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Polyploidisation pleiotropically buffers ageing in hepatocytes.

Kelvin Yin1, Maren Büttner2, Ioannis K Deligiannis1

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|April 7, 2024
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Summary
This summary is machine-generated.

Polyploidy in mouse hepatocytes buffers against age-related decline by creating distinct cell states. Tetraploid cells with wild-type alleles help restore normal liver function during aging.

Keywords:
BaseScopeLiverageingepigenetic clockhaploinsufficiencypolyploidysingle-nucleus RNA-seq

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Area of Science:

  • Hepatocyte biology
  • Aging research
  • Genomics

Background:

  • Polyploidy in hepatocytes is a proposed mechanism to buffer against transcriptional dysregulation.
  • The role of polyploidy in modulating hepatocyte gene regulatory networks during aging requires further investigation.

Purpose of the Study:

  • To demonstrate the role of polyploidy in modulating gene regulatory networks in hepatocytes during aging.
  • To investigate ploidy dynamics during aging in murine livers with non-deleterious genetic perturbations.

Main Methods:

  • Single-nucleus RNA sequencing of hepatocyte nuclei across different ploidy levels from young and old wild-type mice.
  • Comparison of gene expression and regulatory networks with strains haploinsufficient for HNF4A, CEBPA, or CTCF.
  • Histological evaluation of liver sections and genomic allele composition analysis by BaseScope.

Main Results:

  • Aging in wild-type mice increases hepatocyte polyploidy and steatosis.
  • Haploinsufficiency for HNF4A or CEBPA enriches tetraploid hepatocytes, affecting regulatory networks and suppressing age-related steatosis.
  • Tetraploid hepatocytes in aging HNF4A-haploinsufficient mice select for wild-type alleles, restoring genetic perturbations.

Conclusions:

  • Polyploidization creates distinct hepatocyte cell states that buffer against age-related decline.
  • Polyploid conversion facilitates pleiotropic buffering via non-random allelic segregation to restore a wild-type genome.
  • Manipulation of ploidy dynamics may offer therapeutic interventions for age-related liver dysfunction.