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Updated: May 11, 2026
Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
Published on: June 7, 2019
Lack of SF3B1 R625 mutations in cutaneous melanoma
Bastian Schilling1, Nicola Bielefeld, Antje Sucker
1Department of Dermatology, University Hospital, University Duisburg-Essen, Hufelandstrasse 55, Essen 45147, Germany.
Background:
Melanoma is a deadly disease affecting people worldwide. Genetic studies have identified different melanoma subtypes characterized by specific recurrently mutated genes and led to the successful clinical introduction of targeted therapies. Hotspot mutations in SF3B1 were recently reported in uveal melanoma. Our aim was to see if these mutations also occur in cutaneous melanoma.
Findings:
We analyzed a cohort of 85 cutaneous melanoma including 22 superficial spreading, 24 acral-lentiginous, 36 nodular, and 3 lentigo-maligna melanomas. Exon 14 of SF3B1, containing the site of recurrent mutations described in uveal melanoma, was sequenced in all samples. Additionally, NRAS exon 1 and 2 and BRAF exon 15 were sequenced in all, KIT exons 9, 11, 13, 17, and 18 in 30 samples. High numbers of BRAF and NRAS mutations were identified with frequencies varying according to melanoma subtype. None of the samples were found to harbor a SF3B1 mutation.
Conclusions:
We conclude that recurrent mutations in codon 625 of SF3B1 as reported in uveal melanoma are not present in most types of cutaneous melanoma. This highlights the genetic differences between cutaneous and uveal melanoma and the need for subtype specific therapeutic approaches.
Insights
Cutaneous melanoma, unlike uveal melanoma, rarely harbors SF3B1 mutations. This finding underscores the distinct genetic profiles of melanoma subtypes, necessitating tailored therapeutic strategies for each. Further research into these genetic differences is crucial.
Area of Science:
- Oncology
- Genetics
- Dermatology
Background:
- Melanoma is a global health concern with diverse genetic subtypes.
- Targeted therapies have emerged from genetic studies of melanoma.
- SF3B1 mutations are noted in uveal melanoma.
Purpose of the Study:
- To investigate the presence of SF3B1 mutations in cutaneous melanoma.
- To compare the genetic landscape of cutaneous and uveal melanoma.
Main Methods:
- Sequencing of SF3B1 exon 14 in 85 cutaneous melanoma samples.
- Analysis of NRAS, BRAF, and KIT mutations in a subset of samples.
- Stratification of samples by melanoma subtype: superficial spreading, acral-lentiginous, nodular, and lentigo-maligna.
Main Results:
- High frequencies of BRAF and NRAS mutations were observed, varying by subtype.
- No SF3B1 mutations were detected in any of the cutaneous melanoma samples analyzed.
- Genetic analysis revealed significant differences between melanoma subtypes.
Conclusions:
- Recurrent SF3B1 mutations found in uveal melanoma are absent in most cutaneous melanoma types.
- Genetic disparities between cutaneous and uveal melanoma necessitate subtype-specific treatments.
- This study emphasizes the importance of personalized therapeutic approaches in melanoma management.
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