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KCNK9 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

KCNK9 gene

The KCNK9 gene is essential for normal brain development and function, and mutations in the maternally inherited copy can lead to KCNK9 imprinting syndrome.

Normal Function

The KCNK9 gene provides instructions for making a protein called TASK3, which functions as a potassium channel. These channels are "always open" (leak channels) and are particularly abundant in neurons within the brain, especially the cerebellum.

TASK3 channels help maintain the cell's ability to generate electrical signals and regulate neuronal excitability. They also play a role in the migration of certain neurons during brain development.

KCNK9 is a maternally expressed imprinted gene. This means that only the copy inherited from the mother is active, while the copy inherited from the father is silenced.

Health Conditions Related to Genetic Changes

KCNK9 imprinting syndrome

This condition occurs when a mutation affects the active (maternally inherited) copy of the KCNK9 gene. The most common mutation (Gly236Arg) reduces the flow of ions through TASK3 channels by 80 percent. Symptoms include:

  • Weak muscle tone (hypotonia) from birth, which may affect feeding.
  • Intellectual disability.
  • Delayed development of speech and motor skills.

The reduction in ion transport disrupts normal neuron development and the ability of neurons to generate electrical signals, which underlies the condition's symptoms.

Genomic Location

The KCNK9 gene is found on chromosome 8.

Frequently Asked Questions

Parents might first notice weak muscle tone (hypotonia) from birth, which can lead to difficulties with feeding. Other early signs include significant delays in reaching developmental milestones, such as learning to speak or walk, and overall intellectual disability as the child grows.
Because only the copy of the KCNK9 gene inherited from the mother is active, a mutation in her active copy causes the syndrome. If a mother carries the mutation, there is a 50% chance with each pregnancy that her child will inherit the affected gene and develop the syndrome. Genetic counseling is highly recommended to understand recurrence risks and discuss reproductive options.
Management focuses on supportive therapies to address developmental delays and symptoms. This often includes physical therapy to improve muscle tone and motor skills, occupational therapy for daily living activities, and speech therapy to aid communication development. Early intervention programs and special education support are also crucial for intellectual development.
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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