Inborn errors of immunity affecting the MHC class I pathway for antigen presentation

Area of Science:

• Immunology
• Genetics
• Dermatology

Background:

• Inborn errors of immunity affecting the Major Histocompatibility Complex (MHC) class I antigen presentation pathway are rare but severe.
• These conditions present with chronic infections, granulomatous skin lesions, and potential misdiagnosis as autoimmune diseases.

Purpose of the Study:

• To review the clinical manifestations and diagnostic challenges of MHC class I pathway defects.
• To present novel long-term follow-up data on Transporter Associated with Antigen Processing (TAP)-deficient patients.
• To highlight the variability in clinical presentation and the importance of individualized treatment.

Main Methods:

• Review of existing literature on MHC class I pathway defects.
• Analysis of long-term follow-up data from TAP-deficient patients.
• Case study analysis of individuals with MHC class I deficiency.

Main Results:

• MHC class I pathway defects lead to chronic respiratory infections and granulomatous skin lesions.
• Long-term follow-up indicates an increased risk of skin cancer and severe herpesvirus infections in TAP-deficient patients.
• Clinical presentation varies significantly, with some individuals remaining asymptomatic.

Conclusions:

• Accurate diagnosis and infection-focused treatment are crucial, avoiding immunosuppression.
• Further genetic and immunopathological research is needed to identify predictive markers.
• Long-term patient surveillance is essential for managing late-onset complications and optimizing care.