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Mouse HP1γ regulates TRF1 expression and telomere stability.

Emmanouil Stylianakis1, Jackson Ping Kei Chan2, Pui Pik Law2

  • 1Telomere Replication & Stability group, Medical Research Council London Institute of Medical Sciences, London, United Kingdom; Institute of Clinical Sciences, Faculty of Medicine, Imperial College London, London, United Kingdom; Gene Control Mechanisms and Disease Group, Faculty of Medicine, Department of Brain Sciences, Imperial College London, London, United Kingdom.

Life Sciences
|August 20, 2023
PubMed
Summary
This summary is machine-generated.

Mouse HP1γ regulates telomere factor transcription, impacting telomere stability. Loss of HP1γ causes DNA damage and telomere dysfunction, particularly in females.

Keywords:
ChromatinDNA damageEpigeneticsHP1TERRATelomere

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Area of Science:

  • Epigenetics and Molecular Biology
  • Telomere Biology
  • Non-coding RNA Function

Background:

  • Telomeric repeat-containing RNAs (TERRAs) are long non-coding RNAs crucial for telomere heterochromatin formation and HP1 protein binding.
  • HP1γ, a member of the heterochromatin protein 1 family, is known to influence chromatin compaction and gene silencing.
  • The specific role of HP1γ in telomere maintenance and its transcriptional regulation of telomere factors remained unclear.

Purpose of the Study:

  • To investigate the effect of mouse HP1γ on the transcription of telomere factors and molecules involved in telomere maintenance.
  • To elucidate the role of HP1γ in telomere cohesion and stability.

Main Methods:

  • Utilized HP1γ-deficient mouse embryonic fibroblasts (MEFs) to study telomere function.
  • Employed gene expression analysis, telomere Fluorescence In Situ Hybridization (FISH), immunofluorescence, RT-qPCR, and DNA-RNA immunoprecipitation (DRIP) to validate findings.

Main Results:

  • Loss of HP1γ resulted in downregulation of telomere-associated transcripts, including the shelterin protein TRF1.
  • HP1γ deficiency led to increased telomere replication stress and DNA damage (γH2AX), with more pronounced effects in female mice.
  • Impaired telomere maintenance was linked to increased telomeric DNA-RNA hybrids and TERRAs originating from specific mouse chromosomes.

Conclusions:

  • Mouse HP1γ plays a significant role in the transcriptional regulation of telomere factors, including TRF1 and TERRAs.
  • HP1γ is essential for maintaining telomere stability, and its absence leads to profound consequences.
  • The study suggests a potential sexually dimorphic role for HP1γ in telomere regulation.