Examining Genetic Factors That Affect the Severity of 22q11.2 Deletion Syndrome

22q11.2 deletion syndrome is a disorder caused by the deletion of a small piece of chromosome
22. Most people with this disorder are missing a sequence of about 3 million DNA building
blocks on chromosome 22 within each cell. This disorder affects many areas of the body.
People with 22q11.2 deletion syndrome may have heart defects, immune deficiency, kidney
abnormalities, hearing loss, and cleft palate or other facial deformities. Many children
experience developmental delays and learning disabilities, and they have an increased risk of
developing mental illnesses, including schizophrenia, depression, anxiety, and bipolar
disorder. All people with 22q11.2 deletion syndrome are missing the same sequence of DNA, but
the severity of this disorder varies widely; some people are diagnosed with multiple health
and developmental problems, while others experience very few symptoms. In some people, the
symptoms may be so minimal that they are not even aware they have 22q11.2 deletion syndrome.
This study will examine genetic material—either from blood or saliva—among people with
22q11.2 deletion syndrome. Participants will attend one study visit and undergo either blood
or saliva collection. By analyzing the DNA sequences of participants, the study will aim to
identify any genetic variations that may affect the severity of 22q11.2 deletion syndrome.

Inclusion Criteria:

- Has 22q11 deletion of 3 megabases (Mb)

Exclusion Criteria:

- Has 22q11 deletion smaller than 3 Mb or no deletion