Leukocyte adhesion deficiency type 1 presenting as leukemoid reaction

Area of Science:

• Immunology
• Hematology
• Genetics

Background:

• Leukocyte Adhesion Deficiency (LAD) encompasses several rare genetic disorders affecting leukocyte function.
• LAD is characterized by impaired leukocyte emigration to inflammatory sites, leading to recurrent infections and poor wound healing.
• LAD type I (LAD-I) specifically involves defects in beta-2 integrins (CD11/CD18), crucial for leukocyte adhesion and migration.

Observation:

• A male neonate presented with persistent leukemoid reaction despite antibiotic treatment for omphalitis.
• The clinical presentation suggested a primary immune defect rather than a typical infection response.
• Flow cytometry analysis revealed a deficiency of beta-2 integrins on the patient's leukocytes.

Findings:

• The neonate was diagnosed with Leukocyte Adhesion Deficiency type I (LAD-I).
• The diagnosis was confirmed by the absence of essential beta-2 integrins on leukocyte surfaces.
• This deficiency explained the impaired leukocyte function and susceptibility to infections.

Implications:

• Early diagnosis of LAD-I is critical for initiating timely management and preventing severe complications.
• Understanding the molecular basis of LAD-I aids in developing targeted diagnostic and therapeutic strategies.
• This case underscores the importance of considering primary immunodeficiencies in neonates with recurrent infections and atypical presentations.