Niu DM, Pan CC, Lin CY, Hwang B, Chung MY. Mosaic or chimera? Revisiting an old hypothesis about the cause of the 46,XX/46,XY hermaphrodite.
J Pediatr 2002;
140:732-5. [PMID:
12072878 DOI:
10.1067/mpd.2002.124321]
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Abstract
OBJECTIVES
A cell lineage in a hermaphrodite infant showing a 46,XX/46,XY karyotype was analyzed to determine the genetic contribution from both parents and identify the underlying mechanism.
STUDY DESIGN
Genotype analysis was performed by using 57 microsatellite markers, 39 distributed on 9 autosomes and 18 on the X-chromosome. Two X- and Y-specific markers were analyzed to confirm the presence and percentages of cells containing a Y-chromosome.
RESULTS
The proband revealed a single maternal and paternal allele for all of the informative autosomal and X-chromosome markers. Analysis of the X- and Y-specific markers confirmed that approximately 20% of the patient's peripheral blood cells contained the Y chromosome.
CONCLUSIONS
The data suggest that the patient's hermaphroditism was the result of a mosaic embryo and not a chimera. The most likely mechanism involved 2 separate nondisjunction events, resulting in the loss of 47,XXY cells during early embryonic development.
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