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    题名: Rapid positive confirmation of mosaicism for a small supernumerary marker chromosome as r(8) by interphase FISH, QF-PCR and aCGH on uncultured amniocytes in a pregnancy with fetal pyelectasis
    作者: 陳持平;Chen, Chih-Ping;Chen-Wen Pan,;Wang, Wayseen
    贡献者: 生物科技學系
    关键词: array comparative genomic hybridization;interphase fluorescence in situ hybridization;prenatal diagnosis;quantitative fluorescent polymerase chain reaction;small supernumerary marker chromosome;supernumerary ring chromosome 8
    日期: 2012-09
    上传时间: 2012-11-23 17:18:54 (UTC+8)
    摘要: "Objective
    This study aimed at presenting prenatal diagnosis and molecular cytogenetic characterization of a small supernumerary marker chromosome (sSMC) derived from chromosome 8 by fluorescence in situ hybridization (FISH), quantitative fluorescent polymerase chain reaction (QF-PCR), and array comparative genomic hybridization (aCGH) on uncultured amniocytes.

    Materials, Methods, and Results
    A 32-year-old woman underwent amniocentesis at 19 weeks of gestation because of fetal pyelectasis. Amniocentesis revealed a de novo ring-shaped sSMC in two of 21 colonies of cultured amniocytes. Repeated amniocentesis at 22 weeks of gestation revealed a karyotype of 47,XY,+mar[8]/46,XY[32] in cultured amniocytes. Spectral karyotyping and FISH confirmed that the sSMC was derived from chromosome 8. She underwent a third amniocentesis at 26 weeks of gestation. Oligonucleotide-based aCGH analysis on uncultured amniocytes demonstrated a 43 Mb genomic gain in chromosome 8 encompassing 8p22→q12.1. Polymorphic DNA marker analysis of the uncultured amniocytes revealed a maternal origin of the sSMC and excluded uniparental disomy 8. Interphase FISH analysis showed three D8Z2 signals in 8/40 (20%) of uncultured amniocytes. The cultured amniocytes had a karyotype of 47,XY,+r(8)(p22q12.1)[3]/46,XY[37]. The pregnancy was carried to term, and an apparently normal baby, weighing 3300 g, was delivered with mild hydronephrosis but no other phenotypic abnormalities. The cord blood was found to have a karyotype of 47,XY,+r(8)(p22q12.1)[2]/46,XY[38].

    Prenatal diagnosis of fetal pyelectasis should alert obstetricians of chromosome aberration. Interphase FISH, QF-PCR, and aCGH analyses on uncultured amniocytes are helpful in rapid positive confirmation of an sSMC detected at amniocentesis."
    關聯: Taiwanese Journal of Obstetrics & Gynecology
    显示于类别:[生物科技學系] 期刊論文


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