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Table 2 Summary statistics for TIGR Arabidopsis annotation releases.

From: Complete reannotation of the Arabidopsis genome: methods, tools, protocols and the final release

  Nature (12/00) Release 1 (8/01) Release 2 (1/02) Release 3 (8/02) Release 4 (4/03) Release 5 (1/04)
Genome size (Mb) 115.410 116.238 117.227 117.077 119.055 118.998
protein-coding genes 25,498 25,554 26,156 27,117 27,170 26,207
transposons and pseudogenes NA 1,274 1,305 1,967 2,218 3,786
Genes annotated as alternatively spliced NA 0 28 162 1,267 2,330
genes with UTRs NA 4,140 10,219 11,691 17,060 18,099
Protein-coding genes similar to transposon ORFsa NA 487 485 528 531 6
gene density (kb per gene) 4.5 4.55 4.48 4.32 4.38 4.54
exons / gene 5.2 5.23 5.25 5.24 5.31 5.42
average exon length (bp) 250 256 265 266 279 276
average intron length (bp) 168 168 167 166 166 164
Gene structures altered since previous release.
(u,a,d,m,s)
NA - u: 2,853
a: 690
d: 231
m: 14
s: 167
u:1,366
a: 1,906
d: 221
m: 62
s: 14
u: 2,347
a: 527
d: 143
m: 153
s: 24
u: 2,858
a: 1,393
d: 730
m: 169
s: 28
  1. Gene structure modifications from each previous release are represented by u: updated, a: added, d: deleted, m: merged, and s: split. aAnnotated protein-coding genes with a BLASTP match containing an E-value <= 1e-20.