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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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As cells progress into mitosis, the nuclear envelope breaks down, and the condensed chromosomes are exposed to the array of bipolar microtubules of the mitotic spindle. The kinetochore, a large, disc-shaped protein complex, is present at the centromere region of the sister chromatids and acts as a binding site for the microtubules.  Usually, the plus-end of a single microtubule is embedded within the kinetochore. However, some kinetochores first establish lateral contact with the side-wall...
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Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
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Cohesin protein complexes are a molecular glue that holds two sister chromatids together. They play an important role both in mitosis and meiosis. In mitosis, all cohesin complexes present on the chromosomes are removed before the start of the anaphase stage.
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Detection of Homologous Recombination Intermediates via Proximity Ligation and Quantitative PCR in Saccharomyces cerevisiae
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The BLM-TOP3A-RMI1-RMI2 proximity map reveals that RAD54L2 suppresses sister chromatid exchanges.

Jung Jennifer Ho1,2, Edith Cheng1,2, Cassandra J Wong3

  • 1Department of Biochemistry, University of Toronto, 1 King's College Circle, Toronto, ON, M5S 1A8, Canada.

EMBO Reports
|January 27, 2025
PubMed
Summary

This study identifies RAD54L2 as a key protein interacting with the Bloom (BLM) helicase complex. RAD54L2 helps suppress potentially harmful DNA recombination, maintaining genome stability and offering insights into Bloom Syndrome.

Keywords:
BioIDBloom SyndromeRAD54L2RecombinationSister Chromatid Exchanges

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Homologous recombination is a critical DNA repair pathway essential for genome integrity.
  • Mutations in homologous recombination genes can lead to cancer and genetic disorders like Bloom Syndrome.
  • Bloom Syndrome results from impaired function of the BLM-TOP3A-RMI1-RMI2 (BTRR) complex, which normally suppresses crossover recombination.

Purpose of the Study:

  • To identify proteins interacting with the BTRR complex and involved in suppressing crossover recombination.
  • To elucidate the role of RAD54L2 in the BTRR complex and its impact on DNA repair.

Main Methods:

  • Proximity proteomic analysis to map the BTRR complex interactome.
  • Biochemical assays to investigate the interaction and function of RAD54L2 with BLM.
  • Assessment of sister chromatid exchanges to evaluate the role of RAD54L2 in recombination suppression.

Main Results:

  • A comprehensive BTRR proximal proteome was established, identifying novel interacting proteins.
  • RAD54L2, a SNF2-family protein, was found to physically interact with BLM.
  • RAD54L2 suppresses sister chromatid exchanges, is crucial for BLM recruitment to chromatin, and promotes non-crossover recombination.

Conclusions:

  • RAD54L2 is identified as a novel regulator of homologous recombination within the BTRR complex.
  • Understanding RAD54L2's function provides new insights into the molecular mechanisms underlying Bloom Syndrome and genome stability.