alexa Survivin 2alpha: a novel Survivin splice variant expressed in human malignancies.
Immunology

Immunology

Journal of Vaccines & Vaccination

Author(s): Caldas H, Honsey LE, Altura RA

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Abstract BACKGROUND: Survivin and its alternative splice forms are involved in critical cellular processes, including cell division and programmed cell death. Survivin is expressed in the majority of human cancers, but minimally in differentiated normal tissues. Expression levels correlate with tumor aggressiveness and resistance to therapy. RESULTS: In the present study, we identify and characterize a novel survivin isoform that we designate survivin 2alpha. Structurally, the transcript consists of 2 exons: exon 1 and exon 2, as well as a 3' 197 bp region of intron 2. Acquisition of a new in-frame stop codon within intron 2 results in an open reading frame of 225 nucleotides, predicting a truncated 74 amino acid protein. Survivin 2alpha is expressed at high levels in several malignant cell lines and primary tumors. Functional assays show that survivin 2alpha attenuates the anti-apoptotic activity of survivin. Subcellular localization and immunoprecipitation of survivin 2alpha suggests a physical interaction with survivin. CONCLUSION: We characterized a novel survivin splice variant that we designated survivin 2alpha. We hypothesize that survivin 2alpha can alter the anti-apoptotic functions of survivin in malignant cells. Thus survivin 2alpha may be useful as a therapeutic tool in sensitizing chemoresistant tumor cells to chemotherapy.
This article was published in Mol Cancer and referenced in Journal of Vaccines & Vaccination

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