Cytogenetic and clinical characteristics of a case involving complete duplication of Xpter→Xq13

Syed M. Jalal*, Richard Dahl, Lisa Erickson, Donald Zimmerman, Noralane Lindor

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


True isochromosomes for Xp probably do not exist in a liveborn. We describe a rare case of complete Xp duplication and retention of the inactivation centre at Xql3. Cytogenetieally, it is described as a nonmosaic 46,X,psu idic(X)(ql3). Complete duplication of XpterXql3 was confirmed by banded analysis and FISH probes for X centromere Xp21 XIST locus and whole chromosome paints for X and Y. The abnormal X was always late replicating. Clinically, the patient was short statared had primary amenorrhoea and incomplete development of secondary sexual characteristics but otherwise was phenotypically normal. There are no nonmosaic reported cases with complete lupllcation of i(Xp) confirmed by FISH or molecular techniques. Those cases with partial duplication of Xp and presence of the inactivation centre share the traits of amenorrhoea and poor secondary sexual development. To develop a clinical profile of duplication of Xp (in presence of Xql3) there is a need to study more cases.

Original languageEnglish (US)
Pages (from-to)237-239
Number of pages3
JournalJournal of medical genetics
Issue number3
StatePublished - 1996


  • I(Xp) duplication characteristics

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)


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