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Target intelligence / Profile preview
WD repeat-containing protein 81 (WDR81)
- Target
- WDR81
- Molecular classification
- Other (WD-repeat protein family, protein phosphatase regulatory subunits, multi-domain transmembrane protein)
01
Overview
WD repeat-containing protein 81 (WDR81) is a multi-domain transmembrane protein predominantly expressed in the brain, where it plays a key role in endolysosomal trafficking, autophagic degradation of ubiquitinated proteins, and intracellular protein quality control. WDR81 regulates vesicular transport and is essential for proper cell cycle progression and neurodevelopment, suppressing PI3K-III activity to control endosomal phosphatidylinositol 3-phosphate (PtdIns3P) levels, and thereby influencing SARA-dependent TGFβ signaling crucial for adult neurogenesis. Mutations in WDR81 are causative for CAMRQ2 syndrome (cerebellar ataxia with mental retardation and quadrupedal locomotion), congenital hydrocephalus, and other brain developmental pathologies. Experimentally, WDR81 deficiency disrupts endolysosomal degradation of membrane proteins and affects cell division by delaying mitosis in neural progenitors. No approved drugs specifically target WDR81, and it is not currently considered a direct therapeutic target, but it is mechanistically important in both neurodevelopmental disease and potentially in cancer biology through effects on autophagy and exosome secretion.
- Other names
- WD repeat domain 81FLJ33817PPP1R166CAMRQ2SORF-2protein phosphatase 1 regulatory subunit 166CHMRQHYC3
02
Mechanism of action
Not applicable (no drugs directly targeting WDR81 known in the literature)
03
Biological functions
Vesicular traffickingEndolysosomal transportAutophagic clearance (coordination of autophagy, especially clearance of ubiquitinated proteins)Regulation of cell cycle and mitotic progressionRegulation of endosomal phosphatidylinositol 3-phosphate (PtdIns3P) levelsRegulation of adult hippocampal neurogenesisNegative regulation of PI3K-III complex activityIntracellular protein quality control
04
Disease associations
Neurodevelopmental disorders (including cerebellar ataxia, CAMRQ2 syndrome)Intellectual disabilityDisequilibrium syndromesMicrocephaly and congenital hydrocephalusGlioblastoma (implicated in tumor biology through modulation of autophagy and exosome secretion)
05
Safety considerations
No safety concerns reported for pharmacological targeting, as there are no known direct WDR81-targeting drugsLoss-of-function mutations cause severe neurodevelopmental phenotypes (e.g., ataxia, microcephaly)
06
Biomarkers
Mutations in WDR81 serve as biomarkers for CAMRQ2 syndrome, cerebellar ataxia, and certain neurodevelopmental disorders
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