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Telomere repeat-containing RNA (TERRA) interacts with lysine-specific demethylase 1A (LSD1) to promote the alternative lengthening of telomeres (ALT) pathway. LSD1-TERRA phase separation enhances R-loop formation and telomere maintenance in ALT.

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Telomere Biology

Background:

  • The alternative lengthening of telomeres (ALT) pathway is crucial for maintaining telomere length in a subset of cancers.
  • Telomere repeat-containing RNA (TERRA) plays a role in telomere maintenance, including R-loop formation.
  • Lysine-specific demethylase 1A (LSD1/KDM1A) is an epigenetic regulator with known roles in gene expression and cancer.

Purpose of the Study:

  • To investigate the interaction between TERRA and LSD1 in the ALT pathway.
  • To elucidate the mechanism by which LSD1 contributes to ALT.
  • To understand the role of phase separation in LSD1-TERRA complex formation and telomere function.

Main Methods:

  • Immunofluorescence to detect LSD1 localization at ALT telomeres.
  • RNA immunoprecipitation to assess TERRA-LSD1 interaction.
  • Biochemical assays to evaluate LSD1's demethylase activity and RNA-binding capabilities.
  • In vitro phase separation assays.
  • Analysis of R-loop formation and Rad51AP1 recruitment.

Main Results:

  • LSD1 localizes to ALT telomeres in a TERRA-dependent manner.
  • LSD1's function in ALT is primarily mediated by its RNA-binding domain, not its demethylase activity.
  • LSD1 and TERRA undergo liquid-phase separation, forming condensates at ALT telomeres.
  • These condensates recruit Rad51AP1 and enhance TERRA-containing R-loop formation.

Conclusions:

  • LSD1-TERRA phase separation is a key mechanism for ALT telomere maintenance.
  • The biophysical properties of LSD1-TERRA interactions influence chromatin function at telomeres.
  • This study reveals a novel role for LSD1 as an RNA-binding protein involved in telomere regulation through phase separation.