GO:1990253 cellular response to leucine starvation: Amino Acid Sensing Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1990253 describes how a cell changes its state or activity when leucine becomes scarce, a condition that triggers broad transcriptional, translational and metabolic reprogramming.
• The mTORC1 pathway is the central sensor of leucine availability, and leucine deprivation causes rapid mTORC1 inactivation through Rag GTPase-dependent mechanisms.
• Loss of mTORC1 signaling during leucine starvation activates TFEB, which drives lysosomal and autophagic gene expression to restore amino acid supply.
• GSK3alpha forms supramolecular assemblies under amino acid starvation, providing a non-mTORC1 layer of the leucine-starvation response.
• Sestrin proteins act as conserved low-leucine sensors that mediate adaptation to dietary leucine restriction in Drosophila.
• Leucine starvation responses are studied with CRISPR knockout, knock-in and overexpression models combined with Ribo-seq, RNA-seq, proteomics and imaging.
Description
Cellular response to leucine starvation (GO:1990253) is the biological process by which a cell alters its state or activity in response to deprivation of the essential amino acid leucine. Leucine is not only a building block for protein synthesis but also a potent signal that controls growth, autophagy and metabolism, so its withdrawal forces cells to reorganize gene expression, translation and nutrient recycling. The term captures the full set of cellular changes triggered by leucine scarcity, including signaling, transcriptional and metabolic adaptations.
cellular response to leucine starvation At A Glance
| GO ID | GO:1990253 |
|---|---|
| GO term | cellular response to leucine starvation |
| Ontology | biological_process |
| Synonym | none |
| Major function | Cellular adaptation to leucine deprivation through signaling, transcriptional and metabolic reprogramming |
| Key sensors | mTORC1, Rag GTPases, GSK3alpha, Sestrins |
| Key effectors | TFEB, autophagy and lysosomal genes |
| Model organisms | Drosophila, Schizosaccharomyces pombe, mammalian cells |
What Is GO:1990253?
GO:1990253 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 deprivation of leucine. It is a biological_process term that encompasses the sensing, signaling and effector responses that allow a cell to cope with low leucine availability.
Why Is cellular response to leucine starvation Important in Cell Biology?
Leucine starvation is a fundamental stress that reveals how cells couple nutrient availability to growth, autophagy and survival, and its dysregulation is linked to cancer, neurodegeneration and metabolic disease. Understanding GO:1990253 helps researchers interpret nutrient-sensing pathways, design dietary and pharmacological interventions, and identify therapeutic targets in diseases where leucine sensing is altered.
• Leucine is an essential amino acid and a key activator of mTORC1, so its deprivation rapidly suppresses global protein synthesis.
• Leucine starvation induces autophagy and lysosomal biogenesis through TFEB, providing an alternative source of amino acids.
• The response is conserved from yeast to humans, making it a tractable model for nutrient-sensing research.
• GSK3alpha supramolecular assembly under amino acid starvation reveals mTORC1-independent signaling nodes.
• Sestrin-mediated low-leucine detection in Drosophila links dietary leucine restriction to organismal adaptation.
• Dysregulated leucine sensing contributes to cancer cell survival under nutrient-poor conditions.
• Neurodegenerative diseases often show impaired autophagy, which is downstream of leucine-starvation signaling.
• Leucine-starvation responses are relevant to metabolic disorders and aging research.
• CRISPR models of leucine-sensing genes enable causal testing of candidate pathways.
• The process is a paradigm for studying how cells integrate nutrient signals with gene expression.
What Happens During cellular response to leucine starvation?
Leucine sensing and mTORC1 inactivation
In simple terms: When leucine runs low, the cell's main growth switch, mTORC1, turns off.
Leucine deprivation is sensed by the Rag GTPase dimer code, which controls mTORC1 recruitment to the lysosomal surface and its subsequent inactivation. This inactivation reduces anabolic processes and initiates catabolic programs.
