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Cis-regulatory Sequences02:02

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Isolation and Transcriptome Analysis of Plant Cell Types
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Evolution of plant cell-type-specific cis-regulatory elements.

Haidong Yan, John P Mendieta, Xuan Zhang

    Biorxiv : the Preprint Server for Biology
    |January 23, 2024
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    Summary
    This summary is machine-generated.

    Understanding cis-regulatory element (CRE) evolution in plants is complex. This study reveals how chromatin accessibility varies across cell types and species, uncovering insights into regulatory element conservation and evolution.

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    Area of Science:

    • Plant genomics
    • Evolutionary biology
    • Gene regulation

    Background:

    • Cis-regulatory elements (CREs) are crucial for controlling gene expression.
    • The evolutionary dynamics of CREs, particularly in plants, are not well understood.
    • Chromatin accessibility plays a key role in defining active regulatory regions.

    Purpose of the Study:

    • To construct a comprehensive single-cell atlas of chromatin accessibility in rice (Oryza sativa).
    • To perform comparative genomics across multiple grass species to understand CRE evolution.
    • To investigate the relationship between chromatin accessibility, conservation, and cell-type specificity.

    Main Methods:

    • Single-cell assay for transposase-accessible chromatin using sequencing (scATAC-seq) on 103,911 rice nuclei.
    • Comparative genomics integrating data from rice and four other grass species (Zea mays, Sorghum bicolor, Panicum miliaceum, Urochloa fusca).
    • Analysis of accessible chromatin regions (ACRs) for conservation, cell-type specificity, and overlap with histone modifications (H3K27me3).

    Main Results:

    • Identified 126 discrete cell states across nine rice organs.
    • Found varying levels of ACR conservation correlated with cell-type specificity.
    • Epidermal ACRs showed lower conservation, suggesting rapid regulatory evolution in this layer.
    • Discovered conserved ACRs overlapping H3K27me3, potentially acting as silencer-like elements.

    Conclusions:

    • Comparative genomics reveals the dynamic evolution of plant cell-type-specific CREs.
    • Chromatin accessibility patterns provide insights into regulatory element conservation and divergence.
    • The study highlights potential mechanisms for regulatory evolution, including rapid changes in specific cell types and conserved silencing elements.