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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Structural maintenance of chromosomes (SMC) complexes are crucial for genome organization through DNA loop extrusion.
  • DNA replication is carried out by replisomes, which duplicate the entire chromosome.
  • The in vivo resolution of collisions between SMC complexes and replisomes is not well understood.

Purpose of the Study:

  • To investigate the in vivo interactions between SMC complexes and the replisome during DNA replication.
  • To determine how collisions between these essential molecular machines are resolved.
  • To understand the implications for genome organization and cellular processes.

Main Methods:

  • Engineered head-on and head-to-tail collisions between SMC complexes and the replisome in Bacillus subtilis.
  • Monitored replisome progression using genome-wide marker frequency analysis.
  • Tracked SMC complex translocation via time-resolved ChIP-seq and Hi-C, complemented by simulations.

Main Results:

  • SMC complexes did not impede replisome progression.
  • Replisomes restricted SMC translocation irrespective of collision orientation.
  • SMC complexes were observed to be blocked, released, and occasionally bypass the replisome.

Conclusions:

  • The replisome acts as a barrier to SMC-mediated DNA-loop extrusion in vivo.
  • This finding has significant implications for chromosome segregation, DNA repair, and gene regulation.
  • Dynamic chromosome organization by SMC complexes is influenced by the replisome.