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A gene deletion ending at the midpoint of a repetitive DNA sequence in one form of hereditary persistence of fetal haemoglobin

Nature volume 296, pages 469470 (01 April 1982) | Download Citation

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Abstract

The form of hereditary persistence of fetal haemoglobin (HPFH) that commonly occurs in black populations is an inherited disorder of haemoglobin synthesis characterized by a uniformly high level of fetal haemoglobin (HbF) synthesis in all the erythroid cells of affected adult individuals1,2. The precise molecular basis of the HPFH phenotype remains unknown, but is of great interest because of the knowledge that could be gained, through its understanding, of the mechanisms that regulate the expression of globin genes during development. The most common form of HPFH in black populations is associated with an extensive deletion that includes the normal adult (δ and β) globin genes and adjacent flanking DNA3–8. To investigate this disorder in more detail, we have cloned the DNA encompassing the region of the gene deletion in a case of HPFH and have determined the nucleotide sequence across the 5′ end point of the deletion within the non-α-globin gene complex. We report here that this end point maps at the midpoint of a member of the ‘AluI’ family of repetitive sequences located approximately 4 kilobases (kb) to the 5′ side of the δ-globin gene. Such repetitive sequences may be ‘hot spots’ of recombination, and are possibly involved in regulating gene expression.

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Author information

Author notes

    • D. Tuan

    Present address: Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Affiliations

  1. Departments of Human Genetics and Medicine, Yale University School of Medicine, 333 Cedar Street, New Haven, Connecticut 06510, USA

    • P. Jagadeeswaran
    • , D. Tuan
    • , B. G. Forget
    •  & S. M. Weissman

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DOI

https://doi.org/10.1038/296469a0

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