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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Identification of v-Rel oncogene-induced inhibitor of apoptosis by differential display.

The v-Rel oncoprotein is a member of the Rel/NF-kappaB family of transcription factors. v-Rel induces oncogenic transformation and inhibits apoptosis. To identify aberrantly expressed cellular genes in v-Rel transformed cells, gene expression patterns in normal and v-Rel transformed cells were compared by mRNA differential display. Northern blotting analysis with radiolabeled cDNAs from differential display confirmed the reproducible differential expression of 10 transcripts in v-Rel transformed cells. One of the identified genes, termed ch-IAP1, encodes a chicken homolog of the inhibitor-of-apoptosis protein ( IAP) family. ch-IAP1 contains N-terminal baculovirus IAP repeats (BIR), the hallmark of IAPs, and has a C-terminal RING finger motif commonly present in the other IAPs. Like other IAPs, ch-IAP1 is expressed predominantly in the cytoplasm of cells. ch-IAP1 is highly expressed in v-Rel transformed fibroblasts, B- and T-cell lines, and spleen cell lines. In contrast, ch-IAP1 expression levels were low in chicken cell lines transformed by several other unrelated tumor viruses. Additionally, ch-IAP1 expression is downregulated in temperature-sensitive (ts) v-Rel transformed spleen cells at the nonpermissive temperature. Overexpression of the full-length ch-IAP1 suppresses mammalian cell apoptosis induced by the interleukin-1-converting enzyme (ICE), a member of the mammalian caspase family of cysteine proteases. Furthermore, expression of exogenous ch-IAP1 inhibits apoptosis of ts v-Rel transformed spleen cells at the nonpermissive temperature.[1]


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