| Abstract: |
The pathogenesis of myxoid chondrosarcoma (CS) is poorly understood. A recurrent translocation, t(9;22)(q22;q12), has been recognized in CS, specifically in extraskeletal myxoid CS. Recently, this translocation has been shown to represent a rearrangement of the EWS gene at 22q12 with a novel gene at 9q22 designated CHN (or TEC). Sequence analysis suggests that CHN encodes a novel orphan nuclear receptor with a zinc finger DNA-binding domain. The structure of this gene fusion has been characterized in only a limited number of extraskeletal myxoid CSs and its presence in other types of CS has not been extensively examined. We studied 46 cases of CS (8 extraskeletal myxoid, 4 skeletal myxoid, 4 mesenchymal, and 30 other) for the EWS/CHN gene fusion by reverse transcriptase polymerase chain reaction. Southern blotting, and long-range DNA polymerase chain reaction. The EWS/CHN gene fusion was present in 6 of 8 extraskeletal myxoid CSs and was not detected in any of the remaining cases, including the 4 skeletal myxoid CSs. The negative findings in the latter cases suggest that skeletal myxoid CS is pathogenetically distinct from its extraskeletal counterpart. Notably, 2 cases of extraskeletal myxoid CS showed neither an EWS/CHN fusion transcript nor EWS/CHN genomic fusion nor EWS or CHN genomic rearrangement, suggesting genetic heterogeneity within extraskeletal myxoid CS. Finally, we also provide evidence for alternative splicing of the 3' end of the fusion transcript. Extraskeletal myxoid CS thus represents yet another sarcoma type containing a gene fusion involving EWS. |
| Keywords: |
adult; clinical article; human tissue; aged; aged, 80 and over; middle aged; retrospective studies; sequence analysis; prospective studies; polymerase chain reaction; reverse transcription polymerase chain reaction; chimera; cloning, molecular; gene rearrangement; dna, neoplasm; gene fusion; alternative splicing; alternative rna splicing; base sequence; dna binding; cell nucleus receptor; sarcoma, ewing's; chromosome analysis; chondrosarcoma; rna, neoplasm; dna determination; soft tissue neoplasms; genetic heterogeneity; dna, complementary; southern blotting; rna analysis; chromosome translocation 22; blotting, southern; humans; human; male; female; priority journal; article; chromosome translocation 9
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