Difference of clinical phenotypes and immunological features of 22q11.2 deletion syndrome in north-eastern Thai children compare to western countries.

Background: 22q11.2 deletion syndrome is a common microdeletion syndrome that affected various systems.

Objective: To determine clinical phenotypes and immunologicalfeatures of 22q11.2 deletion syndrome in north-eastern Thai children compare to western countries.

Material And Method: The authors described the clinical and immunological features in 20 north-eastern Thai children with 22q11.2 deletion syndrome that were followed-up at Srinagarind Hospital.

Result: Clinical phenotypes were facial dysmorphism (100%), congenital heart disease (80%) and cleft palate (30%). Prevalence of tetralogy of Fallot (TOF) in this syndrome was higher than in western. Serious infections were found including pneumonia, septicemia and brain abscess. Only a patient had panhypogammaglobulinemia and subsequently died. Selective IgA deficiency was not found. There was a twin patient conceivedfrom intracytoplasmic sperm injection (ICSI).

Conclusion: TOF is more common in Asian patients than in western which different to selective IgA deficiency. The 22q11.2 deletion syndrome could be consequence from ICSI.