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A Robust Discovery Platform for the Identification of Novel Mediators of Melanoma Metastasis
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A Robust Discovery Platform for the Identification of Novel Mediators of Melanoma Metastasis

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The X-Linked DDX3X RNA Helicase Dictates Translation Reprogramming and Metastasis in Melanoma

Bengt Phung1, Maciej Cieśla2, Adriana Sanna1

  • 1Division of Oncology, Department of Clinical Sciences, Lund University, Lund, Sweden.

Cell Reports
|June 20, 2019
PubMed

Insights

The DDX3X gene regulates melanoma cell metastasis by controlling MITF translation. This discovery reveals a new therapeutic target for aggressive melanoma, particularly in males.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • The X-linked DDX3X gene, encoding an RNA helicase, is frequently altered in human cancers like melanoma.
  • The precise mechanisms by which DDX3X dysfunction influences melanoma gene expression and phenotype are not well understood.

Purpose of the Study:

  • To investigate the role of DDX3X in regulating melanoma cell phenotype and prognosis.
  • To identify key downstream targets and regulatory mechanisms controlled by DDX3X in melanoma.

Main Methods:

  • Unbiased analysis of translating ribosomes to identify DDX3X targets.
  • Investigated the translational control of microphthalmia-associated transcription factor (MITF) by DDX3X.
  • Examined the role of an internal ribosome entry site (IRES) in the 5' UTR of MITF mRNA.

Main Results:

  • DDX3X dysfunction drives a post-transcriptional program that dictates melanoma phenotype and prognosis.
  • MITF was identified as a key translational target of DDX3X, mediating a switch from proliferation to metastasis.
  • DDX3X controls MITF mRNA translation via an IRES, influencing melanoma metastatic potential and therapeutic response.

Conclusions:

  • DDX3X regulates melanoma metastasis through post-transcriptional control of MITF translation.
  • This DDX3X-MITF axis represents a potential therapeutic vulnerability in aggressive melanomas, especially in males.
Keywords:
DDX3XIRESMITFmelanocytemelanomametastasismigrationresistancetherapytranslation control

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