STX1A (syntaxin 1A) is a Qa-SNARE protein that plays essential roles in calcium-dependent exocytosis and membrane fusion processes across multiple cellular contexts. The protein functions as part of the canonical SNARE complex, pairing with SNAP25 and VAMP2 to mediate synaptic vesicle fusion with the presynaptic plasma membrane for neurotransmitter release 1. Beyond synaptic function, STX1A exhibits dual subcellular localization, residing primarily in lysosomes while also localizing to the plasma membrane, where it regulates lysosomal exocytosis through SNARE complex formation with SNAP23/SNAP25 and VAMP2 2. Recent studies have identified a novel mitochondrial localization for STX1A in gastric cancer cells, where it modulates mitochondrial respiration and ferroptosis, contributing to chemoresistance mechanisms 3. Clinically, STX1A variants are associated with neurodevelopmental disorders, as mutations in the synaptic SNARE complex components, including STX1A, can produce phenotypes involving autism, intellectual disability, movement disorders, and epilepsy 1. The gene is also implicated in Williams syndrome, a microdeletion disorder affecting chromosome 7.23 that includes STX1A among the deleted genes, contributing to the syndrome's complex phenotype 4. Additionally, STX1A has been identified as a candidate gene in ADHD pathogenesis and consanguineous families with neurodevelopmental disorders 56.