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Using Micro-computed Tomography for the Assessment of Tumor Development and Follow-up of Response to Treatment in a Mouse Model of Lung Cancer
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Inactivation of SMARCA2 by promoter hypermethylation drives lung cancer development

Jixiang Wu1, Keshuai He2, Yajun Zhang3

  • 1Department of Cardio-Vascular Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing 211166, China; Department of Cardiothoracic Surgery, The Third People's Hospital of Yancheng City, Yancheng 224000, China.

Gene
|November 18, 2018
PubMed

Insights

SMARCA2 is a tumor suppressor gene in lung cancer, frequently inactivated by promoter hypermethylation. Its reduced expression correlates with poor patient survival and inhibited cancer cell vitality, suggesting therapeutic potential.

Area of Science:

  • Molecular Biology
  • Cancer Genomics
  • Epigenetics

Background:

  • The SWI/SNF complex plays crucial roles in gene regulation and cancer.
  • Mechanisms of SMARCA2 inactivation remain underexplored.
  • SMARCA2 is a component of the SWI/SNF chromatin remodeling complex.

Purpose of the Study:

  • To investigate the mechanisms of SMARCA2 inactivation.
  • To evaluate the role of promoter methylation in SMARCA2 regulation.
  • To assess the tumor-suppressive function of SMARCA2 in lung cancer.

Main Methods:

  • Multi-omics analysis of The Cancer Genome Atlas (TCGA) database.
  • Utilized the dCas9-DNMT3a system to assess promoter methylation.
  • Conducted in vitro experiments to evaluate SMARCA2's role in lung cancer.

Main Results:

  • SMARCA2 promoter hypermethylation significantly correlated with decreased SMARCA2 expression.
  • dCas9-DNMT3a system showed ~30% promoter hypermethylation and a 3-fold decrease in mRNA levels in H1299 cells.
  • SMARCA2 inactivation was linked to poor survival in lung cancer patients (HR=0.35).
  • SMARCA2 demonstrated tumor-suppressive activity, inhibiting lung cancer cell vitality.

Conclusions:

  • Promoter hypermethylation is a key mechanism contributing to SMARCA2 inactivation.
  • SMARCA2 functions as a tumor suppressor in lung cancer.
  • SMARCA2 inactivation is associated with adverse patient outcomes, highlighting its potential as a therapeutic target.
Keywords:
HypermethylationLung cancerSMARCA2dCas9-DNMT3a

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