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Genome Restructuring around Innate Immune Genes in Monocytes in Alcohol-associated Hepatitis.

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    Chromatin structure changes in monocytes from alcohol-associated hepatitis (AH) patients alter the expression of clustered immune genes. These 3D genome alterations in AH monocytes impact inflammatory responses and disease severity.

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    Area of Science:

    • Genomics
    • Immunology
    • Molecular Biology

    Background:

    • Inflammatory genes are often clustered in the genome, and their 3D architecture is crucial for regulation.
    • Alcohol-associated hepatitis (AH) involves hyper-responsive monocytes contributing to severe inflammation.
    • Understanding genome structure alterations in AH is key to addressing disease pathogenesis.

    Purpose of the Study:

    • To investigate alterations in 3D genome architecture in monocytes from AH patients compared to healthy controls.
    • To identify specific genomic regions and immune genes affected by structural changes in AH.
    • To correlate chromatin conformation changes with gene expression in AH monocytes.

    Main Methods:

    • High-throughput chromatin conformation capture (Hi-C) was performed on monocytes from 4 AH patients and 4 healthy controls.
    • Genomic contact frequencies were compared between AH and healthy control (HC) groups.
    • Results were integrated with scRNA-seq data from LPS-challenged AH patients.

    Main Results:

    • Significant dissimilarities in chromosome structure were observed between AH and HC monocytes.
    • Numerous genomic regions showed altered contact frequencies in AH, with specific hotspots identified.
    • Hotspots included genes involved in innate immunity, such as the NK-gene receptor complex and CXC-chemokines.

    Conclusions:

    • Monocytes from AH patients exhibit altered chromatin structure.
    • These structural changes impact the transcriptional regulation of clustered proinflammatory genes.
    • The findings provide insights into the molecular mechanisms underlying inflammation in alcohol-associated hepatitis.