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DiGeorge syndrome (DGS) is the result of a microdeletion in chromosome 22q11.2 in over 90% of cases. DGS is the second most frequent syndrome after Down syndrome and has an incidence of 1/4000 births. Unequal crossover between low-copy repeats, on the proximal part of the long arm of chromosome 22, usually results in a 3 Mb deletion in one of the chromosome 22 and a reciprocal and similarly sized duplication on the other one. Several studies have indicated that TBX1 (T-box 1) haploinsufficiency is responsible for many of the phenotypic traits of 22q11.2 deletion syndrome. Conotruncal heart defects (CTDs) are present in 75-85% of patients with 22q11.2 deletion syndrome in Western countries.

Investigation ofTBX1gene deletion in Iranian children with 22q11.2 deletion syndrome: correlation with conotruncal heart defects: Table 1