Recurrent and novel SS18-SSX fusion transcripts in synovial sarcoma: description of three new casesReport as inadecuate




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Tumor Biology

, Volume 33, Issue 6, pp 2245–2253

First Online: 14 September 2012Received: 22 May 2012Accepted: 09 August 2012

Abstract

Synovial sarcoma SS is an aggressive type of tumor, comprising approximately 10 % of soft tissue sarcomas. Over 90 % of SS cases are characterized by the tX;18p11.2;q11.2 translocation, which results mainly in the formation of oncogenic SS18-SSX1 or SS18-SSX2 fusions. In a typical SS18-SSX fusion transcript, exon 10 of SS18 is fused to exon 6 of SSX1-2. However, several variant fusion transcripts have been already described. In the present study, we examined the fusion transcript type in a series of 40 primary untreated SS tumor specimens using reverse transcription polymerase chain reaction and fluorescence in situ hybridization assay. We detected SS18-SSX1 transcript in 22 55 % patients and SS18-SSX2 transcript in 17 42.5 % patients, while in one patient, none of SS18-SSX1-2 fusion transcripts were identified. Among the cases under study, two tumors carried novel SS18-SSX1 and SS18-SSX2 variant translocations that were allegedly created by an alternative splicing, and in additional case, an unusual translocation variant previously described by other group was found. Our data suggest that alternative splicing may play an important role in novel fusion transcript formation, and additionally we show that it may be a recurrent event in SS. Furthermore, we describe the first case of a complex rearrangement possibly linking SS to REPS2 gene.

KeywordsSynovial sarcoma Molecular markers Fusion genes SS18-SSX fusion genes  Download fulltext PDF



Author: Joanna Przybyl - Raf Sciot - Piotr Rutkowski - Janusz A. Siedlecki - Vanessa Vanspauwen - Ignace Samson - Maria Debiec-Ryc

Source: https://link.springer.com/



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