PARD6A (Partitioning Defect 6 Par-6 Family Cell Polarity Protein Alpha) is a core component of the PAR3/PAR6/aPKC polarity complex that regulates cell polarity, asymmetric division, and synaptic function. Located at chromosome 5q31.1, PARD6A encodes a 345-amino acid scaffolding protein that interacts with small GTPases (Cdc42, Rac1) and protein kinases (aPKC, PKCζ) to coordinate cytoskeletal dynamics and membrane trafficking 1.
PARD6A has emerged as a protein of interest in neurodegeneration research due to its critical roles in neuronal polarity, synaptic plasticity, and protein trafficking—processes that are disrupted in Alzheimer's disease (AD) and Parkinson's disease (PD) 2.
| Feature | Value |
|---|---|
| Gene Symbol | PARD6A |
| Full Name | Partitioning Defect 6 Par-6 Family Cell Polarity Protein Alpha |
| Chromosomal Location | 5q31.1 |
| NCBI Gene ID | 53600 |
| OMIM ID | 607949 |
| Ensembl ID | ENSG00000102908 |
| UniProt ID | Q9Y3D8 |
| Protein Length | 345 amino acids |
| Molecular Weight | ~37 kDa |
PARD6A is a central scaffold protein in the PAR3/PAR6/aPKC complex, which regulates:
PARD6A contains a PDZ domain that binds to active (GTP-bound) forms of Cdc42 and Rac1, enabling polarity complex recruitment to specific membrane domains 3. This interaction is essential for:
PARD6A recruits atypical protein kinase C (aPKC/PKCζ) to the polarity complex, where it phosphorylates downstream substrates including:
PARD6A plays a critical role in establishing and maintaining neuronal polarity:
At synapses, PARD6A regulates:
Research has shown that PARD6A knockdown impairs synaptic transmission and plasticity in hippocampal neurons 4.
During cortical development, PARD6A guides neuronal migration by:
PARD6A is implicated in AD pathogenesis through several mechanisms:
In PD, PARD6A dysfunction may contribute to:
Alterations in PARD6A expression or function have been linked to:
PARD6A participates in critical signaling pathways:
PARD6A-related pathways represent therapeutic targets:
PARD6A expression changes may serve as: