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The Human  Globin Locus Introduced by YAC Transfer Exhibits a Specific and Reproducible Pattern of Developmental Regulation in Transgenic Mice
Susanna Porcu,
Michael Kitamura,
Ewa Witkowska,
Zemin Zhang,
Annick Mutero,
Chin Lin,
Judy Chang, and
Karin M.L. Gaensler
From the Howard Hughes Medical Institute, San Francisco; Oakland Children's Hospital Research Institute, CA; and the Department of Medicine, University of California, San Francisco, CA.
The human  globin locus spans an 80-kb chromosomal region encompassing both the five expressed globin genes and the cis-acting elements that direct their stage-specific expression during ontogeny. Sequences proximal to the genes and in the locus control region, 60 kb upstream of the adult globin gene, are required for developmental regulation. Transgenic studies have shown that altering the structural organization of the locus disrupts the normal pattern of globin gene regulation. Procedures for introducing yeast artificial chromosomes (YACs) containing large genetic loci now make it possible to define the sequences required for stage-restricted gene expression in constructs that preserve the integrity of the globin locus. We demonstrate that independent YAC transgenic lines exhibit remarkably similar patterns of globin gene expression during development. The switch from  to globin predominant expression occurs between day 11.5 and 12.5 of gestation, with no more than twofold differences in human globin mRNA levels between lines. Human globin mRNA levels were twofold to fourfold lower than that of mouse maj, revealing potentially significant differences in the regulatory sequences of the two loci. These findings provide an important basis for studying regulatory elements within the globin locus.
Blood, Vol. 90 No. 11 (December 1), 1997:
pp. 4602-4609
© 1997 by The American Society of Hematology.
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