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Diseases

Genetic and Rare Diseases Information Center (GARD)

Chromosome 21q deletion


Other Names for this Disease
  • Deletion 21q
  • Monosomy 21q
  • 21q deletion
  • 21q monosomy
  • Partial monosomy 21q
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Overview

Chromosome 21q deletion is a chromosome abnormality that occurs when there is a missing copy of the genetic material located on the long arm (q) of chromosome 21. The severity of the condition and the signs and symptoms depend on the size and location of the deletion and which genes are involved. Features that often occur in people with chromosome 21q deletion include developmental delay, intellectual disability, behavioral problems, and distinctive facial features.[1][2] Most cases are not inherited, but people can pass the deletion on to their children. Treatment is based on the signs and symptoms present in each person.
Last updated: 12/16/2015

References

  1. Monosomy 21. Orphanet. January 2012; http://www.orpha.net/consor/cgi-bin/OC_Exp.php?lng=en&Expert=574.
  2. 21q Deletions. Unique. 2005; http://www.rarechromo.org/information/Chromosome%2021/21q%20deletions%20FTNW.pdf.
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Basic Information

  • Genetics Home Reference (GHR) contains information on Chromosome 21q deletion. This website is maintained by the National Library of Medicine.
  • Unique is a source of information and support to families and individuals affected by rare chromosome disorders. Click on the link to view information about 21q deletions.

In Depth Information

  • 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 Chromosome 21q deletion. Click on the link to view a sample search on this topic.
Other Names for this Disease
  • Deletion 21q
  • Monosomy 21q
  • 21q deletion
  • 21q monosomy
  • Partial monosomy 21q
See Disclaimer regarding information on this site. Some links on this page may take you to organizations outside of the National Institutes of Health.