Chimaerism shown by cytogenetics and DNA polymorphism analysis.

Abstract:

:A child with ambiguous genitalia, brought up phenotypically male, had a 46,XX/46,XY karyotype. At laparotomy, he had a left sided ovary and uterus, and a right sided scrotal testis. The 46,XX line made up 50% of cells in the blood and 90% of cells in a skin biopsy. There were no cytogenetic polymorphisms. Analysis of lymphocyte DNA with seven polymorphic DNA markers showed him to be chimaeric, with four, three, and two parental alleles at different loci. He had one paternal and one maternal X chromosome at the marker DXS1053. Based on our data, we would suggest that chimaerism arose as a result of postzygotic fusion of two embryos. We have shown by DNA polymorphisms the presence of autosomal chimaerism in a case of sex chromosome chimaerism, and indicated the usefulness of DNA polymorphisms in determining the origin of chimaerism.

journal_name

J Med Genet

authors

Green AJ,Barton DE,Jenks P,Pearson J,Yates JR

doi

10.1136/jmg.31.10.816

subject

Has Abstract

pub_date

1994-10-01 00:00:00

pages

816-7

issue

10

eissn

0022-2593

issn

1468-6244

journal_volume

31

pub_type

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