Nucleic Acids Research, Vol 27, Issue 3 888-894, Copyright © 1999 by Oxford University Press
JH Graber, CR Cantor, SC Mohr and TF Smith
To investigate Saccharomyces cerevisiae 3'-end-processing signals, a set of
1352 unique pre-mRNA 3'-end-processing sites, corresponding to 861
different genes, was identified by alignment of expressed sequence tag
sequences with the complete yeast genome. Nucleotide word frequencies in
the vicinity of the cleavage sites were analyzed to reveal the signal
element features. In addition to previously recognized processing signals,
two previously uncharacterized components of the 3'-end-processing signal
sequence were discovered, specifically a predominance of U-rich sequences
located on either side of the cleavage site. One of these, the downstream
U-rich signal, provides a further link between the 3'-end-processing
mechanisms of yeast and higher eukaryotes. Analysis of the complete set of
3'-end- processing sites by means of a discrimination function supports a
'contextual' model in which the sum total effectiveness of the signals in
all four elements determines whether or not processing occurs.
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Genomic detection of new yeast pre-mRNA 3'-end-processing signals
Center for Advanced Biotechnology, Boston University, 36 Cummington Street, Boston, MA 02215, USA. jhg@darwin.bu.edu
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