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Parent-of-Origin DNA Methylation Dynamics during Mouse Development.

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Genomic imprints, crucial for development, are not always stable. This study reveals dynamic DNA methylation changes in imprinted regions, even in adult animals, suggesting functional importance.

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Area of Science:

  • Epigenetics
  • Genomics
  • Developmental Biology

Background:

  • Parent-specific differentially methylated regions (DMRs) regulate imprinted gene expression.
  • Faithful maintenance of genomic imprints is essential for development.

Purpose of the Study:

  • To investigate the stability of genomic imprints at the Dlk1-Dio3 intergenic DMR (IG-DMR).
  • To assess parental allele methylation dynamics at single-cell resolution throughout development and in adults.

Main Methods:

  • Utilized a reporter for genomic methylation targeted to the imprinted Dlk1-Dio3 IG-DMR.
  • Analyzed methylation status of both parental alleles at single-cell resolution in mouse embryonic stem cells, embryos, and postnatal animals.

Main Results:

  • Observed biallelic gain or loss of IG-DMR methylation in a small fraction of mouse embryonic stem cells, impacting developmental potency.
  • Detected striking parent-specific methylation changes with tissue- and cell-type-dependent signatures in embryos and postnatal mice.
  • Found persistent DNA methylation dynamics during adult neurogenesis, leading to inter-individual diversity.

Conclusions:

  • Genomic imprints are not entirely static and can undergo dynamic changes.
  • Significant cell-cell DNA methylation heterogeneity exists in adult animals.
  • Dynamic DNA methylation variations in adults may hold functional significance for neurogenesis and development.