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IRAK4 gene

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

IRAK4 gene

The IRAK4 gene provides instructions for making a protein critical to the body's innate immune response against pathogens.

Normal Function

The IRAK4 gene provides instructions for making a protein that plays an important role in innate immunity, the body's early, nonspecific response to foreign invaders (pathogens). The IRAK-4 protein is part of a signaling pathway involved in the early recognition of pathogens and the initiation of inflammation to fight infection.

The IRAK-4 protein relays signals from Toll-like receptors and IL-1 receptor-related proteins. Toll-like receptors recognize patterns common to many pathogens to stimulate a quick immune response. The IL-1 receptor and related proteins recognize cytokines, which signal the need for an immune response. The resulting signaling pathway triggers inflammation to help fight infection.

Health Conditions Related to Genetic Changes

IRAK-4 deficiency

At least 20 mutations in the IRAK4 gene have been identified in people with IRAK-4 deficiency, an immune system disorder that leads to recurrent invasive bacterial infections. These mutations lead to an abnormally short, nonfunctional IRAK-4 protein or no protein at all.

The loss of functional IRAK-4 protein blocks the initiation of inflammation in response to pathogens or cytokines. Because the early immune response is insufficient, bacterial infections occur often and become severe and invasive.

Other Names for This Gene

  • interleukin-1 receptor-associated kinase 4
  • IPD1
  • IRAK-4
  • IRAK4_HUMAN
  • NY-REN-64
  • REN64

Frequently Asked Questions

IRAK4 deficiency primarily impairs the body’s early response to encapsulated bacteria such as Streptococcus pneumoniae, Staphylococcus aureus, and Haemophilus influenzae. Children are especially prone to severe pneumonia, meningitis, cellulitis, and sepsis caused by these organisms. Prompt medical evaluation for fever, respiratory symptoms, or skin lesions is critical, and early antibiotic treatment can be lifesaving.
Yes, immunizations are essential, but live‑attenuated vaccines (e.g., oral polio, rotavirus, BCG) should be avoided or used only after careful risk‑benefit discussion with an immunologist. Inactivated vaccines, especially conjugate vaccines against pneumococcus, Haemophilus influenzae type b, and meningococcus, are strongly recommended and may be given on an accelerated schedule. Some clinicians also give prophylactic antibiotics after certain vaccinations to cover the window before full immunity develops.
Long‑term strategies include: (1) regular prophylactic antibiotics (often a daily penicillin or macrolide) especially during the first few years of life; (2) prompt treatment of any febrile illness with broad‑spectrum antibiotics pending cultures; (3) routine immunizations as described above; (4) education of caregivers and school personnel about the child’s condition and the need for immediate medical attention if infection is suspected; and (5) periodic evaluation by an immunology specialist to adjust therapy based on infection history.
Before travel, obtain a detailed travel‑medicine consultation. Ensure all routine and recommended vaccines are up‑to‑date, obtain any additional vaccines required for the destination (e.g., meningococcal vaccine for certain regions), and carry a written emergency plan that includes the child’s diagnosis, current antibiotic prophylaxis, and a supply of broad‑spectrum antibiotics for immediate use. Also, avoid high‑risk exposures such as unpasteurized dairy or close contact with individuals known to have bacterial infections.
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.