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. 1994 Oct 11;22(20):4139–4147. doi: 10.1093/nar/22.20.4139

Analysis of a 70 kb segment of DNA containing the human zeta and alpha-globin genes linked to their regulatory element (HS-40) in transgenic mice.

G Gourdon 1, J A Sharpe 1, D Wells 1, W G Wood 1, D R Higgs 1
PMCID: PMC331901  PMID: 7937139

Abstract

We have ligated two cosmids through an oligonucleotide linker to produce a single fragment spanning 70 kb of the human alpha-globin cluster, in which the alpha-like globin genes (zeta 2, alpha 2 and alpha 1), their regulatory element (HS-40) and erythroid-specific DNase I hypersensitive sites accurately retain their normal genomic organization. The zeta (embryonic) and alpha (embryonic, fetal and adult) globin genes were expressed in all 17 transgenic embryos. Similarly, all fetal and adult mice from seven transgenic lines that contained one or more copies of the fragment, produced up to 66% of the level of endogenous mouse alpha-globin mRNA. However, as for smaller constructs containing these elements, human alpha-globin expression was not copy number dependent and decreased by 1.5-9.0 fold during development. These findings suggest that either it is not possible to obtain full regulation of human alpha-globin expression in transgenic mice or, more likely, that additional alpha-globin regulatory elements lie beyond the 70 kb segment of DNA analysed.

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