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. 1994 Jul;14(7):4694–4703. doi: 10.1128/mcb.14.7.4694

Scaffold attachment regions stimulate HSP70.1 expression in mouse preimplantation embryos but not in differentiated tissues.

E M Thompson 1, E Christians 1, M G Stinnakre 1, J P Renard 1
PMCID: PMC358842  PMID: 8007971

Abstract

Eukaryotic interphase chromatin is thought to be organized into topologically discrete, independent domains acting as units upon which differential patterns of gene expression are established. Sequences which attach chromatin to in vitro preparations of a nucleoprotein matrix (scaffold attachment regions [SARs]) may act as domain boundaries, but their role remains poorly defined compared with those of other elements such as locus control regions. We have produced mice homozygous for a transgene which is transcribed as early as the activation of the embryonic genome at the two-cell stage and which is expressed ubiquitously in a number of differentiated tissues. Transgenic lines were generated in the presence or absence of flanking SAR sequences, creating an original model which enabled us to examine the effects of these elements at different developmental stages. In the preimplantation mouse embryo, flanking SARs stimulated transgene expression in a copy-dependent manner. In contrast, in the differentiated tissues of newborn and adult mice, no significant SAR-dependent increase in transgene expression was found, correlation with copy number was lost, and position effects were observed. These results suggest a limited capacity of SARs to act as insulating elements but are consistent with a proposed model of SAR-mediated chromatin opening and closing.

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Selected References

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