Meyahealth
HomeGeneticsGeneSTXBP1 gene
Back to Gene
STXBP1 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

STXBP1 gene

The STXBP1 gene provides instructions for making a protein that regulates the release of neurotransmitters, which is critical for normal brain function.

Normal Function

The STXBP1 gene provides instructions for making syntaxin-binding protein 1. In nerve cells (neurons), this protein helps regulate the release of chemical messengers called neurotransmitters from compartments known as synaptic vesicles. The release of neurotransmitters relays signals between neurons and is critical for normal brain function. Syntaxin-binding protein 1 regulates the formation of a protein complex that allows vesicle fusion with the outer membrane of the neuron. It may also play a role in the positioning and growth of neurons during brain development.

Health Conditions Related to Genetic Changes

STXBP1 encephalopathy

More than 150 mutations in the STXBP1 gene have been found to cause STXBP1 encephalopathy, a condition characterized by abnormal brain function (encephalopathy) and intellectual disability. Most affected individuals also have recurrent seizures (epilepsy) that begin in infancy.

The gene mutations that cause this condition reduce the amount of functional syntaxin-binding protein 1. A shortage of this protein impairs the formation of the protein complex necessary for vesicle fusion and neurotransmitter release. A change in neurotransmitter levels can lead to uncontrolled activation (excitation) of neurons, causing seizures. Researchers also suspect that a shortage of this protein impairs neuron development in certain regions of the brain.

Other Names for This Gene

  • hUNC18
  • MUNC18-1
  • N-Sec1
  • neuronal SEC1
  • NSEC1
  • RBSEC1
  • unc-18A
  • UNC18
  • unc18-1

Genomic Location

The STXBP1 gene is found on chromosome 9.

Frequently Asked Questions

The prognosis varies significantly among individuals. While many people with STXBP1 encephalopathy experience intellectual disability and ongoing seizure activity, the severity ranges from mild to severe. Some individuals achieve independent mobility and speech, while others require substantial support for daily activities. Seizures may persist into adulthood, but some patients see a reduction in seizure frequency with age. Early and consistent management of seizures, along with developmental therapies such as physical, occupational, and speech therapy, can help maximize functional outcomes and quality of life.
Diagnosis usually begins with a clinical evaluation of seizure patterns and developmental history. An electroencephalogram (EEG) is performed to record brain electrical activity and identify specific seizure types. The definitive diagnosis is made through genetic testing, typically whole exome sequencing or targeted gene panels, which can identify pathogenic variants in the STXBP1 gene. Brain imaging, such as an MRI, may also be used to rule out other structural causes of seizures and to assess brain development, although structural abnormalities are not always present in STXBP1 encephalopathy.
Treatment for STXBP1-related seizures often requires a trial of different anti-seizure medications, as response can vary between individuals. Some studies suggest that certain medications, such as levetiracetam or valproate, may be effective, while others may be less so or even exacerbate symptoms. In some cases, a combination of medications is necessary to achieve seizure control. It is important to work closely with a pediatric neurologist who specializes in genetic epilepsies to tailor the treatment plan, as the goal is not only to stop seizures but also to minimize side effects that could interfere with development and daily functioning.
The most common early sign of STXBP1 encephalopathy is the onset of seizures, which typically begin in the first few months of life. These seizures can vary in type and severity, often including infantile spasms or focal seizures. Other early indicators may include developmental delays, such as difficulty achieving milestones like head control or sitting, and abnormal muscle tone, which can range from low tone (hypotonia) to high tone (hypertonia). Some infants may also exhibit feeding difficulties or irritability. Early recognition of these signs is crucial for prompt diagnosis and initiation of seizure management.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

Meyahealth

Ⓒ 2026. All rights reserved by MEYA

About UsTerms & PolicyFAQ