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Table 1 Transcript alignments, intron and exon features in plants

From: Cross-species EST alignments reveal novel and conserved alternative splicing events in legumes

  Medicago Lotus# Arabidopsis Rice
EST/cDNA total 225,920 150,855 691,516 1,009,754
Mapped to genome^ 104,382 (46.2%) 22,144 (14.7%)* 589,254 (85.2%) 916,825 (90.8%)
Transcription unit (TU)/Genes 11,516 3,298 22,518 31,044
MultiEST TU/Genes 8,544 (74.2%) 1,879 (57.0%) 19,857 (88.2%) 26,859 (86.5%)
Average (Median) ESTs/gene 9.8 (4) 6.9 (2) 26.3 (11) 30.1 (10)
Number of Introns 32,860 4,357 97,095 107,162
Average (Median) intron size 472 (218) 458 (215) 171 (101) 438 (164)
Long intron (>1000 nt) 12.7% 10.9% 0.7% 10.7%
Number of internal exons 24,600 2,717 78,911 83,668
Average (Median) internal exon 140 (108) 127 (100) 164 (114) 175 (113)
  1. ^ Transcript sequences are required to have >95% identity and >80% coverage to be considered as mapped.
  2. # Lotus data are based on the ESTs aligned to finished TACs (phase 3).
  3. * A total of 48,691 (32.3% of 150,855) transcript sequences can be mapped to Lj TACs in all phases, including phase 1, phase 2 and phase 3.