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C3H mice exhibit higher Intracisternal A particle (IAP) retroviral activity due to reduced epigenetic repression and a potentially active "master copy." This explains their increased susceptibility to IAP-driven mutations.

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Area of Science:

  • Genetics
  • Epigenetics
  • Molecular Biology

Background:

  • Endogenous retroviruses (ERVs), particularly Intracisternal A particles (IAPs), are a significant source of mutations in mice.
  • Susceptibility to IAP insertions varies considerably among mouse strains, with C3H mice showing notable susceptibility.

Purpose of the Study:

  • To investigate the mechanisms underlying the high IAP activity and mutagenic insertion rates observed in C3H mice.
  • To identify specific IAP elements and epigenetic factors contributing to strain-specific retroviral activity.

Main Methods:

  • Comparative analysis of IAP insertion polymorphisms and transcript levels in embryonic stem (ES) cells from different mouse strains.
  • Identification and epigenetic characterization (DNA methylation, H3K4me3 enrichment) of IAP copies in C3H/HeJ ES cells.
  • Analysis of IAP subfamily distribution and potential functional elements.

Main Results:

  • C3H/HeJ mice show faster accumulation of strain-specific IAP insertions and higher IAP transcript levels in ES cells compared to other strains.
  • Identified 61 IAP copies in C3H/HeJ ES cells, all unmethylated and enriched with the active promoter mark H3K4me3.
  • A specific non-autonomous 1Δ1 IAP subfamily, responsible for most C3H insertions, includes a full-length potentially active 'master copy' whose LTR is methylated in 129 ES cells.

Conclusions:

  • The heightened IAP activity in C3H mice is likely attributed to a combination of reduced epigenetic repression (unmethylated IAPs) and the presence of an active 'master copy'.
  • Epigenetic regulation of IAP elements, particularly the methylation status of long terminal repeats (LTRs), plays a crucial role in controlling retroviral activity and insertional mutagenesis in a strain-specific manner.