TBX1 and 22q11.2 deletion syndrome: The SNP array results of case 1 (Table 3), the fetus had a 3.1 Mb deletion in the 22q11.21 region, which contained 49 OMIM genes, including CLTCL1, HIRA, and TBX1. Reportedly, the 22q11.2 deletion is associated with the 22q11.2 deletion syndrome.