A mutation found in the promoter region of the human survivin gene is correlated to overexpression of survivin in cancer cells

DNA and Cell Biology
Yong XuDavy Jones

Abstract

Survivin, a unique antiapoptotic factor, plays an important role in cell cycle regulation. Numerous clinical studies have shown that survivin is markedly overexpressed in most common types of cancer, suggesting that transcriptional deregulation is a major mechanism involved in aberrant expression of survivin in cancers. In this study, we have identified several polymorphisms in the survivin gene promoter. One of these polymorphisms is located at CDE/CHR repressor elements, and appears to be a common mutation with high frequency among cancer cell lines compared to normal cell line controls. The presence of the mutation was correlated in these cell lines with increased survivin expression at the both mRNA and protein levels. Furthermore, gel mobility shift analysis and transcriptional analysis showed the mutation changed cell cycle-dependent transcription by modifying the binding motif of the CDE/CHR repressor. These results indicate that the high level of survivin in some cancers is, at least in part, due to a genetic defect in the promoter region of the human survivin gene, which causes derepression of survivin transcription apparently due to the mutated CDE/CHR repressor binding motifs.

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