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Globin gene mapping of DNA from families with (A gamma delta beta) thalassaemia has revealed a previously unreported gene deletion responsible for this condition. The deletion removes the A gamma, delta and beta genes and while its 5' end is in a similar position to that described in a previous deletion of this type, the 3' ends of the two deletions are quite different. In addition we have observed further examples of two other previously described deletions which result in this disorder. Phenotypic comparisons of families with (A gamma delta beta) thalassaemia, in which the molecular basis has been defined, show a remarkable similarity among the four different deletion defects, with important implications with regard to the mechanism by which deletions allow the continued expression of gamma genes.

Type

Journal article

Journal

Br J Haematol

Volume

57

Pages

279 - 89