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22q11.2 duplication syndrome

Other Names for this Disease
  • 22q11.2 duplication
  • 22q11.2 microduplication syndrome
  • Chromosome 22q11.2 duplication syndrome
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22q11.2 duplication syndrome is a condition caused by an extra copy of a small piece of chromosome 22. The features of this condition vary widely, even among members of the same family. Affected individuals may have developmental delay, intellectual disability, slow growth leading to short stature, and weak muscle tone (hypotonia). Many people with the condition have no apparent physical or intellectual disabilities. It is inherited in an autosomal dominant manner, with about 70 percent of affected individuals inheriting the condition from a parent. In other cases it occurs as a de novo mutation (new genetic change) in an individual; however, individuals with a de novo mutation can can pass the duplication to their children.[1]
Last updated: 5/10/2011


  1. 22q11.2 duplication. Genetics Home Reference. November 2009; Accessed 5/10/2011.
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Basic Information

  • Genetics Home Reference (GHR) contains information on 22q11.2 duplication syndrome. This website is maintained by the National Library of Medicine.

In Depth Information

  • The Online Mendelian Inheritance in Man (OMIM) is an catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
  • Orphanet is a European reference portal for information on rare diseases and orphan drugs.  Access to this database is free of charge.
  • PubMed is a searchable database of medical literature and lists journal articles that discuss 22q11.2 duplication syndrome. Click on the link to view a sample search on this topic.