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Genetically Informed Single-Cell Analysis Reveals PLXND1 as a Cell-Type-Specific Molecular Switch in MASLD.

Xianyi Ma1, Junbo Song1, Xin Hong1

  • 1Department of Hepatobiliary Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China.

Metabolites
|June 25, 2026
PubMed
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This summary is machine-generated.

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PLXND1 acts as a cell-specific driver in metabolic dysfunction-associated steatotic liver disease (MASLD). Its role varies by immune cell type, impacting MASLD risk and offering precision therapy targets.

Area of Science:

  • Genetics and Genomics
  • Immunology
  • Metabolic Diseases

Background:

  • Metabolic dysfunction-associated steatotic liver disease (MASLD) is a complex systemic disorder influenced by genetics, epigenetics, metabolism, and immune responses.
  • Current understanding of MASLD's multi-omic causal architecture at the cellular level is limited, hindering targeted therapeutic development.

Purpose of the Study:

  • To establish an integrated framework connecting genetic factors to cell-type-specific liver dysfunction in MASLD.
  • To identify specific genes and cellular mechanisms driving MASLD pathogenesis using multi-omic and single-cell analyses.

Main Methods:

  • Utilized multi-layered Mendelian randomization (MR) and summary-data-based MR (SMR) to identify causal genes.
  • Employed single-cell eQTL-based MR across 14 immune cell lineages and validated findings with human hepatic single-cell RNA-sequencing.
Keywords:
MASLDMendelian randomizationPLXND1genetic causalitylipid-associated macrophagesprecision medicinesingle-cell transcriptomics

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  • Conducted two-step mediation MR for epigenetic and metabolic mechanisms and used a high-fat diet (HFD) murine model for validation.

    • Main Results:

    • Nominated PLXND1 as a key causal driver of MASLD.
    • Revealed a dichotomy in PLXND1's effect: decreased MASLD risk when upregulated in CD8+ effector memory T-cells, but increased risk in NK cells, monocytes, and dendritic cells.
    • Confirmed PLXND1's association with anti-fibrotic CD8+ T-cells and pro-inflammatory macrophages, identified protective DNA methylation mediators, and linked PLXND1 to six circulating metabolites.

    Conclusions:

    • PLXND1 acts as a lineage-dependent molecular switch in MASLD, with its function validated across genetic, epigenetic, metabolic, and single-cell data.
    • Findings suggest caution against systemic PLXND1 blockade, advocating for precision therapies targeting specific hepatic innate immune cells.
    • This study provides a cellular resolution framework for understanding MASLD causality and developing targeted interventions.