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Updated: Jun 18, 2026
Screening for Melanoma Modifiers using a Zebrafish Autochthonous Tumor Model
Published on: November 13, 2012
Oncogenic NRAS cooperates with p53 loss to generate melanoma in zebrafish
Michael Dovey1, Richard Mark White, Leonard I Zon
1Stem Cell Program and Hematology/Oncology, Children's Hospital, Boston, Massachusetts, USA.
Abstract:
NRAS mutations are a common oncogenic event in skin cancer, occurring frequently in congenital nevi and malignant melanoma. To study the role of NRAS in zebrafish, a transgenic approach was applied to generate fish that express human oncogenic NRAS(Q61K) under the control of the melanocyte-restricted mitfa promoter. By screening the progeny of the injected animals, two strains stably expressing the NRAS transgene were identified: Tg(mitfa:EGFP:NRAS(Q61K))(1) and Tg(mitfa:EGFP:NRAS(Q61K))(2). Stable expression of this transgene results in hyperpigmented fish displaying a complete ablation of the normal pigment pattern. Although oncogenic NRAS expression alone was found to be insufficient to promote tumor formation, loss of functional p53 was found to collaborate with NRAS expression in the genesis of melanoma. The tumors derived from these animals are variably pigmented and closely resemble human melanoma. Underscoring the pathological similarities between these tumors and human disease and suggesting that common pathways are similar in these models and human disease, gene set enrichment analysis performed on microarray data found that the upregulated genes from zebrafish melanomas are highly enriched in human tumor samples. This work characterizes two zebrafish melanoma models that will be useful tools for the study of melanoma pathogenesis.
Insights
Oncogenic NRAS expression in zebrafish can cause melanoma, especially when p53 function is lost. These zebrafish models mimic human melanoma, aiding in the study of skin cancer pathogenesis.
Area of Science:
- Genetics
- Oncology
- Zebrafish Models
Background:
- NRAS mutations are frequent in skin cancers like melanoma.
- Understanding NRAS's role in melanoma pathogenesis is crucial.
Purpose of the Study:
- To create and characterize zebrafish models for studying NRAS-driven melanoma.
- To investigate the collaboration between NRAS and p53 in melanoma development.
Main Methods:
- Generated transgenic zebrafish expressing human oncogenic NRAS(Q61K) under the mitfa promoter.
- Identified two stable transgenic lines: Tg(mitfa:EGFP:NRAS(Q61K))(1) and Tg(mitfa:EGFP:NRAS(Q61K))(2).
- Assessed tumor formation and characterized tumors using gene set enrichment analysis.
Main Results:
- Stable NRAS transgene expression led to hyperpigmentation and altered pigment patterns.
- Oncogenic NRAS alone did not cause tumor formation.
- Loss of p53 function collaborated with NRAS to induce melanoma resembling human tumors.
- Gene expression profiles of zebrafish melanomas were highly enriched in human melanoma samples.
Conclusions:
- Developed two novel zebrafish melanoma models.
- These models recapitulate key features of human melanoma, including genetic similarities.
- The models provide valuable tools for investigating melanoma pathogenesis and potential therapeutic strategies.
