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Rapid aneusomy detection in products of conception using the KaryoLite™ BACs‐on‐Beads™ assay
Author(s) -
Paxton Christian N.,
Brothman Arthur R.,
Geiersbach Katherine B.
Publication year - 2013
Publication title -
prenatal diagnosis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.956
H-Index - 97
eISSN - 1097-0223
pISSN - 0197-3851
DOI - 10.1002/pd.4003
Subject(s) - fluorescence in situ hybridization , karyotype , multiplex , products of conception , chromosome , microarray , microbiology and biotechnology , aneuploidy , biology , genetics , gene , gene expression , pregnancy , gestation
ABSTRACT Objective Chromosome analysis is the traditional method for detecting genetic abnormalities in products of conception, but it is prone to a high failure rate because of the requirement for cell culture. Molecular genetic tests do not require cell culture, but are either more expensive (e.g. chromosomal microarray) or less sensitive than chromosome analysis (e.g. fluorescence in situ hybridization, multiplex ligation mediated amplification). The KaryoLite™ BACs‐on‐Beads™ (KL‐BoBs™) assay is highly multiplexed with low resolution coverage and is designed to detect aneusomy for any chromosome. Methods We retrospectively tested 100 products of conception samples previously characterized by karyotype ( n = 90), and/or microarray ( n = 61) using KL‐BoBs™. We included samples extracted from either cultured or direct specimens from placental villi or fetal somatic tissue, with a variety of chromosomal abnormalities typically identified in our clinical cytogenetics laboratory. Results KL‐BoBs™ and microarray results were concordant for all cases of aneusomy. On the basis of a review of 3794 consecutive cases in our laboratory, aneusomy accounts for 74.3% of abnormalities detected. Polyploidy and structural abnormalities were not detected by KL‐BoBs™. Conclusion KL‐BoBs™ is potentially very useful as a first line test for aneusomy detection because of its lower cost, rapid detection, and ability to generate a molecular karyotype for samples that fail to grow in culture. © 2012 John Wiley & Sons, Ltd.