Immune deficiency in CHARGE association

Area of Science:

• Genetics and Immunology
• Pediatric Medicine

Background:

• CHARGE association is a rare, sporadic condition characterized by multiple congenital anomalies, including Coloboma, Heart defects, choanal Atresia, Retardation of growth/development, Genitourinary anomalies, Ear anomalies, and deafness.
• The molecular basis and full spectrum of CHARGE association remain incompletely understood, with potential overlaps with other genetic syndromes like DiGeorge sequence.
• While not a defining feature, immune system involvement in CHARGE association has been an area of limited investigation.

Observation:

• This study investigated three patients diagnosed with CHARGE association who presented with recurrent upper and lower respiratory tract infections.
• Clinical observations revealed distinct immune system abnormalities in each patient, suggesting heterogeneity in immune compromise within the CHARGE association spectrum.

Findings:

• One patient exhibited impaired T-cell proliferation and a diminished antibody response to polysaccharide antigens.
• Another patient was diagnosed with T-cell lymphopenia.
• The third patient presented with a mild IgG2 subclass deficiency.

Implications:

• The findings suggest that immune deficiency should be considered an occasional, albeit variable, component of CHARGE association.
• Early identification and management of immune defects, such as prophylactic antibiotics, may be beneficial for patients with CHARGE association experiencing frequent infections.
• Further research is warranted to elucidate the precise mechanisms and prevalence of immune dysfunction in CHARGE association.