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KCNJ11 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

KCNJ11 gene

The KCNJ11 gene provides instructions for creating potassium channels in pancreatic beta cells that regulate insulin secretion, with mutations linked to conditions like congenital hyperinsulinism and permanent neonatal diabetes mellitus.

Normal Function

The KCNJ11 gene provides instructions for making one subunit of the ATP-sensitive potassium (KATP) channels found in pancreatic beta cells. These channels consist of eight subunits: four produced from the KCNJ11 gene and four from the ABCC8 gene.

These channels span the cell membranes of beta cells, which secrete insulin to control blood glucose levels. When blood glucose is high, the KATP channels close, triggering the release of insulin. By regulating this process, the channels help maintain healthy blood sugar levels.

Health Conditions Related to Genetic Changes

Congenital hyperinsulinism

Variants in the KCNJ11 gene can cause congenital hyperinsulinism, where beta cells release too much insulin, causing frequent low blood glucose levels. This can lead to decreased energy, irritability, and, if untreated, serious complications like seizures and intellectual disabilities.

Permanent neonatal diabetes mellitus

Variants in the KCNJ11 gene cause permanent neonatal diabetes mellitus, a form of diabetes appearing within the first six months of life. Some individuals also experience neurologic problems, including developmental delays, epilepsy, and ADHD; this combination is known as DEND syndrome. These variants cause the KATP channels to remain open, reducing insulin secretion and leading to high blood glucose levels.

Other disorders

Transient neonatal diabetes mellitus is caused by variants that have a milder effect on KATP channel function than those causing permanent diabetes. Infants experience high blood glucose in the first six months, which typically resolves by age 18 months, though it may return during adolescence or early adulthood.

Other Names for This Gene

  • ATP-sensitive inward rectifier potassium channel 11
  • beta-cell inward rectifier
  • beta-cell inward rectifier subunit
  • BIR
  • inward rectifier K(+) channel Kir6.2
  • inwardly rectifying potassium channel KIR6.2
  • Kir6.2
  • potassium channel, inwardly rectifying subfamily J, member 11
  • potassium channel, inwardly rectifying, BIR subunit

Genomic Location

The KCNJ11 gene is found on chromosome 11.

Frequently Asked Questions

Yes. Many infants with KCNJ11 mutations respond well to sulfonylurea drugs (e.g., glibenclamide), which close the KATP channels and stimulate insulin release. A gradual dose titration under a pediatric endocrinologist’s guidance can often replace insulin therapy.
Hyperinsulinism can persist from infancy into childhood. If a child has unexplained hypoglycemia episodes (e.g., sweating, irritability, seizures) that do not resolve with feeding, immediate medical evaluation is needed to prevent brain injury.
Children may experience developmental delays, speech difficulties, or seizures. Early intervention services, regular developmental assessments, and neurologic monitoring are important to address these issues promptly.
Yes. KCNJ11 mutations are inherited in an autosomal dominant pattern. Genetic counseling can estimate recurrence risk and discuss options such as prenatal testing or pre‑implantation genetic diagnosis for future pregnancies.===
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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