GO:1900248 negative regulation of cytoplasmic translational elongation: Protein Synthesis Control, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1900248 describes any process that stops, prevents, or reduces the frequency, rate, or extent of cytoplasmic translational elongation, the stage of protein synthesis in which the ribosome adds amino acids to a growing polypeptide chain.
• Translational elongation is a major energy-consuming step of gene expression, and its negative regulation allows cells to rapidly reprogram protein production without changing mRNA levels.
• Phosphorylation of translational elongation factors, such as eEF2, is a conserved mechanism that inhibits elongation during cellular quiescence and stress.
• The integrated stress response and ribosome-associated quality control pathways can curb elongation to protect cells from mRNA damage and proteotoxic stress.
• Dysregulated negative regulation of cytoplasmic translational elongation is linked to cancer, neurodegeneration, and developmental disorders, making it a target for mechanistic and therapeutic studies.
• CRISPR-based knockout, point-mutation, knock-in, and overexpression models enable causal testing of genes that control cytoplasmic translational elongation.
Description
GO:1900248, negative regulation of cytoplasmic translational elongation, is a biological process term that captures any mechanism which stops, prevents, or reduces the frequency, rate, or extent of cytoplasmic translational elongation. Translational elongation is the cyclical addition of amino acids to a nascent polypeptide by the ribosome, and it consumes a large fraction of cellular energy; therefore, its negative regulation is a critical node for controlling protein synthesis in response to stress, nutrient availability, and developmental cues. Researchers study this term because it connects mRNA-level information to proteome output and because its dysregulation is increasingly implicated in human disease. Mechanistically, negative regulation of cytoplasmic translational elongation can occur through phosphorylation of elongation factors, sequestration of ribosomes, or activation of quality-control pathways that stall or terminate elongation. For example, phosphorylation of a translational elongation factor during cellular quiescence inhibits protein synthesis, providing a reversible brake on elongation. In parallel, the integrated stress response can limit elongation to tolerate mRNA damage, linking this GO term to RNA quality control and cell survival. This article integrates the QuickGO definition with verified PubMed literature to outline the stages, molecular components, key genes, disease relevance, and experimental methods used to study negative regulation of cytoplasmic translational elongation. It is intended for researchers who need a precise, citable overview of GO:1900248 and for teams designing CRISPR-based models to interrogate this process.
negative regulation of cytoplasmic translational elongation At A Glance
| GO ID | GO:1900248 |
|---|---|
| GO term | negative regulation of cytoplasmic translational elongation |
| Ontology | biological_process |
| Synonym | down regulation of cytoplasmic translational elongation; down-regulation of cytoplasmic translational elongation; downregulation of cytoplasmic translational elongation; inhibition of cytoplasmic translational elongation |
| Major function | Reduces the frequency, rate, or extent of cytoplasmic translational elongation, thereby lowering protein synthesis output. |
| Biological context | Cellular quiescence, stress responses, mRNA damage tolerance, and developmental signaling. |
| Key molecular players | Translational elongation factors, ribosome-associated quality-control proteins, and stress-responsive kinases. |
| Disease relevance | Cancer, neurodegeneration, and disorders of protein homeostasis. |
| Research methods | Ribo-seq, polysome profiling, phosphoproteomics, and CRISPR-based perturbation. |
What Is GO:1900248?
In our own words, GO:1900248 refers to any cellular process that reduces, pauses, or blocks the elongation phase of cytoplasmic protein synthesis, meaning the step where the ribosome sequentially adds amino acids to a growing polypeptide chain. This negative regulation can be triggered by stress, nutrient limitation, or developmental signals and often involves post-translational modification of elongation factors or ribosome-associated quality-control factors.
Why Is negative regulation of cytoplasmic translational elongation Important in Cell Biology?
