Background: Thalassemia is the most common monogenic disease worldwide. The severity of thalassemia depends on the degree of imbalance between the α-globin and β-globin chains. The aims of the current study were (1) to describe clinical and hematological characteristics of β-thalassemia patients; and (2) to investigate mutations of β-globin gene using Sanger sequencing, as well as the association between β-globin genotype and severity of β-thalassemia. Materials and method: 57 β-thalassemia patients treated at Hue Central Hospital were examined by sequencing the whole β-globin gene. Results: 80.7% with β-thalassemia intermedia, 19.3% with β-thalassemia major. Patients had 100% anemia, 75.4% splenomegaly, 50.9% hepatomegaly, 38.6% thalassemia facies, 28.1% jaundice and 15.8% iron overload; The red blood cell indices were decreased: Hb 7.5 ± 1.3 g/dL, MCV 70.9 ± 8.4 fL, MCH 20.5 ± 2.1 pg. Hemoglobin composition included HbA 35.2 ± 33.9%, HbA2 6.1 ± 2.7%, HbF 24.8 ± 18.0%, and HbE 38.6 ± 15.2%. Nine β-globin gene mutations were observed. The most common genotype was βE/β0, which occupied 80.7%. The βE/βA, β0/βA and βE/β+ genotypes were only found in β-thalassemia intermedia individuals, while the β0/β0 genotype was limited to β-thalassemia major patients. The βE/β0 genotype was seen in both types. Conclusion: There was differences in age of blood transfusion initiation between the genotypes. Among them, the β0/β0 genotype was the most severe. Key words: β-thalassemia intermedia, β-thalassemia major, genotype.
Background: Hemoglobinopathy is the most common monogenic disease worldwide. The aims of the current study were: (1) to investigate some hematological characteristics of patients with hemoglobinopathies; and (2) to detect the mutation of α-globin and β-globin genes, as well as the association between genotype and degree of anemia. Materials and method: 251 patients with hemoglobinopathies were examined for the α-globin or β-globin gene mutations. Results: 51% were the carriers, and 49% were thalassemia intermedia or thalassemia major. Hematological characteristics were suitable for α-thalassemia or β-thalassemia. Elevenβ-globin gene mutations were observed. The β0/βA, βE/βA, βE/βE, βE/β+, β+/β+ genotypes were only found in β-thalassemia intermedia individuals; the β0/β0 genotype was limited to β-thalassemia major patients; the β+/β0 and βE/β0 genotypes were seen in both types. Four α-globin gene mutations were observed. All α-thalassemia patients were intermedia, the most common genotype was --SEA/-α3.7. Conclusion: There were differences in anemia degree between β-globin genotypes Key words: hemoglobinopathies, α-globin, β-globin.
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