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Related Concept Videos

Restarting Stalled Replication Forks02:37

Restarting Stalled Replication Forks

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, a...
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The Spindle Assembly Checkpoint

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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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Separation of Sister Chromatids

At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
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Homologous Recombination

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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Using Caenorhabditis elegans to Screen for Tissue-Specific Chaperone Interactions
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Functional interaction between Chfr and Kif22 controls genomic stability.

Subbareddy Maddika1, Shirley M-H Sy, Junjie Chen

  • 1Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, CT 06520, USA.

The Journal of Biological Chemistry
|March 27, 2009
PubMed
Summary
This summary is machine-generated.

Checkpoint protein with FHA and RING domains (Chfr) regulates mitotic entry. This study identifies Kif22 as a novel Chfr substrate, crucial for maintaining chromosome stability and acting as a tumor suppressor.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Proper activation of mitotic checkpoints prevents genomic instability.
  • Chfr (Checkpoint protein with FHA and RING domains) is an E3 ubiquitin ligase regulating early mitotic checkpoints.
  • Chfr is implicated as a potential tumor suppressor, necessitating identification of its substrates.

Purpose of the Study:

  • To identify novel substrates of Chfr.
  • To elucidate the role of Chfr-mediated regulation in mitotic transitions and tumor suppression.
  • To understand how Chfr maintains genome integrity in vivo.

Main Methods:

  • Co-immunoprecipitation to identify Chfr-associated proteins.
  • Western blotting to confirm protein interactions and down-regulation.
  • Functional assays to assess the role of Kif22 in chromosome stability.

Main Results:

  • Kif22, a chromokinesin, was identified as a novel Chfr-associated protein.
  • Kif22 was confirmed as a direct substrate of Chfr.
  • Chfr-mediated down-regulation of Kif22 is essential for maintaining chromosome stability.

Conclusions:

  • Kif22 is a novel substrate of Chfr, linking Chfr to the regulation of chromosome integrity.
  • The Chfr-Kif22 pathway plays a critical role in preventing genomic instability.
  • This discovery provides new insights into Chfr's tumor suppressor function.