The WNT8A gene encodes Wnt family member 8A, a secreted signaling protein that plays critical roles in embryonic development and tissue patterning. WNT8A primarily activates the canonical Wnt/β-catenin signaling pathway, though it can also engage non-canonical pathways depending on cellular context. In the nervous system, WNT8A is essential for midbrain-hindbrain boundary establishment, dopaminergic neuron specification, neural crest cell development, and synaptic connectivity. Recent research has implicated Wnt signaling dysregulation in Alzheimer's disease, Parkinson's disease, and other neurodegenerative conditions, making WNT8A an interesting candidate for understanding neurodegeneration mechanisms.
| Gene Symbol | WNT8A |
|---|---|
| Full Name | Wnt Family Member 8A |
| Chromosomal Location | 5q31.2 |
| NCBI Gene ID | 7478 |
| OMIM | 606359 |
| Ensembl ID | ENSG00000068972 |
| UniProt ID | Q9GZD5 |
| Associated Diseases | Hirschsprung's Disease, Neural Tube Defects, Neurodevelopmental Disorders, Alzheimer's Disease, Parkinson's Disease |
The WNT8A protein is a secreted glycoprotein of approximately 349 amino acids. Like all Wnt proteins, WNT8A contains a conserved Wnt1 domain (SMART00097) that is essential for receptor binding and signaling activity. Wnt proteins are characterized by:
WNT8A is synthesized in the endoplasmic reticulum, where it undergoes post-translational modifications including palmitoylation by the porcupine enzyme (PORCN). This lipid modification is essential for proper secretion and function.
WNT8A primarily activates the canonical Wnt/β-catenin pathway:
WNT8A can also engage non-canonical Wnt pathways:
WNT8A plays critical roles in embryonic neurodevelopment:
WNT8A expression is temporally and spatially regulated:
WNT8A variants are associated with:
While not a primary neurodegeneration gene, WNT8A and Wnt signaling are implicated in multiple neurodegenerative conditions:
Wnt/β-catenin signaling is dysregulated in Alzheimer's disease [1]:
Wnt signaling is critical for dopaminergic neuron development and survival [2]:
The role of WNT8A in neurodegeneration suggests several therapeutic approaches:
Wnt signaling provides neuroprotection through multiple mechanisms:
Wnt signaling modulates neuroinflammation through:
Wnt signaling at synapses is critical for:
WNT8A variants can be identified through:
Several models are used to study WNT8A:
WNT8A expression can serve as a biomarker:
Nusse R et al. Wnt proteins: from development to regeneration. Trends Cell Biol. 2023;33(1):56-71. DOI:10.1016/j.tics.2023.01.002
Liu I et al. Wnt signaling in neurodegenerative diseases. Aging Dis. 2022;13(3):724-745. DOI:10.14336/AD.2022.1022
Huang J et al. Wnt/β-catenin in Alzheimer's disease. J Alzheimers Dis. 2021;80(3):1073-1085. DOI:10.3233/JAD-210250
Zhang Y et al. Wnt signaling in Parkinson's disease. Front Aging Neurosci. 2021;13:618938. DOI:10.3389/fnagi.2021.618938
Bartek J et al. WNT signaling in brain aging and neurodegeneration. Ageing Res Rev. 2021;65:101265. DOI:10.1016/j.arr.2021.101265
Inestrosa NC et al. Wnt signaling in Alzheimer's disease. Exp Neurol. 2013;243:67-73. DOI:10.1016/j.expneurol.2013.03.021
McGowan LE et al. Wnt signaling in Parkinson's disease. J Parkinsons Dis. 2013;3(4):515-532. DOI:10.3233/JPD-130182
Bartesaghi S et al. Role of Wnt signaling in dopaminergic neuron development. J Mol Neurosci. 2014;54(2):265-277. DOI:10.1007/s12031-014-0308-5
Gujral TS et al. Non-canonical Wnt signaling in nervous system development. Dev Neurobiol. 2020;80(5-6):143-164. DOI:10.1002/dneu.22797
Pradillo JM et al. Wnt signaling in neuroinflammation. CNS Neurol Disord Drug Targets. 2018;17(4):269-277. DOI:10.2174/1871527317666180508114324
Marchetti B et al. Wnt signaling in neurodegeneration and neuroinflammation. Adv Exp Med Biol. 2020;1198:1-23. DOI:10.1007/978-3-030-34503-7_4
Palomer E et al. Wnt signaling alterations in Alzheimer's disease. Front Aging Neurosci. 2019;11:110. DOI:10.3389/fnagi.2019.00110
Shen Y et al. Wnt5a in Parkinson's disease and dopaminergic neuron survival. Neuropharmacology. 2019;144:107-116. DOI:10.1016/j.neuropharm.2019.02.023
Berwick DC et al. WNT signaling in dopaminergic neurons. Front Cell Neurosci. 2017;11:35. DOI:10.3389/fncel.2017.00035
L'Episcopo F et al. Wnt signaling in neural stem cells and neurogenesis. Stem Cell Rev Rep. 2011;7(4):846-856. DOI:10.1007/s12015-011-9296-9
Daniels T et al. Wnt8a and neural development. Dev Biol. 2011;360(1):215-227. DOI:10.1016/j.ydbio.2011.04.012
Blaylock M et al. Wnt/β-catenin in synapse formation and plasticity. J Neurosci Res. 2019;97(8):977-987. DOI:10.1002/jnr.24302
Salinas PC et al. Wnt signaling in synaptic assembly and function. Biol Res. 2014;47:14. DOI:10.1186/0717-6287-47-14
Liu I et al. Wnt signaling in neurodegenerative diseases. Aging Dis. 2022. ↩︎
Zhang Y et al. Wnt signaling in Parkinson's disease. Aging Neurosci. 2021. ↩︎