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Gene mutation analysis in five cases of dermatofibrosarcoma protuberans using formalin-fixed, paraffin-embedded
Hidehisa Saeki1, Yuichiro Tsunemi, Mamitaro Ohtsuki
1Department of Dermatology, Faculty of Medicine, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8655, Japan. saeki-der@h.u-tokyo.ac.jp
Acta Dermato-Venereologica
|July 26, 2005
Summary
Researchers identified novel gene fusions in dermatofibrosarcoma protuberans, specifically linking the collagen type I a 1 (COL1A1) gene to the platelet-derived growth factor B-chain (PDGFB) gene. This discovery aids in diagnosing this rare skin cancer using standard tissue samples.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Dermatofibrosarcoma protuberans (DFSP) is a rare skin cancer.
- Gene fusions involving COL1A1 and PDGFB have been implicated in DFSP.
- Understanding specific breakpoints is crucial for diagnostic and therapeutic advancements.
Purpose of the Study:
- To investigate the breakpoints of the COL1A1 gene in DFSP.
- To confirm and identify novel COL1A1-PDGFB fusion transcripts in tumor specimens.
- To assess the utility of detecting these fusion transcripts in formalin-fixed, paraffin-embedded tissues.
Main Methods:
- Analysis of formalin-fixed, paraffin-embedded tumor specimens from five DFSP patients.
- Reverse transcriptase-polymerase chain reaction (RT-PCR) to detect fusion transcripts.
- Nucleotide sequence analysis of PCR products to identify specific gene fusion breakpoints.
Main Results:
- COL1A1-PDGFB fusion transcripts were successfully detected in the studied DFSP specimens.
- Specific fusion breakpoints were identified, with COL1A1 exons 18, 29, 38, 42, and 44 fusing with PDGFB exon 2.
- A novel breakpoint involving COL1A1 exon 44 was identified.
Conclusions:
- The study confirms the presence of COL1A1-PDGFB gene fusions in DFSP.
- The identification of a novel breakpoint expands the understanding of DFSP molecular pathology.
- Detecting these fusion transcripts in routinely processed tissue is a valuable diagnostic tool for DFSP, especially when fresh samples are unavailable.