TFEB activation and lysosomal biogenesis
In simple terms: The cell turns on a cleanup and recycling program by moving TFEB into the nucleus.
mTORC1 inactivation during leucine starvation allows TFEB to translocate to the nucleus, where it activates genes for lysosomal function and autophagy. TFEB also controls lipid metabolism through a starvation-induced autoregulatory loop.
Autophagosome biogenesis and ribophagy
In simple terms: The cell builds recycling vesicles and digests its own ribosomes to survive.
TFEB coordinates autophagosome biogenesis and ribophagy during starvation via SQSTM1, enabling degradation of ribosomes and other cargo to replenish amino acids.
GSK3alpha supramolecular assembly
In simple terms: A separate stress sensor, GSK3alpha, clumps together when amino acids are scarce.
Amino acid starvation, including leucine deprivation, triggers supramolecular assembly of GSK3alpha, which represents a cellular response to amino acid starvation distinct from mTORC1 signaling.
Sestrin-mediated adaptation in metazoans
In simple terms: Sestrin proteins help animals detect and adapt to low-leucine diets.
In Drosophila, Sestrin mediates detection of and adaptation to low-leucine diets, linking leucine sensing to organismal physiology.
Conserved response in fission yeast
In simple terms: Even simple yeast cells respond to leucine, showing the pathway is ancient.
Schizosaccharomyces pombe mounts a specific response to leucine, demonstrating conservation of leucine-starvation responses across eukaryotes.
Key Genes Involved in GO:1990253 cellular response to leucine starvation
The following genes and proteins are central to the cellular response to leucine starvation, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| MTOR | Core kinase of mTORC1 that senses leucine and controls growth | Target for nutrient-sensing studies and cancer therapy |
| TFEB | Transcription factor activated by leucine starvation to drive lysosomal and autophagic genes | Key effector of starvation-induced autophagy and lysosome biogenesis |
| GSK3A | Forms supramolecular assemblies under amino acid starvation | mTORC1-independent starvation sensor |
| SESN1/2 | Sestrin proteins mediate low-leucine detection and adaptation | Conserved leucine sensor in Drosophila and mammals |
| SQSTM1 | Scaffold protein required for TFEB-coordinated autophagosome biogenesis and ribophagy | Links autophagy cargo recognition to starvation response |
| RRAGA | Rag GTPase that recruits mTORC1 to lysosomes in response to leucine | Component of the Rag GTPase dimer code |
| RRAGB | Rag GTPase partner in leucine sensing | Determines mTORC1 activation state |
| RRAGC | Rag GTPase that contributes to amino acid-dependent mTORC1 regulation | Target for disrupting leucine sensing |
| RRAGD | Rag GTPase involved in the dimer code for amino acid signaling | Modulates mTORC1 response to leucine |
| LAMTOR1 | Component of the Ragulator complex that anchors Rag GTPases | Required for lysosomal mTORC1 activation |
| ATP6V1A | V-ATPase subunit implicated in amino acid sensing | Potential modulator of leucine response |
| SLC38A9 | Lysosomal arginine/leucine sensor that regulates mTORC1 | Transporter-linked leucine sensing |
| CAST1 | Component of the lysosomal amino acid sensing machinery | Supports Rag GTPase-dependent signaling |
| TSC2 | Tumor suppressor that integrates nutrient signals to mTORC1 | Links leucine starvation to growth control |
| RHEB | Activator of mTORC1 downstream of leucine sensing | Key node in leucine-dependent mTORC1 activation |
| EIF4EBP1 | Translation repressor regulated by mTORC1 under leucine starvation | Readout of mTORC1 activity |
| RPS6KB1 | mTORC1 substrate controlling translation during leucine availability | Marker of leucine-starvation response |
How Is cellular response to leucine starvation Regulated?