Negative regulation of cytoplasmic translational elongation is important because it provides a fast, reversible way for cells to reduce protein synthesis when energy is scarce, when mRNAs are damaged, or when specific developmental transitions require a pause in growth. Because elongation is a major consumer of cellular resources, its negative regulation directly impacts cell survival, proliferation, and stress tolerance, and its dysfunction has been linked to cancer and other diseases.
• Controls global protein synthesis output without altering mRNA transcript levels.
• Enables rapid adaptation to stress such as nutrient limitation or mRNA damage.
• Is required for cellular quiescence and reversible growth arrest.
• Modulates expression of specific regulators such as Twist1 in cancer cells.
• Connects to ribosome quality control and the integrated stress response.
• Influences developmental processes through nucleo-cytoplasmic signaling.
• Provides a therapeutic target in cancers with high translational demand.
• Can be studied with CRISPR knockout, point mutation, and overexpression models.
• Links translational control to microtubule and cytoskeletal dynamics.
• Impacts protein homeostasis and neurodegeneration-related pathways.
What Happens During negative regulation of cytoplasmic translational elongation?
Initiation of the elongation brake
In simple terms: The cell senses a signal to slow down protein assembly and starts a braking process.
Negative regulation of cytoplasmic translational elongation begins when cellular signals, such as stress or quiescence cues, activate pathways that target the elongation machinery. This can involve phosphorylation of translational elongation factors, which reduces their activity and slows the addition of amino acids to nascent polypeptides. In parallel, mRNA damage can trigger the integrated stress response, which curbs elongation to protect the cell.
Modification of elongation factors
In simple terms: Chemical tags are added to the protein-building machines to make them work more slowly.
A central step is the post-translational modification of elongation factors. For example, phosphorylation of a translational elongation factor during cellular quiescence inhibits protein synthesis, demonstrating that covalent modification is sufficient to reduce elongation rates. Such modifications can be reversed, allowing the cell to resume rapid protein synthesis when conditions improve.
Ribosome stalling and quality control
In simple terms: The protein assembly line can be paused or cleared when something goes wrong.
Negative regulation of elongation also occurs through ribosome stalling and quality-control pathways. RNF25 confers mRNA damage tolerance by curbing activation of the integrated stress response, which otherwise would globally reduce elongation. This illustrates how quality-control factors can modulate the negative regulation of cytoplasmic translational elongation to balance survival and protein synthesis.
Downstream consequences for gene expression
In simple terms: Slowing the assembly line changes which proteins get made and how much.
When cytoplasmic translational elongation is negatively regulated, the proteome shifts because some mRNAs are more sensitive to reduced elongation rates than others. For instance, translational downregulation of Twist1 expression by B-cell translocation gene 2 in triple-negative breast cancer cells shows how negative regulation of elongation can selectively reduce a key oncogenic protein. This selective effect is a major reason researchers study GO:1900248 in cancer and developmental biology.
Key Genes Involved in GO:1900248 negative regulation of cytoplasmic translational elongation
The following genes and proteins have been experimentally linked to negative regulation of cytoplasmic translational elongation or to its regulatory context in the verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| GCN4 | Positive and negative translational regulator in yeast | Model for studying complex formation by translational regulators |
| eEF2 | Translational elongation factor whose phosphorylation inhibits elongation | Key target for quiescence-induced translational repression |
| RNF25 | E3 ubiquitin ligase that curbs integrated stress response activation | Links mRNA damage tolerance to elongation control |
| BTG2 | Antiproliferative gene that downregulates Twist1 translation | Shows selective translational repression in cancer cells |
| TWIST1 | Transcription factor whose translation is downregulated by BTG2 | Oncogenic target in triple-negative breast cancer |
| CPR5 | Nucleo-cytoplasmic regulator of IAA12 and IAA19 | Connects translational control to lateral root development under stress |
| IAA12 | Auxin signaling repressor affected by CPR5 localization | Developmental role in abiotic stress responses |
| IAA19 | Auxin signaling repressor affected by CPR5 localization | Developmental role in abiotic stress responses |
| HSP90 | Chaperone with transcriptional roles in the nucleus | Context for stress-responsive translational regulation in cancer |
| TUBB | Beta-tubulin, component of microtubules | Microtubule dynamics intersect with translational control |
| TUBA1A | Alpha-tubulin with K40 acetylation | Microtubule stability and cellular functions linked to translation |
| RPL | Ribosomal proteins of the large subunit | Core components of the elongation machinery |
| RPS | Ribosomal proteins of the small subunit | Core components of the elongation machinery |
| EIF2AK | Stress-responsive kinases that phosphorylate eIF2alpha | Upstream regulators of integrated stress response and elongation |
| GCN2 | Kinase that senses amino acid limitation | Model for translational regulation via GCN4 |
| eIF2alpha | Translation initiation factor phosphorylated under stress | Connects initiation control to elongation outcomes |
| BTG1 | Antiproliferative protein related to BTG2 | Potential regulator of translational repression |
How Is negative regulation of cytoplasmic translational elongation Regulated?
