Rare β-Globin Gene Mutations including a de novo Mutation of Hemoglobin Hammersmith in Southern Thailand

Autor: Korntip Srewaradachpisal, Wanicha Tepakhan, Sataron Kanjanaopas, Chawadee Nopparatana, Malai Wongchanchailert, Chamnong Nopparatana
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Journal of Health Science and Medical Research (JHSMR), Vol 38, Iss 3, Pp 221-229 (2020)
Druh dokumentu: article
ISSN: 2586-9981
2630-0559
DOI: 10.31584/jhsmr.2020741
Popis: Objective: The aim of this study was to characterize unknown β-globin gene mutations in individuals who attended Songklanagarind Hospital for thalassemia screening and genetic counseling. Material and Methods: β-thalassemia mutations in individuals with hemoglobin (Hb) A2 levels >3.5% originating from various provinces in southern Thailand were characterized by reverse dot blot hybridization (RDB) and multiplex gappolymerase chain reaction using a panel of 30 allele-specific probes for point mutations and 6 sets of specific primers for large deletions. Mutations which could not be identified by these two methods were further analyzed by direct deoxyribonucleic acid (DNA) sequencing. Results: Nineteen subjects found to have uncharacterized β-globin gene mutations were analyzed by direct DNA sequencing. Nine different rare mutations were identified, four of which have not been to date described in Thailand: -30 (T>C), codon 5 (-CT), Hb Monroe (codon 30, G>C) and Hb Hammersmith (codon 42, T>C). An Hb Hammersmith mutation detected in one subject appeared to be a spontaneous mutation, unrelated to family history. The other five mutations have been reported previously within Thailand, but here they were identified in the southern part of Thailand for the first time: -31 (A>G), codon 15 (-T), codon 35 (C>A), codon 95 (+A) and Hb Dhonburi (codon 126, T>G). The presence of the mutations was confirmed by RDB. Conclusion: In addition to the already reported β-globin gene mutations, 9 other different types of mutations were identified. This information should be useful for planning genetic counseling and prenatal diagnosis programs for prevention and control of thalassemia diseases.
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