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Differential subcellular localization of functionally divergent survivin splice variants
C Mahotka1, J Liebmann, M Wenzel
1Institute of Pathology, Heinrich Heine-University, Duesseldorf, Germany.
Cell Death and Differentiation
|December 13, 2002
Summary
Survivin, a cancer-overexpressed protein, has distinct variants with unique cellular locations. These survivin isoforms, including survivin-2B and survivin-deltaEx3, may have different functions based on their subcellular distribution.
Area of Science:
- Molecular Biology
- Cell Biology
- Cancer Research
Background:
- Survivin is an inhibitor of apoptosis protein (IAP) overexpressed in many cancers.
- Two novel splice variants, survivin-2B (non-antiapoptotic) and survivin-deltaEx3 (antiapoptotic), were identified.
Purpose of the Study:
- To analyze the subcellular distribution of survivin and its novel variants.
- To investigate potential functional divergence based on localization.
Main Methods:
- PSORT II bioinformatic analysis for subcellular localization prediction.
- Expression of GFP-tagged survivin variants in cells.
- Confocal microscopy to observe localization and cell cycle dependence.
Main Results:
- Survivin and survivin-2B predicted for cytoplasmic localization; survivin-deltaEx3 for nuclear localization.
- GFP-tagged variants confirmed predicted localizations.
- Survivin-deltaEx3 showed cell cycle-dependent nuclear accumulation, potentially due to a bipartite nuclear localization signal.
- Survivin-deltaEx3 and survivin-2B did not co-localize with microtubules or centromeres during mitosis.
Conclusions:
- Differential subcellular localization exists for functionally divergent survivin variants.
- Survivin isoforms may perform distinct functions in specific cellular compartments and cell cycle phases.