By planned and prepared under the direction of Carroll E. Wood, Jr., assisted by Elizabeth A. Shaw ; with the technical help of Karen S. Velmure and Kenneth R. Robertson.
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Extra info for A student's atlas of flowering plants : some dicotyledons of eastern North America
The processing of some introns may be mediated by ex on definition, others by intron 20 definition, while the first and terminal introns via spliceosomal interactions with the 5' cap-binding complex and polyadenylation machinery respectively. There is then, co-operativity between multiple cis elements that combine to determine processing. It is also clear that the processing of some introns is more dramatically affected by mutation of particular cis-acting elements than others, indicating that the compensatory effect of other elements is greater.
However, since higher-plant introns are typically much shorter than vertebrate introns and possess AUrich sequence required for splicing throughout their entire length, ex on definition may not be necessary, but rather, the intron, as others have speculated , may be the unit of definition [discussed in 12]. If so, it could point to a fundamental difference between plants and mammals. However, the many lines of relatedness between higher-plant and mammalian pre-mRNA splicing means that exon definition should not be quickly dismissed.
The best documented and also biologically relevant case of differential splicing in plants is the processing of RNA transcribed from the transposable element EmlSpm [76, 152]. 3 kb long EmlSpm transcript undergo alternative processing to yield mRNAs encoding TnpA and TnpD, the two proteins required for transposition. 4 kb of the transcript is removed as an intron. Notably, this same long intron contains two open reading frames, ORFI and ORF2, and both of them are included in the much less abundant tnpD RNA.
A student's atlas of flowering plants : some dicotyledons of eastern North America by planned and prepared under the direction of Carroll E. Wood, Jr., assisted by Elizabeth A. Shaw ; with the technical help of Karen S. Velmure and Kenneth R. Robertson.