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Methylated RNA Immunoprecipitation Assay to Study m5C Modification in Arabidopsis

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Published on: May 14, 2020

Methylome decoding of RdDM-mediated reprogramming effects in the Arabidopsis MSH1 system.

Hardik Kundariya¹, Robersy Sanchez¹, Xiaodong Yang^1,2

¹Department of Biology, The Pennsylvania State University, 362 Frear N Bldg, University Park, PA, 16802, USA.

|August 4, 2022

Summary

This summary is machine-generated.

Plants utilize RNA-directed DNA methylation (RdDM) for programmed chromatin changes. This study decodes intragenic methylation repatterning, revealing a methylome code for plant phenotype transitions.

Keywords:

DNA methylation Epigenetic Phenotypic plasticity Stress response Vigor sRNA

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Area of Science:

Plant biology
Epigenetics
Genomics

Background:

Plants exhibit programmed chromatin modifications in response to environmental cues, influencing heritable phenotypic plasticity.
The RNA-directed DNA methylation (RdDM) pathway is crucial for this epigenetic reprogramming.
Genome-wide understanding of epigenomic changes and gene networks, especially intragenic DNA methylation, remains challenging.

Purpose of the Study:

To investigate intragenic methylome repatterning within the MSH1 system during plant phenotype transitions.
To identify RdDM target loci and decode phenotype-relevant methylome data.
To uncover the methylome "code" governing de novo intragenic methylation.

Main Methods:

Analysis of intragenic methylome repatterning associated with distinct plant epigenetic states.
Identification of state-specific cytosine methylation changes in key gene networks.
Functional confirmation of RdDM targets using mutant datasets and small RNA cluster associations.

Main Results:

Identified state-specific cytosine methylation changes in 871 genes within growth-versus-stress, chromatin remodeling, and RNA spliceosome networks.
Confirmed over 77% of these genes and 81% of network hubs as RdDM targets.
Discovered RdDM-dependent methylation sites within identifiable sequence motifs, sensitive to DCL2/DCL3/DCL4.

Conclusions:

Biologically relevant DNA methylation variation includes intragenic, single-site cytosine changes, not just differentially methylated regions.
RdDM-mediated methylation within sequence motifs highlights gene hubs critical for stress response and growth vigor.
This research reveals components of a methylome code for targeted intragenic methylation repatterning during plant phenotype shifts.