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KMID : 0361720040150040356
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Korean Journal of perinatology
2004 Volume.15 No. 4 p.356 ~ p.361
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Original Reports : Prenatal Diagnosis of Yq Deletion by Cytogenetic and Fluorescence in Situ Hybridization
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Park In-Yang
Cheon So-Hee
Kim Myung-Shin
Son Jung-Ok
Lee Young
Shin Jong-Chul
Kim Chang-Yee
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Abstract
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Objective: The accurate evaluation of a marker chromosome has been limited during prenatal karyotyping. We proposed a method of step-by-step approach to evaluate the origin of a marker chromosome.
Methods: A patient with 19 weeks of gestation was transferred to our hospital for karyotyping due to abnormal Triple test. Karyotyping of amniotic fluid was performed. NOR (nucleolar organizer region) banding and FISH (fluorescence in situ hybridization) using two types of sex chromosome probes: chromosome X α satellite probe (DXZI) & chromosome Y α satellite probe (DYZ3)(Cytocell, Bambury, UK) and CEP X/Y (Xp11.1-q11.1 CEP X α satellite & Yq12 CEP Y satellite III)(Vysis, IL, USA) were done.
Results: The routine chromosomal analysis showed 46,X,+mar. As the result of NOR banding, we supposed that the marker chromosome was less likely originated from acrocentric chromosomes. FISH analysis revealed Y centromere signal on marker chromosome, but Yq12 signal was not detected. Therefore the marker chromosome was identified as Y chromosome formed by deletion at Yq11.2.
Conclusion: This study demonstrated that FISH and NOR banding technique is more effective method for a marker chromosome evaluation during prenatal karyotyping.
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KEYWORD
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Y chromosome structural aberration, Yq deletion, Fluorescence in situ hybridization, Nucleolar organizer region
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