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2004:
Torney François; Partier Anne; Says-Lesage Véronique; Nadaud Isabelle; Barret Pierre; Beckert Michel
Heritable transgene expression pattern imposed onto maize ubiquitin promoter by maize adh-1 matrix attachment regions: tissue and developmental specificity in maize transgenic plants.
Plant cell reports 2004;
22(
12):.
Matrix attachment regions (MARs) have been used to enhance transgene expression and to reduce transgene expression instability in various organisms. In plants, contradictory data question the role of MAR sequences. To assess the use of MAR sequences in maize, we have used two well-characterized MARs from the maize adh-1 region. The MARs have been cloned either 5' to or at both sides of a reporter gene expression cassette to reconstitute a MAR-based domain. Histochemical staining revealed a new transgene expression pattern in roots of regenerated plants and their progeny. Furthermore, MARs systematically induced variegation. We show here that maize adh-1 MARs are able to modify transgene expression patterns as a heritable trait, giving a new and complementary outcome following use of MARs in genetic transformation.
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