Transformation capacities of the papillary renal cell carcinoma-associated PRCCTFE3 and TFE3PRCC fusion genes.
A recurrent chromosomal abnormality associated with a subset of papillary renal cell carcinomas is t(X;1)(p11;q21). This translocation leads to the formation of two fusion genes, TFE3PRCC and the reciprocal product PRCCTFE3. Both fusion genes are expressed in t(X;1)-positive renal cell carcinomas and contain major parts of the coding regions of the parental transcription factor PRCC and TFE3 genes, respectively. To find out whether these fusion genes possess transforming capacity, we transfected NIH3T3 and rat-1 cells with the fusion products, either separately or combined. When using soft agar assays, we observed colony formation in all cases. NIH3T3 cells transfected with PRCCTFE3 or PRCCTFE3 together with TFE3PRCC yielded the highest colony forming capacities. Examination of other characteristics associated with malignant transformation, i.e., growth under low-serum conditions and formation of tumors in athymic nude mice, revealed that cells transfected with PRCCTFE3 exhibited all these transformation-associated characteristics. Upon transfection of the fusion products into conditionally immortalized kidney cells, derived from the proximal tubules of an H-2Kb-tsA58 transgenic mouse, and consecutive incubation under non-permissive conditions, growth arrest was observed, followed by differentiation except for those cells transfected with PRCCTFE3. Therefore, we conclude that PRCCTFE3 may be the t(X;1)-associated fusion product that is most critical for the development of papillary renal cell carcinomas.
Weterman
M A
MA
Department of Human Genetics, University Medical Center Nijmegen, The Netherlands.
van Groningen
J J
JJ
den Hartog
A
A
Geurts van Kessel
A
A
D016475:3T3 Cells; D000818:Animals; D051778:Basic Helix-Loop-Helix Leucine Zipper Transcription Factors; D002291:Carcinoma, Papillary / Q000235:genetics; D002292:Carcinoma, Renal Cell / Q000235:genetics*; D002448:Cell Adhesion; D018797:Cell Cycle Proteins; D002471:Cell Transformation, Neoplastic / Q000235:genetics*; D002869:Chromosome Aberrations; D025063:Chromosome Disorders; D004268:DNA-Binding Proteins / Q000235:genetics*; D006801:Humans; D007668:Kidney / Q000166:cytology; D007680:Kidney Neoplasms / Q000235:genetics*; D051379:Mice; D009363:Neoplasm Proteins; D015514:Oncogene Proteins, Fusion / Q000235:genetics*; D011506:Proteins / Q000235:genetics; D051381:Rats; D014157:Transcription Factors / Q000235:genetics*; D014162:Transfection; D014178:Translocation, Genetic
D051778:Basic Helix-Loop-Helix Leucine Zipper Transcription Factors; D018797:Cell Cycle Proteins; D004268:DNA-Binding Proteins; D009363:Neoplasm Proteins; D015514:Oncogene Proteins, Fusion; C415042:PRCC protein, human; C498808:Prcc protein, mouse; D011506:Proteins; C069203:TFE3 protein, human; D014157:Transcription Factors