alexa Characterisation and confirmation of rare beta-thalassaemia mutations in the Malay, Chinese and Indian ethnic groups in Malaysia.
Nursing

Nursing

Advanced Practices in Nursing

Author(s): Tan JA, Chin PS, Wong YC, Tan KL, Chan LL, , Tan JA, Chin PS, Wong YC, Tan KL, Chan LL,

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Abstract AIMS: In Malaysia, about 4.5\% of the Malay and Chinese populations are heterozygous carriers of beta-thalassaemia. The initial identification of rare beta-globin gene mutations by genomic sequencing will allow the development of simpler and cost-effective PCR-based techniques to complement the existing amplification refractory mutation system (ARMS) and gap-PCR used for the identification of beta-thalassaemia mutations. METHODS: DNA from 173 beta-thalassaemia carriers and five beta-thalassaemia major patients from the Malay, Chinese and Indian ethnic groups were first analysed by ARMS and gap-PCR. Ninety-five per cent (174/183) of the 183 beta-globin genes studied were characterised using these two techiques. The remaining nine uncharacterised beta-globin genes (4.9\%) were analysed using genomic sequencing of a 904 bp amplified PCR product consisting of the promoter region, exon 1, intervening sequence (IVS) 1, exon 2 and the 5' IVS2 regions of the beta-globin gene. RESULTS: The rare beta-globin mutations detected in the Chinese patients were CD27/28 (+C) and CD43 (GAG-TAG), and -88 (C-T) in an Indian patient. Beta-globin mutations at CD16 (-C), IVS1-1 (G-A), IVS2-1 (G-A), -86 (C-G) and Haemoglobin South Florida (CD1, GTG-ATG) were confirmed in the Malay patients. CONCLUSIONS: The seven rare beta-globin mutations and a rare haemoglobin variant confirmed in this study have been described in other populations but have not been previously described in Malaysian beta-thalassemia patients. This article was published in Pathology and referenced in Advanced Practices in Nursing

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