title: Identification of syt-ssx fusion transcripts in both epithelial and spindle cell components of biphasic synovial sarcoma in small tissue samples isolated by membrane-based laser microdissection.
abstract: In order to confirm the presence of SYT-SSX fusion gene in epithelial and spindle cell components of synovial sarcoma, we performed a nested reverse transcriptase-polymerase chain reaction (RT-PCR) using microbeam microdissection of membrane-mounted native tissue (MOMeNT) technique applied on formalin-fixed, paraffin-embedded tumor specimens from two biphasic synovial sarcomas and a control tissue of adamantinoma. Small targeted portions of either an epithelial or spindle cell component of the tumor tissue were microdissected together with the supporter membrane, by using an ultraviolet (337-nm) pulsed laser microbeam coupled into a robot-stage microscope with infinity optics. The SYT-SSX fusion transcript was detected in epithelial and spindle cell components of both biphasic synovial sarcomas, but not in the control tissue. Southern blot analysis also confirmed that the detected messages were derived from the SYT-SSX fusion gene. In conclusion, the microbeam MOMeNT is a useful method for isolating selected small portions from tissue sections. The SYT-SSX fusion gene is present in both cellular components of biphasic synovial sarcoma and is involved in oncogenesis of the synovial sarcoma rather than in morphologic epithelial differentiation. Therefore, in spite of the variable proportions of each component, our results confirm that the synovial sarcoma is of monoclonal origin.
authors.affiliation: Department of Pathology, School of Medicine, Fukuoka University, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Nishio
authors.forename: H
authors.initials: H
authors.lastname: Iwasaki
authors.forename: M
authors.initials: M
authors.lastname: Ishiguro
authors.forename: Y
authors.initials: Y
authors.lastname: Ohjimi
authors.forename: T
authors.initials: T
authors.lastname: Isayama
authors.forename: M
authors.initials: M
authors.lastname: Naito
authors.forename: M
authors.initials: M
authors.lastname: Kikuchi
mesh_terms: D000328:Adult; D000368:Aged; D000564:Ameloblastoma / Q000737:chemistry / Q000235:genetics / Q000473:pathology; D014408:Biomarkers, Tumor; D001859:Bone Neoplasms / Q000737:chemistry / Q000235:genetics / Q000473:pathology; D004210:Dissection / Q000379:methods*; D004847:Epithelial Cells / Q000737:chemistry / Q000473:pathology; D005240:Feasibility Studies; D020869:Gene Expression Profiling / Q000379:methods; D006801:Humans; D007124:Immunoenzyme Techniques; D017404:In Situ Hybridization, Fluorescence; D007834:Lasers; D008297:Male; D008567:Membranes, Artificial; D008846:Micromanipulation; D008875:Middle Aged; D015514:Oncogene Proteins, Fusion / Q000032:analysis / Q000235:genetics*; D012334:RNA, Neoplasm / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013584:Sarcoma, Synovial / Q000737:chemistry / Q000235:genetics* / Q000473:pathology; D012983:Soft Tissue Neoplasms / Q000737:chemistry / Q000235:genetics* / Q000473:pathology; D014158:Transcription, Genetic
chemical_list: D014408:Biomarkers, Tumor; D008567:Membranes, Artificial; D015514:Oncogene Proteins, Fusion; D012334:RNA, Neoplasm; C116512:SYT-SSX fusion protein