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Establishment of Transcriptional Gene Silencing Targeting the Promoter Regions of GFP, PDS, and PSY Genes in Cotton using Virus-Induced Gene Silencing. | LitMetric

AI Article Synopsis

Article Abstract

Virus-induced gene silencing (VIGS) by deploying viral-based vectors such as tobacco rattle virus (TRV) is a homology-based gene silencing technique in post-transcriptional gene silencing (PTGS) and transcriptional gene silencing (TGS) to validate the function of particular genes. The study presented here showed the induction of DNA methylation in the promoter regions of three phenotypic marker genes in different cotton accessions, including two endogenous genes such as phytoene desaturase (PDS) and phytoene synthase (PSY), and an exogenous gene, such as green fluorescent protein (GFP). First, DNA methylation was established in transgenic GFP cotton where methylation persisted up to S generation. Afterward, the promoter of PSY was targeted following the same conditions. Significant silencing of PSY was observed and methylation of the promoter was found up to S generation in red leaf cotton as detected in GFP cotton. Silencing of PDS resulted in a photobleaching phenotype; interestingly, the strength of this phenotype was diverse within the plants and was not observed in the next generation. Bisulfite sequencing results showed methylation percentage of the cytosine residues was high at CG and CHG sites of the targeted promoter sequences in the silenced plants. The findings of this paper suggest that TRV-based vector system can be used to monitor DNA methylation for both exogenous and endogenous gene levels in cotton and offer a very useful tool for plant epigenetic modification.

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http://dx.doi.org/10.1007/s12033-022-00610-0DOI Listing

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