Abstract:
:Mammalian beta-globin loci contain multiple genes that are activated at different developmental stages. Studies have suggested that the transcription of one gene in a locus can influence the expression of the other locus genes. The prevalent model to explain this transcriptional interference is that all potentially active genes compete for locus control region (LCR) activity. To investigate the influence of transcription by the murine embryonic genes on transcription of the other beta-like genes, we generated mice with deletions of the promoter regions of Ey and betah1 and measured transcription of the remaining genes. Deletion of the Ey and betah1 promoters increased transcription of betamajor and betaminor 2-fold to 3-fold during primitive erythropoiesis. Deletion of Ey did not affect betah1 nor did deletion of betah1 affect Ey, but Ey deletion uniquely activated transcription from betah0, a beta-like globin gene immediately downstream of Ey. Protein analysis showed that betah0 encodes a translatable beta-like globin protein that can pair with alpha globin. The lack of transcriptional interference between Ey and betah1 and the gene-specific repression of betah0 did not support LCR competition among the embryonic genes and suggested that direct transcriptional interference from Ey suppressed betah0.
journal_name
Bloodjournal_title
Bloodauthors
Hu X,Eszterhas S,Pallazzi N,Bouhassira EE,Fields J,Tanabe O,Gerber SA,Bulger M,Engel JD,Groudine M,Fiering Sdoi
10.1182/blood-2006-06-029868subject
Has Abstractpub_date
2007-03-01 00:00:00pages
2210-6issue
5eissn
0006-4971issn
1528-0020pii
blood-2006-06-029868journal_volume
109pub_type
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