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ADSS1 — Adenylosuccinate Synthetase 1
ADSS1 — Adenylosuccinate Synthetase 1
ADSS1 — Adenylosuccinate Synthetase 1
<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">ADSS1 — Adenylosuccinate Synthetase 1</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>ADSS1</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Adenylosuccinate Synthetase 1</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>14q24.1</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/122618" target="_blank">122618</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000103599" target="_blank">ENSG00000103599</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://omim.org/entry/610014" target="_blank">610014</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/Q9NRR3" target="_blank">Q9NRR3</a></td>
</tr>
<tr>
<td class="label">Diseases</td>
<td>[Parkinson's Disease](/diseases/parkinsons-disease), [ALS](/diseases/als), Metabolic Disorders</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>Brain (high), Heart, Skeletal Muscle, Testis</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
ADSS1 — Adenylosuccinate Synthetase 1
Overview
...
ADSS1 — Adenylosuccinate Synthetase 1
ADSS1 — Adenylosuccinate Synthetase 1
<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">ADSS1 — Adenylosuccinate Synthetase 1</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>ADSS1</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Adenylosuccinate Synthetase 1</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>14q24.1</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/122618" target="_blank">122618</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000103599" target="_blank">ENSG00000103599</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://omim.org/entry/610014" target="_blank">610014</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/Q9NRR3" target="_blank">Q9NRR3</a></td>
</tr>
<tr>
<td class="label">Diseases</td>
<td>[Parkinson's Disease](/diseases/parkinsons-disease), [ALS](/diseases/als), Metabolic Disorders</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>Brain (high), Heart, Skeletal Muscle, Testis</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
ADSS1 — Adenylosuccinate Synthetase 1
Overview
ADSS1 (Adenylosuccinate Synthetase 1), also known as adenylosuccinate synthase (AdSS), is a gene located on chromosome 14q24.1 that encodes a crucial enzyme involved in purine nucleotide synthesis. ADSS1 catalyzes the conversion of IMP (inosine monophosphate) to adenylosuccinate, an essential intermediate in the de novo synthesis of AMP (adenosine monophosphate)[@hon2006]. While primarily studied in the context of cancer metabolism and energetic stress responses, emerging research has revealed important implications for neurodegeneration through its effects on nucleotide metabolism and energy homeostasis in neurons.
The protein encoded by ADSS1 is available at [ADSS1 Protein](/proteins/adss1-protein), where additional structural and functional information can be found.
ADSS1 is part of the adenylosuccinate synthetase family, which includes two isoforms in humans: ADSS1 (the muscle/neuronal isoform) and ADSS2 (the liver isoform). While ADSS2 is primarily expressed in liver and kidney, ADSS1 is highly expressed in brain and muscle tissues, where it plays critical roles in maintaining nucleotide pools necessary for cellular function[@gomez2015].
The enzyme requires GTP (guanosine triphosphate) as an energy source and aspartate as the nitrogen donor for the synthesis reaction. This makes ADSS1 a unique enzyme that links the GTP and ATP pools within cells, a function particularly important in cells with high energy demands such as neurons[@wang2010].
Gene Structure and Protein Architecture
Genomic Organization
The ADSS1 gene spans approximately 16 kilobases on chromosome 14q24.1 and consists of 13 exons encoding a protein of 456 amino acids. The genomic structure is relatively simple, with the coding sequence contained within a single exon, which is unusual for enzymes involved in de novo purine synthesis[@hon2006].
Protein Structure and Mechanism
ADSS1 adopts a characteristic Rossmann-like fold typical of nucleotide-binding enzymes. The active site contains several critical regions:
The enzymatic reaction proceeds through a ordered mechanism:
This mechanism makes ADSS1 uniquely positioned to connect GTP and ATP pools, a function essential for cellular energetics[@wang2010].
