Related Experiment Video
Updated: Nov 22, 2025
Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
Published on: June 7, 2019
Fatal GNAQ-mutated CNS melanoma in an adolescent with nevus of Ota
Andrew R Blundell1,2, Danna Moustafa1,3, Wesley R Samore4,5
1Department of Dermatology, Massachusetts General Hospital, Boston, MA, USA.
Abstract:
Nevus of Ota is an uncommon benign mesodermal melanosis that involves the first and second divisions of the trigeminal nerve. Primary non-cutaneous melanoma often involves distinct genetic mutations compared to cutaneous melanoma. In primary central nervous system (CNS) melanomas associated with nevus of Ota, somatic mutations most commonly occur at the Q209 and R183 residues of GNAQ and likely induce tumorigenesis through upregulation of the MAP kinase pathway. This case underscores the importance of elucidating neurologic symptoms early in patients with nevus of Ota, as a delayed presentation of CNS melanoma could portend a devastating outcome.
Insights
Nevus of Ota, a rare condition, can be linked to central nervous system (CNS) melanoma. Genetic mutations in GNAQ are common, potentially driving tumor growth via the MAP kinase pathway, highlighting the need for early neurological assessment.
Area of Science:
- Neurology
- Oncology
- Dermatology
Background:
- Nevus of Ota is a rare benign melanosis affecting trigeminal nerve divisions.
- Primary non-cutaneous melanomas exhibit different genetic profiles than cutaneous melanomas.
Purpose of the Study:
- To investigate the genetic underpinnings of primary central nervous system (CNS) melanomas in patients with Nevus of Ota.
- To highlight the clinical significance of early neurological symptom evaluation in Nevus of Ota patients.
Main Methods:
- Case study analysis.
- Genetic mutation analysis focusing on GNAQ.
- Pathway analysis including the MAP kinase pathway.
Main Results:
- Somatic mutations commonly occur at GNAQ residues Q209 and R183 in CNS melanomas associated with Nevus of Ota.
- These mutations likely promote tumorigenesis through MAP kinase pathway activation.
Conclusions:
- Early identification of neurological symptoms in Nevus of Ota patients is crucial.
- Delayed diagnosis of CNS melanoma in this context can lead to severe outcomes.
