Abstract
We report our work on prenatal diagnosis of α-thalassemia, β-thalassemia and other hemoglobinopathies in southern Thailand. DNA-based diagnosis was offered to 1906 pregnancies at risk for thalassemia using a combination method of multiplex-PCR and reverse dot blot analysis to detect seven α-globin and 47 β-globin mutations. The most commonly detected mutation of α0-thalassemia was a South-East Asian deletion (98%), followed by a Thai deletion (2%). Twenty-eight β-globin mutations were identified. Fourteen common mutations, including cod 19 A-G (18.6%), cod 41/42 -TCTT (14.4%), IVS1#5 G-C (13.2%), 3.5 kb deletion (9.2%), cod 17 A-T (7.7%), -28 A-G (7.3%), IVSI#1 G-T (7.1%), 12.5 kb deletion (δβ)0 (5.7%), HPFH6 (4.2%), IVS2#654 C-T (2.7%), 45 kb deletion (1.9%), Asian Indian-inversion-deletion Gγ(Aγδβ)0 (1.6%), cod 41 -C (1.5%) and cod 71/72 +A (1.3%) were detected, accounting for 96.5% of all mutations detected. The most common hemoglobin variant was Hb E, accounting for 97.86%. Prenatal diagnosis of 1906 couples at risk showed 22.0% normal, 51.2% carrier and 26.8% affected. The present study provides important information for diagnosis and control of severe thalassemia diseases.
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Acknowledgements
The authors would like to thank the staff of Hematology and Thalassemia Laboratory of the Department of Pathology for technical support. The authors would also like to thank the staff of the Antenatal Care Unit and Maternal-Fetal Medicine Unit of the Department of Obstetrics and Gynecology for genetic counseling and fetal specimen collection. This research was supported by a grant (MED36202) from Faculty of Medicine, Prince of Songkla University and National Research Council of Thailand. This study was approved by the ethics committee of the Faculty of Medicine, Prince of Songkla University (REC.61-307-5-2).
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Chamnong designed the research study, interpreted the data, and wrote the manuscript. Chawadee, Vannarat, Sataron, and Korntip performed the research and collected the data. The final version of the article was read and approved by all of the authors.
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Nopparatana, C., Nopparatana, C., Saechan, V. et al. Prenatal diagnosis of α- and β-thalassemias in southern Thailand. Int J Hematol 111, 284–292 (2020). https://doi.org/10.1007/s12185-019-02761-4
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DOI: https://doi.org/10.1007/s12185-019-02761-4