Bare lymphocyte syndrome--combined immunodeficiency and neutrophil dysfunction

Area of Science:

• Immunology
• Genetics

Background:

• Recurrent infections in children can indicate primary immunodeficiency disorders.
• Bare Lymphocyte Syndrome (BLS) is a rare condition affecting the immune system's ability to recognize pathogens.

Observation:

• A 4-year-old girl presented with recurrent infections, immunoglobulin deficiency, and neutropenia.
• She exhibited normal T-lymphocyte counts but impaired responses to certain mitogens and antigens.
• Crucially, Human Leukocyte Antigen (HLA) class II antigens were not expressed on her cells.

Findings:

• The patient was diagnosed with bare lymphocyte syndrome (BLS) type II.
• This case uniquely demonstrates neutrophil dysfunction alongside BLS type II.
• Immunoglobulin deficiencies included serum and secretory IgA, and serum IgG3.

Implications:

• This finding expands the known clinical spectrum of bare lymphocyte syndrome.
• It suggests a potential link between BLS type II and neutrophil functional defects.
• Further research is needed to understand the mechanisms underlying this association.