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- W33362830 abstract "Cytogenetic analysis was performed for a couple referred for recurrent pregnancy loss. Routine GTG banded studies revealed a 46,XY karyotype for the husband, but in the woman, an apparently balanced complex rearrangement involving chromosomes 12, 15, and 21 was detected. The 46,XX,t(12;15)(q13.3;q23),t(12;21)(q21;q11.2) karyotype is the consequence of 2 translocation events resulting in 3 rearranged chromosomes: (1) a derivative 12 arising from the exchange of the short arms of 12 and 21; (2) a derivative chromosome 15 consisting of segments of the long arms of chromosomes 12 and 15; and (3) a complex derivative chromosome 21 which includes the short arm and centromere of 21, and portions of the long arms of both chromosomes 12 and 15. Because the 12;21 translocation occurred at the centromeric region on both chromosomes, it was not possible to cytogenetically differentiate the derivative chromosomes 12 and 21. To clarify this issue, fluorescence in situ hybridization (FISH) was performed utilizing a 13/21 alpha-satellite probe. The location of the FITC signal clearly indicated a chromosome 21 centromere present on the derivative containing portions of all three chromosomes. A family history of spontaneous fetal losses suggested the possibility of a familial translocation. However, the likelihood of transmission of suchmore » a complex set of translocations is low, leading to the hypothesis that only one of the translocations was inherited with the second a de novo event in this individual. Karyotype analysis of both parents revealed no cytogenetic anomalies. Therefore, the extremely unusual occurrence of two independent translocations involving 3 chromosomes arose de novo in this patient.« less" @default.
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- W33362830 date "1994-09-01" @default.
- W33362830 modified "2023-09-29" @default.
- W33362830 title "FISH analysis in the derivation of a 12, 15, 21 complex chromosomal rearrangement" @default.
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