Segmental duplications involving the α-globin gene cluster are causing β-thalassemia intermedia phenotypes in β-thalassemia heterozygous patients

C. L. Harteveld, C. Refaldi, E. Cassinerio, M. D. Cappellini, P. C. Giordano

Research output: Contribution to journalArticle

Abstract

We describe two cases of simple heterozygosity for the common β°-thalassemia mutation β39 (C → T), both presenting with a thalassemia intermedia phenotype. In both cases synergic effect deriving from membrane defects or red cell enzyme deficiencies were excluded. In one case a triplication of the α-globin genes was found which did not justify the severity of the transfusion-dependent phenotype. Multiplex ligation-dependent probe amplification (MLPA) analysis of the α-globin gene cluster revealed two new rearrangements, consisting of a full duplication of the α-globin genes locus including the upstream regulatory element. In one case the duplication was in the presence of the common anti-α3.7 triplication in trans, resulting in a total of 7 active α-globin genes. In the other case the duplicated allele and the normal allele in trans resulted into a total of 6 active α-globin genes. We report the clinical and hematological data and the molecular analysis and discuss the occurrence of α-globin genes duplication defects in cases of β-thalassemia heterozygotes with thalassemia intermedia phenotypes.

Original languageEnglish
Pages (from-to)312-316
Number of pages5
JournalBlood cells, molecules & diseases
Volume40
Issue number3
DOIs
Publication statusPublished - May 2008

Keywords

  • α-globin genes
  • 16p
  • MLPA
  • Thalassemia intermedia

ASJC Scopus subject areas

  • Molecular Biology
  • Molecular Medicine
  • Hematology

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