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Studying Cell Cycle-regulated Gene Expression by Two Complementary Cell Synchronization Protocols
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DEK over-expression promotes mitotic defects and micronucleus formation.

Marie C Matrka1, Robert F Hennigan1, Ferdinand Kappes2,3

  • 1a Cancer and Blood Diseases Institute; Cincinnati Children's Hospital Medical Center and University of Cincinnati ; Cincinnati , OH USA.

Cell Cycle (Georgetown, Tex.)
|May 7, 2015
PubMed
Summary
This summary is machine-generated.

Overexpression of the DEK gene, crucial for DNA repair and replication, disrupts cell division. Its abnormal presence during mitosis leads to genomic instability and may initiate cancer development.

Keywords:
DEKaneuploidycancerchromosome instabilitymicronucleimitosismitotic defects

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • The DEK gene encodes a nuclear protein vital for DNA replication, repair, and transcription.
  • DEK overexpression is observed in several early-stage cancers, suggesting a role in oncogenesis.

Purpose of the Study:

  • To investigate the role of DEK in cell division and its association with cancer.
  • To identify DEK-correlated genes involved in mitosis.

Main Methods:

  • Utilized cancer databases to correlate DEK expression with other gene transcripts.
  • Performed immunofluorescence analyses in human keratinocytes to track DEK localization during cell division.
  • Assessed the impact of DEK overexpression on cell division and genomic integrity.

Main Results:

  • DEK normally dissociates from DNA during prophase and re-associates during telophase.
  • DEK protein levels decrease significantly before mitosis, but overexpression causes aberrant chromatin association.
  • Overexpressed DEK co-localizes with mitotic errors like anaphase bridges and micronuclei, inducing their formation.

Conclusions:

  • Normal clearance of DEK during mitosis is essential for maintaining chromosomal integrity and accurate cell division.
  • DEK overexpression promotes genomic instability by leading to genetically abnormal daughter cells.
  • Aberrant DEK activity may contribute to cancer initiation by causing oncogenic mutations.