Abstract
We have determined the DNA sequence of a 1464 bp segment immediately flanking the 5' side of the human beta-globin gene. The sequence shows little similarity to the corresponding regions of the epsilon- or gamma-globin genes. There is about 75% homology, however, between the 5' extragenic regions of the beta-globin genes of man, goat and rabbit respectively. The mouse beta minor globin gene, but not the mouse beta major globin gene, also shares this extensive homology. A short segment of simple sequence DNA is found from about 1418 to 1388 bp upstream from the human beta-globin gene which consists of repeats of the sequence (TTTTA). Similar DNA sequences are also found at several sites in the large intron of the beta-globin gene. We have compared the DNA sequence of the 5' extragenic region of the normal beta-globin gene with the same segment of the beta-globin gene of a patient with beta thalassaemia. Of the two nucleotide differences observed, one generates a polymorphic HinfI site present 990 bp upstream from the beta-globin gene in the thalassaemic beta-globin and absent in the normal gene. A second beta thalassemic beta-globin gene which has the same molecular defect as the above mentioned case, however, lacks this HinfI site. It is therefore not yet clear whether this HinfI site will have any value in prenatal diagnosis of beta thalassaemia.
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Selected References
These references are in PubMed. This may not be the complete list of references from this article.
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