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Updated: Feb 19, 2026
Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
Published on: June 7, 2019
The MeLiM Minipig: An Original Spontaneous Model to Explore Cutaneous Melanoma Genetic Basis
1LREG, CEA, Université Paris-Saclay, Jouy-en-Josas, France.
Abstract:
Melanoma is the deadliest skin cancer and is a major public health concern with a growing incidence worldwide. As for other complex diseases, animal models are needed in order to better understand the mechanisms leading to pathology, identify potential biomarkers to be used in the clinics, and eventually molecular targets for therapeutic solutions. Cutaneous melanoma, arising from skin melanocytes, is mainly caused by environmental factors such as UV radiation; however a significant genetic component participates in the etiology of the disease. The pig is a recognized model for spontaneous development of melanoma with features similar to the human ones, followed by a complete regression and a vitiligo-like depigmentation. Three different pig models (MeLiM, Sinclair, and MMS-Troll) have been maintained through the last decades, and different genetic studies have evidenced a complex inheritance of the disease. As in humans, pigmentation seems to play a prominent role, notably through MC1R and MITF signaling. Conversely, cell cycle genes as CDKN2A and CDK4 have been excluded as predisposing for melanoma in MeLiM. So far, only sparse studies have focused on somatic changes occurring during oncogenesis, and have revealed major cytological changes and a potential dysfunction of the telomere maintenance system. Finally, the spontaneous tumor progression and regression occurring in these models could shed light on the interplay between endogenous retroviruses, melanomagenesis, and adaptive immune response.
Insights
Pig models offer valuable insights into melanoma, a deadly skin cancer. These models help researchers understand disease mechanisms, identify biomarkers, and explore therapeutic targets for human melanoma.
Area of Science:
- Veterinary Medicine
- Dermatology
- Oncology
Background:
- Melanoma is a significant global health issue with increasing incidence.
- Animal models are crucial for understanding complex diseases like melanoma, aiding in biomarker and therapeutic target identification.
- Pigs serve as a relevant model for spontaneous melanoma, exhibiting similarities to human conditions, including regression and depigmentation.
Purpose of the Study:
- To review the utility of pig models in melanoma research.
- To explore the genetic and molecular underpinnings of melanoma in pigs.
- To highlight the potential of these models for advancing melanoma treatment strategies.
Main Methods:
- Review of genetic studies on MeLiM, Sinclair, and MMS-Troll pig models.
- Analysis of the role of pigmentation genes (MC1R, MITF) and cell cycle genes (CDKN2A, CDK4).
- Examination of somatic changes, telomere maintenance, endogenous retroviruses, and immune response in melanoma development.
Main Results:
- Pig models display complex inheritance patterns for melanoma, similar to humans.
- Pigmentation pathways (MC1R, MITF) are implicated, while CDKN2A and CDK4 are not predisposing factors in MeLiM.
- Somatic alterations and potential telomere dysfunction are observed during oncogenesis.
Conclusions:
- Pig models are instrumental in unraveling melanoma pathogenesis and progression.
- Further research into somatic changes and the tumor microenvironment in pigs can inform human melanoma therapies.
- The interplay of genetics, retroviruses, and immunity in pig melanoma offers insights into spontaneous tumor regression.
