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http://dx.doi.org/10.14348/molcells.2021.0160

MET1-Dependent DNA Methylation Represses Light Signaling and Influences Plant Regeneration in Arabidopsis  

Shim, Sangrea (Department of Chemistry, Seoul National University)
Lee, Hong Gil (Plant Genomics and Breeding Institute, Seoul National University)
Seo, Pil Joon (Department of Chemistry, Seoul National University)
Publication Information
Molecules and Cells / v.44, no.10, 2021 , pp. 746-757 More about this Journal
Abstract
Plant somatic cells can be reprogrammed into a pluripotent cell mass, called callus, which can be subsequently used for de novo shoot regeneration through a two-step in vitro tissue culture method. MET1-dependent CG methylation has been implicated in plant regeneration in Arabidopsis, because the met1-3 mutant exhibits increased shoot regeneration compared with the wild-type. To understand the role of MET1 in de novo shoot regeneration, we compared the genome-wide DNA methylomes and transcriptomes of wildtype and met1-3 callus and leaf. The CG methylation patterns were largely unchanged during leaf-to-callus transition, suggesting that the altered regeneration phenotype of met1-3 was caused by the constitutively hypomethylated genes, independent of the tissue type. In particular, MET1-dependent CG methylation was observed at the blue light receptor genes, CRYPTOCHROME 1 (CRY1) and CRY2, which reduced their expression. Coexpression network analysis revealed that the CRY1 gene was closely linked to cytokinin signaling genes. Consistently, functional enrichment analysis of differentially expressed genes in met1-3 showed that gene ontology terms related to light and hormone signaling were overrepresented. Overall, our findings indicate that MET1-dependent repression of light and cytokinin signaling influences plant regeneration capacity and shoot identity establishment.
Keywords
Arabidopsis; callus; cryptochrome 1; cytokinin; DNA methylation; MET1; shoot regeneration;
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