Evaluation of genetic stability of the SYT gene rearrangement by break-apart FISH in primary and xenotransplanted synovial sarcomas.
Synovial sarcomas (SS) are infrequent and morphologically heterogeneous soft tissue sarcomas. The t(X;18)(p11.2;q11.2), which results in fusion of the SYT gene at 18q11 with the SSX1, SSX2, or (rarely) SSX4 gene is a primary genetic event in 90% of SS. To determine whether the t(X;18) present in the original tumor is maintained in its passages, a dual-color break-apart FISH assay for SYT gene disruption was performed in two tissue microarrays (TMA) comprising eight molecularly confirmed primary SSs and their xenografts, which were followed for several generations. A simplified scoring system was applied to the FISH results of the primary and xenotransplanted SS to classify the FISH data into distinct groups. SYT disruption was identified in all eight primary SS and in all their passages without any significant differences among them, despite wide variations in xenotransplantation time between the primary tumors and their xenografts. The TMA-based FISH assay demonstrated genetic stability related to SYT gene rearrangement in primary and xenografted SS.
Subramaniam
Manish Mani
MM
Department of Pathology, Medical School, University of Valencia, Avda. Blasco Ibañez, 17, 46010 Valencia, Spain.
Noguera
Rosa
R
Piqueras
Marta
M
Navarro
Samuel
S
Carda
Carmen
C
Pellin
Antonio
A
López-Guerrero
Jose Antonio
JA
Llombart-Bosch
Antonio
A
D000818:Animals; D002887:Chromosomes, Human, Pair 18 / Q000235:genetics; D041321:Chromosomes, Human, X; D015321:Gene Rearrangement; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D015514:Oncogene Proteins, Fusion / Q000235:genetics; D011518:Proto-Oncogene Proteins / Q000235:genetics*; D012097:Repressor Proteins / Q000235:genetics*; D013584:Sarcoma, Synovial / Q000235:genetics* / Q000473:pathology; D046888:Tissue Array Analysis; D014178:Translocation, Genetic; D014183:Transplantation, Heterologous
D015514:Oncogene Proteins, Fusion; D011518:Proto-Oncogene Proteins; D012097:Repressor Proteins; C093961:SS18 protein, human; C116512:SYT-SSX fusion protein