Epigenetic silencing of a bialaphos resistance (bar) gene in R1 progeny of a transgenic rice line was found to be meiotically stable since selfed (R2) progeny were also susceptible and the bar locus highly methylated. A high proportion of R2 seedlings germinated in the presence of 5-azacytidine (AzaC) were herbicide-resistant and also contained at least one unmethylated copy of the bar gene, further establishing the relationship between silencing and methylation. Restored bar gene expression was typically maintained for 20–50 days, but eventual methylation and silencing of the bar locus underscores the ability of the recipient genome to recognize and inactivate intrusive DNA.
Plant Molecular Biology – Springer Journals
Published: Oct 6, 2004
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