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Table 2 Frequencies of Fungal Nucleotides at Sites of Spliceosomal Intron Insertion

From: The exon context and distribution of Euascomycetes rRNA spliceosomal introns

Intron Position     Insertion Site     
Ec Sc All + Int - Int 5'-nt 3'-nt All + Int - Int # Int
265 336 99.8 100.0 99.8 G G 95.0 85.7 95.3 4
297 369 65.3 97.8 63.9 U A 100.0 100.0 99.5 5
298 370 100.0 100.0 99.5 A G 100.0 100.0 100.0 2
299 371 100.0 100.0 100.0 G G 99.8 100.0 99.8 12
300 372 99.8 100.0 99.8 G G 99.7 100.0 99.6 1
330 402 99.1 100.0 99.1 C G 99.5 100.0 99.4 15
331 403 99.5 100.0 99.4 G G 99.7 100.0 99.7 8
332 404 99.7 100.0 99.7 G C 99.6 100.0 99.6 1
333 405 99.6 100.0 99.6 C U 91.5 100.0 91.1 1
337 409 76.7 87.0 76.3 C A 99.8 100.0 99.8 1
390 461 99.3 97.5 99.4 G G 93.1 100.0 92.9 2
393 464 99.6 100.0 99.6 A G 99.6 100.0 99.5 10
400 471 99.6 100.0 99.6 A U 97.6 95.0 97.7 1
514 561 99.5 100.0 99.4 G G 99.5 100.0 99.4 1
674 885 99.7 100.0 99.7 G U 99.8 100.0 99.8 4
882 1106 67.3 75.8 67.0 U G 80.5 84.9 80.3 1
883 1107 80.5 84.9 80.3 G G 99.4 100.0 99.4 6
939 1164 99.2 97.1 99.3 G G 98.7 97.1 98.8 8
1057 1277 99.8 100.0 99.8 G G 98.8 100.0 98.7 1
1071 1291 93.4 100.0 93.3 G G 99.4 100.0 99.4 1
1083 1303 99.5 100.0 99.5 U G 99.6 100.0 99.6 1
1226 1459 99.1 100.0 99.1 C A 99.8 100.0 99.8 2
1229 1462 99.7 100.0 99.7 G C 99.4 100.0 99.3 8
1514 1777 98.6 100.0 98.5 G G 91.1 100.0 90.9 2
678 967 99.9 100.0 99.9 G A 99.9 97.0 100.0 16
681 970 99.7 97.0 99.9 G G 98.1 93.9 98.3 1
711 1000 99.6 97.0 99.7 G A 98.2 81.8 99.0 3
775 1065 99.8 100.0 99.8 G G 100.0 100.0 100.0 1
776 1066 100.0 100.0 100.0 G G 100.0 100.0 100.0 5
777 1067 100.0 100.0 100.0 G G 100.0 100.0 100.0 1
780 1070 100.0 100.0 100.0 G A 100.0 100.0 100.0 1
783 1073 100.0 100.0 100.0 A G 100.0 100.0 100.0 2
784 1074 100.0 100.0 100.0 G A 100.0 100.0 100.0 3
786 1076 99.8 100.0 99.8 C U 95.8 91.2 96.1 1
787 1077 95.8 91.2 96.1 U A 98.7 91.2 99.1 1
824 1114 100.0 100.0 100.0 U C 100.0 100.0 100.0 1
830 1120 99.8 100.0 99.8 A G 99.8 100.0 99.8 1
858 1151 100.0 100.0 100.0 G G 100.0 100.0 100.0 2
978 1306 99.3 95.7 99.6 G G 100.0 100.0 100.0 3
1024 1351 98.6 100.0 98.5 A G 99.3 100.0 99.3 1
1054 1387 97.6 100.0 97.4 G G 100.0 100.0 100.0 4
1091 1424 100.0 100.0 100.0 G U 99.3 100.0 99.2 1
1093 1426 100.0 100.0 100.0 G U 100.0 100.0 100.0 1
1098 1431 100.0 100.0 100.0 A A 99.3 100.0 99.2 1
1849 2367 100.0 100.0 100.0 U G 100.0 100.0 100.0 1
1903 2404 97.3 100.0 97.1 G G 100.0 100.0 100.0 1
1929 2430 97.3 100.0 97.1 G G 97.3 100.0 97.1 1
2076 2576 100.0 100.0 100.0 G A 100.0 100.0 100.0 1
2445 2972 100.0 100.0 100.0 G G 100.0 100.0 100.0 1
  1. Column headings: Intron Position, the sites of spliceosomal intron insertion in the SSU and LSU (below the broken line) rRNA genes. The homologous intron sites in the Escherichia coli (Ec, GenBank #J01695) and Saccharomyces cerevisiae (Sc, GenBank #U53879) genes are shown. The 5' and 3' nucleotides (5'-nt, 3'-nt) flanking the intron insertion sites (Insertion Site), the frequency of these nucleotides in the alignment of all fungal SSU and LSU rRNAs (All, 1434 and 880 sequences, respectively), of fungi containing spliceosomal introns (+ Int, 73 and 40 sequences, respectively), and of fungi lacking spliceosomal introns (- Int, 1361 and 840 sequences, respectively), and the number of taxa containing introns at each site (# Int) are shown.