Evidence of a mechanism for isodicentric chromosome Y formation in a 45,X/46,X,idic(Y)(p11.31)/46,X,del(Y)(p11.31) mosaic karyotype

Shalini C. Reshmi, Jennifer L. Miller, Dianne Deplewski, Clare Close, Leslie J. Henderson, Elizabeth Littlejohn, Stuart Schwartz, Darrel J. Waggoner*

*Corresponding author for this work

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Abnormalities involving sex chromosomes account for approximately 0.5% of live births. The phenotypes of individuals with mosaic cell lines having structural aberrations of the X and Y chromosomes are variable and hard to accurately predict. Phenotypes associated with sex chromosome mosaicism range from Turner syndrome to males with infertility, and often present with ambiguous genitalia. Previous studies of individuals with an 45,X/46,X,idic(Y)(p11) karyotype suggest that the presence of both cell lines should result from an intermediate, 46,XY cell line. Here we report a 2.5 year old female with phenotypic features of Turner syndrome with an isodicentric Y chromosome and a cell line with a deleted Y with a final karyotype of 45,X/46,X,idic(Y)(p11.31)/46,X,del(Y)(p11.31). Fluorescence in situ hybridization (FISH) mapping of the Y chromosome breakpoint revealed very low percentages of the deleted Y cells, but suggested a potential mechanism for the formation of the isodicentric Y chromosome. To our knowledge, the 46,X,del(Y) intermediate cell line in our patient has not been previously reported in individuals with mosaic sex chromosome structural abnormalities.

Original languageEnglish (US)
Pages (from-to)161-164
Number of pages4
JournalEuropean Journal of Medical Genetics
Volume54
Issue number2
DOIs
StatePublished - Mar 1 2011

Keywords

  • Ambiguous genitalia
  • Chromosome Y deletion
  • Gonadal mosaicism
  • Isodicentric Y
  • Mosaic karyotype
  • Turner syndrome

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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