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Updated: Jun 7, 2025

Studying Mitotic Checkpoint by Illustrating Dynamic Kinetochore Protein Behavior and Chromosome Motion in Living Drosophila Syncytial Embryos
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MAD2L2 Dimerization Is Not Essential for Mitotic Regulation.

Nomi Barda1, Philippa Jennifer Ayiku1, Amit Bar-On1

  • 1Molecular Biology Department, Ariel University, Ariel 40700, Israel.

International Journal of Molecular Sciences
|November 9, 2024
PubMed
Summary
This summary is machine-generated.

Mitotic regulation by MAD2L2 (a HORMA domain protein) does not require its dimerization. The protein MAD2L2 functions as a monomer during mitosis, with CDH1 binding influencing its cellular balance.

Keywords:
MAD2L2TLSmitosis

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • MAD2L2 (a HORMA domain protein) is essential for DNA repair and mitosis.
  • MAD2L2 dimerization is critical for its function in TLS and shieldin complexes.
  • The dimerization state of MAD2L2 during mitosis is currently unknown.

Purpose of the Study:

  • To investigate the role of MAD2L2 dimerization in mitotic regulation.
  • To determine if MAD2L2 homodimerization is essential for mitotic fidelity.

Main Methods:

  • CRISPR/Cas9 was used to generate MAD2L2 knockout cells.
  • Cells were complemented with MAD2L2 mutants designed to disrupt dimerization.
  • Mitotic regulation was assessed by evaluating early mitotic events and mitotic fidelity.

Main Results:

  • MAD2L2 can function effectively in its monomeric form during mitosis.
  • MAD2L2 homodimerization is dispensable for early mitotic regulation and fidelity.
  • CDH1 binding to MAD2L2 appears to regulate its dimerization state during mitosis.

Conclusions:

  • MAD2L2 homodimerization is not required for its function in mitosis.
  • The equilibrium between monomeric and dimeric MAD2L2 is a key regulatory factor.
  • CDH1 interaction may actively favor the monomeric form of MAD2L2 in mitosis.