The cellular response to leucine starvation is primarily regulated by mTORC1, which is inactivated through the Rag GTPase dimer code when leucine is scarce. This inactivation relieves TFEB inhibition, allowing TFEB nuclear translocation and activation of lysosomal and autophagic programs. TFEB further autoregulates its own expression and lipid metabolism through a starvation-induced loop. GSK3alpha supramolecular assembly provides an additional regulatory layer independent of mTORC1. Sestrin proteins modulate the response in metazoans, linking leucine availability to organismal adaptation.
cellular response to leucine starvation and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| TFEB | Neurodegeneration, lysosomal storage disorders | TFEB knockout and knock-in cell lines with leucine starvation |
| MTOR | Cancer, metabolic disease | mTOR point-mutation and knockout models |
| GSK3A | Cancer, neurodegeneration | GSK3A knockout and tagged knock-in for assembly studies |
| SESN1/2 | Metabolic stress, aging | Sestrin overexpression and knockout in Drosophila and mammalian cells |
| SQSTM1 | Neurodegeneration, autophagy disorders | SQSTM1 knockout for ribophagy assays |
Cancer and nutrient stress
Tumors often face leucine-poor conditions, and mTORC1 inactivation through the Rag GTPase code determines whether cancer cells survive or die under nutrient stress. TFEB-driven autophagy can support tumor cell survival during starvation.
Neurodegeneration and autophagy
Impaired TFEB-mediated autophagy is linked to neurodegenerative diseases, and leucine-starvation signaling that activates TFEB may protect neurons by enhancing clearance of toxic aggregates.
Metabolic and lysosomal storage disorders
TFEB controls lipid metabolism and lysosomal function, so dysregulation of the leucine-starvation response may contribute to metabolic and lysosomal storage diseases.
From cellular response to leucine starvation-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is TFEB required for leucine-starvation-induced autophagy? | TFEB knockout cell line |
| Does GSK3alpha assembly depend on leucine deprivation? | GSK3A tagged knock-in with imaging |
| How do Rag GTPase mutations affect mTORC1 inactivation? | Rag GTPase point-mutation knock-in |
| Does Sestrin overexpression protect against low leucine? | Sestrin overexpression in Drosophila |
| What is the role of SQSTM1 in ribophagy? | SQSTM1 knockout cells |
| Is the leucine response conserved in yeast? | Schizosaccharomyces pombe deletion mutants |
How to Study the cellular response to leucine starvation Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Gene expression changes | TFEB target gene induction |
| Ribo-seq | Translation efficiency | Global translation repression |
| Phosphoproteomics | mTORC1 substrate phosphorylation | Leucine-dependent signaling |
| Imaging | TFEB localization, GSK3alpha assembly | Starvation response dynamics |
| Autophagy flux assays | Autophagosome formation and degradation | TFEB and SQSTM1 function |
| Yeast genetics | Growth and stress response | Conserved leucine response |
| Drosophila feeding assays | Organismal adaptation to low leucine | Sestrin function |
Transcriptomic profiling
RNA-seq after leucine starvation reveals TFEB-dependent and independent gene expression changes, including lysosomal and autophagic genes.
Translational profiling
Ribo-seq measures global translation changes and identifies mRNAs whose translation is selectively affected by leucine deprivation.
Proteomics and phosphoproteomics
Mass spectrometry detects changes in mTORC1 substrates such as EIF4EBP1 and RPS6KB1, and identifies GSK3alpha assembly partners.
Imaging of TFEB and GSK3alpha
Fluorescence microscopy monitors TFEB nuclear translocation and GSK3alpha supramolecular assembly during leucine starvation.
How CRISPR Can Be Used to Study GO:1990253 cellular response to leucine starvation
Knockout
CRISPR knockout of TFEB, MTOR, GSK3A or SQSTM1 enables loss-of-function studies of leucine-starvation responses, revealing which genes are essential for survival under leucine deprivation.
Point Mutation
Point mutations in Rag GTPases or mTOR can mimic constitutive activation or inactivation, allowing precise dissection of leucine-sensing mechanisms.
Knock-in
Knock-in of tagged TFEB or GSK3alpha allows live-cell imaging and biochemical tracking of these proteins during leucine starvation.
Overexpression
Overexpression of Sestrin or TFEB can test sufficiency of these factors to drive adaptation to low leucine.
