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• W2106823467 abstract "To investigate the effect of matrix attachment regions (MARs) on transgene expression levels and stability in cereal crops, we generated 83 independent transgenic rice callus lines containing a gusA expression cassette either as a simple expression unit, or flanked with MARs from tobacco (Rb7) or yeast (ARS1). Transgenic rice plants were regenerated from these callus lines and analysed at the structural and expression levels over two generations. In the first generation (T0), both Rb7 and ARS1 MARs significantly increased transgene expression levels. In the populations of plants containing MARs, we observed a significant reduction in the number of non-expressing lines compared to the population of plants without MARs. However, variation in β-glucuronidase (GUS) expression levels between independent lines was similar both in the presence and absence of flanking MARs. In the presence of MARs, GUS activity increased in proportion to transgene copy number up to 20 copies, but was generally reduced in lines carrying a higher copy number. In the population of plants without MARs, there was no correlation between expression level and transgene copy number. In the second generation (T1), transgene expression levels were significantly correlated with those of the T0 parents. The Rb7 MARs significantly improved the stability of transgene expression levels over two generations, and therefore appear to offer protection against transgene silencing. Our study shows that the exploitation of MARs may be an important strategy for stabilising transgene expression levels in genetically engineered cereals." @default.
• W2106823467 created "2016-06-24" @default.
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• W2106823467 date "1999-05-01" @default.
• W2106823467 modified "2023-09-27" @default.
• W2106823467 title "Matrix attachment regions increase transgene expression levels and stability in transgenic rice plants and their progeny" @default.
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• W2106823467 doi "https://doi.org/10.1046/j.1365-313x.1999.00446.x" @default.
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