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Related Experiment Video

Updated: Sep 24, 2025

Screening for Melanoma Modifiers using a Zebrafish Autochthonous Tumor Model
10:23

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MITF deficiency accelerates GNAQ-driven uveal melanoma.

Grace B Phelps1,2, Hannah R Hagen1,2, Adam Amsterdam1,2

  • 1David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139.

Proceedings of the National Academy of Sciences of the United States of America
|May 5, 2022
PubMed
Summary
This summary is machine-generated.

Microphthalmia-associated transcription factor (MITF) acts as a tumor suppressor in uveal melanoma (UM), contrary to its role in cutaneous melanoma (CM). Loss of MITF accelerates UM development by promoting YAP signaling.

Keywords:
melanomamitfuvealzebrafish

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Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • Cutaneous melanoma (CM) and uveal melanoma (UM) arise from melanocytes but have distinct drivers (BRAF/NRAS in CM, GNAQ/GNA11 in UM).
  • Microphthalmia-associated transcription factor (MITF) is crucial for CM but its role in UM is unclear.

Purpose of the Study:

  • To investigate the role of MITF in uveal melanoma (UM) development.
  • To identify key oncogenic signaling pathways in UM using zebrafish models.

Main Methods:

  • Utilized zebrafish models with patient-derived mutations in GNAQ or CYSLTR2, and tp53.
  • Investigated the role of YAP and phospholipase C-β (PLCβ)–ERK pathways.
  • Assessed the impact of mitfa deficiency on UM initiation and progression.

Main Results:

  • GNAQ/CYSLTR2 mutations combined with tp53 mutations drive UM.
  • Activated YAP strongly induced UM, while PLCβ mutations rarely did.
  • Mitfa deficiency accelerated UM onset and progression, promoting YAP signaling and suppressing ERK activity.

Conclusions:

  • YAP signaling is a major driver of UM.
  • MITF functions as a tumor suppressor in UM, opposing its role in CM.
  • Understanding MITF's role in UM opens new avenues for targeted therapies.