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NKX2-1 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

NKX2-1 gene

The NKX2-1 gene provides instructions for making a protein essential for the development and function of the brain, lungs, and thyroid gland.

Normal Function

The NKX2-1 gene provides instructions for making a protein called homeobox protein Nkx-2.1, which is a member of the homeobox protein family. Homeobox proteins direct the formation of body structures during early embryonic development. This protein is particularly involved in the development and function of the brain, lungs, and thyroid gland.

Homeobox protein Nkx-2.1 functions as a transcription factor, meaning it attaches to DNA and controls the activity of other genes:

  • Brain: It regulates genes involved in the development and migration of specialized nerve cells called interneurons, which relay signals between other neurons.
  • Lungs: It controls the development of lung structures and regulates the expression of surfactant genes. These genes produce surfactant proteins that, combined with fats, line the lung tissue to facilitate breathing.
  • Thyroid Gland: It controls genes critical for the production of thyroid hormones, which regulate various body functions including growth and brain development.

Health Conditions Related to Genetic Changes

Brain-lung-thyroid syndrome

At least 100 mutations in the NKX2-1 gene have been linked to brain-lung-thyroid syndrome. This condition affects the brain, lungs, and thyroid, with affected individuals experiencing problems in one, two, or all three of these organs.

Common features include:

  • Benign hereditary chorea: Involuntary jerking movements of the face, torso, and limbs.
  • Respiratory distress syndrome: Severe breathing difficulty.
  • Hypothyroidism: Reduced thyroid gland function.

Mutations often result in an abnormally short or non-functional protein, or the deletion of the entire gene. A shortage of functional homeobox protein Nkx-2.1 impairs the development and function of the affected organs, leading to the symptoms described above.

Genomic Location

The NKX2-1 gene is found on chromosome 14.

Frequently Asked Questions

In the first weeks of life, look for persistent breathing difficulties such as rapid or labored breathing, cyanosis, or the need for supplemental oxygen. Neurologically, infants may display abnormal movements like chorea or seizures, and they may have feeding difficulties or poor weight gain. Thyroid involvement can present as a low heart rate, cold intolerance, or delayed developmental milestones. Early detection often requires a combination of clinical observation and laboratory testing.
NKX2‑1 mutations are inherited in an autosomal dominant pattern, so each child has a 50 % chance of inheriting the mutation. Prenatal options include chorionic villus sampling (CVS) at 10–12 weeks or amniocentesis at 15–20 weeks, both of which can test for the specific mutation. Pre‑implantation genetic diagnosis (PGD) during in‑vitro fertilization is another option for families wishing to avoid the mutation entirely.
The diagnosis usually starts with a clinical evaluation followed by a thyroid function panel, pulmonary function tests, and a brain MRI if neurological symptoms are present. Genetic confirmation is obtained through targeted sequencing of the NKX2‑1 gene or a broader panel for congenital hypothyroidism and respiratory disorders. Whole‑exome sequencing may be considered if the mutation is not found in standard panels.
Respiratory care may involve surfactant replacement, bronchodilators, or mechanical ventilation in severe cases. Neurological symptoms are managed with antiepileptic drugs for seizures and dopamine agonists or anticholinergic agents for chorea. Thyroid dysfunction is treated with levothyroxine replacement, with dosage adjusted based on regular TSH monitoring. Multidisciplinary care, including pulmonology, neurology, endocrinology, and genetics, is essential for optimal outcomes.
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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