trisomy X; triple X syndrome
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Etiology
- not inherited
- generally results from nondisjunction of oocytes or spermatocytes resulting in an extra X chromosome in the affected gamete
Epidemiology
- occurs in 1/1000 newborn females
Genetics
- 47, XXX karyotype
- some females 3 X chromosomes in only some of their cells (46,XX/47,XXX mosaics)
Clinical manifestations
- normal female phenotype
- may be taller than average
More general terms
Additional terms
References
- ↑ Wikipedia: Triple X syndrome http://en.wikipedia.org/wiki/Triple_X_syndrome
- ↑ Genetics Home Reference http://ghr.nlm.nih.gov/condition/triple-x-syndrome
- ↑ University of Michigan: XXX Syndrome (Trisomy X) http://www.med.umich.edu/yourchild/topics/xxxsyn.htm
- ↑ Mayo Clinic: Triple X syndrome http://www.mayoclinic.com/health/triple-x-syndrome/DS01090/DSECTION=causes