Thalassaemia with normal levels of Hb A, and Hb F and with an α/β ratio higher than 1 is described in 4 families. 3 of these families show direct or indirect signs of the presence of the δ-thalassaemia gene along with the β-thalassaemia gene. The fourth family leaves the question as to whether there is a single mutation of the δβ tract or a β + δ-thalassaemia in coupling unanswered. The necessity of knowing of the existence of this thalassaemia which conceals the presence of a β-thalassaemia gene, is stressed, above all in view of the danger that mating between a carrier of this thalassaemia and a carrier of classical β-thalassaemia could result in the birth of children with Cooley’s disease.
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© 1978 S. Karger AG, Basel
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