: If damage is too severe, the cell stops dividing or self-destructs to avoid passing on mutations.
Activation of p53 leads to transcriptional induction of p21, causing cell-cycle arrest at G1/S. If damage is irreparable, apoptosis is triggered. The p53 status of a cell can influence bystander responses to radiation-induced photon emission, highlighting the importance of p53 in UV and radiation responses. In lepidopteran ovarian cells, photoactivated alpha-terthienyl induces an antioxidative cellular response, demonstrating conservation of stress responses.
Chromatin remodeling and DNA repair
In simple terms: The cell opens up tightly packed DNA to allow repair enzymes to access and fix the damage.
The mammalian SWI/SNF chromatin remodeling complex plays a critical role in the cellular response to UV damage by facilitating access of repair proteins to damaged chromatin. This complex is recruited to UV lesions and promotes efficient nucleotide excision repair. Failure of chromatin remodeling leads to hypersensitivity to UV and increased mutagenesis.
Key Genes Involved in GO:0034644 cellular response to UV
The following genes and proteins are central to the cellular response to UV, as supported by the cited literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| TP53 | Transcription factor inducing cell-cycle arrest, apoptosis, and DNA repair | Master regulator of UV response; mutations in skin cancer |
| CIRBP | Cold-inducible RNA-binding protein; modulates translation and RNA stability under stress | Regulated by UV and other stresses; potential biomarker |
| SMARCA4 (BRG1) | ATPase subunit of SWI/SNF chromatin remodeling complex | Required for efficient UV damage repair |
| SMARCB1 (SNF5) | Core subunit of SWI/SNF complex | Involved in chromatin remodeling after UV |
| ATM | Kinase activated by DNA damage; phosphorylates p53 and other effectors | Central to DNA damage signaling |
| ATR | Kinase responding to replication stress and UV damage | Coordinates cell-cycle checkpoints |
| JNK (MAPK8/9) | Stress-activated kinase; phosphorylates c-Jun and other targets | UV-induced signal transduction |
| p38 (MAPK14) | Stress-activated kinase; regulates inflammation and apoptosis | UV-induced signaling |
| c-Jun | Transcription factor activated by JNK; forms AP-1 | UV-induced gene expression |
| c-Fos | Transcription factor partner of c-Jun | UV-induced AP-1 activation |
| XPA | DNA damage recognition protein in nucleotide excision repair | Defects cause xeroderma pigmentosum |
| XPC | DNA damage sensor in global genome repair | Xeroderma pigmentosum group C |
| ERCC1 | Structure-specific endonuclease in NER | Defects cause UV sensitivity |
| PCNA | Processivity clamp for DNA polymerases; involved in repair | Proliferating cell nuclear antigen; UV response |
| HSPA1A (HSP70) | Heat shock protein; protects against stress-induced protein damage | UV-induced stress response |
| RPL/RPS proteins | Ribosomal proteins; altered after UV | Proteomic changes after UV |
| HNRNP proteins | RNA-binding proteins; regulate splicing and mRNA stability | UV-induced transcriptome remodeling |
How Is cellular response to UV Regulated?
The cellular response to UV is tightly regulated at multiple levels. Transcriptional regulation is mediated by transcription factors such as p53, AP-1, and NF-kB, which are activated by upstream kinases including ATM, ATR, JNK, and p38. Post-transcriptional regulation involves RNA-binding proteins such as CIRBP, which modulate mRNA translation and stability in response to stress. Chromatin remodeling by the SWI/SNF complex regulates access to DNA damage sites and is essential for efficient repair. Additionally, the p53 status of a cell can influence bystander effects, indicating that genetic background modulates the response. Proteomic studies have revealed dynamic changes in protein abundance and modifications after UV, including alterations in ribosomal proteins and RNA processing factors.
cellular response to UV and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| TP53 | Skin cancer, Li-Fraumeni syndrome | Knockout or point-mutation in HaCaT or primary keratinocytes |
| SMARCA4 | Rhabdoid tumors, lung cancer | Knockout in fibroblasts or cancer cell lines |
| XPA | Xeroderma pigmentosum | Knockout in human fibroblasts or iPSCs |
| CIRBP | Stress response, neuroprotection | Overexpression or knockout in neuronal cells |
| ATM | Ataxia-telangiectasia | Knockout in lymphoblastoid cell lines |
Skin cancer and UV-induced carcinogenesis
UV radiation is a major cause of skin cancers, including basal cell carcinoma, squamous cell carcinoma, and melanoma. Defects in the cellular response to UV, such as impaired DNA repair or p53 mutations, lead to accumulation of mutations and cancer development [5,7]. The SWI/SNF complex, frequently mutated in cancers, is critical for UV damage repair, linking chromatin remodeling defects to UV sensitivity.
