Epidemiology
22q11.2 deletion syndrome affects between 1 in 2000 and 1 in 4000 live births. This estimate is based on major birth defects and may be an underestimate, because some individuals with the deletion have few symptoms and may not have been formally diagnosed.
It is one of the most common causes of mental retardation due to a genetic deletion syndrome.
Read more about this topic: Di George Syndrome