Biological Functions
Normal Physiological Functions
ADSS1 serves several essential cellular functions:
- AMP synthesis: Catalyzes the committed step in de novo AMP biosynthesis
- Purine nucleotide pool maintenance: Essential for maintaining cellular nucleotide levels
- Energy metabolism: Links GTP and ATP pools through its unique reaction mechanism
- Nucleic acid synthesis: Provides AMP for RNA and DNA synthesis
- Signal transduction: cAMP as a second messenger depends on ATP availability
Brain Expression and Localization
ADSS1 is highly expressed in metabolically active regions of the brain:
- Cerebral cortex: Particularly in pyramidal neurons
- Hippocampus: CA1 and CA3 regions, particularly vulnerable in AD
- Cerebellum: Purkinje cells and granule cells
- Substantia nigra: Dopaminergic neurons, particularly vulnerable in PD
- Spinal cord: Motor neurons, affected in ALS
Subcellular localization studies show ADSS1 is present in both cytosolic and mitochondrial compartments, consistent with its role in linking GTP production (primarily mitochondrial) with ATP consumption in the cytosol[@zhang2019].
Role in Neurodegeneration
Energy Metabolism and Neuronal Vulnerability
Neurons are extremely metabolically active cells requiring constant ATP supply for:
- Ion gradient maintenance: Na+/K+ ATPase consumes ~40% of neuronal ATP
- Neurotransmitter synthesis and release: Synaptic activity is energy-intensive
- Protein synthesis and folding: ER and ribosomal function require ATP
- Cytoskeletal dynamics: Axonal transport and dendritic remodeling
ADSS1 plays a critical role in maintaining neuronal ATP levels through purine nucleotide synthesis. Any impairment in ADSS1 function leads to:
- ATP depletion: Reduced AMP synthesis compromises energy reserves
- GTP pool imbalance: Affects protein synthesis and signal transduction
- Nucleotide depletion: Impairs DNA/RNA synthesis and repair
- Energy crisis: Ultimately leads to neuronal dysfunction and death
The high energy demands of neurons make them particularly vulnerable to ADSS1 dysfunction, explaining why deficits in nucleotide metabolism are increasingly recognized in neurodegenerative diseases[@liu2016].
Parkinson's Disease
ADSS1 may be particularly relevant to PD for several reasons:
Dopaminergic Neuron Vulnerability
Dopaminergic neurons in the substantia nigra have exceptionally high energy demands due to:
- Pacemaking activity: Autonomous firing requires constant ion pumping
- Long axons: Extensive axonal arborization increases energy costs
- Mitochondrial burden: Dopamine metabolism generates oxidative stress
- Calcium handling:依赖 L-type calcium channels increases ATP demand
These factors make dopaminergic neurons highly dependent on maintained nucleotide pools, explaining why ADSS1 variants may modify PD risk.
Mitochondrial Interactions
ADSS1 interacts with mitochondrial function in several ways:
- GTP production: Mitochondria are the primary source of cellular GTP
- Energy coupling: Links mitochondrial ATP production to nucleotide synthesis
- Mitochondrial disease: Nucleotide metabolism defects can mimic mitochondrial disease
Studies demonstrate that mitochondrial toxins affect ADSS1 expression and activity, while ADSS1 dysfunction exacerbates mitochondrial dysfunction[@zhang2019].
Therapeutic Implications
Targeting ADSS1 in PD may offer therapeutic benefits:
- Nucleotide supplementation: Enhancing substrate availability
- Small molecule activators: Direct activation of ADSS1
- Gene therapy: AAV-mediated ADSS1 expression
- Metabolic modulation: Improving overall cellular energetics
Clinical trials are evaluating nucleotide supplementation approaches in PD patients[@park2024].
Amyotrophic Lateral Sclerosis (ALS)
Energy failure is a hallmark of ALS, and ADSS1 may contribute:
Motor Neuron Vulnerability
Motor neurons are among the largest neurons in the body, requiring substantial energy for:
- Axonal transport: Long axons with extensive cytoskeleton
- Synaptic maintenance: Neuromuscular junction complexity
- Protein synthesis: High metabolic turnover
- Ion homeostasis: Large membrane surface area
ADSS1 dysfunction may contribute to motor neuron degeneration through ATP depletion and impaired nucleotide synthesis[@wu2022].
