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Molecular genetics of beta-thalassaemia in Pakistan: a basis for prenatal diagnosis
Insights
Beta-thalassaemia is a common inherited blood disorder in Pakistan. Characterizing mutations aids in developing effective prenatal diagnosis and prevention strategies for this significant health issue.
Area of Science:
- Genetics
- Public Health
- Molecular Biology
Background:
- Thalassaemia is Pakistan's most prevalent inherited disorder.
- Inadequate treatment facilities necessitate a focus on prevention.
- Over 4000 individuals are born with beta-thalassaemia annually in Pakistan.
Purpose of the Study:
- To characterize beta-thalassaemia alleles in Pakistan's major ethnic groups.
- To identify prevalent mutations for targeted prevention strategies.
- To provide a basis for prenatal diagnosis in a high-frequency region.
Main Methods:
- Molecular characterization of 1216 beta-thalassaemia alleles.
- Analysis of mutations across five major Pakistani ethnic groups.
- Identification and frequency determination of specific beta-thalassaemia mutations.
Main Results:
- A spectrum of 19 different beta-thalassaemia mutations was identified.
- The five most common mutations (IVSI-5, Fr 8-9, del 619, Fr 41-42, IVSI-1) account for 82.3% of alleles.
- Significant ethnic and regional variations in mutation prevalence were observed, with distinct patterns in Northern and Southern Pakistan.
Conclusions:
- Findings provide a comprehensive mutation profile for beta-thalassaemia in Pakistan.
- Understanding regional mutation prevalence is crucial for effective genetic screening and prenatal diagnosis.
- This data supports the development of targeted prevention programs to reduce the burden of beta-thalassaemia.
Abstract:
Thalassaemia is the most common inherited disorder in Pakistan and there are very inadequate treatment facilities for over 4000 homozygotes born each year. Prevention of these disorders therefore forms an essential part of the management of this enormous health problem. We have characterized 1216 beta-thalassaemia alleles from the five major ethnic groups of Pakistan. The complete spectrum comprised 19 different mutations. There are important ethnic and regional differences in the prevalence of mutations. The five most common mutations, IVSI-5 (G-C) (37.3%), Fr 8-9 (+G) (25.9%), del 619 (7.0%), Fr 41-42 (-TTCT) (6.7%) and IVSI-1 (G-T) (5.4%), constitute 82.3% of the total. Fr 8-9 (+G) is the most common mutation in Northern Pakistan (41.3%), whereas IVSI-5 (G-C) is the most frequent mutation in Southern Pakistan (52.2%). Six subjects with transfusion-dependent thalassaemia major showed only a single mutant allele. One subject with transfusion-dependent thalassaemia major showed a novel 17 bp deletion involving Cd126-131. Our findings provide a comprehensive basis for carrying out prenatal diagnosis of thalassaemia in a geographical area where it is found in high frequency.