PMID: 9450794Feb 5, 1998Paper

Beta-thalassaemia intermedia: is it possible consistently to predict phenotype from genotype?

British Journal of Haematology
P J HoS L Thein

Abstract

Eighty-seven patients with beta thalassaemia of intermediate severity were investigated in our Unit to determine whether it is possible to consistently predict phenotypic severity from genotypic factors. The subjects were from the following ethnic backgrounds: Asian Indian (35.1%), Middle Eastern (24.3%), Mediterranean (21.6%), Northern European (14.9%) and South-East Asian/Chinese (4.1%). There was a wide spectrum of phenotypic severity; 49 had mild disease, 22 moderate and 16 severe disease. 22/87 patients had inherited only a single copy of a beta-thalassaemia allele, of whom 11 had also co-inherited triplicated alpha genes (alpha alpha alpha/alpha alpha or alpha alpha alpha/alpha alpha alpha) and seven had dominantly inherited beta thalassaemia. In four of the heterozygotes no explanation was found for the thalassaemia-intermedia phenotype. 65/87 patients were homozygous or compound heterozygous for 26 mutations (40 genotypes) which ranged from very mild beta+ to beta0 thalassaemia alleles. All patients with two mild or very mild beta+ thalassaemia alleles had mild to moderate disease. Although concurrent inheritance of extra alpha genes with heterozygous beta thalassaemia results in thalassaemia intermedia, the disease is ...Continue Reading

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