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Alterations of Fas (Apo-1/CD95) gene in cutaneous malignant melanoma
1Departments of Pathology, Cancer Research Institute, College of Medicine, The Catholic University of Korea, Seoul, Korea.
Abstract:
Fas (Apo-1/CD95) is a cell-surface receptor involved in cell death signaling. The key role of the Fas system in negative growth regulation has been studied mostly within the immune system, and somatic mutations of Fas gene in cancer patients have been described solely in lymphoid-lineage malignancies. However, many nonlymphoid tumor cells have been found to be resistant to Fas-mediated apoptosis, which suggests that Fas mutations, one of the possible mechanisms for Fas resistance, may be involved in the pathogenesis of nonlymphoid malignancies as well. In this study, we have analyzed the entire coding region and all splice sites of the Fas gene for the detection of the gene mutations in 44 human malignant melanomas in skin by polymerase chain reaction, single-strand conformation polymorphism, and DNA sequencing. Overall, 3 tumors (6.8%) were found to have the Fas mutations, which were all missense variants and identified in the cytoplasmic region (death domain) known to be involved in the transduction of an apoptotic signal. The data presented here suggest that somatic alterations of the Fas gene might lead to the loss of its apoptotic function and contribute to the pathogenesis of some human malignant melanomas.
Insights
Somatic mutations in the Fas gene were found in 6.8% of malignant melanomas. These Fas gene alterations may impair apoptosis, contributing to skin cancer development.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- The Fas receptor (Apo-1/CD95) is crucial for apoptosis and growth regulation, primarily studied in the immune system.
- Somatic Fas gene mutations are documented in lymphoid cancers, but resistance to Fas-mediated apoptosis in nonlymphoid tumors suggests potential roles in other cancers.
Purpose of the Study:
- To investigate the presence and nature of Fas gene mutations in human malignant melanoma.
- To determine if Fas gene alterations contribute to the pathogenesis of skin cancer.
Main Methods:
- Analysis of the entire coding region and splice sites of the Fas gene.
- Utilized polymerase chain reaction (PCR), single-strand conformation polymorphism (SSCP), and DNA sequencing.
- Examined 44 samples of human malignant melanoma.
Main Results:
- Fas mutations were detected in 3 out of 44 (6.8%) malignant melanoma samples.
- All identified mutations were missense variants located in the cytoplasmic death domain of the Fas protein.
- These mutations are predicted to affect the apoptotic signaling pathway.
Conclusions:
- Somatic alterations in the Fas gene occur in a subset of malignant melanomas.
- These Fas gene mutations may lead to a loss of apoptotic function, potentially contributing to the development of skin cancer.