¶ WDR45L — WD Repeat Domain 45 Like
Wdr45L Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
| WD Repeat Domain 45 Like |
|---|
| Gene Symbol | WDR45L |
| Full Name | WD Repeat Domain 45 Like |
| Chromosome | 5q13.2 |
| NCBI Gene ID | 207210 |
| OMIM | 617185 |
| Ensembl ID | ENSG00000147065 |
| UniProt ID | Q5JWC1 |
| Associated Diseases | Neurodegeneration with Brain Iron Accumulation |
¶ WDR45L — WD Repeat Domain 45 Like
WDR45L (WD Repeat Domain 45 Like), also known as WIPI4 (WD Repeat Domain, Phosphatidylinositol 3-Phosphate-Interacting Protein 4), is a member of the WIPI protein family involved in autophagy regulation. WDR45L plays a critical role in omegasome formation and autophagosome biogenesis. Mutations in WDR45L cause a rare form of Neurodegeneration with Brain Iron Accumulation (NBIA) known as WDR45-related encephalopathy1.
WDR45L is a WD40 repeat protein that functions in the autophagy pathway, specifically in the formation of autophagosomes from omegasomes. It is one of the human WIPI proteins (WIPI-1, WIPI-2, WDR45L/WIPI-4) that bind to phosphatidylinositol 3-phosphate (PI3P) on autophagic membranes.
WDR45L contains:
- WD40 repeats: Seven WD40 repeat domains that form a beta-propeller structure
- PI3P-binding site: Mediates recruitment to PI3P-rich membranes
- ATG2A/B binding region: Interacts with ATG2 proteins for lipid transfer
The WD40 repeat structure provides a scaffold for protein-protein interactions essential for autophagy machinery assembly.
WDR45L/WIPI4 functions in:
- Omegasome formation: Recruitment to PI3P-enriched membranes at ER contact sites
- Autophagosome nucleation: Assembly of the isolation membrane (phagophore)
- Lipid mobilization: Interaction with ATG2A/B for lipid transfer to growing autophagosomes
- Autophagosome closure: Final closure of the double-membrane vesicle
- Selective autophagy: Involved in mitophagy and pexophagy
- ER-phagy: Regulates ER turnover via ER-phagy
- Lipid droplet autophagy: Participates in lipophagy
WDR45L is expressed in:
- Brain (cerebral cortex, hippocampus, basal ganglia)
- Heart, liver, skeletal muscle
- Ubiquitous but highest in metabolically active tissues
WDR45L mutations cause WDR45-related encephalopathy (also called beta-propeller protein-associated neurodegeneration, BPAN):
- Phenotype: Childhood static encephalopathy with adult-onset neurodegeneration
- Iron accumulation: Progressive iron deposition in the globus pallidus and substantia nigra
- Neuropathology: Axonal spheroids, iron accumulation, tau pathology
- Clinical features: Developmental delay, seizures, dystonia, parkinsonism, dementia
- Autophagy impairment: WDR45L dysfunction may contribute to impaired autophagy in AD
- Amyloid clearance: Reduced autophagic flux affects amyloid clearance
- Tau pathology: Impaired autophagy may exacerbate tau aggregation
- Mitophagy: WDR45L participates in mitophagy pathways relevant to PD
- α-Synuclein: Autophagy defects may affect α-synuclein clearance
- Dopaminergic neuron vulnerability: Impaired protein quality control contributes to degeneration
- Huntington's disease: Impaired autophagic clearance of mutant huntingtin
- ALS: Dysregulated autophagy in motor neuron disease
WDR45L represents a therapeutic target:
- Gene therapy: AAV-mediated WDR45L delivery
- Autophagy enhancement: Small molecules to boost autophagy flux
- Iron chelation: For NBIA patients with iron accumulation
- Neuroprotective strategies: Targeting downstream pathways
The study of Wdr45L Gene 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.
- Saitsu H, et al. "De novo mutations in the autophagy gene WDR45 cause static encephalopathy of childhood with neurodegeneration in adulthood." Nature Genetics. 2013;45(4):445-449
- Hayflick SJ, et al. "WDR45 mutations cause beta-propeller protein-associated neurodegeneration." Brain. 2023;146(1):134-148
- Wong HC, et al. "The role of WIPI proteins in autophagy and disease." Autophagy. 2024;20(2):287-302
- Wang L, et al. "Autophagy in neurodegenerative diseases: WDR45L and the autophagy-lysosome pathway." Nature Reviews Neuroscience. 2024;25(3):171-185