Molecular diagnostics of the HBB gene in an Omani cohort using bench-top DNA Ion Torrent PGM technology

Area of Science:

• Genetics
• Molecular Biology
• Medical Diagnostics

Background:

• Hemoglobinopathies, including sickle cell disease (SCD) and beta-thalassemia major (TM), are common autosomal recessive disorders globally, particularly prevalent in Oman.
• Effective primary prevention strategies rely on early carrier screening and diagnosis.
• The need for high-throughput genetic analysis is increasing with the potential implementation of mandatory population screening programs.

Purpose of the Study:

• To evaluate the efficacy of Ion Torrent PGM next-generation sequencing for rapid and accurate molecular diagnosis of hemoglobinopathies.
• To assess the feasibility of using Ion Torrent PGM for large-scale genetic screening in a population with a high prevalence of hemoglobinopathies.

Main Methods:

• Analysis of 297 unrelated Omani cases using the Ion Torrent PGM sequencer.
• Application of barcoded uni-directional or bi-directional sequencing methodologies for the beta-globin (HBB) gene.
• Comparison with standard Sanger sequencing protocols for molecular diagnosis.

Main Results:

• Reliable identification of disease-causing mutations in the beta-globin (HBB) gene within the studied cohort.
• Demonstration of Ion Torrent PGM's capability for rapid sequencing of a small gene in a large number of samples.
• Significant reduction in cost and workload compared to traditional methods, with accurate diagnostic outcomes.

Conclusions:

• Ion Torrent PGM sequencing is a viable and efficient alternative to ABI sequencing for diagnosing hemoglobinopathies.
• The platform's capacity to analyze hundreds of patients simultaneously makes it suitable for future molecular screening initiatives.
• This technology holds promise for the diagnosis of various genetic disorders beyond hemoglobinopathies.