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SAMD1 suppresses epithelial-mesenchymal transition pathways in pancreatic ductal adenocarcinoma

Clara Simon1, Inka D Brunke1, Bastian Stielow1

  • 1Institute of Molecular Biology and Tumor Research (IMT), Philipps University of Marburg, Marburg, Germany.

Plos Biology
|August 13, 2024
PubMed

Insights

SAM domain-containing protein 1 (SAMD1) suppresses epithelial-mesenchymal transition (EMT) in pancreatic cancer. Loss of SAMD1 increases PDAC cell migration, highlighting its role in cancer progression and potential therapeutic targeting.

Area of Science:

  • Oncology
  • Molecular Biology
  • Gene Regulation

Background:

  • Pancreatic ductal adenocarcinoma (PDAC) is a deadly cancer with poor prognosis due to late detection and metastasis.
  • Epithelial-mesenchymal transition (EMT) is a key process driving PDAC progression and metastasis.
  • SAM domain-containing protein 1 (SAMD1) is a known repressor of gene expression.

Purpose of the Study:

  • To investigate the role of SAMD1 in regulating EMT in PDAC.
  • To identify the molecular mechanisms by which SAMD1 influences PDAC cell behavior.
  • To explore the relationship between SAMD1, FBXO11, and PDAC prognosis.

Main Methods:

  • CRISPR-Cas9 mediated SAMD1 deletion in PDAC cells.
  • Assessment of cell migration rates.
  • Chromatin immunoprecipitation sequencing (ChIP-seq) to identify SAMD1 genomic targets.
  • Co-immunoprecipitation assays to identify protein interactors.
  • Analysis of patient data correlating gene expression with prognosis.

Main Results:

  • SAMD1 deletion in PDAC cells significantly increased cell migration.
  • SAMD1 directly binds to and represses genes associated with EMT, including CDH2 (N-cadherin).
  • The FBXO11 E3 ubiquitin ligase complex interacts with and inhibits SAMD1's chromatin binding.
  • High FBXO11 expression in PDAC correlates with poor prognosis and increased EMT gene expression, indicating an antagonistic relationship with SAMD1.

Conclusions:

  • SAMD1 acts as a crucial repressor of EMT-associated genes in PDAC.
  • SAMD1's function is negatively regulated by the FBXO11 complex.
  • The opposing roles of SAMD1 and FBXO11 in regulating EMT present potential therapeutic targets for PDAC.

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