Molecular and Cellular Biology, October 2001, p. 6507-6514, Vol. 21, No. 19
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.19.6507-6514.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
-Globin
Gene Cluster
Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, United Kingdom
Received 29 January 2001/Returned for modification 9 May 2001/Accepted 2 July 2001
Our previous studies on nascent transcription across the human
-globin gene cluster revealed the presence of intergenic transcripts in addition to the expected genic transcripts. We now show that transcription into the
-globin locus control region (LCR) begins within an ERV9 endogenous retroviral long terminal repeat upstream of
DNase I hypersensitive site 5. However, in a transgenic mouse, which
has the human
-globin LCR but lacks the ERV9 LTR, transcription begins upstream of the transgenic locus. We postulate that in this
transgenic mouse nearby endogenous mouse promoters are activated by the
LCR. Intergenic transcription is also detected across the whole
transgenic globin gene locus independently of the stage of erythroid
development. Intergenic transcription in the
-globin cluster is
erythroid specific; however, it can be induced in nonerythroid cells by
several means: by transinduction with a plasmid transcribing part of
the cluster, by exogenous addition of transcription factors, and by
treatment with the histone deacetylase inhibitor trichostatin A.
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