How EDITGENE Supports cellular response to leucine starvation Research
Researchers studying cellular response to leucine starvation-related genes often need to determine whether a candidate gene is causally involved in sensing, signaling or adaptation. EDITGENE provides CRISPR-based cell models and screening services to accelerate this work.
Contact EDITGENE today to design your custom CRISPR model for cellular response to leucine starvation research.
Frequently Asked Questions About cellular response to leucine starvation
What is GO:1990253?
GO:1990253 is the Gene Ontology term for cellular response to leucine starvation, describing how a cell changes its state or activity when leucine is deprived.
What genes are involved in cellular response to leucine starvation?
Key genes include MTOR, TFEB, GSK3A, SESN1/2, SQSTM1 and Rag GTPases such as RRAGA and RRAGB.
How does leucine starvation affect mTORC1?
Leucine starvation inactivates mTORC1 through the Rag GTPase dimer code, reducing anabolic signaling.
What is the role of TFEB in leucine starvation?
TFEB translocates to the nucleus upon leucine starvation and activates lysosomal and autophagic genes.
Is the leucine starvation response conserved in yeast?
Yes, Schizosaccharomyces pombe shows a specific response to leucine, indicating conservation.
How can I study cellular response to leucine starvation?
Common methods include RNA-seq, Ribo-seq, proteomics, imaging of TFEB and GSK3alpha, and CRISPR knockout models.
What diseases are linked to leucine starvation signaling?
Cancer, neurodegeneration and lysosomal storage disorders are linked to dysregulated leucine sensing and autophagy.
What is the role of GSK3alpha in amino acid starvation?
GSK3alpha forms supramolecular assemblies under amino acid starvation, representing an mTORC1-independent response.
How do Sestrins mediate low-leucine adaptation?
Sestrins detect low leucine and mediate adaptation in Drosophila, linking diet to cellular responses.
Can CRISPR be used to model leucine starvation responses?
Yes, CRISPR knockout, knock-in and overexpression models are widely used to study genes like TFEB, MTOR and SQSTM1.
Conclusion
Cellular response to leucine starvation (GO:1990253) is a central nutrient-sensing process that coordinates mTORC1 inactivation, TFEB activation, autophagy and metabolic reprogramming. Its conservation across eukaryotes and its links to cancer, neurodegeneration and metabolic disease make it a high-value research area. CRISPR-based models and multi-omics approaches continue to reveal new regulators of this response.
References
- 1. Hinze L et al.. 2022. Supramolecular assembly of GSK3α as a cellular response to amino acid starvation.. Mol Cell 82(15):2858-2870.e8 PMID: 35732190
- 2. Settembre C et al.. 2012. A lysosome-to-nucleus signalling mechanism senses and regulates the lysosome via mTOR and TFEB.. EMBO J 31(5):1095-108 PMID: 22343943
- 3. Settembre C et al.. 2013. TFEB controls cellular lipid metabolism through a starvation-induced autoregulatory loop.. Nat Cell Biol 15(6):647-58 PMID: 23604321
- 4. Ohtsuka H et al.. 2022. Response to leucine in Schizosaccharomyces pombe (fission yeast).. FEMS Yeast Res 22(1) PMID: 35325114
- 5. Gu X et al.. 2022. Sestrin mediates detection of and adaptation to low-leucine diets in Drosophila.. Nature 608(7921):209-216 PMID: 35859173
- 6. Chen G et al.. 2021. Monitoring TFEB translocation.. Methods Cell Biol 164:1-9 PMID: 34225908
- 7. Iavazzo M et al.. 2026. TFEB coordinates autophagosome biogenesis and ribophagy during starvation via SQSTM1.. Sci Adv 12(1):eaea9302 PMID: 41477847
- 8. Gollwitzer P et al.. 2022. A Rag GTPase dimer code defines the regulation of mTORC1 by amino acids.. Nat Cell Biol 24(9):1394-1406 PMID: 36097072
