Dissection of the Ability of the Chicken Lysozyme Gene 5‘ Matrix Attachment Region To Stimulate Transgene Expression and To Dampen Position Effects

The chicken lysozyme gene domain is flanked by nuclear matrix attachment regions (MARs) on each side. We have previously shown that bilaterally flanking 5‘ MARs in stably transfected artificial genetic units enhance expression of a reporter transgene and dampen position effects of the chromatin stru...

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Bibliographic Details
Published in:Biochemistry (Easton) 1996-08, Vol.35 (33), p.10735-10742
Main Authors: Phi-Van, Loc, Strätling, Wolf H
Format: Article
Language:English
Subjects:
3T3 Cells
Animals
Blotting, Southern
Chickens
Chloramphenicol O-Acetyltransferase - genetics
DNA, Recombinant
Enhancer Elements, Genetic
Gene Expression Regulation, Enzymologic
Mice
Molecular Sequence Data
Muramidase - genetics
Transfection
Transgenes
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Summary:The chicken lysozyme gene domain is flanked by nuclear matrix attachment regions (MARs) on each side. We have previously shown that bilaterally flanking 5‘ MARs in stably transfected artificial genetic units enhance expression of a reporter transgene and dampen position effects of the chromatin structure at the site of integration. The 5‘ MAR was now dissected into smaller fragments that were monitored for effects on transgene expression in mouse 3T3 cells by a similar assay. Fragments, which contain 1.32 and 1.45 kb and represent the upstream and the downstream half, respectively, of the 5‘ MAR, retained the ability to stimulate transgene expression as well as the ability to reduce the variation in the level of expression. However, a 452 bp subfragment (H1-HaeII), which still exhibits specific binding to nuclear matrices and contains two high-affinity binding sites for the abundant nuclear matrix protein ARBP, lost both of those abilities. A dimerized 177 bp sequence from fragment H1-HaeII, which also binds selectively to nuclear matrices and includes a duplicated ARBP binding site, was also unable to stimulate reporter gene expression. Furthermore, a 0.65 kb subfragment containing an intrinsically bent sequence did not affect an elevated reporter gene expression and its dampening. Our results show that the ability of MAR fragments to bind to nuclear matrices is not sufficient to enhance and insulate transgene expression in stably transfected cells.
ISSN:0006-2960
1520-4995
DOI:10.1021/bi9603783