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NLRP3 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

NLRP3 gene

The NLRP3 gene provides instructions for making the protein cryopyrin, which is essential for triggering the inflammatory process in the immune system.

Normal Function

The NLRP3 gene provides instructions for making a protein called cryopyrin, a member of the NOD-like receptor (NLR) protein family. Cryopyrin is found mainly in white blood cells and cartilage-forming cells (chondrocytes).

Cryopyrin helps the immune system recognize bacteria, chemicals (such as asbestos, silica, and uric acid crystals), and compounds released by injured cells. It assembles into structures called inflammasomes, which trigger inflammation. This process recruits white blood cells to sites of injury or disease to fight invaders and repair tissue. Once the threat is neutralized, the body inhibits the inflammatory response to prevent damage to healthy tissues.

Health Conditions Related to Genetic Changes

Cryopyrin-associated periodic syndromes (CAPS)

Variants in the NLRP3 gene cause cryopyrin-associated periodic syndromes (CAPS), a spectrum of conditions characterized by periodic episodes of fever, skin rash, and joint pain. The spectrum includes:

  • Familial cold autoinflammatory syndrome type 1 (FCAS1): The least severe form.
  • Muckle-Wells syndrome (MWS): Intermediate severity.
  • Neonatal-onset multisystem inflammatory disorder (NOMID): The most severe form.

These variants result in an overactive cryopyrin protein. Inflammasomes containing this abnormal protein trigger inflammatory responses even when there is no injury or disease, leading to widespread damage to the body's cells and tissues.

Genomic Location

The NLRP3 gene is found on chromosome 1.

Frequently Asked Questions

The mainstay of treatment is an interleukin‑1 (IL‑1) inhibitor, such as anakinra, canakinumab, or rilonacept. These drugs block the downstream cytokine produced by the overactive inflammasome, thereby reducing fever, rash, joint pain, and preventing long‑term organ damage. Treatment is usually lifelong and is tailored to disease severity.
NLRP3 mutations are inherited in an autosomal dominant pattern, meaning a single altered copy can cause disease. Each child of an affected parent has a 50 % chance of inheriting the mutation. Genetic counseling can clarify recurrence risk, discuss prenatal or pre‑implantation testing options, and provide information on surveillance for early disease manifestations.===
Patients with unexplained, daily or intermittent fevers that spike with cold exposure, accompanied by a salmon‑pink rash, arthralgia, and elevated acute‑phase reactants (CRP, ESR) should raise suspicion. A family history of similar episodes or a history of early‑onset sensorineural hearing loss also supports evaluation for a NLRP3 variant. A targeted genetic test for NLRP3 is the definitive diagnostic step.
Cold temperatures, stress, infections, and certain foods (e.g., high‑purine foods that raise uric acid) can precipitate flares. Patients are advised to keep warm, manage stress, maintain a balanced diet, and use prophylactic IL‑1 blockade during anticipated triggers (e.g., winter months). Regular monitoring of inflammatory markers helps gauge flare risk.
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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