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. 1990 Jun;10(6):2660–2668. doi: 10.1128/mcb.10.6.2660

Regulation of chimeric phosphoenolpyruvate carboxykinase genes by the trans-dominant locus TSE1.

M J Thayer 1, T G Lugo 1, R J Leach 1, R E Fournier 1
PMCID: PMC360625  PMID: 2342460

Abstract

Extinction of phosphoenolpyruvate carboxykinase (PCK) gene expression in hepatoma x fibroblast hybrids is mediated by a trans-acting genetic locus designated tissue-specific extinguisher 1 (TSE1). To identify PCK gene sequences required for extinction, hepatoma transfectants expressing PCK-thymidine kinase (TK) chimeric genes were fused with TK- fibroblasts and PCK-TK expression in the resulting hybrids was monitored. Expression of a PCK-TK chimera containing PCK sequences between base pairs -548 and +73 was extinguished in four of five hepatoma transfectants tested, although hybrids derived from one transfectant clone failed to extinguish PCK-TK expression. In contrast, crosses between hepatoma transfectants expressing the herpesvirus TK gene from its own promoter and TK- fibroblasts produced TK+ hybrids; extinction of the transfected TK gene was not observed. Thus, rat PCK gene sequences between base pairs -548 and +73 are sufficient for tissue-specific extinction in hybrid cells. Extinction of PCK-TK gene expression in transfectant microcell hybrids mapped specifically to human chromosome 17, the site of human TSE1.

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