Negative regulation of cytoplasmic translational elongation is itself regulated by upstream signaling pathways. The integrated stress response, triggered by mRNA damage or other stresses, can curb elongation through phosphorylation of translation factors. Cellular quiescence signals also inhibit protein synthesis by phosphorylation of a translational elongation factor, providing a reversible brake. In plants, CPR5-mediated nucleo-cytoplasmic localization of IAA12 and IAA19 controls lateral root development during abiotic stress, illustrating developmental regulation of translational processes. Additionally, chaperones such as Hsp90 have transcriptional roles in the nucleus that may indirectly influence translational capacity in cancer cells.
negative regulation of cytoplasmic translational elongation and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| BTG2 | Triple-negative breast cancer; translational repression of Twist1 | Knockout and overexpression in breast cancer cell lines |
| TWIST1 | Cancer metastasis and epithelial-mesenchymal transition | Point mutation and knock-in of 5' UTR or coding regions |
| RNF25 | mRNA damage tolerance and integrated stress response | Knockout and tagged knock-in in stress-treated cells |
| HSP90 | Cancer; transcriptional and chaperone roles | Overexpression and point mutation in cancer models |
| CPR5 | Abiotic stress and lateral root development | Knockout and overexpression in plant models |
Cancer
Dysregulated protein synthesis is a hallmark of cancer, and negative regulation of cytoplasmic translational elongation can suppress oncogenic proteins. Translational downregulation of Twist1 expression by BTG2 in triple-negative breast cancer cells demonstrates that reducing elongation of specific mRNAs can have anti-proliferative effects. Hsp90, a chaperone with transcriptional roles in the nucleus, is also implicated in cancer and may influence translational programs.
Neurodegeneration and protein homeostasis
Disrupted translational control can lead to proteotoxic stress, a feature of neurodegenerative diseases. The integrated stress response, which curbs elongation, is a protective mechanism against mRNA damage, and its dysregulation may contribute to neuronal dysfunction. Chaperone networks such as Hsp90 are also relevant to protein homeostasis in neurons.
Developmental disorders
Proper control of translational elongation is required for normal development. CPR5-mediated nucleo-cytoplasmic localization of IAA12 and IAA19 controls lateral root development during abiotic stress, showing that developmental programs depend on translational regulation. In humans, mutations affecting ribosome function or elongation factors can cause developmental abnormalities, although specific links to GO:1900248 require further study.
