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Integrated transcriptomic and epigenomic analysis of ovarian cancer reveals epigenetically silenced GULP1

Leonel Maldonado1, Mariana Brait2, Evgeny Izumchenko2

  • 1Department of Otolaryngology and Head & Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA; Department of Pathology, University of South Alabama Medical Center, Mobile, AL, USA.

Cancer Letters
|July 3, 2018
PubMed

Insights

Researchers identified GULP1 as a key gene silenced in ovarian cancer (OC). GULP1 methylation is linked to advanced stages and poor survival, suggesting its role in OC progression.

Area of Science:

  • Oncology
  • Epigenetics
  • Molecular Biology

Background:

  • Epigenetic silencing of tumor suppressor genes is crucial in ovarian cancer (OC) development.
  • Identifying novel epigenetically inactivated genes is essential for understanding OC progression.

Purpose of the Study:

  • To identify novel epigenetically silenced genes in ovarian cancer using an integrated approach.
  • To investigate the role of GULP1 (gene identified) in OC development and progression.

Main Methods:

  • Genome-wide expression profiling of primary OC samples and normal ovarian surface epithelium.
  • Pharmacologic unmasking strategy in OC and normal ovarian epithelial cell lines.
  • GULP1 methylation analysis in OC tissues and correlation with clinicopathological parameters and survival.

Main Results:

  • Identified 43 OC-specific methylated genes, with GULP1 as a top candidate.
  • GULP1 methylation detected in 34% of OC cases in a training set and 40% in an independent cohort.
  • GULP1 methylation significantly associated with advanced stage, poor differentiation, residual disease, and worse survival outcomes.

Conclusions:

  • GULP1 is frequently methylated and epigenetically silenced in ovarian cancer.
  • GULP1 acts as a tumor suppressor, regulating cell survival and growth control in OC.
  • GULP1 methylation serves as a potential biomarker for OC diagnosis and prognosis.
Keywords:
BiomarkersDNA methylationEpigeneticsGULP1Ovarian cancer

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