DiGeorge syndrome is caused by a 1.5-3 Mb hemizygous deletion of chromosome 22q11.2. Chromosome 22 has been found to possess a high number of low copy number repeats, which suggests responsibility for the instability of 22q11. In a majority of cases of DiGeorge Syndrome, the deletion is mediated by homologous recombination between these low copy number repeats [4] [5]. Within this deletion region is a key gene for early vertebrate development, TBX1. Haploinsufficiency of TBX1 is responsible for major phenotypes that are seen in individuals with DiGeorge syndrome. However, the variability of phenotypic features with a deletion of TBX1 suggests that altered interaction with downstream genes and environmental effects also affect the disease presentation. [6].As in all microdeletion syndromes, inheritance is autosomal dominant, however most cases of DiGeorge syndrome result from a de novo microdeletion [1].