Abstract
We report a new mechanism of aberrant pre-mRNA splicing resulting in constitutive activation of a mis-spliced oncoprotein (KIT) leading to malignancy (gastrointestinal stromal tumor) in contrast to loss of function of mis-spliced proteins resulting in diverse human diseases in the literature. The mechanisms of three consecutive molecular events, deletion of noncoding and coding regions encompassing the 3′ authentic splice site, creation of a novel intra-exonic pre-mRNA 3′ splice acceptor site leading to in-frame loss of 27 nucleotides (nine amino acids; Lys550–Lys558), and the mechanism of constitutive activation of the mis-spliced KIT are elucidated. Loss of a peptide in a critical location unleashed the protein from autoinhibition (as evidenced by three-dimensional structural analysis), causing KIT to become constitutively activated and resulting in the GIST phenotype. We also demonstrated that only one of the following two exonic splicing enhancers is sufficient for inclusion of the KIT exon 11 in vivo: AACCCATGT (nucleotides 2–10 from the 5′ end, which are recognized by SC35, SRp55, and SF2/ASF) or GGTTGTTGAGG (nucleotides 27–37 from the 5′ end, which are recognized by SC35 and SRp55), suggestive of exonic enhancer redundancy.
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Acknowledgements
We thank WK Hong and RS Benjamin for divisional and departmental support, HL Evans for assistance in pathology, LJ Corley, P Zhang, and MA Velasco for laboratory assistance, LA Gratten for manuscript preparation, and TA Simmons for clinical data preparation. MS was supported in part by cancer prevention fellowships funded by National Cancer Institute Grant R25 CA57730 (principal investigator RM Chamberlain). This work was supported by funds from an Institutional Research Grant from the University of Texas MD Anderson Cancer Center, National Cancer Institute grants CA16672 (supporting the DNA sequencing core facility, nucleic acid core facility, and tissue procurement and banking facility), U01-CA70172-01, N0-CM-17003, and the Goodwin Foundation.
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The authors declare that they have no competing financial interests.
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Chen, L., Sabripour, M., Wu, E. et al. A mutation-created novel intra-exonic pre-mRNA splice site causes constitutive activation of KIT in human gastrointestinal stromal tumors. Oncogene 24, 4271–4280 (2005). https://doi.org/10.1038/sj.onc.1208587
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DOI: https://doi.org/10.1038/sj.onc.1208587
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