Mutational analysis of the BRAF gene in human congenital and dysplastic melanocytic naevi

Area of Science:

• Oncology
• Dermatology
• Molecular Biology

Background:

• Congenital melanocytic naevi (CMN) and dysplastic melanocytic naevi (DMN) are common skin lesions.
• The BRAF oncogene is frequently mutated in cutaneous melanomas.

Purpose of the Study:

• To screen CMN and DMN for mutations in the BRAF oncogene.
• To investigate the potential role of BRAF mutations in melanoma development within CMN and DMN.

Main Methods:

• Screening of 18 CMN and 18 DMN for BRAF mutations using single-strand conformational polymorphism (SSCP)/sequencing analysis.
• Analysis of N-ras oncogene mutations from previous studies.

Main Results:

• BRAF mutations were detected in both CMN and DMN samples.
• Overall, 94.4% of CMN and 27.7% of DMN harbored either BRAF or N-ras mutations.
• BRAF mutations were identified in 17 out of 18 CMN and 5 out of 18 DMN.

Conclusions:

• The frequent occurrence of BRAF mutations in CMN and DMN suggests their potential involvement in melanoma pathogenesis.
• BRAF mutations may represent a risk factor for melanoma development in individuals with CMN and DMN.