Abstract
We have studied the transfer of human and murine globin gene sequences into fertilized mouse oocytes by microinjection. Germline transmission was demonstrated for the human delta- and beta-globin genes contained in the bacteriophage lambda H beta G1. Expression of these human globin-gene sequences was not detectable in either erythroid or nonerythroid tissues. A recombinant plasmid containing the murine beta maj promoter region coupled to the prokaryotic coding sequence for galactokinase was also successfully transferred to two mice, and stable germline transmission of integrated DNA was demonstrated for at least 3 generations. Despite the presence of a murine globin-promoter sequence, expression of the mouse beta maj galactokinase fusion gene was not observed in primary or secondary animals in erythroid or nonerythroid tissues. Analysis of primary and secondary animals from both series of injections revealed extensive de novo methylation in the integrated microinjected DNA. Administration of 5-azacytidine to mice containing the mouse beta maj-promoted galactokinase gene resulted in partial hypomethylation was associated with an apparent two- to threefold increase in galactokinase (gal K) gene expression.
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