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The predominant beta-thalassemia in Sardinia is the beta 0 type in which no beta-globin chains are synthesized in the homozygous state. We determined the beta-thalassemia mutations in this population by the oligonucleotide-probe method and defined the chromosome haplotypes on which the mutation resides. The same beta 39(CAG----TAG) nonsense mutation was found on nine different chromosome haplotypes. Although this mutation may have arisen more than once, the multiple haplotypes could also be generated by crossing over and gene conversion events. These findings underscore the frequency of mutational events in the beta-globin gene region.

The same beta-globin gene mutation is present on nine different beta-thalassemia chromosomes in a Sardinian population.