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Table 3 Linear regressions of GC content of introns on coding sequences of the same gene for each species.a

From: Codon usage in twelve species of Drosophila

  Coefb p-valuec Rsqd Ne
mel 0.2460 2.52e-31 0.0412 3221
sim 0.1290 2.14e-07 0.0114 2344
sec 0.1570 1.62e-10 0.0169 2399
yak 0.1870 1.22e-13 0.0221 2463
ere 0.2460 1.86e-21 0.0364 2444
ana 0.2700 4.03e-26 0.0497 2195
pse 0.4140 9.82e-32 0.0708 1875
per 0.4210 1.05e-36 0.0802 1919
wil 0.2210 1.02e-21 0.0426 2109
vir 0.1780 3.58e-10 0.0160 2447
moj 0.1140 3.92e-05 0.0071 2374
gri 0.0588 2.42e-03 0.0034 2706
  1. aGC content in coding sequences was calculated from the 3rd codon positions of 2- and 4-fold redundant amino acids.
  2. bMultiplier coefficient of the linear model.
  3. cThe probability that the true coefficient value is different from zero.
  4. dThe fraction of total variability explained by the model.
  5. eThe number of genes used. Genes were chosen with the following criteria: from the homologous set we chose only genes that had at least one intron between 100 and 2000 bp in length after cleaning, and with at least 100 codons in the coding sequence.