Next-generation sequencing improves molecular epidemiological characterization of thalassemia in Chenzhou Region,...

Thalassemia is a highly prevalent monogenic inherited disease in southern China. It is important to collect epidemiological data comprehensively for proper prevention and treatment.

In this study, blood samples collected from 15 807 residents of Chenzhou were primarily screened by hematological tests. A total of 3973 samples of suspected thalassemia carriers were further characterized by combined next-generation sequencing (NGS) and Gap-PCR.

In total, 1704 subjects were diagnosed as thalassemia carriers with a total prevalence rate of 10.78%, including 943 α-thalassemia carriers, 708 β-thalassemia carriers, and 53 composite α and β-thalassemia carriers. The prevalence rates of α-thalassemia, β-thalassemia, and composite α and β-thalassemia were 5.97%, 4.48%, and 0.34%, respectively. Meanwhile, we characterized 19 α-thalassemia variations and 21 β-thalassemia variations in thalassemia carriers. Approximately 2.88% of thalassemia carriers would be missed by traditional genetic analysis. In addition, four novel thalassemia mutations and one novel abnormal hemoglobin mutation were identified.

Our data suggest a high prevalence of thalassemia and a diverse spectrum of thalassemia-associated variations in Chenzhou. Also, combined NGS and Gap-PCR is an effective thalassemia screening method. Our findings might be helpful for prevention and treatment of thalassemia in this region.