Molecular Characterisation of α- and β-Thalassaemia among Indigenous Senoi Orang Asli Communities in Peninsular Malaysia

Danny Xuan Rong Koh, Raja Zahratul Azma Raja Sabudin, Malisa Mohd Yusoff, Noor Hamidah Hussin, Rahimah Ahmad, Ainoon Othman, Endom Ismail

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Thalassaemia is a public health problem in Malaysia, with each ethnic group having their own common mutations. However, there is a lack on data on the prevalence and common mutations among the indigenous people. This cross-sectional study was performed to determine the common mutations of α- and β-thalassaemia among the subethnic groups of Senoi, the largest Orang Asli group in Peninsular Malaysia. Blood samples collected from six Senoi subethnic groups were analysed for full blood count and haemoglobin analysis (HbAn). Samples with abnormal findings were then screened for α- and β-globin gene mutations. Out of the 752 samples collected, 255 showed abnormal HbAn results, and 122 cases showing abnormal red cell indices with normal HbAn findings were subjected to molecular screening. DNA analysis revealed a mixture of α- and β-globin gene mutations with 25 concomitant cases. The types of gene abnormalities detected for α-thalassaemia were termination codon (T>C) Hb CS (αCSα), Cd59 (G>A) haemoglobin Adana (Hb Adana) (αCd59α), initiation codon (ATG>A-G) (αIniCdα), two-gene deletion (-SEA), and single-gene 3.7-kb deletion (-α3.7). For β-thalassaemia, there were Cd26 (G>A) Hb E (βE), Cd19 (A>G) Haemoglobin Malay (Hb Malay) (βCd19), and IVS 1-5 (G>C) (βIVS 1-5).

Original languageEnglish
JournalAnnals of Human Genetics
DOIs
Publication statusAccepted/In press - 2017

Fingerprint

Thalassemia
Malaysia
Mutation
Globins
Genes
Hemoglobins
Abnormal Hemoglobins
Erythrocyte Indices
Initiator Codon
Terminator Codon
Gene Deletion
Ethnic Groups
Public Health
Cross-Sectional Studies
DNA

Keywords

  • Indigenous people
  • Mutation spectrum
  • Senoi Orang Asli
  • Thalassaemia

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

Cite this

Molecular Characterisation of α- and β-Thalassaemia among Indigenous Senoi Orang Asli Communities in Peninsular Malaysia. / Koh, Danny Xuan Rong; Raja Sabudin, Raja Zahratul Azma; Mohd Yusoff, Malisa; Hussin, Noor Hamidah; Ahmad, Rahimah; Othman, Ainoon; Ismail, Endom.

In: Annals of Human Genetics, 2017.

Research output: Contribution to journalArticle

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AB - Thalassaemia is a public health problem in Malaysia, with each ethnic group having their own common mutations. However, there is a lack on data on the prevalence and common mutations among the indigenous people. This cross-sectional study was performed to determine the common mutations of α- and β-thalassaemia among the subethnic groups of Senoi, the largest Orang Asli group in Peninsular Malaysia. Blood samples collected from six Senoi subethnic groups were analysed for full blood count and haemoglobin analysis (HbAn). Samples with abnormal findings were then screened for α- and β-globin gene mutations. Out of the 752 samples collected, 255 showed abnormal HbAn results, and 122 cases showing abnormal red cell indices with normal HbAn findings were subjected to molecular screening. DNA analysis revealed a mixture of α- and β-globin gene mutations with 25 concomitant cases. The types of gene abnormalities detected for α-thalassaemia were termination codon (T>C) Hb CS (αCSα), Cd59 (G>A) haemoglobin Adana (Hb Adana) (αCd59α), initiation codon (ATG>A-G) (αIniCdα), two-gene deletion (-SEA), and single-gene 3.7-kb deletion (-α3.7). For β-thalassaemia, there were Cd26 (G>A) Hb E (βE), Cd19 (A>G) Haemoglobin Malay (Hb Malay) (βCd19), and IVS 1-5 (G>C) (βIVS 1-5).

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