Investigating Chromosomal Radiosensitivity in Inborn Errors of Immunity: Insights from DNA Repair Disorders and...

Area of Science:

• Immunology
• Genetics
• Radiation Biology

Background:

• Human inborn errors of immunity (IEI) are genetic disorders impacting immune function.
• Some IEI involve DNA repair defects, leading to immunodeficiency, bone marrow failure, and malignancy risk.
• Radiosensitivity (RS) is a potential complication, but its prevalence across diverse IEI is not well understood.

Purpose of the Study:

• To investigate chromosomal radiosensitivity (RS) in a cohort of 107 IEI patients.
• To assess the variability of RS across different IEI genetic and phenotypical subgroups.
• To determine the clinical significance of RS testing in IEI management.

Main Methods:

• Utilized the G0 cytokinesis-block micronucleus (MN) assay to measure chromosomal RS.
• Analyzed a cohort of 107 patients with various inborn errors of immunity.
• Correlated MN yields with genetic subtypes, clinical features, and age.

Main Results:

• Significant variability in RS was observed across IEI subgroups.
• Severe RS was detected in all ataxia-telangiectasia (AT) patients, and in FANCI and ERCC6L2 deficient patients.
• Age influenced spontaneous and radiation-induced MN yields; other clinical features did not correlate with increased MN levels.

Conclusions:

• RS assessment is clinically crucial for ataxia-telangiectasia (AT) patients.
• RS testing should be considered for IEI patients with suspected DNA repair disorders.
• Understanding RS in IEI aids in refining radiation therapy protocols and patient management.