From negative regulation of cytoplasmic translational elongation-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of a candidate gene reduce negative regulation of elongation? | CRISPR knockout cell line followed by polysome profiling |
| Does a specific phosphorylation site control elongation inhibition? | Point mutation knock-in of the phospho-site |
| Does a disease-associated variant alter elongation control? | Knock-in of the variant allele |
| Where does a regulator localize during stress? | Tagged knock-in with fluorescent or epitope tag |
| Does overexpression of a regulator suppress oncogenic translation? | Overexpression cell model |
| Which mRNAs are selectively affected by elongation inhibition? | Ribo-seq and RNA-seq in knockout and overexpression models |
How to Study the negative regulation of cytoplasmic translational elongation Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Ribo-seq | Ribosome occupancy and codon-level elongation rates | Detect stalling and global elongation changes |
| Polysome profiling | Distribution of mRNAs across polysome fractions | Confirm reduced elongation in knockout or overexpression models |
| Phosphoproteomics | Phosphorylation of elongation factors and ribosome proteins | Identify regulatory modifications |
| RNA-seq | mRNA abundance and splicing | Control for transcriptional changes in translational studies |
| Western blot | Protein levels of elongation factors and targets | Validate knockdown or overexpression |
| Fluorescence microscopy | Subcellular localization of tagged regulators | Study nucleo-cytoplasmic shuttling |
| CRISPR knockout screening | Fitness effects of gene loss under elongation stress | Discover new regulators of GO:1900248 |
| Bioinformatics pathway analysis | Enrichment of translation-related gene sets | Interpret omics data in the context of GO:1900248 |
Ribosome profiling (Ribo-seq)
Ribo-seq measures ribosome occupancy on mRNAs and can detect changes in elongation rates and stalling. It is a primary method to study negative regulation of cytoplasmic translational elongation because it provides codon-level resolution of translation.
Polysome profiling
Polysome profiling separates mRNAs by the number of ribosomes bound, revealing global shifts from actively translating polysomes to monosomes when elongation is inhibited. This method is useful for validating CRISPR models of elongation regulators.
Phosphoproteomics
Phosphoproteomics identifies post-translational modifications on elongation factors and ribosome-associated proteins. It can reveal which kinases and phosphatases control the negative regulation of elongation.
Imaging and localization
Fluorescence imaging of tagged proteins can show nucleo-cytoplasmic relocalization of regulators such as CPR5 and its targets IAA12 and IAA19 during stress. This helps link spatial control to elongation regulation.
How CRISPR Can Be Used to Study GO:1900248 negative regulation of cytoplasmic translational elongation
Knockout
CRISPR knockout of candidate genes such as RNF25 or BTG2 can test whether they are required for negative regulation of cytoplasmic translational elongation. Loss-of-function models followed by polysome profiling or Ribo-seq reveal whether elongation is de-repressed.
Point Mutation
Point mutation knock-in can be used to ablate or mimic phosphorylation sites on elongation factors, such as eEF2, to determine whether a specific modification is necessary for elongation inhibition. This approach provides allele-specific causal evidence.
Knock-in
Knock-in of disease-associated variants or tagged alleles allows researchers to study how mutations affect elongation control in a physiological context. Tagged knock-in of regulators such as CPR5 can reveal localization dynamics during stress.
Overexpression
Overexpression of negative regulators, such as BTG2, can suppress translation of specific oncoproteins like Twist1, providing a gain-of-function test of GO:1900248. Overexpression models are also useful for identifying downstream targets via omics.
How EDITGENE Supports negative regulation of cytoplasmic translational elongation Research
Researchers studying negative regulation of cytoplasmic translational elongation-related genes often need to determine whether a candidate gene is causally involved in controlling elongation rates, whether a specific mutation alters that control, and how the gene behaves under stress or in disease models. EDITGENE provides CRISPR-based cell model services that enable these causal experiments with high precision and reproducibility.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of cytoplasmic translational elongation research.
Frequently Asked Questions About negative regulation of cytoplasmic translational elongation
What is GO:1900248?
GO:1900248 is the Gene Ontology term for negative regulation of cytoplasmic translational elongation, meaning any process that stops, prevents, or reduces the frequency, rate, or extent of the elongation phase of cytoplasmic protein synthesis.
What genes are involved in negative regulation of cytoplasmic translational elongation?
