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SPINDOC binds PARP1 to facilitate PARylation.

Fen Yang1,2, Jianji Chen1,3, Bin Liu1

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SPINDOC protein regulates DNA damage response by interacting with PARP1. SPINDOC knockout mice show reduced PARylation and increased sensitivity to DNA damage, highlighting its role beyond SPIN1 interaction.

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Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Genetics

Background:

  • SPINDOC is known to associate with SPIN1, a histone H3K4me3 effector.
  • Understanding SPINDOC's broader biological functions requires identifying its interacting partners.

Purpose of the Study:

  • To investigate the protein interactions of SPINDOC.
  • To elucidate the role of SPINDOC in DNA damage response and PARP1 regulation.

Main Methods:

  • Co-immunoprecipitation to identify SPINDOC interacting proteins.
  • Analysis of SPINDOC knockout cells and mice.
  • Assessment of PARylation levels and DNA damage sensitivity.

Main Results:

  • SPINDOC forms two distinct complexes, one with SPIN1 and another with PARP1.
  • SPINDOC expression is induced by DNA damage and it is recruited to lesions.
  • SPINDOC knockout cells and mice exhibit reduced PARylation and hypersensitivity to DNA damage.
  • SPINDOC facilitates PARP1 clearance from DNA lesions and influences PARP1 transcriptional targets.

Conclusions:

  • SPINDOC plays a critical role in the DNA damage response through a mechanism independent of SPIN1.
  • SPINDOC regulates PARP1-mediated PARylation and DNA repair dynamics.