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Alpha-thalassaemia.

Cornelis L Harteveld1, Douglas R Higgs

  • 11Department of Human and Clinical Genetics, Leiden University Medical Center, Einthovenweg 20, 2333ZC Leiden, The Netherlands.

Orphanet Journal of Rare Diseases
|May 29, 2010
PubMed
Summary
This summary is machine-generated.

Alpha-thalassaemia is a common inherited blood disorder causing anemia, ranging from mild to lethal. Genetic mutations affecting alpha-globin genes determine disease severity and require molecular analysis for diagnosis.

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Area of Science:

  • Genetics
  • Hematology
  • Molecular Biology

Background:

  • Alpha-thalassaemia is an autosomal recessive disorder, a prevalent monogenic condition globally, particularly in Mediterranean, Asian, African, and Middle Eastern regions.
  • Its incidence is rising in North America and Europe due to demographic shifts.
  • Clinical presentation varies from asymptomatic to lethal hemolytic anemia, with severity linked to the number of deleted alpha-globin genes.

Purpose of the Study:

  • To provide a comprehensive overview of alpha-thalassaemia, including its genetic basis, clinical spectrum, and diagnostic approaches.
  • To highlight the genotype-phenotype correlations and the impact of different mutations on disease severity.
  • To discuss management strategies and genetic counseling for affected individuals and families.

Main Methods:

  • Review of existing literature on alpha-thalassaemia genetics, clinical manifestations, and diagnostic techniques.
  • Classification of alpha-thalassaemia based on genotype and phenotype.
  • Description of diagnostic criteria, including hematological parameters and molecular analysis.

Main Results:

  • Alpha-thalassaemia results from deletions in alpha-globin genes, leading to reduced or absent alpha-globin synthesis.
  • HbH disease and Hb Bart's hydrops foetalis represent severe forms, with distinct hematological profiles and clinical outcomes.
  • Molecular analysis is crucial for accurate diagnosis, especially for silent carriers and alpha-thalassaemia trait.

Conclusions:

  • Alpha-thalassaemia exhibits a wide clinical spectrum determined by the number of affected alpha-globin genes.
  • Accurate diagnosis through molecular analysis is essential for appropriate management and genetic counseling.
  • Management strategies vary from supportive care for mild cases to transfusions for HbH disease and termination for Hb Bart's hydrops foetalis.