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Area of Science:

  • Molecular biology
  • Genetics
  • Biochemistry

Background:

  • The histone methyltransferase ASH1L is known to aid in DNA repair, specifically the removal of UV-induced cyclobutane pyrimidine dimers (CPDs).
  • CPD excision is more efficient at regulatory elements like enhancers compared to other genomic regions.

Purpose of the Study:

  • To investigate how ASH1L influences enhancer stability and DNA damage.
  • To understand ASH1L's role in protecting against CPD induction at enhancers.

Main Methods:

  • Analysis of DNA damage maps in ASH1L-proficient and ASH1L-deficient cells.
  • Molecular dynamics simulations to study ASH1L's DNA-binding interactions.
  • Comparison of CPD formation at different DNA sequences and genomic elements.

Main Results:

  • ASH1L protects enhancer sequences from UV-induced CPD formation, in addition to promoting repair.
  • ASH1L specifically reduces CPDs at C-containing dinucleotides, not TT sites, and does not affect other DNA lesions.
  • ASH1L's protective role is linked to H3K4me3 and H3K27ac marks and involves an AT hook that disfavors CPD formation.

Conclusions:

  • ASH1L acts as a guardian of regulatory elements, preventing CPD formation and associated mutations.
  • Loss of ASH1L function leads to increased C->T transitions at enhancers, particularly in skin cancers with ASH1L mutations.