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pubmed-article:8779552pubmed:abstractTextThe beta-thalassaemia mutations in 20 Malaysian children with beta-thalassaemia major were characterised by using a multi-modal approach, consisting of a slot-blot hybridisation with selected allele-specific oligonucleotides (ASO), followed by reverse dot-blot assay (RDB), amplification refractory mutation system (ARMS) and genomic sequencing. This strategy yielded a 94.4% mutation detection rate. The 6 most common mutations were codons 41/42 (-TTCT), IVS II nt 654(C --> T), IVS I nt 5(G --> C), IVS I nt 1(G -->T), codon 35 (-C) and codon 19 (A --> G), which accounted for 83.3% of all mutations detected. A strategy of initial screening with the above 6 selected ASOs for slot-blot hybridisation followed by RDB assay for the less common Asian mutations would give a mutation identification of 91.7%. Another feasible approach would be to analyse alleles from a particular racial group, by a judicious selection of 4 ASOs common to that particular subpopulation and then supplement this with RDB assay. This could yield a 100% coverage for the Chinese subpopulation in Malaysia. With these strategies, a practical approach has been identified to overcome the pitfalls posed by the molecular heterogeneity of beta-thalassaemia to enable prenatal diagnosis and carrier screening to be carried out. Regional collaborative studies are to be encouraged as an indispensable tool in providing better health care services to our patients.lld:pubmed
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pubmed-article:8779552pubmed:dateRevised2009-11-19lld:pubmed
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pubmed-article:8779552pubmed:articleTitleMolecular heterogeneity of beta-thalassaemia in Malaysia: a practical approach to diagnosis.lld:pubmed
pubmed-article:8779552pubmed:affiliationDepartment of Paediatrics, University Hospital, Kuala Lumpur, Malaysia.lld:pubmed
pubmed-article:8779552pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:8779552pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed