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Chemical Dimerization-Induced Protein Condensates on Telomeres
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Chemical Dimerization-Induced Protein Condensates on Telomeres

Published on: April 12, 2021

Telomeric DNA mediates de novo PML body formation

Anneke K Brouwer1, Joost Schimmel, Joop C A G Wiegant

  • 1Department of Molecular Cell Biology, Leiden University Medical Center, 2300 RC Leiden, The Netherlands.

Molecular Biology of the Cell
|October 2, 2009
PubMed

Insights

Nuclear bodies like PML bodies form at telomeric DNA. The SMC5/6 complex component MMS21 is involved in their formation, highlighting a new role for telomeric DNA in nuclear body assembly.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • The cell nucleus contains various bodies crucial for nuclear processes.
  • PML bodies are nuclear bodies implicated in gene regulation and cellular processes.
  • PML body disruption is observed in acute promyelocytic leukemia.

Purpose of the Study:

  • To investigate the formation mechanism of PML bodies.
  • To identify the role of telomeric DNA in PML body formation.
  • To explore the involvement of SUMOylation in PML body assembly.

Main Methods:

  • Live cell imaging microscopy
  • Immunofluorescence in multiple cell types
  • Analysis of protein localization during interphase

Main Results:

  • PML bodies are formed at telomeric DNA during interphase.
  • SMC5, part of the SUMO ligase MMS21-containing SMC5/6 complex, transiently localizes to telomeric DNA during PML body formation.
  • This suggests a role for SUMOylation in PML body assembly at telomeres.

Conclusions:

  • Telomeric DNA plays a novel and essential role in the formation of PML bodies.
  • SUMOylation pathways, involving the SMC5/6 complex, are critical for PML body assembly at telomeres.

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