Research on molecular mechanisms of break in immunological tolerance in disorders caused by single-gene defect

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We set up a multiparameter flow cytometry for detailed immunophenotyping and KRECs/TRECs analysis for assessment of B and T cell neogenesis, respectively in order to delve into pathogenesis of autoimmunity developed in primary immunodeficiency (PID). We categorized the PID patients into several groups and also established a database for PID with autoimmunity. We developed an extensive method to analyze IgH and TCR repertoires using high-throughput next generation sequencing (NGS), and started measuring the repertoire in 10 patients. Through whole exome analysis (WEA) for more than 40 PID patients with autoimmunity, we identified a mutation in 5 patients. These include BTK, FANCA, LRBA, PIK3CD, and STAT1. Candidate genes (ranging one to six) were obtained by carrying out WEA for a patient and his/her family members in 5 patients.