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SLC9A6 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

SLC9A6 gene

The SLC9A6 gene is responsible for producing the NHE6 protein, which regulates acidity within cellular compartments known as endosomes.

Normal Function

The SLC9A6 gene provides instructions for making a protein called sodium/hydrogen exchanger 6 (NHE6). These proteins act as channels in cell membranes, allowing sodium ions into the cell or cellular compartment in exchange for hydrogen ions, which are removed. This process helps regulate the relative acidity (pH) of the cell.

The NHE6 protein is located in the membrane of endosomes, which are compartments responsible for recycling proteins and other cellular materials. By controlling the pH inside these endosomes, the protein supports proper recycling and may assist in protein trafficking—the movement of proteins to their correct locations within the cell.

Health Conditions Related to Genetic Changes

Christianson syndrome

Mutations in the SLC9A6 gene lead to Christianson syndrome, a condition characterized by neurological issues such as intellectual disabilities, seizures, and an inability to walk or speak.

  • Mechanism: Mutations typically result in an abnormally short, nonfunctional NHE6 protein that is broken down quickly by cells.
  • Impact: The absence of functional NHE6 prevents the proper maintenance of pH levels within endosomes. While the exact link between unregulated endosomal pH and neurological symptoms remains under study, research suggests that protein trafficking by endosomes is vital for learning and memory.

Genomic Location

The SLC9A6 gene is found on the X chromosome.

Frequently Asked Questions

Individuals with Christianson syndrome typically experience severe global developmental delays, profound intellectual disability, and an inability to walk or speak. Other common neurological symptoms include recurrent seizures, ataxia (problems with coordination and balance), and microcephaly (a smaller-than-average head size). They may also exhibit behavioral issues and have difficulty with feeding.
Christianson syndrome is a severe, progressive neurological disorder. The prognosis is generally poor, with individuals often having a significantly reduced life expectancy, usually into early adulthood. Quality of life is severely impacted by profound intellectual and physical disabilities, requiring lifelong comprehensive care and support.
Management is supportive and multidisciplinary, focusing on symptom management and maximizing quality of life. This includes anti-seizure medications to control epilepsy, physical therapy to improve motor skills, occupational therapy for daily living activities, and speech therapy for communication. Nutritional support, often including a feeding tube, may be necessary due to feeding difficulties.
Christianson syndrome primarily affects males because they have only one X chromosome. If a male inherits a mutated SLC9A6 gene on his X chromosome, he will develop the condition. Females have two X chromosomes, so if they inherit one mutated gene, the presence of a healthy gene on the other X chromosome usually prevents them from developing severe symptoms, making them carriers. However, some carrier females may experience milder symptoms or learning difficulties.
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.

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