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Mol. Cell. Biol., Jun 1996, 2906-2912, Vol 16, No. 6
BA Hug, RL Wesselschmidt, S Fiering, MA Bender, E Epner, M Groudine and TJ Ley
To examine the function of murine beta-globin locus region (LCR) 5'
hypersensitive site 3 (HS3) in its native chromosomal context, we deleted
this site from the mouse germ line by using homologous recombination
techniques. Previous experiments with human 5' HS3 in transgenic models
suggested that this site independently contains at least 50% of total LCR
activity and that it interacts preferentially with the human gamma-globin
genes in embryonic erythroid cells. However, in this study, we demonstrate
that deletion of murine 5' HS3 reduces expression of the linked embryonic
epsilon y- and beta H 1- globin genes only minimally in yolk sac-derived
erythroid cells and reduces output of the linked adult beta (beta major
plus beta minor) globin genes by approximately 30% in adult erythrocytes.
When the selectable marker PGK-neo cassette was left within the HS3 region
of the LCR, a much more severe phenotype was observed at all developmental
stages, suggesting that PGK-neo interferes with LCR activity when it is
retained within the LCR. Collectively, these results suggest that murine 5'
HS3 is not required for globin gene switching; importantly, however, it is
required for approximately 30% of the total LCR activity associated with
adult beta-globin gene expression in adult erythrocytes.
Copyright © 1996, American Society for Microbiology
Analysis of mice containing a targeted deletion of beta-globin locus control region 5' hypersensitive site 3
Department of Internal Medicine, Washington University Medical School, St. Louis, Missouri 63110, USA.
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