Words similar to rrnas
Example sentences for: rrnas
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To understand the association of introns with highly conserved regions in the rRNAs, we mapped the intron positions on SSU and LSU rRNA conservation diagrams of the three phylogenetic domains of life and the two eukaryotic organelles (3Dom2O) and the nuclear-encoded rRNA genes in the three phylogenetic domains (3Dom).
With our data set of 49 (two diatom-specific introns were excluded from this analysis) different spliceosomal intron sites in the SSU and LSU rRNAs of Euascomycetes (alignment available at http://www.rna.icmb.utexas.edu/ANALYSIS/FUNGINT/(for registration details please see http://www.rnq.icmb.utexas.edu/cgi-access/access/locked.cgi), we first tested for the presence of a proto-splice site flanking the introns [ 12 ] . In this chi-square analysis, the null hypothesis specified that nucleotide usage in 50 nt of exon sequence upstream and downstream of the different intron insertion sites was random and dependent on the nucleotide composition of Euascomycetes SSU and LSU rRNA sequences in general.
The observed numbers of sequences exceed the expected values for all but one category: fewer rRNAs contain only one intron than expected.
More importantly, inspection of the 1800 nt alignment of SSU rRNAs and 3554 nt of LSU rRNAs of all fungi, of fungi containing spliceosomal introns, and of fungi lacking spliceosomal introns shows that most of the introns are inserted between nucleotides that are 99-100% conserved (whether they encode G - G or not) in taxa containing introns and sister groups lacking introns (Table 2).
The introns that occur in 16S and 23S rRNAs are organized into four preconfigured online tables.
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