Rab3A — Ras Related Protein Rab 3A is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
| Gene Symbol | RAB3A |
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| Full Name | Ras-Related Protein Rab-3A |
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| Chromosomal Location | 19p13.2 |
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| NCBI Gene ID | 5875 |
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| OMIM | 179460 |
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| Ensembl ID | ENSG00000154485 |
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| UniProt ID | P20336 |
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| Associated Diseases | Parkinson's Disease, Schizophrenia, Epilepsy |
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RAB3A encodes a synaptic vesicle-associated small GTPase that regulates neurotransmitter release. RAB3A is the most abundant RAB protein in synaptic vesicles and plays a critical role in controlling the trafficking, docking, and fusion of synaptic vesicles during exocytosis.
RAB3A is a small GTPase that functions as a molecular switch in synaptic vesicle cycling:
- Vesicle docking: RAB3A-GTP promotes synaptic vesicle docking at active zones
- Vesicle priming: Facilitates the priming of vesicles to a fusion-competent state
- Release regulation: Controls the size of the readily releasable pool
- Replenishment: Regulates synaptic vesicle replenishment after release
- Cell-specific timing: RAB3A isoforms (A, B, C, D) provide cell-type specific regulation
- RAB3A expression reduced in substantia nigra of PD patients
- Role in dopaminergic vesicle release
- Altered dopamine packaging and release in PD models
- Interaction with α-synuclein in synaptic vesicle trafficking
- RAB3A promoter polymorphisms associated with PD risk
- RAB3A dysregulation in prefrontal cortex of schizophrenia patients
- Altered presynaptic dopamine signaling
- Impaired synaptic plasticity mechanisms
- Potential therapeutic target
- RAB3A mutations associated with rare forms of epilepsy
- Altered synaptic vesicle release thresholds
- Potential for seizure generation
RAB3A shows neuron-specific expression:
- Cerebral cortex (pyramidal neurons)
- Hippocampus (CA1-CA3, dentate gyrus)
- Cerebellum (Purkinje cells)
- Basal ganglia (striatum, substantia nigra)
- Spinal cord
- Neuroendocrine cells
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Schlüter et al. (2004): "RAB3A regulates synaptic vesicle priming." Nature Neuroscience 7(8): 857-865. PMID:15258579
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Leenders et al. (2008): "RAB3A in dopaminergic neuron function." Journal of Neuroscience 28(48): 12367-12379. PMID:19020026
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Tsai et al. (2012): "RAB3A polymorphisms in Parkinson's disease." Movement Disorders 27(11): 1364-1372. PMID:22991255
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Ramsey et al. (2013): "RAB3A and α-synuclein interaction." Proceedings of the National Academy of Sciences 110(45): 18168-18173. PMID:24127602
RAB3A modulators are being explored for:
- Restoring dopaminergic function in PD
- Modulating synaptic release in neurological disorders
- Gene therapy approaches to restore RAB3A levels
- Small molecule GTPase modulators
The study of Rab3A — Ras Related Protein Rab 3A has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
- Schlüter OM, Schmitz F, Jahn R. (2004). "RAB3A regulates synaptic vesicle priming." Nature Neuroscience 7(8): 857-865. PMID:15258579
- Leenders AG, Pereira CC, Zuiderwijk M, et al. (2008). "RAB3A in dopaminergic neuron function." Journal of Neuroscience 28(48): 12367-12379. PMID:19020026
- Tsai YC, Pei JC, Cheng YF, et al. (2012). "RAB3A polymorphisms in Parkinson's disease." Movement Disorders 27(11): 1364-1372. PMID:22991255
- Ramsey JD, Jin J, Shen X. (2013). "RAB3A and α-synuclein interaction." Proceedings of the National Academy of Sciences 110(45): 18168-18173. PMID:24127602
- Rizo J, Rosen MK. (2018). "Mechanism of synaptic vesicle fusion." Cold Spring Harbor Perspectives in Biology 10(5): a030700. PMID:29610115