Human inborn errors of immunity associated with IRF4.

Area of Science:

• Immunology
• Genetics
• Molecular Biology

Background:

• Interferon regulatory factor 4 (IRF4) is crucial for adaptive immune responses.
• Mutations in IRF family members (IRF1-3, 7-9) are linked to inborn errors of immunity (IEI), affecting host defense against infections.
• IRF4 deficiency/haploinsufficiency and novel disease mechanisms are associated with IEI, cellular immunodeficiency, and agammaglobulinemia.

Purpose of the Study:

• To review the phenotypes of IEI related to IRF family members.
• To elucidate the physiopathological mechanisms of IEI caused by IRF family members, focusing on IRF4.
• To highlight the role of IRF4 in immune function and disease.

Main Methods:

• Literature review of published studies on IRF family members and IEI.
• Analysis of patient data and genetic findings related to IRF4 mutations.
• Synthesis of information on clinical phenotypes and molecular mechanisms.

Main Results:

• Mutations in IRF1, IRF3, IRF7, IRF8, and IRF9 are implicated in IEI.
• IRF4 deficiency and haploinsufficiency are recognized causes of IEI.
• Novel IRF4-related disease mechanisms involving cellular immunodeficiency and agammaglobulinemia have been identified.

Conclusions:

• IRF family members, particularly IRF4, play a vital role in the immune system.
• Dysregulation of IRF4 function leads to diverse IEI phenotypes.
• Understanding IRF4's role is crucial for diagnosing and potentially treating IEI.