Synonyms
Monosomy X (45,X); Ullrich-Turner syndrome
Definition
Turner syndrome (TS) is a genetic disorder appearing in females, caused by a complete or partial absence of one of the X chromosomes that manifests in variable phenotypic features including short stature, endocrine deficiency, cardiac and renal anomalies, and neurocognitive and behavioral challenges.
Categorization
Variants of TS are classified on the basis of results from cytogenetic testing, which can reveal sex chromosome abnormalities by means of a karyotype (Davenport et al. 2007). Approximately half of the females diagnosed with TS have a complete absence of one of the X chromosomes, termed monosomy X (45,X). Other structural variants found in individuals with TS include duplication (isochromosome) of the long arm of one X chromosome i(Xq), long-arm deletion (Xq-), small distal short-arm deletions (Xp-), and ring X. Mosaicism is frequently observed, where some cells are missing an X chromosome (45,X), while one or...
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Pierpont, E.I., Berch, D.B., Mazzocco, M.M.M. (2018). Turner Syndrome. In: Kreutzer, J.S., DeLuca, J., Caplan, B. (eds) Encyclopedia of Clinical Neuropsychology. Springer, Cham. https://doi.org/10.1007/978-3-319-57111-9_1601
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