Triple X syndrome
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| Triple X syndrome Classification and external resources | |
| ICD-10 | Q97.0 |
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| DiseasesDB | 13386 |
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Triple X syndrome is a form of chromosomal variation characterized by the presence of an extra X chromosome in each cell of a human female. The condition is also known as triplo-X, trisomy X, XXX syndrome, and 47,XXX aneuploidy. Triple X results during division of a parent's reproductive cells, which occurs about once in every 1,000 births. People with trisomy X do not exhibit any symptoms and cannot be distinguished from normal XX females unless karyotyping is performed.
Cause
Triple X syndrome is not inherited, but usually occurs as a quite random event during the formation of reproductive cells (ovum and sperm). An error in cell division called nondisjunction can result in reproductive cells with additional chromosomes. For example, an oocyte or sperm cell may gain an extra copy of the X chromosome as a result of the nondisjunction. If one of these cells contributes to the genetic makeup of a child, the child will have an extra X chromosome in each of her cells. In some cases, trisomy X occurs during cell division in early embryonic development.
Some females with triple X syndrome have an extra X chromosome in only some of their cells. These cases are called 46,XX/47,XXX mosaics.
Symptoms
Due to inactivation and formation of a Barr body in all female cells, only one X chromosome is active at any time in a female cell. Thus, triple X syndrome most often causes no unusual physical features of medical problems. Females with the condition are usually taller than average, and their weight may be low in comparison to their height. They may have menstrual irregularities,and, although rarely exhibiting severe mental impariments, have an increased risk of learning disabilities, delayed speech, and language skills.
A similar range of body types and characteristics are present in both triple X and Klinefelter's syndrome. These include a lanky/youthful appearance, non-affectedness, or varying degrees of androgyny. The additional X chromosome can come from either the maternal or paternal side. Although body types and characteristics are distinguishable in triple X, the condition is verified only by karyotype testing.
Most woman with triple X have normal sexual development and are able to conceive children. A few may experience an early onset of menstruation. Triple X woman are rarely diagnosed, apart from pre-natal testing methods, such as amniocentesis. Most medical professionals do not regard the condition a disability. However, such status can be sought by parents for early intervention treatment if mild delays are present.
Incidence
Triple X syndrome occurs in around 1 in 1,000 girls. On average, five to ten girls with triple X syndrome are born in the United States each day.[1]
First case
The first published report of a woman with a 47,XXX karyotype was by Patricia A. Jacobs, et al. at Western General Hospital in Edinburgh, Scotland, in 1959. It was found in a 35-year-old, 5 ft. 9 in. (176 cm) tall, 128 lb. (58.2 kg) woman who had premature ovarian failure at age 19; her mother was age 41 and her father was 40 at the time of her conception.[1]
See also
References
External links
- NLM (2007). Triple X syndrome Genetics Home Reference
- Guy's Hospital Clinical Genetics Department (2001). Triple X information leaflet
- Nielsen, Johannes (1998). Triple-X Females. An Orientation. The Turner Center, Aarhus Psychiatric Hospital, Risskov, Denmark.
- Triple X information booklet by Dr. Nielsen, a psychiatrist and geneticist who led the longest running of 8 international newborn screening studies of sex chromosome abnormalities.
- Klinefelter Syndrome & Associates (http://www.genetic.org)
Pathology: chromosome abnormalities (Q90-Q99, 758) | |
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| Autosomal trisomies | Down syndrome (21), Edwards syndrome (18), Patau syndrome (13), Trisomy 9, Warkany syndrome 2 (8), Cat eye syndrome (22), Trisomy 22, Trisomy 16 |
| Autosomal monosomies/deletions | Wolf-Hirschhorn syndrome (4), Cri du chat (5), Angelman syndrome/Prader-Willi syndrome (15), Miller-Dieker syndrome/Smith-Magenis syndrome (17), 22q11.2 deletion syndrome (22) |
| X/Y linked | Monosomy: Turner syndrome (XO) Trisomy: Triple X syndrome (XXX), Klinefelter's syndrome (XXY), XYY, Other Karyotypes: XXXX, XXYY, XXXXX, XXXXY |
| Translocations | Philadelphia chromosome, Burkitt's lymphoma |
| Other | Fragile X syndrome, Gonadal dysgenesis (Mixed gonadal dysgenesis) |
cs:XXX syndrom de:Triplo-X-Syndrom fr:Syndrome triple X hu:Tripla X-szindróma nl:Triple X-syndroomsv:XXX syndrom
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
