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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
- No subdivisions found.
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].)
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