PARP4 (Poly(ADP-Ribose) Polymerase 4), also known as vault PARP (vPARP) or ARTD4, encodes a member of the poly(ADP-ribose) polymerase family. While PARP1 and PARP2 are well-characterized for their roles in DNA damage response, PARP4 has distinct functions, particularly in association with vault particles—large ribonucleoprotein complexes involved in cellular transport and signaling. PARP4 is implicated in DNA repair, cellular stress responses, and has emerging roles in neurodegeneration[1].
| Property | Value |
|---|---|
| Gene Symbol | PARP4 |
| Protein | Poly(ADP-ribose) polymerase 4 (Vault PARP, vPARP) |
| Chromosomal Location | 13q12.12 |
| NCBI Gene ID | 8548 |
| UniProt ID | Q9UKK3 |
| Aliases | PARP4, ARTD4, vPARP |
PARP4 contains several distinct structural domains:
| Domain | Function |
|---|---|
| N-terminal region | Protein-protein interactions |
| WGR domain | Nucleic acid binding (tryptophan-glycine-arginine) |
| BRCT domain | DNA damage response (breast cancer C-terminal) |
| Catalytic domain | PAR synthesis activity |
PARP4 is unique among PARP family members in its association with vault particles:
Like other PARPs, PARP4 can catalyze poly(ADP-ribosyl)ation (PARylation):
However, PARP4's catalytic activity appears less robust than PARP1/PARP2 and may have specialized functions.
PARP4 participates in DNA repair pathways:
| Pathway | Role |
|---|---|
| Base excision repair (BER) | Assists in repair of small lesions |
| Single-strand break repair | Contributes to SSB detection |
| Double-strand break response | May participate in HR/NHEJ |
Vault particles are implicated in:
PARP4 responds to various cellular stresses:
PARP4 is increasingly recognized in AD pathogenesis[3]:
Mechanisms:
Evidence:
PARP involvement in PD relates to mitochondrial dysfunction[4]:
Mechanisms:
Evidence:
PARP4 contributes to post-ischemic injury:
PARP4 has been studied in cancer contexts:
While not a primary disease-causing gene, PARP4 may modify neurodegeneration:
Current PARP inhibitors primarily target PARP1/PARP2:
Given PARP-mediated NAD+ depletion:
PARP4 is expressed in:
| Cell Type | Expression | Function |
|---|---|---|
| Neurons | Moderate | DNA repair, stress response |
| Astrocytes | Moderate | Glial stress responses |
| Microglia | Low | Immune functions |
| Oligodendrocytes | Low | Myelin maintenance |
| Protein | Interaction Type | Pathway |
|---|---|---|
| Major Vault Protein (MVP) | Physical complex | Vault particle |
| PARP1 | Functional | DNA damage response |
| XRCC1 | Interaction | Base excision repair |
| DNA ligase III | Interaction | DNA repair |
Amé JC, et al. The PARP family and the DNA damage response. Semin Cell Dev Biol. 2019. ↩︎
Yelick J, et al. Vault particles: structure and function. J Struct Biol. 2017. ↩︎
Song M, et al. DNA damage and repair in Alzheimer's disease pathogenesis. Nat Rev Neurol. 2020. ↩︎
Jiang H, et al. Poly(ADP-ribosyl)ation in Parkinson's disease models. Cell Mol Neurobiol. 2016. ↩︎