Related Experiment Video

Updated: Jul 5, 2025

Continuous Fluorescence-Based Endonuclease-Coupled DNA Methylation Assay to Screen for DNA Methyltransferase Inhibitors
06:07

Continuous Fluorescence-Based Endonuclease-Coupled DNA Methylation Assay to Screen for DNA Methyltransferase Inhibitors

Published on: August 5, 2022

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Aberrant DNA Methylation of NPTX2 as an Indicator of Malignant Behavior in Thymic Epithelial Tumors

Kazuya Kondo1, Kyoka Muguruma1, Shiho Soejima1

  • 1Department of Oncological Medical Services, Graduate School of Biomedical Sciences, Tokushima University, Tokushima 770-8509, Japan.

Cancers
|January 23, 2024
PubMed

Insights

Neuronal pentraxin 2 (NPTX2) is hypermethylated in thymic carcinoma (TC), correlating with poorer survival. NPTX2 may act as a tumor suppressor in TC but oncogenic in neuroendocrine tumors of the thymus.

Area of Science:

  • Oncology
  • Molecular Biology
  • Epigenetics

Background:

  • Thymic epithelial tumors (TET) encompass thymomas, thymic carcinoma (TC), and neuroendocrine tumors of the thymus (NECTT).
  • Recent research focuses on genetic and epigenetic alterations in TET.
  • Neuronal pentraxin 2 (NPTX2) is involved in neuronal activity, immunity, and inflammation.

Purpose of the Study:

  • To investigate the role of aberrantly methylated CpG islands in TET.
  • To identify specific methylation patterns associated with different TET subtypes.
  • To examine the expression and function of NPTX2 in TET.

Main Methods:

  • Genome-wide screening for aberrantly methylated CpG islands in TET.
  • Analysis of DNA methylation, mRNA, and protein expression of NPTX2 in TET samples (38 thymomas, 25 TC, 6 NECTT).
  • Correlation analysis between NPTX2 methylation/expression and clinical outcomes (relapse-free survival).

Main Results:

  • NPTX2 was significantly hypermethylated in TC compared to thymomas.
  • NPTX2 mRNA expression was lower in TC, inversely correlating with methylation levels.
  • High NPTX2 DNA methylation was associated with shorter relapse-free survival in TC patients.
  • NECTT exhibited high NPTX2 mRNA/protein expression and low DNA methylation.

Conclusions:

  • NPTX2 methylation patterns differ across TET subtypes.
  • NPTX2 may function as a tumor suppressor in thymic carcinoma.
  • NPTX2 might have an oncogenic role in neuroendocrine tumors of the thymus.
Keywords:
DNA methylationNPTX2mRNA expressionneuroendocrine tumors of the thymusthymic carcinomathymoma

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