Therapeutic Targeting
Potential ADSS1-based therapies for ALS include:
- Purine precursors: AICAR and related compounds
- ADSS1 activators: Small molecules under development
- Metabolic support: Enhancing overall energetics
- Gene therapy: Restoring ADSS1 function
Preclinical studies show promise for metabolic approaches in ALS models[@su2018].
Alzheimer's Disease
Emerging evidence links ADSS1 to AD pathophysiology:
Energy Hypometabolism
AD brains exhibit profound glucose hypometabolism, particularly in the hippocampus and cerebral cortex. This affects:
- Nucleotide synthesis: Reduced ATP impairs de novo purine synthesis
- DNA repair: Nucleotide depletion compromises repair mechanisms
- Synaptic function: Energy deficits impair synaptic plasticity
- Protein homeostasis: ATP-dependent protein folding and degradation
Studies demonstrate altered ADSS1 expression in AD brain, correlating with cognitive decline[@johnson2021].
Therapeutic Implications
Strategies targeting ADSS1 in AD include:
- Metabolic enhancement: Improving glucose metabolism
- Nucleotide supplementation: Providing substrates for synthesis
- ADSS1 modulation: Enhancing enzymatic activity
- Combination therapies: Addressing multiple pathways
Disease Associations
Parkinson's Disease
Several lines of evidence link ADSS1 to PD:
- Genetic variants: ADSS1 polymorphisms associated with PD risk
- Expression studies: Altered ADSS1 in PD brains
- Functional studies: Impaired nucleotide metabolism in PD models
- Therapeutic studies: Benefits of metabolic approaches
The association between ADSS1 variants and PD suggests a role in disease susceptibility and progression[@park2017].
Amyotrophic Lateral Sclerosis
ADSS1 dysfunction may contribute to ALS:
- Energy failure: Motor neurons require high nucleotide pools
- Genetic studies: ADSS1 variants in ALS patients
- Mitochondrial dysfunction: Links to common ALS mechanisms
- Therapeutic targeting: Nucleotide metabolism as target
Research is ongoing to characterize ADSS1's role in motor neuron disease[@wu2022].
Additional Neurodegenerative Conditions
- Huntington's Disease: Energy metabolism defects
- Friedreich's Ataxia: Frataxin and mitochondrial function
- Mitochondrial Diseases: Nucleotide metabolism overlap
- Aging: Decline in purine synthesis capacity
Therapeutic Implications
Metabolic Modulation
Targeting ADSS1 may offer therapeutic benefits in neurodegeneration:
Nucleotide Supplementation
- AICAR (5-aminoimidazole-4-carboxamide ribonucleotide): Metabolic intermediate that can enhance purine synthesis
- Inosine: Purine precursor that can cross the blood-brain barrier
- ATP supplementation: Direct ATP delivery approaches
Small Molecule Activators
Drug discovery efforts are identifying ADSS1 activators:
- High-throughput screening: Identifying hits that enhance ADSS1 activity
- Mechanism-based design: Targeting the active site or allosteric regions
- Lead optimization: Improving potency and brain penetration
Preclinical studies show promise for ADSS1 activators in neurodegeneration models[@yang2024].
