Acta Médica Portuguesa (Nov 1999)

Base molecular de uma beta-talassémia de transmissão dominante.

  • P Faustino,
  • J Barbot,
  • J Gonçalves,
  • M J Peres,
  • J Lavinha

DOI
https://doi.org/10.20344/amp.2153
Journal volume & issue
Vol. 12, no. 7-11

Abstract

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In this study, we sought to clarity the molecular basis of a dominant inherited beta-thalassemia, found in heterozygosity in a northern Portuguese family with thalassemia intermedia. We characterized: i) the alpha-globin gene cluster structure; ii) the beta-globin gene cluster haplotype; and iii) the beta-thalassemia mutation. The alpha-globin gene cluster was structurally normal. The G-->T transversion at codon 121 of the beta-globin gene was found in the affected individuals in association with Orkin's haplotype V. This is an uncommon, though ubiquitous, mutation. Which has also been found, in association with different haplotypes, in several distant populations. It has only been observed in this three-generation family, in the Portuguese population. We suggest a mechanism to explain the genotype/phenotype correlation.