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  • Title: Semi-nested Taqman real-time quantitative PCR for noninvasive prenatal diagnosis of Bart's hydrops fetalis.
    Author: Pornprasert S, Sukunthamala K, Kunyanone N, Sittiprasert S, Thungkham K, Junorse S, Pongsawatkul K, Pattanaporn W, Jitwong C.
    Journal: J Med Assoc Thai; 2012 Jan; 95(1):6-9. PubMed ID: 22379734.
    Abstract:
    BACKGROUND: Non-invasive prenatal diagnosis based on detection of fetal cell-free DNA is limited when mother and father are both carriers for the same autosomal recessive mutation. OBJECTIVE: Develop the semi-nested Taqman real-time PCR for quantification of alpha-thalassemia-1 SEA type deletion allele in plasma of alpha-thalassemia-1 SEA carriage pregnancies. MATERIAL AND METHOD: Plasma DNA was extracted from six women who carried fetuses with normal, 11 with heterozygote alpha-thalassemia-1 SEA type deletion and seven with Bart's hydrops fetalis. DNA was amplified using conventional PCR with the primary specific primer set for alpha-thalassemia-1 SEA type deletion. PCR product was then subjected to the semi-nested real-time PCR using the secondary specific primer and Taqman probe set for alpha-thalassemia-1 SEA type deletion. The standard curve was constructed using ten-fold serial dilutions of conventional PCR product of the heterozygote alpha-thalassemia-1 SEA type deletion. RESULTS: Women who carried fetuses with Bart's hydrops fetalis displayed a trend toward higher mean copy number of alpha-thalassemia-1 SEA type deletion allele vs. women who carried fetuses with normal and heterozygote, albeit not reaching statistical significance. CONCLUSION: The maternally inheritedfetal allele present in maternal plasma is difficult to discern the fetal cell-free DNA from a higher background DNA of the mother Thus, further investigation is needed to improve the diagnosis ofBart's hydrops fetalis using this technique.
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