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. 1983 Mar;80(5):1184–1188. doi: 10.1073/pnas.80.5.1184

Abnormal splice in a mutant human beta-globin gene not at the site of a mutation.

C Dobkin, R G Pergolizzi, P Bahre, A Bank
PMCID: PMC393558  PMID: 6298782

Abstract

We have studied the expression of a cloned mutant human beta-globin gene in tissue culture cells. The gene, which was previously isolated from the chromosomal DNA of an individual with a low level of normal beta-globin expression (beta+-thalassemia), contains five mutations inside the large intervening sequence (IVS2), as well as a silent change in codon 2. This beta-thalassemia gene (thal) was inserted into a plasmid that is replicated and transcribed in a line of monkey kidney cells in culture. S1 nuclease mapping of the beta-globin RNA transcribed from this gene indicates that some of the beta-globin RNA is spliced abnormally by using a cryptic 3' splice sequence normally present in IVS2 but not used in processing the normal beta-globin transcript. The cryptic 3' splice site is not the site of a mutation in the thal gene. Because neither the 5' or 3' splice junction nor the cryptic site is mutated in this gene, it is most likely that the mutation at position 705 of IVS2, the only nonpolymorphic change in the gene, interferes indirectly with normal processing. These results suggest that certain sequences within IVS must be conserved to prevent abnormal splicing and loss of gene function.

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Selected References

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