Defining the Molecular Genetics of Dermoscopic Naevus Patterns

Area of Science:

• Dermatology
• Genetics
• Oncology

Background:

• Melanocytic naevi (moles) are benign proliferations that can clinically mimic malignant melanoma.
• Naevi often possess somatic mutations linked to melanoma development, but usually lack the complete genomic alterations for malignancy.

Purpose of the Study:

• To review the classification, pathogenesis, and somatic mutational landscape of melanocytic naevi.
• To correlate clinical, dermoscopic, pathological, and genomic findings in naevi and melanoma.

Main Methods:

• Literature review of studies on naevogenesis and somatic alterations in naevi and melanoma.
• Analysis of the molecular hallmarks distinguishing naevi from melanoma based on dermoscopic subsets.

Main Results:

• Naevi share some mutations with melanoma, particularly involving the mitogen-activated protein kinase pathway.
• Ultraviolet radiation is a key factor in naevogenesis.
• Distinct somatic mutational landscapes exist between naevi and melanoma, identifiable through dermoscopic analysis.

Conclusions:

• Melanocytic naevi are distinct entities from melanoma, despite shared mutational pathways.
• Understanding the genomic differences is crucial for accurate diagnosis and management of pigmented skin lesions.