Rapid positive confirmation of mosaicism for a small supernumerary marker chromosome as r(8) by interphase fluorescence in situ hybridization,quantitative fluorescent polymerase chain reaction,and array comparative genomic hybridization on uncultured amniocytes in a pregnancy with fetal pyelectasis |
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| Authors: | Chih-Ping Chen Shuenn-Dyh Chang Yi-Ning Su Ming Chen Schu-Rern Chern Jun-Wei Su Yu-Ting Chen Wen-Lin Chen Chen-Wen Pan Meng-Shan Lee Wayseen Wang |
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| Affiliation: | 1. Department of Medicine, Mackay Medical College, New Taipei City, Taiwan;2. Department of Obstetrics and Gynecology, Mackay Memorial Hospital, Taipei, Taiwan;3. Department of Medical Research, Mackay Memorial Hospital, Taipei, Taiwan;4. Department of Biotechnology, Asia University, Taichung, Taiwan;5. School of Chinese Medicine, College of Chinese Medicine, China Medical University, Taichung, Taiwan;6. Institute of Clinical and Community Health Nursing, National Yang-Ming University, Taipei, Taiwan;7. Department of Obstetrics and Gynecology, School of Medicine, National Yang-Ming University, Taipei, Taiwan;8. Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Lin-Kou Medical Center, Chang Gung University, Tao-Yuan, Taiwan;9. Department of Medical Genetics, National Taiwan University Hospital, Taipei, Taiwan;10. Department of Medical Research, Center for Medical Genetic, Changhua Christian Hospital, Changhua, Taiwan;11. Department of Genomic Medicine, Center for Medical Genetic, Changhua Christian Hospital, Changhua, Taiwan;12. Department of Obstetrics and Gynecology, Changhua Christian Hospital, Changhua, Taiwan;13. Department of Obstetrics and Gynecology, China Medical University Hospital, Taichung, Taiwan;14. Department of Bioengineering, Tatung University, Taipei, Taiwan |
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| Abstract: | ObjectiveThis 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 ResultsA 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].ConclusionPrenatal 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. |
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