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• W2625853009 abstract "This study investigated sequence specificity and perenniality of DNA methylation in the cauliflower mosaic virus (CaMV) 35S promoter of transgenic gentian (Gentiana triflora × G. scabra) plants. Unlike conventional transgene silencing models, 35S promoter hypermethylation in gentian is species-specific and occurs irrespective of the T-DNA copy number and genomic location. Modified 35S promoters were introduced into gentian, and single-copy transgenic lines were selected for methylation analysis. Modified 35S promoter lacking a core (− 90) region [35S(Δcore)] in gentian conferred hypermethylation and high levels of de novo methylation of the CpHpH/CpCpG sites in the 35S enhancer regions (− 298 to − 241 and − 148 to − 85). Therefore, promoter transcription may not be an absolute requirement for the methylation machinery. In vitro, de novo methylation persisted for more than eight years. In another modified 35S promoter, two “GAAGA” motifs (− 268 to − 264 and − 135 to − 131) were replaced by “GTTCA” in the two highly de novo methylated regions. It did not support hypermethylation and showed transgene expression. A 64-bp fragment of the 35S enhancer region (− 148 to − 85) was introduced into gentian and the resultant transgenic lines analyzed. The 64-bp region exhibited hypermethylation at the CpG/CpWpG sites, but the CpHpH/CpCpG methylation frequency was lower than those of the unmodified 35S- and 35S(Δcore) promoters. Nevertheless, a distinct CpHpH/CpCpG methylation peak was found in the 64-bp region of all single-copy transgenic lines. These results suggest that the 64-bp region may contain an element required for 35S methylation but insufficient for high de novo methylation compared with those in the unmodified 35S and 35S(Δcore) promoters." @default.
• W2625853009 created "2017-06-23" @default.
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• W2625853009 date "2017-08-01" @default.
• W2625853009 modified "2023-09-27" @default.
• W2625853009 title "A 64-bp sequence containing the GAAGA motif is essential for CaMV-35S promoter methylation in gentian" @default.
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• W2625853009 doi "https://doi.org/10.1016/j.bbagrm.2017.06.001" @default.
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