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Lysine-specific demethylase 1 (LSD1) unexpectedly promotes DNA replication origin firing in euchromatin. LSD1 deficiency causes a genome-wide switch of replication timing from early to late, revealing its epigenetic role in DNA replication.

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Cell Cycle Regulation

Background:

  • DNA replication initiates from specific origins, typically in open chromatin.
  • The precise epigenetic mechanisms controlling replication origin selection and activation are not fully understood.
  • Lysine-specific demethylase 1 (LSD1) is known to promote chromatin condensation via H3K4me1/2 demethylation.

Purpose of the Study:

  • To investigate the role of LSD1 in DNA replication and origin firing.
  • To elucidate the mechanism by which LSD1 influences replication timing.
  • To understand the implications of LSD1's role in replication for epigenetic regulation and cancer therapy.

Main Methods:

  • Co-immunoprecipitation to detect LSD1 interaction with replication machinery.
  • Cellular fractionation and western blotting to assess LSD1 levels during S phase.
  • Chromatin immunoprecipitation followed by sequencing (ChIP-seq) to identify pre-replicative complex (pre-RC) binding sites.
  • Analysis of DNA replication timing using genome-wide assays in LSD1-deficient cells.
  • Investigating the recruitment of TICRR and CDC45 to replication origins.

Main Results:

  • LSD1 interacts with the DNA replication machinery and peaks in early S phase.
  • LSD1 facilitates origin firing in euchromatic regions enriched with H3K4me2.
  • LSD1 deficiency causes a genome-wide shift in DNA replication from early to late S phase.
  • LSD1's function in origin firing involves the loading of TICRR and recruitment of CDC45 to the pre-RC.
  • These findings reveal an unexpected role for LSD1 in regulating replication timing through epigenetic mechanisms.

Conclusions:

  • LSD1 plays a critical, previously unrecognized role in activating euchromatic replication origins.
  • Epigenetic regulation by LSD1 is crucial for determining DNA replication timing.
  • Understanding LSD1's role in replication is important for managing side effects of anti-LSD1 cancer therapies.