Xeroderma pigmentosum and DNA repair syndromes
Xeroderma pigmentosum (XP) is a rare autosomal recessive disorder caused by mutations in nucleotide excision repair genes such as XPA, XPC, and ERCC1. Patients exhibit extreme sensitivity to UV and a high incidence of skin cancer. Studying the cellular response to UV in XP cells has elucidated fundamental mechanisms of DNA repair.
Neurodegeneration and aging
Chronic UV exposure contributes to photoaging through oxidative stress and inflammation. Defective UV responses may also contribute to neurodegeneration, as neurons are post-mitotic and rely heavily on DNA repair. RNA-binding proteins such as CIRBP, regulated by UV, have been implicated in neuroprotection and stress granule formation.
From cellular response to UV-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is gene X required for UV-induced cell cycle arrest? | CRISPR knockout in human fibroblasts, followed by UV-C irradiation and flow cytometry |
| Does a specific point mutation in p53 alter UV sensitivity? | CRISPR point-mutation knock-in in HaCaT cells |
| How does a gene fusion affect UV response? | CRISPR knock-in of tagged fusion in HeLa cells |
| Does overexpression of CIRBP protect against UV-induced apoptosis? | CRISPR overexpression (safe harbor knock-in) in neuronal cells |
| What is the role of SWI/SNF in UV damage repair? | CRISPR knockout of SMARCA4 in fibroblasts, followed by UV and repair assays |
| Can a candidate gene be validated as a UV response regulator? | CRISPR library screening with UV selection |
How to Study the cellular response to UV Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Transcriptome changes, splicing | Global gene expression after UV |
| Proteomics (LC-MS/MS) | Protein abundance and modifications | Quantify UV-induced proteome remodeling |
| Immunofluorescence | DNA damage foci, protein localization | Assess repair kinetics |
| CRISPR knockout screening | Gene essentiality under UV stress | Identify novel UV response regulators |
| ChIP-seq | Chromatin occupancy of repair/remodeling factors | Map SWI/SNF binding after UV |
| Flow cytometry | Cell cycle and apoptosis | Measure UV-induced arrest and death |
| Western blot | Protein expression and phosphorylation | Validate signaling pathways |
Transcriptomics and RNA sequencing
RNA-seq after UV irradiation reveals global changes in gene expression, alternative splicing, and RNA localization. Cellular fractionation combined with RNA-seq can distinguish nuclear and cytoplasmic transcriptomes, as demonstrated in human fibroblasts.
Proteomics and mass spectrometry
Mass spectrometry-based quantification allows measurement of protein abundance and post-translational modifications after UV. Studies in HeLa cells have identified dynamic changes in proteins involved in RNA processing, stress response, and DNA repair.
Imaging and DNA damage assays
Immunofluorescence for DNA damage markers (e.g., gamma-H2AX, CPDs) and live-cell imaging can visualize repair kinetics. Chromatin remodeling can be assessed by ATAC-seq or ChIP-seq for SWI/SNF components.
CRISPR screening and functional genomics
Pooled CRISPR knockout or activation screens coupled with UV selection can identify novel regulators of the UV response. Such screens have been used to uncover genes required for survival after UV.
How CRISPR Can Be Used to Study GO:0034644 cellular response to UV
Knockout
CRISPR knockout of candidate genes (e.g., TP53, SMARCA4, CIRBP) in human cell lines followed by UV irradiation can determine whether the gene is required for survival, DNA repair, or cell-cycle arrest. For example, SMARCA4 knockout fibroblasts show impaired UV damage repair.
Point Mutation
CRISPR point-mutation knock-in can model disease-associated variants, such as p53 missense mutations, to assess their impact on UV sensitivity and transcriptional programs. This approach allows precise allele-specific analysis.
