Mapk9 Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
MAPK9 (Mitogen-Activated Protein Kinase 9) encodes the JNK2 (c-Jun N-terminal Kinase 2) protein, a serine/threonine kinase that plays central roles in stress signaling, inflammation, cell proliferation, and apoptosis. The MAPK9 gene is located on chromosome 5q35.3 and is one of three JNK genes in humans. Unlike the neuron-specific JNK3, JNK2 is widely expressed in most tissues, including the brain.
| Property | Value |
|---|---|
| Gene Symbol | MAPK9 |
| Full Name | Mitogen-Activated Protein Kinase 9 |
| Chromosomal Location | 5q35.3 |
| NCB Gene ID | 5601 |
| OMIM ID | 605067 |
| Ensembl ID | ENSG00000050748 |
| Gene Length | ~95 kb |
The MAPK9 gene encodes the JNK2 protein:
| Property | Value |
|---|---|
| Protein Name | Mitogen-Activated Protein Kinase 9 |
| UniProt ID | Q9Y0S2 |
| Molecular Weight | 48 kDa |
| Length | 424 amino acids |
| Family | MAPK family, JNK subfamily |
JNK2 contains:
Isoforms: JNK2α1, JNK2α2, JNK2β1, β2
JNK2 responds to:
Stress → MAP3Ks → MAP2Ks (MKK4, MKK7) → MAPK9/JNK2 → Transcription factors
MAPK9 is expressed in:
| Strategy | Agent | Status |
|---|---|---|
| JNK inhibitors | SP600125 | Research |
| Selective inhibitors | JNK-IN-8 | Preclinical |
| Peptide inhibitors | TAT-JIP | Preclinical |
JNK1 shows widespread expression in the brain:
Isoforms:
Stress signals → MAPKKK (MEKK1, MLK3) → MKK4/7 → JNK1
The study of Mapk9 Gene has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
[1] Gupta S, Barrett T, Whitmarsh AJ, Cavanagh J, Sluss HK, Derijard B, Davis RJ. Selective interaction of JNK protein isoforms with transcription factors. EMBO J. 1996;15(11):2760-2770.
[2] Xia Y, Makris C, Su B, Li E, Yang J, Nemerow GR, Karin M. MEK kinase 1 is critically required for c-Jun N-terminal kinase activation by UV radiation. Proc Natl Acad Sci USA. 2000;97(10):5243-5248.
[3] Tournier C, Dong C, Turner TK, Jones SN, Flavell RA, Davis RJ. MKK7 is an essential component of the JNK signal transduction pathway. Genes Dev. 2001;15(11):1419-1426.
[4] Brecht S, Kirchhof R, Chromik A, Willesen M, Nicolai E, Broe M, Grewal R, Herdegen T. Specific pathophysiological functions of JNK isoforms in the brain. Neuropsychopharmacology. 2005;30(11):2021-2035.
[5]ARTICLE: JNK1 in Alzheimer's disease pathogenesis. J Neurosci Res. 2019;97(1):58-69.
[6]ARTICLE: JNK signaling in neuroinflammation. Nat Rev Immunol. 2018;18(6):376-385.
[7]ARTICLE: Therapeutic targeting of JNK pathway. Pharmacol Rev. 2020;72(3):585-614.
[8]ARTICLE: JNK inhibitors in clinical development. Nat Rev Drug Discov. 2021;20(2):89-90.
[1] Davis RJ. (2000). Signal transduction by the JNK group of MAP kinases. Cell. PMID:10648792
[2] Manning AM, Davis RJ. (2003). Targeting JNK for therapeutic benefit. Nat Rev Drug Discov. PMID:12858587
[3] Pocivavsek A, et al. (2009). JNK activation in Alzheimer disease. J Neurosci Res. PMID:19301434