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- W2057100779 abstract "A 213 kb human beta-globin locus yeast artificial chromosome (beta-YAC) was modified by homologous recombination to delete 2.9 kb of cross-species conserved sequence similarity encompassing the LCR 5' hypersensitive site (HS) 4 (Delta5'HS4 beta-YAC). In three transgenic mouse lines, completion of the gamma- to beta-globin switch during definitive erythropoiesis was delayed relative to wild-type beta-YAC mice. In addition, quantitative per-copy human beta-like globin mRNA levels were similar to wild-type beta-YAC transgenic lines, although beta-globin gene expression was slightly decreased in the day 12 fetal liver of Delta5'HS4 beta-YAC mice. A 0.8 kb 5'HS1 fragment was similarly deleted in the YAC. Three Delta5'HS1 beta-YAC transgenic lines were established. epsilon-globin gene expression was markedly reduced, approximately 16 fold, during primitive erythropoiesis compared to wild-type beta-YAC mice, but gamma-globin expression levels were unaffected. However, during the fetal stage of definitive erythropoiesis, gamma-globin gene expression was decreased approximately 4 fold at day 12 and approximately 5 fold at day 14. Temporal developmental expression profiles of the beta-like globin genes were unaffected by deletion of 5'HS1. Decreased expression of the epsilon- and gamma-globin genes is the first phenotype ascribed to a 5'HS1 mutation in the human beta-globin locus, suggesting that this HS does indeed have a role in LCR function beyond simply a combined synergism with the other LCR HSs." @default.
- W2057100779 created "2016-06-24" @default.
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- W2057100779 date "2007-07-01" @default.
- W2057100779 modified "2023-10-15" @default.
- W2057100779 title "Deletion of the human β-globin LCR 5′HS4 or 5′HS1 differentially affects β-like globin gene expression in β-YAC transgenic mice" @default.
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- W2057100779 doi "https://doi.org/10.1016/j.bcmd.2007.02.006" @default.
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