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J. Biol. Chem., Vol. 275, Issue 41, 31567-31572, October 13, 2000
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From the Two distal enhancers that specify apolipoprotein
(apo) E gene expression in isolated macrophages and adipose tissue were
identified in transgenic mice that were generated with constructs of
the human apoE/C-I/C-I'/C-IV/C-II gene cluster. One of these enhancers, multienhancer 1, consists of a 620-nucleotide sequence located 3.3 kilobases (kb) downstream of the apoE gene. The second enhancer, multienhancer 2, is a 619-nucleotide sequence located 15.9 kb downstream of the apoE gene and 5.9 kb downstream of the apoC-I gene.
The two enhancers are 95% identical in sequence, and they are likely
to have arisen as a consequence of the gene duplication event that
yielded the apoC-I gene and the apoC-I' pseudogene. Both enhancer
sequences appear to have equivalent activity in directing apoE gene
expression in peritoneal macrophages and in adipocytes, suggesting that
their activity in specific cell types may be determined by common
regulatory elements.
Duplicated Downstream Enhancers Control Expression of the Human
Apolipoprotein E Gene in Macrophages and Adipose Tissue*
§¶,
§
,
§,
,
**, and
§
§§
Gladstone Institute of Cardiovascular
Disease, San Francisco, California 94141-9100 and the
§ Cardiovascular Research Institute and the

Department of Physiology, University of
California, San Francisco, California 94143
*
This work was supported in part by National Institutes of
Health Grant HL37063 (to J. M. T.).The costs of publication of this article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
Current address: Dept. of Medicine (DO6), University of
Sydney, Sydney, New South Wales 2006, Australia.
**
Current address: Dept. of Pharmacology, National University of
Ireland, Galway, Ireland.
§§
To whom correspondence should be addressed: The J. David
Gladstone Institutes, P. O. Box 419100, San Francisco, CA
94141-9100. Tel.: 415-826-7500; Fax: 415-285-5632; E-mail:
jtaylor@gladstone.ucsf.edu.
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