STX12 (Syntaxin 12): A Key SNARE Protein in Endosomal Trafficking and Neurodevelopment
Comprehensive genomic, expression, and clinical insights into STX12, a t-SNARE implicated in vesicular transport, neurodevelopmental disorders, and cancer.
Gene Information Card
| Symbol | STX12 |
|---|---|
| Full Name | Syntaxin 12 |
| Gene Type | Protein coding |
| Chromosomal Location | 1p35.3 |
| NCBI Gene ID | 23673 ncbi.nlm.nih.gov/gene/23673 |
| Ensembl ID | ENSG00000117758 |
| UniProt ID | Q86Y82 |
| OMIM ID | 620364 |
| HGNC ID | 11430 |
| Aliases | STX13, Syntaxin-13, STX12B |
Description
STX12 encodes syntaxin 12, a member of the syntaxin family of t-SNARE proteins. It localizes to early endosomes and the trans-Golgi network, where it mediates vesicle docking and fusion, playing a critical role in endosomal recycling, autophagy, and synaptic vesicle recycling. STX12 is ubiquitously expressed with high levels in the brain and is essential for neuronal development and function.
Disease Associations
| Disease category | Pathophysiological mechanism | Genomic evidence |
|---|---|---|
| Neurodevelopmental disorder with intellectual disability and speech delay | Biallelic loss-of-function variants impair endosomal trafficking, disrupting synaptic function and neuronal connectivity. | ClinVar (Pathogenic variants reported) |
| Schizophrenia (susceptibility) | Altered STX12 expression may affect glutamatergic signaling and synaptic plasticity. | OMIM (association studies) |
| Cancer (various types) | Dysregulation of STX12 affects membrane trafficking, potentially influencing tumor invasion and metastasis. | COSMIC (somatic mutations in multiple cancers) |
Expression Profile
Tissue Expression
| Tissue | nTPM | level |
|---|---|---|
| Brain (cerebral cortex) | 18.2 | High |
| Testis | 12.5 | Medium |
| Lung | 8.3 | Medium |
| Liver | 5.1 | Low |
| Skeletal muscle | 3.4 | Low |
Cell Line Expression
| Cell Line | nTPM | Notes |
|---|---|---|
| SH-SY5Y (neuroblastoma) | 22.1 | High expression; used in neuronal studies |
| HeLa (cervical carcinoma) | 15.7 | Moderate; endosomal trafficking studies |
| HepG2 (hepatocellular carcinoma) | 7.8 | Low; minimal relevance |
| A549 (lung carcinoma) | 9.2 | Moderate; potential cancer link |
Data source：Human Protein Atlas（proteinatlas.org）
Mutations & Variants
Hotspot Mutations
| Variant | Type | Frequency | Functional Description |
|---|---|---|---|
| c.1A>G (p.Met1?) | Missense (start loss) | Rare | Loss of translation initiation; likely loss-of-function |
| c.IVS2+1G>A | Splice donor | Rare | Aberrant splicing; predicted loss-of-function |
| p.Arg240* | Nonsense | Rare | Premature truncation; loss-of-function |
| p.Glu120Lys | Missense | Somatic (COSMIC) | Unknown; may affect SNARE interaction |
Mutation functional classification
Loss of Function (LOF)
Biallelic loss-of-function variants (nonsense, frameshift, splice) cause neurodevelopmental disorder, likely due to haploinsufficiency or complete loss of STX12 function.
Gain of Function (GOF)
No evidence of gain-of-function mutations; somatic missense variants in cancer are not characterized as activating.
Dominant Negative (DN)
Not reported; no dominant-negative mechanism established.
View complete mutation data：
Gene Ontology (GO)
| • SNARE binding | • SNAP receptor activity |
| • Protein domain specific binding | • Vesicle fusion |
| • Intracellular protein transport | • Endosomal transport |
| • Autophagy | • Synaptic vesicle recycling |
Pathways
• Endosomal recycling pathway
• Autophagy pathway
• SNARE interactions in vesicular transport
• Synaptic vesicle cycle
Protein Summary
Syntaxin 12 is a 276-amino acid protein with a C-terminal transmembrane domain and a SNARE coiled-coil domain. It forms a complex with VAMP4 and SNAP-47 to mediate fusion of early endosomes and recycling vesicles. STX12 is critical for neurite outgrowth, synaptic plasticity, and autophagosome maturation. Its dysfunction is linked to neurodevelopmental disorders and cancer progression.
Related Services
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| STX12 Knockout HEK293 Cell Line | EDJ-KQ7449 | Human | 23673 | Details Get a Quote |
| STX12 Knockout A-549 Cell Line | EDJ-KQ34000 | Human | 23673 | Details Get a Quote |
| STX12 Knockout HCT 116 Cell Line | EDJ-KQ34002 | Human | 23673 | Details Get a Quote |
| STX12 Knockout HeLa Cell Line | EDJ-KQ34003 | Human | 23673 | Details Get a Quote |