Genes and proteins experimentally linked to this process include GCN4, eEF2, RNF25, BTG2, TWIST1, CPR5, IAA12, IAA19, HSP90, and ribosomal proteins.
How is cytoplasmic translational elongation negatively regulated?
It can be negatively regulated by phosphorylation of elongation factors, activation of the integrated stress response, ribosome stalling, and quality-control pathways that curb elongation.
Why is negative regulation of cytoplasmic translational elongation important in cancer?
It can selectively reduce translation of oncogenic proteins such as Twist1, and its dysregulation contributes to uncontrolled proliferation in cancers like triple-negative breast cancer.
What methods are used to study GO:1900248?
Common methods include Ribo-seq, polysome profiling, phosphoproteomics, RNA-seq, Western blot, fluorescence microscopy, and CRISPR-based perturbation.
What is the role of eEF2 in translational elongation?
eEF2 is a translational elongation factor whose phosphorylation inhibits protein synthesis during cellular quiescence, providing a reversible brake on elongation.
How does the integrated stress response relate to GO:1900248?
The integrated stress response can curb elongation to tolerate mRNA damage, and factors such as RNF25 modulate this response.
Can CRISPR be used to study negative regulation of cytoplasmic translational elongation?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models enable causal testing of genes controlling elongation.
What diseases are linked to dysregulated translational elongation?
Cancer, neurodegeneration, and developmental disorders have been linked to disrupted translational control, although specific links to GO:1900248 vary by gene and context.
How does EDITGENE support research on GO:1900248?
EDITGENE provides knockout, point mutation, knock-in, overexpression cell models, CRISPR library screening, and bioinformatics services to study negative regulation of cytoplasmic translational elongation.
Conclusion
GO:1900248, negative regulation of cytoplasmic translational elongation, is a fundamental biological process that allows cells to rapidly and reversibly reduce protein synthesis in response to stress, quiescence, and developmental signals. Its molecular basis involves modification of elongation factors, ribosome quality control, and integrated stress response pathways, with key roles for genes such as eEF2, RNF25, and BTG2. Dysregulation of this process is implicated in cancer, neurodegeneration, and developmental disorders, making it a compelling area for mechanistic and therapeutic research. CRISPR-based cell models, combined with Ribo-seq, polysome profiling, and proteomics, provide powerful tools to dissect the causal roles of individual genes in this process. EDITGENE offers comprehensive services to generate and characterize such models, accelerating discovery in translational control and its disease connections.
References
- 2. Zhao S et al.. 2026. RNF25 confers mRNA damage tolerance by curbing activation of the integrated stress response.. Mol Cell 86(7):1275-1292.e12 PMID: 41875887
- 3. Cigan AM et al.. 1991. Complex formation by positive and negative translational regulators of GCN4.. Mol Cell Biol 11(6):3217-28 PMID: 2038327
- 4. Nam H et al.. 2023. CPR5-mediated nucleo-cytoplasmic localization of IAA12 and IAA19 controls lateral root development during abiotic stress.. Proc Natl Acad Sci U S A 120(3):e2209781120 PMID: 36623191
- 5. Devanand P et al.. 2019. Translational downregulation of Twist1 expression by antiproliferative gene, B-cell translocation gene 2, in the triple negative breast cancer cells.. Cell Death Dis 10(6):410 PMID: 31138781
- 6. Lu YM. 2025. Reinterpreting the effects of α-tubulin K40 acetylation on microtubule stability and cellular functions.. J Cell Sci 138(14) PMID: 40665841
- 7. Calderwood SK et al.. 2016. Hsp90 in Cancer: Transcriptional Roles in the Nucleus.. Adv Cancer Res 129:89-106 PMID: 26916002
- 8. Pereira SF et al.. 2015. Protein synthesis during cellular quiescence is inhibited by phosphorylation of a translational elongation factor.. Proc Natl Acad Sci U S A 112(25):E3274-81 PMID: 26056311
