DDM1 Shapes Transgenerational Epigenetic Inheritance of Diverse Chromatin States.

DDM1 coordinates transgenerational epigenetic inheritance of repressive chromatin states in reciprocal crosses of Arabidopsis thaliana ecotypes Col-0 and C24, shaping distinct inheritance patterns for H3K27me3, DNA methylation, and H3K4me3.

• Why it matters: Mechanisms that maintain and stabilize adaptive chromatin states during transgenerational epigenetic inheritance in plants are unclear, especially how different chromatin marks are reinforced across generations.
• What they did: Using reciprocal crosses between Col-0 and C24, the study tracked TEI of H3K27me3, DNA methylation, and the active mark H3K4me3, and tested how DDM1 modulates their inheritance patterns.
• The result: All three marks undergo TEI, but they show distinct inheritance patterns tied to their reinforcement mechanisms, and DDM1 coordinates propagation of repressive chromatin states, implying chromatin remodeling shapes TEI via nucleosome organization and histone variant dynamics.