Mendelian susceptibility to mycobacterial diseases due to complete IL12RB1 deficiency

Mendelian susceptibility to mycobacterial diseases due to complete IL12RB1 deficiency (also called complete interleukin-12 receptor beta-1 deficiency) is a rare inherited immune system disorder. People with this condition have a weakened ability to fight off certain types of infections, particularly those caused by mycobacteria. Mycobacteria include the germs that cause tuberculosis (TB) and a group of usually harmless environmental bacteria called nontuberculous mycobacteria (NTM). In healthy people, these environmental mycobacteria rarely cause illness, but in individuals with this deficiency, they can cause serious, widespread infections. The condition is also associated with increased vulnerability to Salmonella bacteria and certain fungal infections like candidiasis. The IL12RB1 gene provides instructions for making a protein that is part of the receptor for two important immune signaling molecules: interleukin-12 (IL-12) and interleukin-23 (IL-23). When this receptor is completely absent, immune cells — especially T cells and natural killer cells — cannot properly produce interferon-gamma, a critical molecule needed to activate macrophages that kill mycobacteria and other intracellular germs. This leaves the body unable to mount an effective defense against these specific infections. Symptoms typically begin in early childhood, often after BCG vaccination (a live vaccine against tuberculosis given in many countries) or after exposure to environmental mycobacteria. Infections can affect the lymph nodes, lungs, bones, skin, and sometimes spread throughout the body. Treatment focuses on aggressive and prolonged antibiotic therapy for infections, and in some cases, supplemental interferon-gamma therapy. Hematopoietic stem cell transplantation (bone marrow transplant) may be considered in severe cases as a potentially curative option.

Bring these to your next appointment

• Q1.How severe is my child's immune deficiency, and what infections should we watch for most closely?,Should my child receive interferon-gamma therapy, and what are the benefits and risks?,Is bone marrow transplant recommended for my child, and what would that process involve?,Which vaccines are safe and which should be avoided?,What preventive antibiotics should my child take, and for how long?,How should we handle fevers or signs of infection — when should we go to the emergency room?,Should other family members be tested for this genetic condition?

Common questions about Mendelian susceptibility to mycobacterial diseases due to complete IL12RB1 deficiency

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