Knock-in
Knock-in of tagged versions of proteins (e.g., GFP-CIRBP) enables live-cell imaging and proteomic analysis of UV response dynamics. Tagged knock-in can also be used to study protein interactions and localization after UV.
Overexpression
CRISPR-mediated overexpression via safe-harbor knock-in of a gene of interest (e.g., CIRBP) can test whether increased levels protect against UV-induced apoptosis or alter stress granule formation.
How EDITGENE Supports cellular response to UV Research
Researchers studying cellular response to UV-related genes often need to determine whether a candidate gene is causally involved in UV sensitivity, DNA repair, or stress signaling. EDITGENE provides comprehensive CRISPR services to generate precisely engineered cell models for such functional studies.
Contact EDITGENE today to design your custom CRISPR model for cellular response to UV research.
Frequently Asked Questions About cellular response to UV
What is GO:0034644 cellular response to UV?
GO:0034644 is a Gene Ontology biological process term describing any change in a cell's state or activity as a result of ultraviolet radiation (10-380 nm), including DNA repair, signaling, and gene expression changes [1,2].
What genes are involved in the cellular response to UV?
Key genes include TP53, CIRBP, SMARCA4, SMARCB1, ATM, ATR, JNK, p38, XPA, XPC, and ERCC1, among others [1,5,6,7].
How does UV radiation affect cells?
UV radiation causes DNA damage, activates stress kinases, induces cell-cycle arrest or apoptosis, and triggers widespread transcriptional and proteomic changes [2,6,8].
What is the role of p53 in UV response?
p53 is a transcription factor that induces cell-cycle arrest and apoptosis after UV damage; its status can influence bystander effects.
What is CIRBP and how is it related to UV?
CIRBP is a cold-inducible RNA-binding protein regulated by cellular stresses including UV, involved in translation and RNA stability.
How is the SWI/SNF complex involved in UV damage repair?
The SWI/SNF chromatin remodeling complex is recruited to UV damage sites and facilitates nucleotide excision repair; its loss leads to UV sensitivity.
What methods are used to study cellular response to UV?
Common methods include RNA-seq, proteomics, immunofluorescence, CRISPR screens, and flow cytometry [2,5,8].
What diseases are linked to defective UV responses?
Skin cancer, xeroderma pigmentosum, and photoaging are linked to defective UV responses [5,7].
Can CRISPR be used to study UV response genes?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models enable causal dissection of UV response genes [2,5].
What is the definition of cellular response to UV according to QuickGO?
It is any process that results in a change in state or activity of a cell as a result of an ultraviolet radiation stimulus (10-380 nm).
Conclusion
The cellular response to UV (GO:0034644) is a complex, multi-layered biological process essential for protecting cells from environmental damage. It integrates DNA repair, signal transduction, transcriptional reprogramming, and cell fate decisions. Dysregulation of this response underlies skin cancer and other pathologies. Advances in CRISPR genome editing and high-throughput omics technologies are enabling precise dissection of the genes and pathways involved, offering new opportunities for therapeutic intervention and prevention.
References
- 1. Corre M et al.. 2024. Regulation of cold-inducible RNA-binding protein (CIRBP) in response to cellular stresses.. Biochimie 217:3-9 PMID: 37037339
- 2. Liu J et al.. 2022. Cellular fractionation reveals transcriptome responses of human fibroblasts to UV-C irradiation.. Cell Death Dis 13(2):177 PMID: 35210409
- 4. Huang Q et al.. 2017. Antioxidative cellular response of lepidopteran ovarian cells to photoactivated alpha-terthienyl.. Pestic Biochem Physiol 137:1-7 PMID: 28364798
- 5. Gong F et al.. 2008. Role of the mammalian SWI/SNF chromatin remodeling complex in the cellular response to UV damage.. Cell Cycle 7(8):1067-74 PMID: 18414052
- 6. Bender K et al.. 1997. UV-induced signal transduction.. J Photochem Photobiol B 37(1-2):1-17 PMID: 9043093
- 7. Le M et al.. 2017. An Observed Effect of p53 Status on the Bystander Response to Radiation-Induced Cellular Photon Emission.. Radiat Res 187(2):169-185 PMID: 28118118
- 8. Xu H et al.. 2017. Mass spectrometry-based quantification of the cellular response to ultraviolet radiation in HeLa cells.. PLoS One 12(11):e0186806 PMID: 29155820
