| Property | Value |
|---|---|
| Gene Symbol | WDPCP |
| Full Name | WD Repeat Containing Polypeptide |
| Chromosomal Location | 2p15 |
| NCBI Gene ID | 51026 |
| Ensembl ID | ENSG00000143977 |
| UniProt ID | Q8WZ73 |
| Encoded Protein | WD Repeat Containing Polypeptide |
| Protein Family | WD40 repeat protein family |
| Protein Length | 724 amino acids |
| Molecular Weight | ~79 kDa |
| Associated Diseases | Bardet-Biedl Syndrome, Congenital Heart Disease, Ciliopathies, Autism Spectrum Disorder |
WDPCP (WD Repeat Containing Polypeptide) encodes a protein belonging to the WD40 repeat protein family, a large group of regulatory proteins characterized by conserved WD40 repeat motifs that form beta-propeller structures. WDPCP is a critical component of the planar cell polarity (PCP) signaling pathway and plays essential roles in ciliogenesis, autophagy regulation, and cellular morphogenesis[1].
The planar cell polarity pathway is a fundamental developmental signaling system that coordinates cell orientation and tissue patterning during embryogenesis. In the central nervous system (CNS), PCP signaling is crucial for neural tube closure, neuronal migration, axonal guidance, and the establishment of brain architecture. WDPCP serves as a key regulator of these processes, and its dysfunction has been implicated in various neurodevelopmental and neurodegenerative conditions.
Research over the past decade has established connections between WDPCP and several aspects of neuronal biology relevant to neurodegeneration. These include:
The WDPCP gene is located on chromosome 2p15, a region that has undergone significant evolutionary conservation. The gene spans approximately 25 kilobases and consists of 14 exons that encode a 724-amino acid protein.
WDPCP is evolutionarily conserved across eukaryotes, with orthologs identified in:
The conservation of WDPCP across diverse species underscores its fundamental importance in cellular processes. The WD40 repeat domain, which characterizes this protein family, is particularly well-conserved, suggesting that the structural framework for protein-protein interactions is essential to WDPCP function.
The WDPCP protein contains six WD40 repeats at its C-terminus, each approximately 44-60 amino acids in length. These repeats form a characteristic beta-propeller structure with six blades, providing a platform for protein-protein interactions. The propeller architecture allows WDPCP to:
N-terminal Region (1-200) — Low complexity, regulatory
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Middle Region (200-400) — Proline-rich, SH3-binding motifs
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C-terminal WD40 Domain (400-724) — Six WD40 repeats, protein interactions
The N-terminal region contains low-complexity sequences that may undergo regulatory modifications. The middle region includes proline-rich sequences that potentially interact with SH3 domain-containing proteins. The C-terminal WD40 domain mediates the majority of protein-protein interactions.
The planar cell polarity (PCP) pathway is one of two major Wht signaling pathways (the other being the canonical Wnt/β-catenin pathway). PCP signaling controls the orientation of cells within the plane of a tissue, coordinating collective cell movements and establishing tissue polarity.
Key PCP components include:
WDPCP localizes to the plasma membrane and centrosome/basal body, positioning it to coordinate PCP signaling with cellular architecture. Studies demonstrate that WDPCP:
The planar cell polarity pathway is essential for:
Primary cilia are antenna-like organelles that project from the cell surface and serve as critical signaling hubs. They detect mechanical and chemical signals from the environment and coordinate intracellular signaling pathways, including:
In neurons, primary cilia are present on most cell types and play important roles in:
WDPCP is essential for primary cilia formation through its role in basal body docking and ciliary membrane trafficking[2]. Research demonstrates that:
The ciliogenesis function of WDPCP is particularly important because primary cilia serve as organizing centers for multiple signaling pathways relevant to neurodevelopment and neurodegeneration.
WDPCP mutations cause or contribute to ciliopathies, a group of disorders characterized by ciliary dysfunction. The Bardet-Biedl syndrome (BBS) phenotype in particular involves:
Neurodevelopmental manifestations include:
Autophagy (macroautophagy) is a cellular recycling process that degrades damaged organelles, protein aggregates, and intracellular pathogens. Autophagy is essential for cellular homeostasis and is particularly important in neurons due to their post-mitotic nature and high metabolic demands.
The autophagy process involves:
Research by Badgley et al. (2015) established WDPCP as a regulator of autophagosome formation[1:1]. The mechanism involves:
Autophagy dysfunction is a central feature of neurodegenerative diseases:
By regulating autophagosome formation, WDPCP may influence the clearance of:
This connection between WDPCP and autophagy regulation has significant implications for understanding neurodegeneration mechanisms.
WDPCP is expressed in multiple tissues, with particularly high expression in:
| Tissue | Expression Level |
|---|---|
| Brain | High (cortex, hippocampus, cerebellum) |
| Kidney | High |
| Heart | Moderate |
| Lung | Moderate |
| Retina | High |
| Testis | High |
Within the brain, WDPCP shows cell-type-specific expression:
During development, WDPCP expression peaks during:
In the adult brain, WDPCP expression is maintained at moderate levels, suggesting ongoing functions in neuronal homeostasis.
WDPCP has been implicated in Alzheimer's disease through multiple mechanisms:
Gene-wide association studies (GWAS) have identified WDPCP variants as potential modifiers of AD risk, though the relationship requires further validation.
In Parkinson's disease, WDPCP connections include:
WDPCP mutations are associated with:
The multifaceted roles of WDPCP in neurodegeneration suggest several therapeutic approaches:
WDPCP interacts with several key proteins:
| Partner | Function | Interaction Type |
|---|---|---|
| Vangl1/2 | PCP signaling | Direct binding |
| Dvl | Wnt/PCP signaling | Scaffold |
| Atg proteins | Autophagy | Regulatory |
| Basal body proteins | Ciliogenesis | Localization |
| Lipid membranes | Membrane association | Lipid binding |
WDPCP serves as a signaling hub that integrates multiple pathways:
Badgley MA, et al. WDPCP regulates planar cell polarity and autophagosome formation in vivo. Dev Cell. 2015. ↩︎ ↩︎
Kim J, et al. The WD40 repeat protein Wdpcp localizes to the basal body and participates in division of mouse retinal progenitor cells. Dev Biol. 2010. ↩︎