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Trisomy X

Abstract

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NORD is very grateful to Carole Samango-Sprouse, EdD, Executive Director and Chief Science Officer, The Focus Foundation, for assistance in the preparation of this report.

Synonyms of Trisomy X

  • 47, XXX
  • 47, XXX karyotype
  • 47, XXX syndrome
  • triple X syndrome
  • triplo X
  • XXX syndrome

Disorder Subdivisions

  • No subdivisions found.

General Discussion

Trisomy X is a disorder that affects females and is characterized by the presence of an additional X chromosome. Normally, females have two X chromosomes; however, females with trisomy X carry three X chromosomes in the nuclei of body cells. There are specific physical features (phenotype) associated with this chromosomal disorder. Common symptoms that can potentially occur include language-based learning disabilities, developmental dyspraxia, tall stature, low muscle tone (hypotonia), and abnormal bending or curving of the pinkies toward the ring fingers (clinodactyly). Trisomy X occurs randomly as a result from errors during the division of reproductive cells in one of the parents. This disorder occurs in one in 900 to 1,000 live births.

Organizations related to Trisomy X

(Please note that some of these organizations may provide information concerning certain conditions potentially associated with this disorder [e.g., learning disabilities].)

The information in NORD’s Rare Disease Database is for educational purposes only. It should never be used for diagnostic or treatment purposes. If you have questions regarding a medical condition, always seek the advice of your physician or other qualified health professional. NORD’s reports provide a brief overview of rare diseases. For more specific information, we encourage you to contact your personal physician or the agencies listed as “Resources” on this report.

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