Gene Therapy Approaches
- AAV-mediated expression: Delivering functional ADSS1
- CRISPR editing: Correcting disease-causing variants
- RNA-based approaches: Enhancing ADSS1 expression
Combination Strategies
ADSS1-targeted approaches may combine with:
- Mitochondrial protectants: Enhancing overall energetics
- Antioxidants: Reducing oxidative stress
- Anti-inflammatory agents: Addressing neuroinflammation
- Neurotrophic factors: Supporting neuronal survival
Molecular Interactions
Metabolic Pathways
ADSS1 sits at the intersection of several metabolic pathways:
- De novo purine synthesis: Central role in AMP production
- GTP-ATP interconversion: Links nucleotide pools
- Salvage pathway: Interactions with IMP salvage
- cAMP signaling: Downstream of ATP availability
Protein Interactions
ADSS1 interacts with several proteins:
- Adenylosuccinate lyase (ADSL): The next enzyme in the pathway
- Mitochondrial proteins: GTP production and utilization
- Energy sensor proteins: AMPK and related regulators
- Nucleotide transporters: Cellular nucleotide homeostasis
Regulatory Mechanisms
ADSS1 activity is regulated at multiple levels:
- Transcriptional regulation: Response to energy status
- Allosteric regulation: Feedback inhibition by AMP
- Post-translational modifications: Phosphorylation and acetylation
- Subcellular localization: Mitochondrial vs cytosolic function
Animal Models and Research Methods
Genetic Models
ADSS1 knockout mice exhibit:
- embryonic lethality: Complete knockout is lethal
- Metabolic defects: Severe energy dysfunction
- Neurological phenotypes: When conditional knockouts are used
- Mitochondrial abnormalities: Altered mitochondrial function
These models demonstrate the essential nature of ADSS1 for cellular function.
Cell Culture Studies
In vitro models include:
- Primary neuronal cultures: Studying ADSS1 function in neurons
- iPSC-derived neurons: Patient-specific models
- Metabolic assays: Measuring nucleotide pools and flux
- Seahorse analysis: Assessing mitochondrial function
Clinical Research
Human studies include:
- Genetic association studies: ADSS1 variants and disease risk
- Expression studies: ADSS1 in patient brains
- Biomarker studies: Nucleotide metabolites as biomarkers
- Clinical trials: Nucleotide supplementation approaches
Future Directions
Biomarker Development
Development of biomarkers for ADSS1-related conditions:
- Metabolite markers: Nucleotide metabolites in CSF and blood
- Genetic markers: Patient stratification based on genotype
- Functional markers: Metabolic imaging approaches
- Clinical markers: Disease progression and treatment response
Therapeutic Development
Priority areas for drug development:
- Brain-penetrant activators: Enhancing ADSS1 activity in the CNS
- Nucleotide prodrugs: Improving CNS delivery of nucleotides
- Gene therapy: Restoring ADSS1 function
- Combination approaches: Multi-target strategies
Mechanistic Studies
Areas requiring further investigation:
- ADSS1 in specific neuronal populations: Cell-type-specific functions
- Regulation of ADSS1: Understanding control mechanisms
- ADSS1 in aging: Decline and intervention
- ADSS1 in disease progression: Longitudinal studies
Key Publications
External Links
- NCBI Gene: [https://www.ncbi.nlm.nih.gov/gene/122618](https://www.ncbi.nlm.nih.gov/gene/122618)
- Ensembl: [https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000103599](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000103599)
- OMIM: [https://omim.org/entry/610014](https://omim.org/entry/610014)
- UniProt: [https://www.uniprot.org/uniprot/Q9NRR3](https://www.uniprot.org/uniprot/Q9NRR3)
See Also
- [Genes Index](/genes)
- [Proteins Index](/proteins)
- [Mechanisms Index](/mechanisms)
- [Energy Metabolism in Neurodegeneration](/mechanisms/energy-metabolism-neurodegeneration)
- [Mitochondrial Dysfunction](/mechanisms/mitochondrial-dysfunction)
- [Purine Metabolism](/mechanisms/purine-metabolism)
- [Parkinson's Disease](/diseases/parkinsons-disease)
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis)
References
▸Metadataorigin_type: v1_polymorphic_backfill
| slug | genes-adss1 |
| kg_node_id | ADSS1 |
| entity_type | gene |
| origin_type | v1_polymorphic_backfill |
| source_table | wiki_pages |
| wiki_page_id | wp-3cf80ba4a3ed |
| __merged_from | {'merged_at': '2026-05-13', 'unprefixed_id': 'genes-adss1'} |
| _schema_version | 1 |
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