Human MALT1 deficiency and predisposition to infections

Area of Science:

• Immunology
• Genetics
• Infectious Diseases

Background:

• Human germline MALT1 deficiency is a rare inborn error of immunity.
• It presents with recurrent bacterial, viral, and fungal infections, periodontal disease, enteropathy, dermatitis, and failure to thrive.
• Recent increases in identified MALT1-deficient patients have enhanced understanding of its clinical spectrum.

Purpose of the Study:

• To summarize the current understanding of clinical features in MALT1 deficiency.
• To highlight common infections and associated pathogens.
• To explore the immunological basis for enhanced susceptibility to certain pathogens.

Main Methods:

• Review of clinical data from identified MALT1-deficient patients.
• Analysis of infection patterns and causative agents.
• Correlation of clinical findings with immunological pathways, specifically Th17 immunity.

Main Results:

• Increased identification of MALT1-deficient patients has refined the understanding of clinical manifestations.
• Commonly affected systems include respiratory, skin, gastrointestinal, and blood.
• Frequent pathogens identified are Staphylococcus aureus, Candida albicans, and cytomegalovirus.

Conclusions:

• MALT1 deficiency leads to significant immune compromise, increasing susceptibility to a range of infections.
• Impaired Th17 immunity is implicated in the heightened susceptibility to S. aureus and C. albicans.
• Findings align with deficiencies in STAT3 and IL-17 pathways, suggesting overlapping immunological defects.