Prenatal Diagnosis of Down Syndrome and Common Chromosomal Disorders Using Molecular Karyotyping
Keywords:
Chromosomal disorders, Down syndrome, Microdeletion/microduplication syndromes, Molecular karyotyping, Prenatal diagnosisAbstract
For the prevention and control of Down syndrome and other chromosomal disorders, laboratory procedures for prenatal diagnosis should be established for high-risk pregnancies. A rapid molecular karyotyping assay, BACs-on-Beads (BoBsTM), has been developed for diagnosis of Down syndrome and common aneuploidies of chromosomes 13, 18, X and Y as well as nine microdeletion/microduplication syndromes. The study evaluated the performance of BoBsTM assay for prenatal diagnosis of Down syndrome and other chromosomal disorders in amniotic fluid samples (n = 1,004) obtained via amniocentesis between the 15th and 22th weeks of gestation in comparison with the gold standard conventional karyotyping. Interpretable results were obtained with BoBsTM assay in detection of 26 chromosome abnormalities comprising 23 aneuploidies (Down syndrome, n = 10; Edwards syndrome, n = 7; Klinefelter syndrome, n = 1; Patau syndrome, n = 1; Triple X syndrome, n = 1; and Turner syndrome n = 3) with 100% agreement with conventional karyotyping and three cases of microdeletion/microduplication syndromes [22q11.2 microdeletion (DiGeorge syndrome), n = 1 and 22q11.2 microduplication, n = 2] missed by conventional karyotyping. The assay has been implemented for prenatal diagnosis service at the National Institute of Health according to ISO 15189:2012. In conclusion, molecular BoBsTM assay provides a rapid and reliable method for detection of common aneuploidies and microdeletion/microduplication syndromes in uncultured prenatal samples and should be helpful in the prevention and control of Down syndrome and other chromosomal disorders in the country.
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