Decoding the tissue-specific regulatory roles of H2A.Z in maize leaf and endosperm.

H2A.Z deposition around genes in maize leaf and endosperm is linked to tissue-specific expression, with higher leaf promoter-associated H2A.Z correlating with higher leaf expression and photosynthetic activity.

• Why it matters: H2A.Z is a key transcription regulator, but its tissue-specific roles in maize are unclear, limiting understanding of how epigenetic marks shape gene regulation and development.
• What they did: The study mapped genome-wide H2A.Z distribution in maize leaf and endosperm, then related peak locations to non-coding and protein-coding transcripts and to gene expression patterns across tissues.
• The result: Leaf-biased promoter H2A.Z is enriched for photosynthetic activity and predicts higher expression in leaf; consistent with this, H2A.Z overexpression lines show a higher net photosynthetic rate.

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