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This study strongly support the introns-late hypothesis of the origin of spliceosomal …

Biology Articles » Evolutionary Biology » Molecular Evolution » Phase distribution of spliceosomal introns: implications for intron origin » Tables

Tables
- Phase distribution of spliceosomal introns: implications for intron origin

Table 1 Statistical information of the genome-wide dataset.
Organism
 # of genes
 # of introns
 Avg. introns
 %GC
 Phase distribution (%)










P-0
 P-1
 P-2
N. crassa
 8817
 15856
 1.80
 56.0
 38.2
 34.1
 27.7
D. melanogaster
 8932
 27135
 3.04
 53.7
 42.5
 31.8
 25.7
H. sapiens
 11058
 89508
 8.09
 52.3
 45.4
 31.2
 23.4
F. graminearum
 8168
 18695
 2.29
 51.8
 38.6
 34.4
 27.0
C. neoformans
 5603
 26945
 4.81
 51.0
 41.6
 30.7
 27.7
X. tropicalis
 7793
 61999
 7.96
 47.2
 46.7
 30.3
 23.0
A. thaliana
 9734
 52856
 5.43
 44.1
 57.6
 20.6
 21.8
C. elegans
 11128
 60110
 5.40
 43.1
 47.8
 26.5
 25.7
S. pombe
 3791
 3924
 1.04
 39.4
 42.2
 31.2
 26.6
P. falciparum
 3828
 6127
 1.60
 23.6
 44.8
 32.6
 22.6
The 10 eukaryotes are arranged in descending order of GC contents (%) from top to bottom. P-0, phase-0; P-1, phase-1; P-2, phase-2.
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Table 2 Prediction of intron phase distributions using the all-pattern intron insertion model and mutation correction. Organism Best mrate Best %GC Phase distribution (%) Error σ P-0 P-1 P-2 N. crassa -0.004 55.9 38.2 34.2 27.6 0.08* 0.001 D. melanogaster -0.011 53.5 42.8 32.6 24.6 19.58 0.055 H. sapiens +0.178 55.0 45.4 31.1 23.5 0.27* 0.066 F. graminearum +0.163 54.3 38.7 34.7 26.6 1.75* 0.024 C. neoformans +0.503 59.9 41.7 31.1 27.2 4.09* 0.125 X. tropicalis +0.279 52.3 46.7 30.1 23.2 1.41* 0.138 A. thaliana +0.632 57.6 57.5 20.7 21.8 0.69* 0.147 C. elegans +0.539 54.6 48.6 28.4 23.0 274.98 2.260 S. pombe +0.406 49.2 42.3 33.3 24.4 13.39 0.099 P. falciparum +0.390 34.7 42.3 30.9 26.8 56.88 0.347 "Best mrate" shows the best mutation rate. "Best %GC", "phase distribution (%)", and "error" are averages of 20 simulations for mutation correction at the best mutation rate. Error is measured as the χ2 value between the observed and predicted intron phase distributions. "σ" shows the standard deviation of error in 20 simulations. P-0, phase-0; P-1, phase-1; P-2, phase-2.* Not significant at the P
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Source: BMC Evolutionary Biology 2006, 6:69 
© 2006 Nguyen et al; licensee BioMed Central Ltd.

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