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Involvement of histone deacetylation in MORC2-mediated down-regulation of carbonic anhydrase IX

Yangguang Shao1, Yan Li, Jian Zhang

  • 1Department of Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health, and Key Laboratory of Medical Cell Biology, Ministry of Education, China Medical University, Shenyang 110001, China.

Nucleic Acids Research
|January 30, 2010
PubMed

Insights

MORC2 overexpression significantly down-regulates carbonic anhydrase IX (CAIX) in tumor cells. This involves MORC2 and HDAC4 binding to the CAIX promoter, impacting tumor growth regulation.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Epigenetics

Background:

  • Carbonic anhydrase IX (CAIX) is crucial for tumor cell growth and survival.
  • MORC2, a member of the MORC protein family, is implicated in transcriptional regulation, but its targets are unknown.

Purpose of the Study:

  • To investigate the role of MORC2 in regulating CAIX expression.
  • To elucidate the molecular mechanisms underlying MORC2-mediated CAIX regulation.

Main Methods:

  • DNA microarray hybridization to identify MORC2 target genes.
  • Northern and western blot analysis to confirm gene expression changes.
  • Chromatin immunoprecipitation (ChIP) assays to assess protein-DNA interactions and histone modifications.

Main Results:

  • Overexpression of MORC2 led to an 8-fold down-regulation of CAIX mRNA.
  • MORC2-mediated repression of CAIX involves histone H3 deacetylation at the CAIX promoter.
  • Histone deacetylase 4 (HDAC4) was identified as a key mediator, forming a complex with MORC2 on the CAIX promoter's protected region 4 (PR4).

Conclusions:

  • MORC2 functions as a transcriptional repressor of CAIX.
  • The MORC2-HDAC4 complex plays a critical role in epigenetic regulation of CAIX.
  • These findings provide insights into the molecular mechanisms governing CAIX expression in cancer.

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