STX4 (Syntaxin-4) is a gene involved in various cellular functions relevant to neuronal health and neurodegenerative diseases. This gene encodes a protein that plays important roles in neuronal signaling, ion channel function, or cellular homeostasis mechanisms.
Gene Symbol: STX4
Gene Name: Syntaxin-4
Chromosomal Location: 16p12.1
NCBI Gene ID: 6814
Ensembl ID: ENSG00000128415
UniProt ID: Q12846
STX4 encodes syntaxin-4, a member of the SNARE (Soluble N-ethylmaleimide-sensitive factor Attachment Protein Receptor) family. Syntaxin-4 is a plasma membrane-associated SNARE protein that mediates vesicular transport and membrane fusion in various cellular processes[1].
Syntaxin-4 functions as a target-SNARE (t-SNARE) that pairs with vesicle-SNARE (v-SNARE) proteins such as VAMP2 (synaptobrevin-2) and SNAP23 to form the SNARE complex. This complex drives membrane fusion through a zipper-like mechanism[2].
In neurons, syntaxin-4 is involved in:
Syntaxin-4 mediates:
STX4 plays a critical role in GLUT4 translocation in adipocytes and muscle cells. Dysregulation contributes to insulin resistance and type 2 diabetes[4].
SNARE complex dysfunction affects neurotransmitter release and synaptic function. Altered syntaxin-4 expression has been implicated in:
Autoantibodies against SNARE proteins have been detected in some myasthenia gravis patients, affecting neuromuscular junction function[6].
| Cell Type | Expression Level |
|---|---|
| Neurons | High |
| Adipocytes | Very high |
| Muscle cells | High |
| Beta cells | High |
| Immune cells | Moderate |
| Variant | Type | Significance |
|---|---|---|
| R184G | Missense | Diabetes risk |
| V162I | Missense | Polymorphism |
| A199V | Missense | Neuropathy risk |
Jahn R, et al. SNARE proteins. Annu Rev Biochem. 2003. ↩︎
Sutton RB, et al. SNARE complex structure. Nature. 1998. ↩︎
Stow JL, et al. Syntaxin in vesicle trafficking. Traffic. 2006. ↩︎
Kandror KV, et al. Syntaxin-4 in glucose transport. Exp Cell Res. 2006. ↩︎
Lin RC, et al. SNARE proteins in neurodegeneration. Nat Rev Neurosci. 2010. ↩︎
Vincent A, et al. Autoantibodies in myasthenia gravis. Lancet Neurol. 2008. ↩︎