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Activating c-kit gene mutations in human germ cell tumors
Q Tian1, H F Frierson, G W Krystal
1Departments of Pathology, University of Virginia Health Sciences Center, Charlottesville, USA.
The American Journal of Pathology
|June 11, 1999
Summary
Activating mutations in the c-kit gene were discovered in human germ cell tumors (GCTs). This finding indicates the KIT signaling pathway is crucial for seminoma tumor development.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- The c-kit gene encodes a tyrosine kinase receptor (KIT) vital for spermatogenesis.
- KIT is expressed in seminomas and dysgerminomas, a subset of human germ cell tumors (GCTs).
Purpose of the Study:
- To investigate the presence of activating mutations in the c-kit gene within GCTs.
- To understand the role of the KIT signaling pathway in the pathogenesis of GCTs.
Main Methods:
- Analysis of primary tissue samples from 33 testicular and ovarian tumors.
- Polymerase chain reaction amplification and DNA sequencing to detect mutations in c-kit domains.
- Cell transfection experiments to assess the functional impact of identified mutations.
Main Results:
- A novel missense mutation (D816H) in the c-kit phosphotransferase domain was identified in seminoma/dysgerminoma tumors.
- The D816H mutant KIT protein demonstrated constitutive kinase activation and phosphorylation.
- Wild-type c-kit alleles were observed in nonneoplastic tissues, suggesting acquired mutations during tumorigenesis.
Conclusions:
- This study reports the first activating c-kit mutation found in GCTs.
- The KIT signal transduction pathway plays a significant role in the pathogenesis of neoplasms exhibiting seminoma differentiation.