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. 1986 Oct;5(10):2551–2557. doi: 10.1002/j.1460-2075.1986.tb04534.x

Beta zero thalassemia caused by a base substitution that creates an alternative splice acceptor site in an intron.

J E Metherall, F S Collins, J Pan, S M Weissman, B G Forget
PMCID: PMC1167152  PMID: 3780671

Abstract

A thalassemic beta-globin gene cloned from a haplotype I chromosome contains a T to G transversion at position 116 of IVS1 which results in the generation of an abnormal alternative acceptor splice site. Transient expression studies revealed a 4-fold decrease in the amount of RNA produced with greater than 99% of it being abnormally spliced despite preservation of the normal acceptor splice site at position 130. These results suggest that the mutation at IVS1 position 116 results in beta zero thalassemia. A closely related mutation at position 110 of IVS1 also generates a novel acceptor site and results in a similar decrease in total mRNA produced, but approximately 20% of the mRNA produced is normally spliced and thus the phenotype is that of beta + thalassemia. These observations suggest that short range position effects may play a dramatic role in the choice of potential splice acceptor sites. We demonstrate the presence of abnormally spliced mRNA in reticulocytes of affected individuals and show the mutation at IVS1 position 116 segregating from the mutation at IVS1 position 110 in a three generation pedigree. The mutation results in the creation of a MaeI restriction site, as do a number of other thalassemic mutations, and we demonstrate some difficulties that may arise in the differential diagnosis of these mutations.

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