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  • Title: A variant of the SYT-SSX2 fusion gene in a case of synovial sarcoma.
    Author: Otsuka S, Nishijo K, Nakayama T, Aoyama T, Ishibe T, Shibata KR, Shima Y, Nakamura T, Otsuka T, Toguchida J.
    Journal: Cancer Genet Cytogenet; 2006 May; 167(1):82-8. PubMed ID: 16682293.
    Abstract:
    Synovial sarcoma is a malignant soft tissue tumor harboring a tumor-specific fusion gene, SYT-SSX, of which exon 10 of the SYT gene is fused to exon 6 of the SSX gene is the common form. Here we report a case of synovial sarcoma with a novel form of the SYT-SSX2 fusion transcript, in which 75 bases were inserted at the common fusion junction. Computer analyses revealed that 15 bases were from intron 10 of the SYT gene, and 10 from the end of intron 4, and 50 from exon 5 of the SSX2 gene. Precise analyses of genomic breakpoints in SYT and SSX2 loci revealed that the reciprocal translocation creating the fusion gene was associated with a large deletion in both loci. The structure of SYT-SSX2 suggests that the fusion transcript in this case was created using a cryptic splicing acceptor site 15 bases upstream of the genomic fusion point, incorporating intronic sequences in mature mRNA. Reexamination of two variant SYT-SSX2 genes reported previously revealed that unknown sequences inserted at the common junction points were derived from intron sequences, as in the present case.
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