Chromatin-Assisted Targeting Enables Precise DNA Methylation Editing in Plants
Precise installation of DNA methylation at selected loci offers a powerful strategy for regulating gene expression without altering DNA sequence, but existing plant epigenome editors are constrained by limited efficiency, locus dependence, and genome-wide off-target methylation. Here, we developed SunTag-MQ1v variants incorporating TRBIP1, which promotes removal of the antagonistic H3K4me3 mark,…
A recent development in plant epigenome editing has enabled precise installation of DNA methylation at targeted sites, without disrupting the genetic code. Existing plant epigenome editors have faced challenges such as low efficiency, specificity issues, and unwanted off-target methylation across the genome.
Researchers have now developed SunTag-MQ1v variants with the addition of TRBIP1 and CHLAMY. TRBIP1 is a protein that promotes the removal of the H3K4me3 mark, which can interfere with methylation. CHLAMY is an oligomerizing protein originating from Chlamydomonas reinhardtii.
By incorporating TRBIP1 and CHLAMY into SunTag-MQ1v, the researchers created SunTag-NOVA. This combination overcame the lethality and widespread off-target effects observed with direct TRBIP1-MQ1v fusions. The addition of CHLAMY led to enhanced higher-order oligomerization of the editing complex, which improved target specificity and reduced off-target methylation accumulation.
Experiments demonstrated that SunTag-NOVA effectively installed DNA methylation and silenced transcription at the endogenous FWA, FT, and TMM genes in Arabidopsis with minimal off-target consequences. The findings indicate that integrating local chromatin modifications with controlled effector assembly can enhance targeted DNA methylation in plants, establishing SunTag-NOVA as a precise epigenome-editing platform for plant research.
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