title: [Turner syndrome in a girl with marker chromosome in karyotype].
abstract: OBJECTIVE
  There are suggestion, that Turner syndrome (TS) patients with mosaic karyotype for a Y-DNA-containing cell line are at risk of Y-induced gonadoblastoma. The TS patients in whom some or all cells contain a marker chromosome of unknown origin and those in whom there is clitoromegaly or other evident virillisation should be tested by FISH or PCR techniques.
  
  
  METHODS
  The aim of our study to present a TS girl with mosaic karyotype and marker chromosome, which origin from X chromosome was detected by FISH method.
  
  
  METHODS
  5-years old girl in whom TS was established. Clinical analysis included the full dysmorphic and clinical phenotype of TS. Chromosome analysis was performed on peripheral blood samples using routine cytogenetic methods and FISH technique.
  
  
  RESULTS
  Clinical examination of girl showed many typical signs of TS besides of normal weight and length at birth and not typical for TS patients heart defect. First routine chromosome analysis, at age of 6 month, showed only 45,X cell line, Second study revealed mosaic karyotype with marker chromosome. FISH analysis for interphase nuclei and metaphase chromosomes using X centromere probe explained origin of marker from X chromosome. The karyotype was 45,X[155]/46,X,+mar[8].fish mar(X)(DXZ1+).
  
  
  CONCLUSIONS
  Presence of marker chromosome in karyotype of patient with TS may modify their phenotype and it is a indication for molecular examination by FISH technique.
authors.affiliation: Poradni Ginekologicznej Samodzielnego Publicznego Dzieciecego Szpitala Klinicznego im.dr L. Zamenhofa w Białymstoku.
authors.forename: I
authors.initials: I
authors.lastname: Chomczyk
authors.forename: B
authors.initials: B
authors.lastname: Panasiuk
authors.forename: A
authors.initials: A
authors.lastname: Wojda
authors.forename: E
authors.initials: E
authors.lastname: Hubert
authors.forename: A T
authors.initials: AT
authors.lastname: Midro
mesh_terms: D000293:Adolescent; D000886:Anthropometry; D002675:Child, Preschool; D002869:Chromosome Aberrations / Q000235:genetics; D025063:Chromosome Disorders; D002875:Chromosomes / Q000235:genetics*; D005260:Female; D005819:Genetic Markers / Q000235:genetics; D006801:Humans; D007621:Karyotyping / Q000379:methods; D010641:Phenotype; D016133:Polymerase Chain Reaction / Q000379:methods; D014424:Turner Syndrome / Q000235:genetics*; D014960:X Chromosome / Q000235:genetics
chemical_list: D005819:Genetic Markers