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Updated: Jun 2, 2026
Merkel Cell Polyomavirus Infection and Detection
Published on: February 7, 2019
Identification of the M541L sequence variation of the transmembrane KIT domain in Merkel cell carcinoma
Konstantin Krasagakis1, Maria Metaxari, Maria Zervou
1Department of Dermatology, Faculty of Medicine, University of Crete, GR-71003 Heraklion, Greece. krasagak@med.uoc.gr
Background:
Merkel cell carcinoma (MCC) is an aggressive KIT-positive cutaneous tumor. KIT mutations are considered to play a key role in the pathogenesis of various neoplasms, but have not been found so far in MCC. The aim of the present study was therefore to investigate the presence of KIT mutations in MCC.
Materials And Methods:
The entire coding region of KIT in the MCC cell line MCC-1 was sequenced. KIT exon 10 was amplified from archival paraffin-embedded MCC specimens by PCR and sequenced.
Results:
Exon 10 M541L KIT sequence variation, which confers increased sensitivity to KIT ligand stem cell factor, was detected in the MCC-1 cell line. Sequencing of KIT exon 10 in six archival MCC specimens revealed the wild-type sequence.
Conclusion:
The presence of the M541L KIT variation in MCC warrants further studies for its role in the pathogenesis of this tumor.
Insights
A KIT mutation (M541L) was found in a Merkel cell carcinoma (MCC) cell line, but not in patient samples. This finding requires further investigation into the role of KIT variations in MCC development.
Area of Science:
- Oncology
- Molecular Biology
- Dermatology
Background:
- Merkel cell carcinoma (MCC) is an aggressive skin cancer.
- MCC is characterized as a KIT-positive tumor.
- The role of KIT mutations in MCC pathogenesis is largely unknown.
Purpose of the Study:
- To investigate the presence of KIT mutations in Merkel cell carcinoma.
- To determine if KIT mutations contribute to MCC development.
Main Methods:
- Sequencing of the entire coding region of KIT in the MCC-1 cell line.
- PCR amplification and sequencing of KIT exon 10 from archival MCC specimens.
Main Results:
- A KIT exon 10 M541L sequence variation was identified in the MCC-1 cell line.
- This variation increases sensitivity to stem cell factor.
- KIT exon 10 sequencing in six MCC patient samples revealed wild-type sequences.
Conclusions:
- The M541L KIT variation found in an MCC cell line warrants further research.
- The specific role of this KIT variation in MCC pathogenesis needs to be elucidated.
