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- W2193079980 abstract "Imprecise excision of the Caenorhabditis elegans transposon Tc1 from a specific site of insertion within the unc-54 myosin heavy chain gene generates either wild-type or partial phenotypic revertants. Wild-type revertants and one class of partial revertants contain insertions of four nucleotides in the unc-54 third exon (Tc1 footprints). Such revertants express large amounts of functional unc-54 myosin despite having what would appear to be frameshifting insertions in the unc-54 third exon. We demonstrate that these Tc1 footprints act as efficient 5' splice sites for removal of the unc-54 third intron. Splicing of these new 5' splice sites to the normal third intron splice acceptor removes the Tc1 footprint from the mature mRNA and restores the normal translational reading frame. Partial revertant unc-54(r661), which contains a single nucleotide substitution relative to the wild-type gene, is spliced similarly, except that the use of its new 5' splice site creates a frameshift in the mature mRNA rather than removing one. In all of these revertants, two alternative 5' splice sites are available to remove intron 3. We determined the relative efficiency with which each alternative 5' splice site is used by stabilizing frameshifted mRNAs with smg(-) genetic backgrounds. In all cases, the upstream member of the two alternative sites is used preferentially (> 75% utilization). This may reflect an inherent preference of the splicing machinery for the upstream member of two closely spaced 5' splice sites. Creation of new 5' splice sites may be a general characteristic of Tc1 insertion and excision events." @default.
- W2193079980 created "2016-06-24" @default.
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- W2193079980 creator A5037348558 @default.
- W2193079980 date "1994-05-01" @default.
- W2193079980 modified "2023-09-26" @default.
- W2193079980 title "Imprecise excision of the Caenorhabditis elegans transposon Tc1 creates functional 5' splice sites" @default.
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- W2193079980 doi "https://doi.org/10.1128/mcb.14.5.3426-3433.1994" @default.
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