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SPO11 dimers are sufficient to catalyse DNA double-strand breaks in vitro

Cédric Oger1, Corentin Claeys Bouuaert2

  • 1Louvain Institute of Biomolecular Science and Technology, Université Catholique de Louvain, Louvain-La-Neuve, Belgium.

Nature
|February 19, 2025
PubMed

Insights

Scientists reconstituted SPO11

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • SPO11 protein initiates meiotic recombination by creating programmed DNA double-strand breaks (DSBs).
  • The catalytic activity of SPO11 has not been previously reconstituted in vitro.
  • Understanding SPO11's function is crucial for comprehending meiotic recombination and genetic diversity.

Purpose of the Study:

  • To biochemically reconstitute the catalytic activity of SPO11 in vitro.
  • To elucidate the mechanism of SPO11-mediated DNA double-strand break formation.
  • To investigate the role of SPO11 partners in meiotic recombination.

Main Methods:

  • Biochemical reconstitution of SPO11 activity using Mus musculus SPO11.
  • Analysis of DNA substrate requirements (sequence, bendability, topology).
  • Investigation of SPO11 oligomerization state and requirement for dimerization in cleavage.

Main Results:

  • SPO11 catalyzes DNA break formation independently and remains attached to broken DNA strands.
  • SPO11 activity is influenced by DNA substrate properties and can reseal single-strand breaks.
  • SPO11 functions as a monomer but requires dimerization for catalytic activity; TOP6BL forms a complex with SPO11, enhancing DNA end binding.

Conclusions:

  • SPO11 dimerization is the core mechanism controlling meiotic DSB induction.
  • A model involving biomolecular condensates and SPO11-TOP6BL complex formation is proposed for in vivo DSB induction.
  • This study provides the first in vitro biochemical system for studying SPO11's catalytic activity.

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