TRIM20, also known as MEFV (Mediterranean Fever), encodes pyrin, an immunoregulatory protein that belongs to the TRIM family of E3 ubiquitin ligases. While primarily studied in autoimmune disease, particularly familial Mediterranean fever, pyrin has important implications for neuroinflammation in neurodegenerative conditions[1].
| Property | Value |
|---|---|
| Gene Symbol | TRIM20 |
| Gene Name | Tripartite Motif Containing 20 |
| Aliases | MEFV, Pyrin |
| Chromosomal Location | 16p13.3 |
| NCBI Gene ID | 4212 |
| OMIM ID | 249100 |
| UniProt ID | O15587 |
| Ensembl ID | ENSG00000103313 |
| Gene Type | Protein Coding |
Pyrin/MEFV contains several functional domains:
This tripartite motif structure is characteristic of the TRIM (Tripartite Motif) protein family, though pyrin is somewhat unusual in lacking a canonical RING finger domain[2].
Pyrin is primarily known for its role in inflammasome regulation:
Pyrin negatively regulates inflammatory responses:
Pyrin participates in programmed cell death pathways:
TRIM20 is expressed in various tissues:
In the brain:
Pyrin contributes to neuroinflammation in AD:
In PD pathogenesis:
Pyrin is activated in cerebral ischemia:
| Disease | Evidence Level | Mechanism |
|---|---|---|
| Familial Mediterranean Fever | Confirmed | Autoinflammatory mutations |
| Alzheimer's Disease | Moderate | Neuroinflammation |
| Parkinson's Disease | Moderate | Microglial activation |
| ALS | Moderate | Motor neuron inflammation |
| Stroke | Moderate | Ischemic injury response |
Pyrin interacts with several key proteins:
| Protein | Interaction Type | Functional Consequence |
|---|---|---|
| ASC | Inflammasome component | Assembly of inflammasome complex |
| Caspase-1 | Protease | Pro-caspase recruitment |
| PYCARD | Adaptor protein | Signal transduction |
| NLRP3 | Inflammasome | Complex formation and activation |
| Pro-IL-1beta | Substrate | Processing to active form |
| Pro-IL-18 | Substrate | Processing to active form |
TRIM20 represents a significant therapeutic target:
Masters SL et al. Regulation of inflammatory diseases by pyrin. 2009. ↩︎
Chae JJ et al. The familial Mediterranean fever protein, pyrin, is cleaved by caspase-1 and activates NF-kappaB through its N-terminal fragment. 2011. ↩︎