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beta+-Thalassemia intermedia with low HbF.

M A Zago, F F Costa, C Bottura

    Klinische Wochenschrift
    |January 17, 1983
    PubMed
    Summary

    Two cases of homozygous beta-thalassemia intermedia were identified in a Brazilian family. These individuals exhibited mild symptoms despite genetic factors typically associated with more severe forms of beta-thalassemia.

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    Area of Science:

    • Genetics
    • Hematology
    • Molecular Biology

    Background:

    • Beta-thalassemia is a group of inherited blood disorders characterized by reduced or absent synthesis of beta-globin chains.
    • Beta-thalassemia intermedia is a form of the disorder with clinical manifestations between thalassemia major and trait.
    • Genetic heterogeneity in beta-thalassemia alleles can lead to variable clinical presentations.

    Observation:

    • Two unrelated adults in a Brazilian family presented with features of beta-thalassemia intermedia.
    • Patients exhibited normal development and infrequent blood transfusions, with red blood cell morphology resembling thalassemia major.
    • Unusually low levels of hemoglobin F (HbF) were observed (5.0% and 6.8%) in these patients.

    Findings:

    • Globin chain synthesis analysis in reticulocytes was comparable to other beta-thalassemia homozygotes.
    • The genetic basis likely involves a particularly mild beta-thalassemia allele, possibly affecting one or both beta-globin genes.
    • Heterozygote family members showed typical features of beta-thalassemia trait with elevated HbA2.

    Implications:

    • Identifies a novel, mild beta-thalassemia allele contributing to a less severe clinical phenotype.
    • Highlights the importance of genetic variability in predicting beta-thalassemia severity.
    • Suggests potential for improved genotype-phenotype correlation in beta-thalassemia diagnosis and management.

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