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UNCLASSIFIED TYPE OF CONGENITAL DYSERYTHROPOIETIC ANAEMIA (CDA) WITH PROMINENT PERIPHERAL ERYTHROBLASTOSIS

We have arialysed DNA from 140 unrelated British individuals and 110 unrelated Icelanders (Table I). None of these 500 chromosomes had an c( thalassaemia deletion, although three cases of the uncommon triplicated M gene arrangement were found in the British individuals. Hence, a chromosomes, if present in these populations, must be rare ( x < 0.01,990/, confidence limit). Iceland has probably always been completely free of any form of malaria and a mild form of malaria, probably P. vivax, has been present only episodically in parts of Britain (Bruce-Chwatt, 1980; Dobson, 1980). These macroepidemiological data are consistent with recent microepidemiological studies (Oppenheimer et al, 1984) which also support a role for malaria in producing the remarkably high prevalence of M thalassaemia found in some tropical areas. We are grateful to Dr Olafar Jensson (Blodbankinn, Reykjavik) and Professor J. H. Edwards for making available to us the samples from Iceland.