Abstract
Caspases have been shown to play important roles in apoptotic cell death, cytokine maturation and cell differentiation. However, the transcriptional regulation of the corresponding CASP genes remains poorly known. We describe a 5.1 kb fragment located upstream of the first translated exon in the human CASP-2 gene, which is known to encode caspase-2L and -2S protein isoforms. Transient transfection experiments, together with transcription start site mapping and transcript analysis, demonstrate that each caspase mRNA is initiated from separate promoter regions, and produced from alternative splicing events in these regions. The CASP-2L promoter is much stronger than the CASP-2S promoter, in good agreement with the respective transcript levels of the two caspases. In addition, several in-frame translational start sites can be identified for each isoform, one of which is common to both, present in the second common exon, and used efficiently. Surprisingly, the short isoform may also be initiated at a downstream AUG codon within the same exon. Thus, promoter strength, alternative transcriptional initiation and 5′-splicing events regulate the expression of the main caspase-2 isoforms that may be translated from alternative translation initiation codons.
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Acknowledgements
We thank members from the Inserm U517 for numerous encouraging discussions. E Logette and S Solier were recipients at fellowships from the French Ministry of Research and Technology and from the Medical Research Foundation, respectively. This work was supported by grants from the Inserm, the Ligue Nationale Française de la Recherche Centre le Cancer and the Conseil Regional de Bourgogne.
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Logette, E., Wotawa, A., Solier, S. et al. The human caspase-2 gene: alternative promoters, pre-mRNA splicing and AUG usage direct isoform-specific expression. Oncogene 22, 935–946 (2003). https://doi.org/10.1038/sj.onc.1206172
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DOI: https://doi.org/10.1038/sj.onc.1206172
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